Robust/src/Runtime/DSTM/interface/trans.c

   1 #include "dstm.h"
   2 #include "ip.h"
   3 #include "clookup.h"
   4 #include "machinepile.h"
   5 #include "mlookup.h"
   6 #include "llookup.h"
   7 #include "plookup.h"
   8 #include "prelookup.h"
   9 #include "threadnotify.h"
  10 #include "queue.h"
  11 #ifdef COMPILER
  12 #include "thread.h"
  13 #endif
  14
  15 #define NUM_THREADS 1
  16 #define PREFETCH_CACHE_SIZE 1048576 //1MB
  17 #define CONFIG_FILENAME "dstm.conf"
  18
  19 /* Global Variables */
  20 extern int classsize[];
  21 extern primarypfq_t pqueue; //Shared prefetch queue
  22 objstr_t *prefetchcache; //Global Prefetch cache
  23 pthread_mutex_t prefetchcache_mutex;// Mutex to lock Prefetch Cache
  24 pthread_mutexattr_t prefetchcache_mutex_attr; /* Attribute for lock to make it a recursive lock */
  25 extern pthread_mutex_t mainobjstore_mutex;// Mutex to lock main Object store
  26 extern prehashtable_t pflookup; //Global Prefetch cache's lookup table
  27 pthread_t wthreads[NUM_THREADS]; //Worker threads for working on the prefetch queue
  28 pthread_t tPrefetch;            /* Primary Prefetch thread that processes the prefetch queue */
  29 extern objstr_t *mainobjstore;
  30 unsigned int myIpAddr;
  31 unsigned int *hostIpAddrs;
  32 int sizeOfHostArray;
  33 int numHostsInSystem;
  34 int myIndexInHostArray;
  35 unsigned int oidsPerBlock;
  36 unsigned int oidMin;
  37 unsigned int oidMax;
  38
  39 sockPoolHashTable_t *transReadSockPool;
  40 sockPoolHashTable_t *transPrefetchSockPool;
  41
  42 void printhex(unsigned char *, int);
  43 plistnode_t *createPiles(transrecord_t *);
  44
  45 /*******************************
  46  * Send and Recv function calls
  47  *******************************/
  48 void send_data(int fd , void *buf, int buflen) {
  49         char *buffer = (char *)(buf);
  50         int size = buflen;
  51         int numbytes;
  52         while (size > 0) {
  53                 numbytes = send(fd, buffer, size, MSG_NOSIGNAL);
  54                 if (numbytes == -1) {
  55                         perror("send");
  56                         exit(-1);
  57                 }
  58                 buffer += numbytes;
  59                 size -= numbytes;
  60         }
  61 }
  62
  63 void recv_data(int fd , void *buf, int buflen) {
  64         char *buffer = (char *)(buf);
  65         int size = buflen;
  66         int numbytes;
  67         while (size > 0) {
  68                 numbytes = recv(fd, buffer, size, 0);
  69                 if (numbytes == -1) {
  70                         perror("recv");
  71                         exit(-1);
  72                 }
  73                 buffer += numbytes;
  74                 size -= numbytes;
  75         }
  76 }
  77
  78 int recv_data_errorcode(int fd , void *buf, int buflen) {
  79   char *buffer = (char *)(buf);
  80   int size = buflen;
  81   int numbytes;
  82   while (size > 0) {
  83     numbytes = recv(fd, buffer, size, 0);
  84     if (numbytes == -1) {
  85       return -1;
  86     }
  87     buffer += numbytes;
  88     size -= numbytes;
  89   }
  90   return 0;
  91 }
  92
  93 void printhex(unsigned char *ptr, int numBytes)
  94 {
  95         int i;
  96         for (i = 0; i < numBytes; i++)
  97         {
  98                 if (ptr[i] < 16)
  99                         printf("0%x ", ptr[i]);
 100                 else
 101                         printf("%x ", ptr[i]);
 102         }
 103         printf("\n");
 104         return;
 105 }
 106
 107 inline int arrayLength(int *array) {
 108         int i;
 109         for(i=0 ;array[i] != -1; i++)
 110                 ;
 111         return i;
 112 }
 113 inline int findmax(int *array, int arraylength) {
 114         int max, i;
 115         max = array[0];
 116         for(i = 0; i < arraylength; i++){
 117                 if(array[i] > max) {
 118                         max = array[i];
 119                 }
 120         }
 121         return max;
 122 }
 123 /* This function is a prefetch call generated by the compiler that
 124  * populates the shared primary prefetch queue*/
 125 void prefetch(int ntuples, unsigned int *oids, unsigned short *endoffsets, short *arrayfields) {
 126   /* Allocate for the queue node*/
 127   if(ntuples > 0) {
 128     int qnodesize = sizeof(prefetchqelem_t) + sizeof(int) + ntuples * (sizeof(unsigned short) + sizeof(unsigned int)) + endoffsets[ntuples - 1] * sizeof(short);
 129     char * node;
 130
 131     if((node = calloc(1, qnodesize)) == NULL) {
 132       printf("Calloc Error %s, %d\n", __FILE__, __LINE__);
 133       return;
 134     } else {
 135       /* Set queue node values */
 136       int len = sizeof(prefetchqelem_t);
 137       int i;
 138       unsigned int *narray;
 139       unsigned short *narray2;
 140       short * narray3;
 141       int top=endoffsets[ntuples-1];
 142       *((int *)(node+len))=ntuples;
 143       len += sizeof(int);
 144       narray=(unsigned int *)(node+len);
 145       narray2=(unsigned short *)(narray+ntuples);
 146       narray3=(short *)(narray2+ntuples);
 147
 148       for(i=0;i<ntuples;i++) {
 149         narray[i]=oids[i];
 150         narray2[i]=endoffsets[i];
 151       }
 152       for(i=0;i<top;i++) {
 153         narray3[i]=arrayfields[i];
 154       }
 155       /* Lock and insert into primary prefetch queue */
 156       pthread_mutex_lock(&pqueue.qlock);
 157       pre_enqueue((prefetchqelem_t *)node);
 158       pthread_cond_signal(&pqueue.qcond);
 159       pthread_mutex_unlock(&pqueue.qlock);
 160     }
 161   }
 162 }
 163
 164 /* This function starts up the transaction runtime. */
 165 int dstmStartup(const char * option) {
 166   pthread_t thread_Listen;
 167   pthread_attr_t attr;
 168   int master=option!=NULL && strcmp(option, "master")==0;
 169
 170   if (processConfigFile() != 0)
 171     return 0; //TODO: return error value, cause main program to exit
 172 #ifdef COMPILER
 173   if (!master)
 174     threadcount--;
 175 #endif
 176
 177   //Initialize socket pool
 178   transReadSockPool = createSockPool(transReadSockPool, 2*numHostsInSystem+1);
 179   transPrefetchSockPool = createSockPool(transPrefetchSockPool, 2*numHostsInSystem+1);
 180
 181   dstmInit();
 182   transInit();
 183
 184   if (master) {
 185     pthread_attr_init(&attr);
 186     pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 187     pthread_create(&thread_Listen, &attr, dstmListen, NULL);
 188     return 1;
 189   } else {
 190     dstmListen();
 191     return 0;
 192   }
 193 }
 194
 195 //TODO Use this later
 196 void *pCacheAlloc(objstr_t *store, unsigned int size) {
 197         void *tmp;
 198         objstr_t *ptr;
 199         ptr = store;
 200         int success = 0;
 201
 202         while(ptr->next != NULL) {
 203                 /* check if store is empty */
 204                 if(((unsigned int)ptr->top - (unsigned int)ptr - sizeof(objstr_t) + size) <= ptr->size) {
 205                         tmp = ptr->top;
 206                         ptr->top += size;
 207                         success = 1;
 208                         return tmp;
 209                 } else {
 210                         ptr = ptr-> next;
 211                 }
 212         }
 213
 214         if(success == 0) {
 215                 return NULL;
 216         }
 217 }
 218
 219 /* This function initiates the prefetch thread
 220  * A queue is shared between the main thread of execution
 221  * and the prefetch thread to process the prefetch call
 222  * Call from compiler populates the shared queue with prefetch requests while prefetch thread
 223  * processes the prefetch requests */
 224 void transInit() {
 225         int t, rc;
 226         int retval;
 227         //Create and initialize prefetch cache structure
 228         prefetchcache = objstrCreate(PREFETCH_CACHE_SIZE);
 229         //prefetchcache->next = objstrCreate(PREFETCH_CACHE_SIZE);
 230         //prefetchcache->next->next = objstrCreate(PREFETCH_CACHE_SIZE);
 231
 232         /* Initialize attributes for mutex */
 233         pthread_mutexattr_init(&prefetchcache_mutex_attr);
 234         pthread_mutexattr_settype(&prefetchcache_mutex_attr, PTHREAD_MUTEX_RECURSIVE_NP);
 235
 236         pthread_mutex_init(&prefetchcache_mutex, &prefetchcache_mutex_attr);
 237
 238         //Create prefetch cache lookup table
 239         if(prehashCreate(HASH_SIZE, LOADFACTOR))
 240                 return; //Failure
 241
 242         //Initialize primary shared queue
 243         queueInit();
 244         //Initialize machine pile w/prefetch oids and offsets shared queue
 245         mcpileqInit();
 246
 247         //Create the primary prefetch thread
 248         do {
 249           retval=pthread_create(&tPrefetch, NULL, transPrefetch, NULL);
 250         } while(retval!=0);
 251         pthread_detach(tPrefetch);
 252 }
 253
 254 /* This function stops the threads spawned */
 255 void transExit() {
 256         int t;
 257         pthread_cancel(tPrefetch);
 258         for(t = 0; t < NUM_THREADS; t++)
 259                 pthread_cancel(wthreads[t]);
 260
 261         return;
 262 }
 263
 264 /* This functions inserts randowm wait delays in the order of msec
 265  * Mostly used when transaction commits retry*/
 266 void randomdelay()
 267 {
 268         struct timespec req;
 269         time_t t;
 270
 271         t = time(NULL);
 272         req.tv_sec = 0;
 273         req.tv_nsec = (long)(1000000 + (t%10000000)); //1-11 msec
 274         nanosleep(&req, NULL);
 275         return;
 276 }
 277
 278 /* This function initializes things required in the transaction start*/
 279 transrecord_t *transStart()
 280 {
 281         transrecord_t *tmp = calloc(1, sizeof(transrecord_t));
 282         tmp->cache = objstrCreate(1048576);
 283         tmp->lookupTable = chashCreate(HASH_SIZE, LOADFACTOR);
 284 #ifdef COMPILER
 285         tmp->revertlist=NULL;
 286 #endif
 287         return tmp;
 288 }
 289
 290 /* This function finds the location of the objects involved in a transaction
 291  * and returns the pointer to the object if found in a remote location */
 292 objheader_t *transRead(transrecord_t *record, unsigned int oid) {
 293   unsigned int machinenumber;
 294   objheader_t *tmp, *objheader;
 295   objheader_t *objcopy;
 296   int size, found = 0;
 297   void *buf;
 298
 299   if(oid == 0) {
 300     printf("Error: %s, %d oid is NULL \n", __FILE__, __LINE__);
 301     return NULL;
 302   }
 303
 304   /* Search local transaction cache */
 305   if((objheader = (objheader_t *)chashSearch(record->lookupTable, oid)) != NULL){
 306 #ifdef COMPILER
 307     return &objheader[1];
 308 #else
 309     return objheader;
 310 #endif
 311   } else if ((objheader = (objheader_t *) mhashSearch(oid)) != NULL) {
 312     /* Look up in machine lookup table  and copy  into cache*/
 313     GETSIZE(size, objheader);
 314     size += sizeof(objheader_t);
 315     objcopy = (objheader_t *) objstrAlloc(record->cache, size);
 316     memcpy(objcopy, objheader, size);
 317     /* Insert into cache's lookup table */
 318     chashInsert(record->lookupTable, OID(objheader), objcopy);
 319 #ifdef COMPILER
 320     return &objcopy[1];
 321 #else
 322     return objcopy;
 323 #endif
 324   } else if((tmp = (objheader_t *) prehashSearch(oid)) != NULL) { /* Look up in prefetch cache */
 325     GETSIZE(size, tmp);
 326     size+=sizeof(objheader_t);
 327     objcopy = (objheader_t *) objstrAlloc(record->cache, size);
 328     memcpy(objcopy, tmp, size);
 329     /* Insert into cache's lookup table */
 330     chashInsert(record->lookupTable, OID(tmp), objcopy);
 331 #ifdef COMPILER
 332     return &objcopy[1];
 333 #else
 334     return objcopy;
 335 #endif
 336   } else {
 337     /* Get the object from the remote location */
 338     if((machinenumber = lhashSearch(oid)) == 0) {
 339       printf("Error: %s() No machine found for oid =% %s,%dx\n",__func__, machinenumber, __FILE__, __LINE__);
 340       return NULL;
 341     }
 342     objcopy = getRemoteObj(record, machinenumber, oid);
 343
 344     if(objcopy == NULL) {
 345       printf("Error: Object not found in Remote location %s, %d\n", __FILE__, __LINE__);
 346       return NULL;
 347     } else {
 348
 349 #ifdef COMPILER
 350       return &objcopy[1];
 351 #else
 352       return objcopy;
 353 #endif
 354     }
 355   }
 356 }
 357
 358 /* This function creates objects in the transaction record */
 359 objheader_t *transCreateObj(transrecord_t *record, unsigned int size)
 360 {
 361         objheader_t *tmp = (objheader_t *) objstrAlloc(record->cache, (sizeof(objheader_t) + size));
 362         tmp->notifylist = NULL;
 363         OID(tmp) = getNewOID();
 364         tmp->version = 1;
 365         tmp->rcount = 1;
 366         STATUS(tmp) = NEW;
 367         chashInsert(record->lookupTable, OID(tmp), tmp);
 368
 369 #ifdef COMPILER
 370         return &tmp[1]; //want space after object header
 371 #else
 372         return tmp;
 373 #endif
 374 }
 375
 376 /* This function creates machine piles based on all machines involved in a
 377  * transaction commit request */
 378 plistnode_t *createPiles(transrecord_t *record) {
 379         int i = 0;
 380         unsigned int size;/* Represents number of bins in the chash table */
 381         chashlistnode_t *curr, *ptr, *next;
 382         plistnode_t *pile = NULL;
 383         unsigned int machinenum;
 384         void *localmachinenum;
 385         objheader_t *headeraddr;
 386
 387         ptr = record->lookupTable->table;
 388         size = record->lookupTable->size;
 389
 390         for(i = 0; i < size ; i++) {
 391                 curr = &ptr[i];
 392                 /* Inner loop to traverse the linked list of the cache lookupTable */
 393                 while(curr != NULL) {
 394                         //if the first bin in hash table is empty
 395                         if(curr->key == 0) {
 396                                 break;
 397                         }
 398                         next = curr->next;
 399
 400                         if ((headeraddr = chashSearch(record->lookupTable, curr->key)) == NULL) {
 401                                 printf("Error: No such oid %s, %d\n", __FILE__, __LINE__);
 402                                 return NULL;
 403                         }
 404
 405                         //Get machine location for object id (and whether local or not)
 406                         if (STATUS(headeraddr) & NEW || (mhashSearch(curr->key) != NULL)) {
 407                                 machinenum = myIpAddr;
 408                         } else  if ((machinenum = lhashSearch(curr->key)) == 0) {
 409                                 printf("Error: No such machine %s, %d\n", __FILE__, __LINE__);
 410                                 return NULL;
 411                         }
 412
 413                         //Make machine groups
 414                         if ((pile = pInsert(pile, headeraddr, machinenum, record->lookupTable->numelements)) == NULL) {
 415                                 printf("pInsert error %s, %d\n", __FILE__, __LINE__);
 416                                 return NULL;
 417                         }
 418
 419                         curr = next;
 420                 }
 421         }
 422         return pile;
 423 }
 424
 425 /* This function initiates the transaction commit process
 426  * Spawns threads for each of the new connections with Participants
 427  * and creates new piles by calling the createPiles(),
 428  * Sends a transrequest() to each remote machines for objects found remotely
 429  * and calls handleLocalReq() to process objects found locally */
 430 int transCommit(transrecord_t *record) {
 431         unsigned int tot_bytes_mod, *listmid;
 432         plistnode_t *pile, *pile_ptr;
 433         int i, j, rc, val;
 434         int pilecount, offset, threadnum = 0, trecvcount = 0;
 435         char control;
 436         char transid[TID_LEN];
 437         trans_req_data_t *tosend;
 438         trans_commit_data_t transinfo;
 439         static int newtid = 0;
 440         char treplyctrl = 0, treplyretry = 0; /* keeps track of the common response that needs to be sent */
 441         char localstat = 0;
 442         thread_data_array_t *thread_data_array;
 443         local_thread_data_array_t *ltdata;
 444
 445         do {
 446                 trecvcount = 0;
 447                 threadnum = 0;
 448                 treplyretry = 0;
 449                 thread_data_array = NULL;
 450                 ltdata = NULL;
 451
 452                 /* Look through all the objects in the transaction record and make piles
 453                  * for each machine involved in the transaction*/
 454                 pile_ptr = pile = createPiles(record);
 455
 456                 /* Create the packet to be sent in TRANS_REQUEST */
 457
 458                 /* Count the number of participants */
 459                 pilecount = pCount(pile);
 460
 461                 /* Create a list of machine ids(Participants) involved in transaction   */
 462                 if((listmid = calloc(pilecount, sizeof(unsigned int))) == NULL) {
 463                         printf("Calloc error %s, %d\n", __FILE__, __LINE__);
 464                         return 1;
 465                 }
 466                 pListMid(pile, listmid);
 467
 468
 469                 /* Initialize thread variables,
 470                  * Spawn a thread for each Participant involved in a transaction */
 471                 pthread_t thread[pilecount];
 472                 pthread_attr_t attr;
 473                 pthread_cond_t tcond;
 474                 pthread_mutex_t tlock;
 475                 pthread_mutex_t tlshrd;
 476
 477                 if((thread_data_array = (thread_data_array_t *) calloc(pilecount, sizeof(thread_data_array_t))) == NULL) {
 478                         printf("Calloc error %s, %d\n", __FILE__, __LINE__);
 479                         pthread_cond_destroy(&tcond);
 480                         pthread_mutex_destroy(&tlock);
 481                         pDelete(pile_ptr);
 482                         free(listmid);
 483                         return 1;
 484                 }
 485
 486                 if((ltdata = calloc(1, sizeof(local_thread_data_array_t))) == NULL) {
 487                         printf("Calloc error %s, %d\n", __FILE__, __LINE__);
 488                         pthread_cond_destroy(&tcond);
 489                         pthread_mutex_destroy(&tlock);
 490                         pDelete(pile_ptr);
 491                         free(listmid);
 492                         free(thread_data_array);
 493                         return 1;
 494                 }
 495
 496                 thread_response_t rcvd_control_msg[pilecount];  /* Shared thread array that keeps track of responses of participants */
 497
 498                 /* Initialize and set thread detach attribute */
 499                 pthread_attr_init(&attr);
 500                 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
 501                 pthread_mutex_init(&tlock, NULL);
 502                 pthread_cond_init(&tcond, NULL);
 503
 504                 /* Process each machine pile */
 505                 while(pile != NULL) {
 506                         //Create transaction id
 507                         newtid++;
 508                         if ((tosend = calloc(1, sizeof(trans_req_data_t))) == NULL) {
 509                                 printf("Calloc error %s, %d\n", __FILE__, __LINE__);
 510                                 pthread_cond_destroy(&tcond);
 511                                 pthread_mutex_destroy(&tlock);
 512                                 pDelete(pile_ptr);
 513                                 free(listmid);
 514                                 free(thread_data_array);
 515                                 free(ltdata);
 516                                 return 1;
 517                         }
 518                         tosend->f.control = TRANS_REQUEST;
 519                         sprintf(tosend->f.trans_id, "%x_%d", pile->mid, newtid);
 520                         tosend->f.mcount = pilecount;
 521                         tosend->f.numread = pile->numread;
 522                         tosend->f.nummod = pile->nummod;
 523                         tosend->f.numcreated = pile->numcreated;
 524                         tosend->f.sum_bytes = pile->sum_bytes;
 525                         tosend->listmid = listmid;
 526                         tosend->objread = pile->objread;
 527                         tosend->oidmod = pile->oidmod;
 528                         tosend->oidcreated = pile->oidcreated;
 529                         thread_data_array[threadnum].thread_id = threadnum;
 530                         thread_data_array[threadnum].mid = pile->mid;
 531                         thread_data_array[threadnum].buffer = tosend;
 532                         thread_data_array[threadnum].recvmsg = rcvd_control_msg;
 533                         thread_data_array[threadnum].threshold = &tcond;
 534                         thread_data_array[threadnum].lock = &tlock;
 535                         thread_data_array[threadnum].count = &trecvcount;
 536                         thread_data_array[threadnum].replyctrl = &treplyctrl;
 537                         thread_data_array[threadnum].replyretry = &treplyretry;
 538                         thread_data_array[threadnum].rec = record;
 539                         /* If local do not create any extra connection */
 540                         if(pile->mid != myIpAddr) { /* Not local */
 541                                 do {
 542                                         rc = pthread_create(&thread[threadnum], &attr, transRequest, (void *) &thread_data_array[threadnum]);
 543                                 } while(rc!=0);
 544                                 if(rc) {
 545                                         perror("Error in pthread create\n");
 546                                         pthread_cond_destroy(&tcond);
 547                                         pthread_mutex_destroy(&tlock);
 548                                         pDelete(pile_ptr);
 549                                         free(listmid);
 550                                         for (i = 0; i < threadnum; i++)
 551                                                 free(thread_data_array[i].buffer);
 552                                         free(thread_data_array);
 553                                         free(ltdata);
 554                                         return 1;
 555                                 }
 556                         } else { /*Local*/
 557                                 ltdata->tdata = &thread_data_array[threadnum];
 558                                 ltdata->transinfo = &transinfo;
 559                                 do {
 560                                         val = pthread_create(&thread[threadnum], &attr, handleLocalReq, (void *) ltdata);
 561                                 } while(val!=0);
 562                                 if(val) {
 563                                         perror("Error in pthread create\n");
 564                                         pthread_cond_destroy(&tcond);
 565                                         pthread_mutex_destroy(&tlock);
 566                                         pDelete(pile_ptr);
 567                                         free(listmid);
 568                                         for (i = 0; i < threadnum; i++)
 569                                                 free(thread_data_array[i].buffer);
 570                                         free(thread_data_array);
 571                                         free(ltdata);
 572                                         return 1;
 573                                 }
 574                         }
 575
 576                         threadnum++;
 577                         pile = pile->next;
 578                 }
 579                 /* Free attribute and wait for the other threads */
 580                 pthread_attr_destroy(&attr);
 581
 582                 for (i = 0; i < threadnum; i++) {
 583                         rc = pthread_join(thread[i], NULL);
 584                         if(rc)
 585                         {
 586                                 printf("Error: return code from pthread_join() is %d\n", rc);
 587                                 pthread_cond_destroy(&tcond);
 588                                 pthread_mutex_destroy(&tlock);
 589                                 pDelete(pile_ptr);
 590                                 free(listmid);
 591                                 for (j = i; j < threadnum; j++) {
 592                                         free(thread_data_array[j].buffer);
 593                                 }
 594                                 return 1;
 595                         }
 596                         free(thread_data_array[i].buffer);
 597                 }
 598
 599                 /* Free resources */
 600                 pthread_cond_destroy(&tcond);
 601                 pthread_mutex_destroy(&tlock);
 602                 free(listmid);
 603                 pDelete(pile_ptr);
 604
 605                 /* wait a random amount of time before retrying to commit transaction*/
 606                 if(treplyretry == 1) {
 607                         free(thread_data_array);
 608                         free(ltdata);
 609                         randomdelay();
 610                 }
 611
 612         /* Retry trans commit procedure during soft_abort case */
 613         } while (treplyretry == 1);
 614
 615
 616         if(treplyctrl == TRANS_ABORT) {
 617                 /* Free Resources */
 618                 objstrDelete(record->cache);
 619                 chashDelete(record->lookupTable);
 620                 free(record);
 621                 free(thread_data_array);
 622                 free(ltdata);
 623                 return TRANS_ABORT;
 624         } else if(treplyctrl == TRANS_COMMIT) {
 625                 /* Free Resources */
 626                 objstrDelete(record->cache);
 627                 chashDelete(record->lookupTable);
 628                 free(record);
 629                 free(thread_data_array);
 630                 free(ltdata);
 631                 return 0;
 632         } else {
 633                 //TODO Add other cases
 634                 printf("Error: in %s() THIS SHOULD NOT HAPPEN.....EXIT PROGRAM\n", __func__);
 635                 exit(-1);
 636         }
 637         return 0;
 638 }
 639
 640 /* This function sends information involved in the transaction request
 641  * to participants and accepts a response from particpants.
 642  * It calls decideresponse() to decide on what control message
 643  * to send next to participants and sends the message using sendResponse()*/
 644 void *transRequest(void *threadarg) {
 645         int sd, i, n;
 646         struct sockaddr_in serv_addr;
 647         thread_data_array_t *tdata;
 648         objheader_t *headeraddr;
 649         char control, recvcontrol;
 650         char machineip[16], retval;
 651
 652         tdata = (thread_data_array_t *) threadarg;
 653
 654         /* Send Trans Request */
 655         if ((sd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
 656                 perror("Error in socket for TRANS_REQUEST\n");
 657                 pthread_exit(NULL);
 658         }
 659         bzero((char*) &serv_addr, sizeof(serv_addr));
 660         serv_addr.sin_family = AF_INET;
 661         serv_addr.sin_port = htons(LISTEN_PORT);
 662         midtoIP(tdata->mid,machineip);
 663         machineip[15] = '\0';
 664         serv_addr.sin_addr.s_addr = inet_addr(machineip);
 665         /* Open Connection */
 666         if (connect(sd, (struct sockaddr *) &serv_addr, sizeof(struct sockaddr)) < 0) {
 667                 perror("Error in connect for TRANS_REQUEST\n");
 668                 close(sd);
 669                 pthread_exit(NULL);
 670         }
 671
 672         /* Send bytes of data with TRANS_REQUEST control message */
 673         send_data(sd, &(tdata->buffer->f), sizeof(fixed_data_t));
 674
 675         /* Send list of machines involved in the transaction */
 676         {
 677                 int size=sizeof(unsigned int)*tdata->buffer->f.mcount;
 678                 send_data(sd, tdata->buffer->listmid, size);
 679         }
 680
 681         /* Send oids and version number tuples for objects that are read */
 682         {
 683                 int size=(sizeof(unsigned int)+sizeof(unsigned short))*tdata->buffer->f.numread;
 684                 send_data(sd, tdata->buffer->objread, size);
 685         }
 686
 687         /* Send objects that are modified */
 688         for(i = 0; i < tdata->buffer->f.nummod ; i++) {
 689                 int size;
 690                 headeraddr = chashSearch(tdata->rec->lookupTable, tdata->buffer->oidmod[i]);
 691                 GETSIZE(size,headeraddr);
 692                 size+=sizeof(objheader_t);
 693                 send_data(sd, headeraddr, size);
 694         }
 695
 696         /* Read control message from Participant */
 697         recv_data(sd, &control, sizeof(char));
 698         recvcontrol = control;
 699
 700         /* Update common data structure and increment count */
 701         tdata->recvmsg[tdata->thread_id].rcv_status = recvcontrol;
 702
 703         /* Lock and update count */
 704         /* Thread sleeps until all messages from pariticipants are received by coordinator */
 705         pthread_mutex_lock(tdata->lock);
 706
 707         (*(tdata->count))++; /* keeps track of no of messages received by the coordinator */
 708
 709         /* Wake up the threads and invoke decideResponse (once) */
 710         if(*(tdata->count) == tdata->buffer->f.mcount) {
 711                 decideResponse(tdata);
 712                 pthread_cond_broadcast(tdata->threshold);
 713         } else {
 714                 pthread_cond_wait(tdata->threshold, tdata->lock);
 715         }
 716         pthread_mutex_unlock(tdata->lock);
 717
 718         /* Send the final response such as TRANS_COMMIT or TRANS_ABORT t
 719          * to all participants in their respective socket */
 720         if (sendResponse(tdata, sd) == 0) {
 721                 printf("sendResponse returned error %s,%d\n", __FILE__, __LINE__);
 722                 close(sd);
 723                 pthread_exit(NULL);
 724         }
 725
 726         recv_data((int)sd, &control, sizeof(char));
 727
 728         if(control == TRANS_UNSUCESSFUL) {
 729                 //printf("DEBUG-> TRANS_ABORTED\n");
 730         } else if(control == TRANS_SUCESSFUL) {
 731                 //printf("DEBUG-> TRANS_SUCCESSFUL\n");
 732         } else {
 733                 //printf("DEBUG-> Error: Incorrect Transaction End Message %d\n", control);
 734         }
 735
 736         /* Close connection */
 737         close(sd);
 738         pthread_exit(NULL);
 739 }
 740
 741 /* This function decides the reponse that needs to be sent to
 742  * all Participant machines after the TRANS_REQUEST protocol */
 743 void decideResponse(thread_data_array_t *tdata) {
 744         char control;
 745         int i, transagree = 0, transdisagree = 0, transsoftabort = 0; /* Counters to formulate decision of what
 746                                                                          message to send */
 747
 748         for (i = 0 ; i < tdata->buffer->f.mcount; i++) {
 749                 control = tdata->recvmsg[i].rcv_status; /* tdata: keeps track of all participant responses
 750                                                            written onto the shared array */
 751                 switch(control) {
 752                         default:
 753                                 printf("Participant sent unknown message in %s, %d\n", __FILE__, __LINE__);
 754                                 /* treat as disagree, pass thru */
 755                         case TRANS_DISAGREE:
 756                                 transdisagree++;
 757                                 break;
 758
 759                         case TRANS_AGREE:
 760                                 transagree++;
 761                                 break;
 762
 763                         case TRANS_SOFT_ABORT:
 764                                 transsoftabort++;
 765                                 break;
 766                 }
 767         }
 768
 769         if(transdisagree > 0) {
 770                 /* Send Abort */
 771                 *(tdata->replyctrl) = TRANS_ABORT;
 772                 *(tdata->replyretry) = 0;
 773                 /* clear objects from prefetch cache */
 774                 for (i = 0; i < tdata->buffer->f.numread; i++)
 775                         prehashRemove(*((unsigned int *)(((char *)tdata->buffer->objread) + (sizeof(unsigned int) + sizeof(unsigned short))*i)));
 776                 for (i = 0; i < tdata->buffer->f.nummod; i++)
 777                         prehashRemove(tdata->buffer->oidmod[i]);
 778         } else if(transagree == tdata->buffer->f.mcount){
 779                 /* Send Commit */
 780                 *(tdata->replyctrl) = TRANS_COMMIT;
 781                 *(tdata->replyretry) = 0;
 782         } else {
 783                 /* Send Abort in soft abort case followed by retry commiting transaction again*/
 784                 *(tdata->replyctrl) = TRANS_ABORT;
 785                 *(tdata->replyretry) = 1;
 786         }
 787
 788         return;
 789 }
 790 /* This function sends the final response to remote machines per thread in their respective socket id
 791  * It returns a char that is only needed to check the correctness of execution of this function inside
 792  * transRequest()*/
 793 char sendResponse(thread_data_array_t *tdata, int sd) {
 794         int n, size, sum, oidcount = 0, control;
 795         char *ptr, retval = 0;
 796         unsigned int *oidnotfound;
 797
 798         control = *(tdata->replyctrl);
 799         send_data(sd, &control, sizeof(char));
 800
 801         //TODO read missing objects during object migration
 802         /* If response is a soft abort due to missing objects at the Participant's side */
 803         /*
 804         if(tdata->recvmsg[tdata->thread_id].rcv_status == TRANS_SOFT_ABORT) {
 805                 // Read list of objects missing
 806                 recv_data(sd, &oidcount, sizeof(int));
 807                 //if((read(sd, &oidcount, sizeof(int)) != 0) && (oidcount != 0)) {
 808                 if(oidcount != 0) {
 809                         size = oidcount * sizeof(unsigned int);
 810                         if((oidnotfound = calloc(oidcount, sizeof(unsigned int))) == NULL) {
 811                                 printf("Calloc error %s, %d\n", __FILE__, __LINE__);
 812                                 return 0;
 813                         }
 814                         ptr = (char *) oidnotfound;
 815                         recv_data(sd, ptr, size);
 816                 }
 817                 retval =  TRANS_SOFT_ABORT;
 818         }
 819         */
 820
 821         /* If the decided response is TRANS_ABORT */
 822         if(*(tdata->replyctrl) == TRANS_ABORT) {
 823                 retval = TRANS_ABORT;
 824         } else if(*(tdata->replyctrl) == TRANS_COMMIT) { /* If the decided response is TRANS_COMMIT */
 825                 retval = TRANS_COMMIT;
 826         }
 827
 828         return retval;
 829 }
 830
 831 /* This function opens a connection, places an object read request to the
 832  * remote machine, reads the control message and object if available  and
 833  * copies the object and its header to the local cache.
 834  * */
 835
 836 void *getRemoteObj(transrecord_t *record, unsigned int mnum, unsigned int oid) {
 837   int size, val;
 838   struct sockaddr_in serv_addr;
 839   char machineip[16];
 840   char control;
 841   objheader_t *h;
 842   void *objcopy = NULL;
 843
 844   int sd = getSock2(transReadSockPool, mnum);
 845   char readrequest[sizeof(char)+sizeof(unsigned int)];
 846   readrequest[0] = READ_REQUEST;
 847   *((unsigned int *)(&readrequest[1])) = oid;
 848   send_data(sd, readrequest, sizeof(readrequest));
 849
 850   /* Read response from the Participant */
 851   recv_data(sd, &control, sizeof(char));
 852
 853   if (control==OBJECT_NOT_FOUND) {
 854     objcopy = NULL;
 855   } else {
 856     /* Read object if found into local cache */
 857     recv_data(sd, &size, sizeof(int));
 858     objcopy = objstrAlloc(record->cache, size);
 859     recv_data(sd, objcopy, size);
 860
 861     /* Insert into cache's lookup table */
 862     chashInsert(record->lookupTable, oid, objcopy);
 863   }
 864
 865   //    freeSock(transReadSockPool, mnum, sd);
 866
 867   return objcopy;
 868 }
 869
 870 /* This function handles the local objects involved in a transaction commiting process.
 871  * It also makes a decision if this local machine sends AGREE or DISAGREE or SOFT_ABORT to coordinator.
 872  * Note Coordinator = local machine
 873  * It wakes up the other threads from remote participants that are waiting for the coordinator's decision and
 874  * based on common agreement it either commits or aborts the transaction.
 875  * It also frees the memory resources */
 876 void *handleLocalReq(void *threadarg) {
 877         unsigned int *oidnotfound = NULL, *oidlocked = NULL;
 878         local_thread_data_array_t *localtdata;
 879         int objnotfound = 0, objlocked = 0;
 880         int v_nomatch = 0, v_matchlock = 0, v_matchnolock = 0;
 881         int numread, i;
 882         unsigned int oid;
 883         unsigned short version;
 884         void *mobj;
 885         objheader_t *headptr;
 886
 887         localtdata = (local_thread_data_array_t *) threadarg;
 888
 889         /* Counters and arrays to formulate decision on control message to be sent */
 890         oidnotfound = (unsigned int *) calloc((localtdata->tdata->buffer->f.numread + localtdata->tdata->buffer->f.nummod), sizeof(unsigned int));
 891         oidlocked = (unsigned int *) calloc((localtdata->tdata->buffer->f.numread + localtdata->tdata->buffer->f.nummod), sizeof(unsigned int));
 892
 893         numread = localtdata->tdata->buffer->f.numread;
 894         /* Process each oid in the machine pile/ group per thread */
 895         for (i = 0; i < localtdata->tdata->buffer->f.numread + localtdata->tdata->buffer->f.nummod; i++) {
 896                 if (i < localtdata->tdata->buffer->f.numread) {
 897                         int incr = sizeof(unsigned int) + sizeof(unsigned short);// Offset that points to next position in the objread array
 898                         incr *= i;
 899                         oid = *((unsigned int *)(((char *)localtdata->tdata->buffer->objread) + incr));
 900                         version = *((unsigned short *)(((char *)localtdata->tdata->buffer->objread) + incr + sizeof(unsigned int)));
 901                 } else { // Objects Modified
 902                         int tmpsize;
 903                         headptr = (objheader_t *) chashSearch(localtdata->tdata->rec->lookupTable, localtdata->tdata->buffer->oidmod[i-numread]);
 904                         if (headptr == NULL) {
 905                                 printf("Error: handleLocalReq() returning NULL %s, %d\n", __FILE__, __LINE__);
 906                                 return NULL;
 907                         }
 908                         oid = OID(headptr);
 909                         version = headptr->version;
 910                 }
 911                 /* Check if object is still present in the machine since the beginning of TRANS_REQUEST */
 912
 913                 /* Save the oids not found and number of oids not found for later use */
 914                 if ((mobj = mhashSearch(oid)) == NULL) { /* Obj not found */
 915                         /* Save the oids not found and number of oids not found for later use */
 916                         oidnotfound[objnotfound] = oid;
 917                         objnotfound++;
 918                 } else { /* If Obj found in machine (i.e. has not moved) */
 919                         /* Check if Obj is locked by any previous transaction */
 920                         if ((STATUS((objheader_t *)mobj) & LOCK) == LOCK) {
 921                                 if (version == ((objheader_t *)mobj)->version) {      /* If locked then match versions */
 922                                         v_matchlock++;
 923                                 } else {/* If versions don't match ...HARD ABORT */
 924                                         v_nomatch++;
 925                                         /* Send TRANS_DISAGREE to Coordinator */
 926                                         localtdata->tdata->recvmsg[localtdata->tdata->thread_id].rcv_status = TRANS_DISAGREE;
 927                                 }
 928                         } else {/* If Obj is not locked then lock object */
 929                                 STATUS(((objheader_t *)mobj)) |= LOCK;
 930                                 /* Save all object oids that are locked on this machine during this transaction request call */
 931                                 oidlocked[objlocked] = OID(((objheader_t *)mobj));
 932                                 objlocked++;
 933                                 if (version == ((objheader_t *)mobj)->version) { /* Check if versions match */
 934                                         v_matchnolock++;
 935                                 } else { /* If versions don't match ...HARD ABORT */
 936                                         v_nomatch++;
 937                                         /* Send TRANS_DISAGREE to Coordinator */
 938                                         localtdata->tdata->recvmsg[localtdata->tdata->thread_id].rcv_status = TRANS_DISAGREE;
 939                                 }
 940                         }
 941                 }
 942         } // End for
 943         /* Condition to send TRANS_AGREE */
 944         if(v_matchnolock == localtdata->tdata->buffer->f.numread + localtdata->tdata->buffer->f.nummod) {
 945                 localtdata->tdata->recvmsg[localtdata->tdata->thread_id].rcv_status = TRANS_AGREE;
 946         }
 947         /* Condition to send TRANS_SOFT_ABORT */
 948         if((v_matchlock > 0 && v_nomatch == 0) || (objnotfound > 0 && v_nomatch == 0)) {
 949                 localtdata->tdata->recvmsg[localtdata->tdata->thread_id].rcv_status = TRANS_SOFT_ABORT;
 950         }
 951
 952         /* Fill out the trans_commit_data_t data structure. This is required for a trans commit process
 953          * if Participant receives a TRANS_COMMIT */
 954         localtdata->transinfo->objlocked = oidlocked;
 955         localtdata->transinfo->objnotfound = oidnotfound;
 956         localtdata->transinfo->modptr = NULL;
 957         localtdata->transinfo->numlocked = objlocked;
 958         localtdata->transinfo->numnotfound = objnotfound;
 959         /* Lock and update count */
 960         //Thread sleeps until all messages from pariticipants are received by coordinator
 961         pthread_mutex_lock(localtdata->tdata->lock);
 962         (*(localtdata->tdata->count))++; /* keeps track of no of messages received by the coordinator */
 963
 964         /* Wake up the threads and invoke decideResponse (once) */
 965         if(*(localtdata->tdata->count) == localtdata->tdata->buffer->f.mcount) {
 966                 decideResponse(localtdata->tdata);
 967                 pthread_cond_broadcast(localtdata->tdata->threshold);
 968         } else {
 969                 pthread_cond_wait(localtdata->tdata->threshold, localtdata->tdata->lock);
 970         }
 971         pthread_mutex_unlock(localtdata->tdata->lock);
 972         if(*(localtdata->tdata->replyctrl) == TRANS_ABORT){
 973                 if(transAbortProcess(localtdata) != 0) {
 974                         printf("Error in transAbortProcess() %s,%d\n", __FILE__, __LINE__);
 975                         pthread_exit(NULL);
 976                 }
 977         } else if(*(localtdata->tdata->replyctrl) == TRANS_COMMIT) {
 978                 if(transComProcess(localtdata) != 0) {
 979                         printf("Error in transComProcess() %s,%d\n", __FILE__, __LINE__);
 980                         pthread_exit(NULL);
 981                 }
 982         }
 983         /* Free memory */
 984         if (localtdata->transinfo->objlocked != NULL) {
 985                 free(localtdata->transinfo->objlocked);
 986         }
 987         if (localtdata->transinfo->objnotfound != NULL) {
 988                 free(localtdata->transinfo->objnotfound);
 989         }
 990
 991         pthread_exit(NULL);
 992 }
 993
 994 /* This function completes the ABORT process if the transaction is aborting */
 995 int transAbortProcess(local_thread_data_array_t  *localtdata) {
 996         int i, numlocked;
 997         unsigned int *objlocked;
 998         void *header;
 999
1000         numlocked = localtdata->transinfo->numlocked;
1001         objlocked = localtdata->transinfo->objlocked;
1002
1003         for (i = 0; i < numlocked; i++) {
1004                 if((header = mhashSearch(objlocked[i])) == NULL) {
1005                         printf("mhashsearch returns NULL at %s, %d\n", __FILE__, __LINE__);
1006                         return 1;
1007                 }
1008                 STATUS(((objheader_t *)header)) &= ~(LOCK);
1009         }
1010
1011         return 0;
1012 }
1013
1014 /*This function completes the COMMIT process is the transaction is commiting*/
1015 int transComProcess(local_thread_data_array_t  *localtdata) {
1016         objheader_t *header, *tcptr;
1017         int i, nummod, tmpsize, numcreated, numlocked;
1018         unsigned int *oidmod, *oidcreated, *oidlocked;
1019         void *ptrcreate;
1020
1021         nummod = localtdata->tdata->buffer->f.nummod;
1022         oidmod = localtdata->tdata->buffer->oidmod;
1023         numcreated = localtdata->tdata->buffer->f.numcreated;
1024         oidcreated = localtdata->tdata->buffer->oidcreated;
1025         numlocked = localtdata->transinfo->numlocked;
1026         oidlocked = localtdata->transinfo->objlocked;
1027
1028         for (i = 0; i < nummod; i++) {
1029                 if((header = (objheader_t *) mhashSearch(oidmod[i])) == NULL) {
1030                         printf("Error: transComProcess() mhashsearch returns NULL at %s, %d\n", __FILE__, __LINE__);
1031                         return 1;
1032                 }
1033                 /* Copy from transaction cache -> main object store */
1034                 if ((tcptr = ((objheader_t *) chashSearch(localtdata->tdata->rec->lookupTable, oidmod[i]))) == NULL) {
1035                         printf("Error: transComProcess() chashSearch returned NULL at %s, %d\n", __FILE__, __LINE__);
1036                         return 1;
1037                 }
1038                 GETSIZE(tmpsize, header);
1039                 pthread_mutex_lock(&mainobjstore_mutex);
1040                 memcpy((char*)header+sizeof(objheader_t), (char *)tcptr+ sizeof(objheader_t), tmpsize);
1041                 header->version += 1;
1042                 if(header->notifylist != NULL) {
1043                         notifyAll(&header->notifylist, OID(header), header->version);
1044                 }
1045                 pthread_mutex_unlock(&mainobjstore_mutex);
1046         }
1047         /* If object is newly created inside transaction then commit it */
1048         for (i = 0; i < numcreated; i++) {
1049                 if ((header = ((objheader_t *) chashSearch(localtdata->tdata->rec->lookupTable, oidcreated[i]))) == NULL) {
1050                         printf("Error: transComProcess() chashSearch returned NULL at %s, %d\n", __FILE__, __LINE__);
1051                         return 1;
1052                 }
1053                 GETSIZE(tmpsize, header);
1054                 tmpsize += sizeof(objheader_t);
1055                 pthread_mutex_lock(&mainobjstore_mutex);
1056                 if ((ptrcreate = objstrAlloc(mainobjstore, tmpsize)) == NULL) {
1057                         printf("Error: transComProcess() failed objstrAlloc %s, %d\n", __FILE__, __LINE__);
1058                         pthread_mutex_unlock(&mainobjstore_mutex);
1059                         return 1;
1060                 }
1061                 pthread_mutex_unlock(&mainobjstore_mutex);
1062                 memcpy(ptrcreate, header, tmpsize);
1063                 mhashInsert(oidcreated[i], ptrcreate);
1064                 lhashInsert(oidcreated[i], myIpAddr);
1065         }
1066         /* Unlock locked objects */
1067         for(i = 0; i < numlocked; i++) {
1068                 if((header = (objheader_t *) mhashSearch(oidlocked[i])) == NULL) {
1069                         printf("mhashsearch returns NULL at %s, %d\n", __FILE__, __LINE__);
1070                         return 1;
1071                 }
1072                 STATUS(header) &= ~(LOCK);
1073         }
1074
1075         return 0;
1076 }
1077
1078 /* This function checks if the prefetch oids are same and have same offsets
1079  * for case x.a.b and y.a.b where x and y have same oid's
1080  * or if a.b.c is a subset of x.b.c.d*/
1081 /* check for case where the generated request a.y.z or x.y.z.g then
1082  * prefetch needs to be generated for x.y.z.g  if oid of a and x are same*/
1083 void checkPrefetchTuples(prefetchqelem_t *node) {
1084         int i,j, count,k, sindex, index;
1085         char *ptr, *tmp;
1086         int ntuples, slength;
1087         unsigned int *oid;
1088         unsigned short *endoffsets;
1089         short *offsets;
1090
1091         /* Check for the case x.y.z and a.b.c are same oids */
1092         ptr = (char *) node;
1093         ntuples = *(GET_NTUPLES(ptr));
1094         oid = GET_PTR_OID(ptr);
1095         endoffsets = GET_PTR_EOFF(ptr, ntuples);
1096         offsets = GET_PTR_ARRYFLD(ptr, ntuples);
1097
1098         /* Find offset length for each tuple */
1099         int numoffset[ntuples];
1100         numoffset[0] = endoffsets[0];
1101         for(i = 1; i<ntuples; i++) {
1102                 numoffset[i] = endoffsets[i] - endoffsets[i-1];
1103         }
1104         /* Check for redundant tuples by comparing oids of each tuple */
1105         for(i = 0; i < ntuples; i++) {
1106                 if(oid[i] == 0)
1107                         continue;
1108                 for(j = i+1 ; j < ntuples; j++) {
1109                         if(oid[j] == 0)
1110                                 continue;
1111                         /*If oids of tuples match */
1112                         if (oid[i] == oid[j]) {
1113                                 /* Find the smallest offset length of two tuples*/
1114                                 if(numoffset[i] >  numoffset[j]){
1115                                         slength = numoffset[j];
1116                                         sindex = j;
1117                                 }
1118                                 else {
1119                                         slength = numoffset[i];
1120                                         sindex = i;
1121                                 }
1122
1123                                 /* Compare the offset values based on the current indices
1124                                  * break if they do not match
1125                                  * if all offset values match then pick the largest tuple*/
1126
1127                                 if(i == 0) {
1128                                         k = 0;
1129                                 } else {
1130                                         k = endoffsets[i-1];
1131                                 }
1132                                 index = endoffsets[j -1];
1133                                 for(count = 0; count < slength; count ++) {
1134                                         if (offsets[k] != offsets[index]) {
1135                                                 break;
1136                                         }
1137                                         index++;
1138                                         k++;
1139                                 }
1140                                 if(slength == count) {
1141                                         oid[sindex] = 0;
1142                                 }
1143                         }
1144                 }
1145         }
1146 }
1147 /* This function makes machine piles to be added into the machine pile queue for each prefetch call */
1148 prefetchpile_t *makePreGroups(prefetchqelem_t *node, int *numoffset) {
1149         char *ptr;
1150         int ntuples, i, machinenum, count=0;
1151         unsigned int *oid;
1152         unsigned short *endoffsets;
1153         short *arryfields, *offset;
1154         prefetchpile_t *head = NULL, *tmp = NULL;
1155
1156         /* Check for the case x.y.z and a.b.c are same oids */
1157         ptr = (char *) node;
1158         ntuples = *(GET_NTUPLES(ptr));
1159         oid = GET_PTR_OID(ptr);
1160         endoffsets = GET_PTR_EOFF(ptr, ntuples);
1161         arryfields = GET_PTR_ARRYFLD(ptr, ntuples);
1162
1163         if((head = (prefetchpile_t *) calloc(1, sizeof(prefetchpile_t))) == NULL) {
1164                 printf("Calloc error: %s %d\n", __FILE__, __LINE__);
1165                 return NULL;
1166         }
1167
1168         /* Check for redundant tuples by comparing oids of each tuple */
1169         for(i = 0; i < ntuples; i++) {
1170                 if(oid[i] == 0){
1171                         if(head->next != NULL) {
1172                                 if((tmp = (prefetchpile_t *) calloc(1, sizeof(prefetchpile_t))) == NULL) {
1173                                         printf("Calloc error: %s %d\n", __FILE__, __LINE__);
1174                                         return NULL;
1175                                 }
1176                                 tmp->mid = myIpAddr;
1177                                 tmp->next = head;
1178                                 head = tmp;
1179                         } else {
1180                                 head->mid = myIpAddr;
1181                         }
1182                         continue;
1183                 }
1184                 /* For each tuple make piles */
1185                 if ((machinenum = lhashSearch(oid[i])) == 0) {
1186                         printf("Error: No such Machine %s, %d\n", __FILE__, __LINE__);
1187                         return NULL;
1188                 }
1189                 /* Insert into machine pile */
1190                 if(i == 0){
1191                         offset = &arryfields[0];
1192                 } else {
1193                         offset = &arryfields[endoffsets[i-1]];
1194                 }
1195
1196                 if((head = insertPile(machinenum, oid[i], numoffset[i], offset, head)) == NULL){
1197                         printf("Error: Couldn't create a pile %s, %d\n", __FILE__, __LINE__);
1198                         return NULL;
1199                 }
1200         }
1201
1202         return head;
1203 }
1204
1205 prefetchpile_t *foundLocal(prefetchqelem_t *node) {
1206         int ntuples,i, j, k, oidnfound = 0, arryfieldindex,nextarryfieldindex, flag = 0, val;
1207         unsigned int *oid;
1208         int isArray;
1209         char *ptr, *tmp;
1210         objheader_t *objheader;
1211         unsigned short *endoffsets;
1212         short *arryfields;
1213
1214         ptr = (char *) node;
1215         ntuples = *(GET_NTUPLES(ptr));
1216         oid = GET_PTR_OID(ptr);
1217         endoffsets = GET_PTR_EOFF(ptr, ntuples);
1218         arryfields = GET_PTR_ARRYFLD(ptr, ntuples);
1219
1220         /* Find offset length for each tuple */
1221         int numoffset[ntuples];//Number of offsets for each tuple
1222         numoffset[0] = endoffsets[0];
1223         for(i = 1; i<ntuples; i++) {
1224                 numoffset[i] = endoffsets[i] - endoffsets[i-1];
1225         }
1226
1227         for(i = 0; i < ntuples; i++) {
1228                 if(oid[i] == 0){
1229                         if(i == 0) {
1230                                 arryfieldindex = 0;
1231                                 nextarryfieldindex =  endoffsets[0];
1232                         }else {
1233                                 arryfieldindex = endoffsets[i-1];
1234                                 nextarryfieldindex =  endoffsets[i];
1235                         }
1236                         numoffset[i] = 0;
1237                         endoffsets[0] = val = numoffset[0];
1238                         for(k = 1; k < ntuples; k++) {
1239                                 val = val + numoffset[k];
1240                                 endoffsets[k] = val;
1241                         }
1242
1243                         for(k = 0; k<endoffsets[ntuples-1]; k++) {
1244                                 arryfields[arryfieldindex+k] = arryfields[nextarryfieldindex+k];
1245                         }
1246                         continue;
1247                 }
1248
1249                 /* If object found locally */
1250                 if((objheader = (objheader_t*) mhashSearch(oid[i])) != NULL) {
1251                         isArray = 0;
1252                         tmp = (char *) objheader;
1253                         int orgnumoffset = numoffset[i];
1254                         if(i == 0) {
1255                                 arryfieldindex = 0;
1256                         }else {
1257                                 arryfieldindex = endoffsets[i-1];
1258                         }
1259
1260                         for(j = 0; j<orgnumoffset; j++) {
1261                                 unsigned int objoid = 0;
1262                                 /* Check for arrays  */
1263                                 if(TYPE(objheader) > NUMCLASSES) {
1264                                         isArray = 1;
1265                                 }
1266                                 if(isArray == 1) {
1267                                         int elementsize = classsize[TYPE(objheader)];
1268                                         struct ArrayObject *ao = (struct ArrayObject *) (tmp + sizeof(objheader_t));
1269                                         int length = ao->___length___;
1270                                         /* Check if array out of bounds */
1271                                         if(arryfields[arryfieldindex] < 0 || arryfields[arryfieldindex] >= length) {
1272                                                 break; //if yes then treat the object as found
1273                                         }
1274                                         objoid = *((unsigned int *)(tmp + sizeof(objheader_t) + sizeof(struct ArrayObject) + (elementsize*arryfields[arryfieldindex])));
1275                                 } else {
1276                                         objoid = *((unsigned int *)(tmp + sizeof(objheader_t) + arryfields[arryfieldindex]));
1277                                 }
1278                                 //Update numoffset array
1279                                 numoffset[i] = numoffset[i] - 1;
1280                                 //Update oid array
1281                                 oid[i] = objoid;
1282                                 //Update endoffset array
1283                                 endoffsets[0] = val = numoffset[0];
1284                                 for(k = 1; k < ntuples; k++) {
1285                                         val = val + numoffset[k];
1286                                         endoffsets[k] = val;
1287                                 }
1288                                 //Update arrayfields array
1289                                 for(k = 0; k < endoffsets[ntuples-1]; k++) {
1290                                         arryfields[arryfieldindex+k] = arryfields[arryfieldindex+k+1];
1291                                 }
1292                                 if((objheader = (objheader_t*) mhashSearch(oid[i])) == NULL) {
1293                                         flag = 1;
1294                                         checkPreCache(node, numoffset, oid[i], i);
1295                                         break;
1296                                 }
1297                                 tmp = (char *) objheader;
1298                                 isArray = 0;
1299                         }
1300                         /*If all offset oids are found locally,make the prefetch tuple invalid */
1301                         if(flag == 0) {
1302                                 oid[i] = 0;
1303                         }
1304                 } else {
1305                         /* Look in Prefetch cache */
1306                         checkPreCache(node, numoffset, oid[i],i);
1307                 }
1308                 flag = 0;
1309         }
1310
1311         /* Make machine groups */
1312         prefetchpile_t *head = NULL;
1313         if((head = makePreGroups(node, numoffset)) == NULL) {
1314                 printf("Error in makePreGroups() %s %d\n", __FILE__, __LINE__);
1315                 return NULL;
1316         }
1317
1318         return head;
1319 }
1320
1321 void checkPreCache(prefetchqelem_t *node, int *numoffset, unsigned int objoid, int index) {
1322         char *ptr, *tmp;
1323         int ntuples, i, k, flag=0, isArray =0, arryfieldindex, val;
1324         unsigned int * oid;
1325         unsigned short *endoffsets;
1326         short *arryfields;
1327         objheader_t *header;
1328
1329         ptr = (char *) node;
1330         ntuples = *(GET_NTUPLES(ptr));
1331         oid = GET_PTR_OID(ptr);
1332         endoffsets = GET_PTR_EOFF(ptr, ntuples);
1333         arryfields = GET_PTR_ARRYFLD(ptr, ntuples);
1334
1335         if((header = (objheader_t *) prehashSearch(objoid)) == NULL) {
1336                 return;
1337         } else { //Found in Prefetch Cache
1338                 //TODO Decide if object is too old, if old remove from cache
1339                 tmp = (char *) header;
1340                 int loopcount = numoffset[index];
1341                 if(index == 0)
1342                         arryfieldindex = 0;
1343                 else
1344                         arryfieldindex = endoffsets[(index - 1)];
1345                 // Check if any of the offset oid is available in the Prefetch cache
1346                 for(i = 0; i < loopcount; i++) {
1347                         /* Check for arrays  */
1348                         if(TYPE(header) > NUMCLASSES) {
1349                                 isArray = 1;
1350                         }
1351
1352                         if(isArray == 1) {
1353                                 int elementsize = classsize[TYPE(header)];
1354                                 struct ArrayObject *ao = (struct ArrayObject *) (tmp + sizeof(objheader_t));
1355                                 int length = ao->___length___;
1356                                 /* Check if array out of bounds */
1357                                 if(arryfields[arryfieldindex] < 0 || arryfields[arryfieldindex] >= length) {
1358                                         break; //if yes treat the object as found
1359                                 }
1360                                 objoid = *((unsigned int *)(tmp + sizeof(objheader_t) + sizeof(struct ArrayObject) + (elementsize*arryfields[arryfieldindex])));
1361                         } else {
1362                                 objoid = *((unsigned int *)(tmp + sizeof(objheader_t) + arryfields[arryfieldindex]));
1363                         }
1364                         //Update numoffset array
1365                         numoffset[index] = numoffset[index] - 1;
1366                         //Update oid array
1367                         oid[index] = objoid;
1368                         //Update endoffset array
1369                         endoffsets[0] = val = numoffset[0];
1370                         for(k = 1; k < ntuples; k++) {
1371                                 val = val + numoffset[k];
1372                                 endoffsets[k] = val;
1373                         }
1374                         //Update arrayfields array
1375                         for(k = 0; k < endoffsets[ntuples-1]; k++) {
1376                                 arryfields[arryfieldindex+k] = arryfields[arryfieldindex+k+1];
1377                         }
1378                         if((header = (objheader_t *)prehashSearch(oid[index])) != NULL) {
1379                                 tmp = (char *) header;
1380                                 isArray = 0;
1381                         } else {
1382                                 flag = 1;
1383                                 break;
1384                         }
1385                 }
1386         }
1387         //Found in the prefetch cache
1388         if(flag == 0 && (numoffset[index] == 0)) {
1389                 oid[index] = 0;
1390         }
1391 }
1392
1393
1394
1395 /* This function is called by the thread calling transPrefetch */
1396 void *transPrefetch(void *t) {
1397   while(1) {
1398     /* lock mutex of primary prefetch queue */
1399     pthread_mutex_lock(&pqueue.qlock);
1400     /* while primary queue is empty, then wait */
1401     while((pqueue.front == NULL) && (pqueue.rear == NULL)) {
1402       pthread_cond_wait(&pqueue.qcond, &pqueue.qlock);
1403     }
1404
1405     /* dequeue node to create a machine piles and  finally unlock mutex */
1406     prefetchqelem_t *qnode;
1407     if((qnode = pre_dequeue()) == NULL) {
1408       printf("Error: No node returned %s, %d\n", __FILE__, __LINE__);
1409       pthread_mutex_unlock(&pqueue.qlock);
1410       continue;
1411     }
1412     pthread_mutex_unlock(&pqueue.qlock);
1413
1414     /* Reduce redundant prefetch requests */
1415     checkPrefetchTuples(qnode);
1416     /* Check if the tuples are found locally, if yes then reduce them further*/
1417     /* and group requests by remote machine ids by calling the makePreGroups() */
1418     prefetchpile_t *pilehead = foundLocal(qnode);
1419
1420     // Get sock from shared pool
1421     int sd = getSock2(transPrefetchSockPool, pilehead->mid);
1422
1423     /* Send  Prefetch Request */
1424     prefetchpile_t *ptr = pilehead;
1425     while(ptr != NULL) {
1426       sendPrefetchReq(ptr, sd);
1427       ptr = ptr->next;
1428     }
1429
1430     /* Release socket */
1431     //  freeSock(transPrefetchSockPool, pilehead->mid, sd);
1432
1433     /* Deallocated pilehead */
1434     mcdealloc(pilehead);
1435
1436     // Deallocate the prefetch queue pile node
1437     predealloc(qnode);
1438   }
1439 }
1440
1441 void sendPrefetchReq(prefetchpile_t *mcpilenode, int sd) {
1442   int off, len, endpair, count = 0;
1443   char control;
1444   objpile_t *tmp;
1445
1446   /* Send TRANS_PREFETCH control message */
1447   control = TRANS_PREFETCH;
1448   send_data(sd, &control, sizeof(char));
1449
1450   /* Send Oids and offsets in pairs */
1451   tmp = mcpilenode->objpiles;
1452   while(tmp != NULL) {
1453     off = 0;
1454     count++;  /* Keeps track of the number of oid and offset tuples sent per remote machine */
1455     len = sizeof(int) + sizeof(unsigned int) + sizeof(unsigned int) + ((tmp->numoffset) * sizeof(short));
1456     char oidnoffset[len];
1457     bzero(oidnoffset, len);
1458     *((int*)oidnoffset) = len;
1459     off = sizeof(int);
1460     *((unsigned int *)(oidnoffset + off)) = tmp->oid;
1461     off += sizeof(unsigned int);
1462     *((unsigned int *)(oidnoffset + off)) = myIpAddr;
1463     off += sizeof(unsigned int);
1464     int i;
1465     for(i = 0; i < tmp->numoffset; i++) {
1466       *((short*)(oidnoffset + off)) = tmp->offset[i];
1467       off+=sizeof(short);
1468     }
1469     send_data(sd, oidnoffset, len);
1470     tmp = tmp->next;
1471   }
1472
1473   /* Send a special char -1 to represent the end of sending oids + offset pair to remote machine */
1474   endpair = -1;
1475   send_data(sd, &endpair, sizeof(int));
1476
1477   return;
1478 }
1479
1480 int getPrefetchResponse(int sd) {
1481         int numbytes = 0, length = 0, size = 0;
1482         char *recvbuffer, control;
1483         unsigned int oid;
1484         void *modptr, *oldptr;
1485
1486         recv_data((int)sd, &length, sizeof(int));
1487         size = length - sizeof(int);
1488         if((recvbuffer = calloc(1, size)) == NULL) {
1489                 printf("%s() Calloc error at %s,%d\n", __func__, __FILE__, __LINE__);
1490                 return -1;
1491         }
1492
1493         recv_data((int)sd, recvbuffer, size);
1494
1495         control = *((char *) recvbuffer);
1496         if(control == OBJECT_FOUND) {
1497                 numbytes = 0;
1498                 oid = *((unsigned int *)(recvbuffer + sizeof(char)));
1499                 size = size - (sizeof(char) + sizeof(unsigned int));
1500                 pthread_mutex_lock(&prefetchcache_mutex);
1501                 if ((modptr = objstrAlloc(prefetchcache, size)) == NULL) {
1502                         printf("Error: objstrAlloc error for copying into prefetch cache %s, %d\n", __FILE__, __LINE__);
1503                         pthread_mutex_unlock(&prefetchcache_mutex);
1504                         free(recvbuffer);
1505                         return -1;
1506                 }
1507                 pthread_mutex_unlock(&prefetchcache_mutex);
1508                 memcpy(modptr, recvbuffer + sizeof(char) + sizeof(unsigned int), size);
1509
1510                 /* Insert the oid and its address into the prefetch hash lookup table */
1511                 /* Do a version comparison if the oid exists */
1512                 if((oldptr = prehashSearch(oid)) != NULL) {
1513                         /* If older version then update with new object ptr */
1514                         if(((objheader_t *)oldptr)->version <= ((objheader_t *)modptr)->version) {
1515                                 prehashRemove(oid);
1516                                 prehashInsert(oid, modptr);
1517                         } else {
1518                                 /* TODO modptr should be reference counted */
1519                         }
1520                 } else {/* Else add the object ptr to hash table*/
1521                         prehashInsert(oid, modptr);
1522                 }
1523                 /* Lock the Prefetch Cache look up table*/
1524                 pthread_mutex_lock(&pflookup.lock);
1525                 /* Broadcast signal on prefetch cache condition variable */
1526                 pthread_cond_broadcast(&pflookup.cond);
1527                 /* Unlock the Prefetch Cache look up table*/
1528                 pthread_mutex_unlock(&pflookup.lock);
1529         } else if(control == OBJECT_NOT_FOUND) {
1530                 oid = *((unsigned int *)(recvbuffer + sizeof(char)));
1531                 /* TODO: For each object not found query DHT for new location and retrieve the object */
1532                 /* Throw an error */
1533                 printf("OBJECT %x NOT FOUND.... THIS SHOULD NOT HAPPEN...TERMINATE PROGRAM\n", oid);
1534                 free(recvbuffer);
1535                 exit(-1);
1536         } else {
1537                 printf("Error: in decoding the control value %d, %s, %d\n",control, __FILE__, __LINE__);
1538         }
1539
1540         free(recvbuffer);
1541
1542         return 0;
1543 }
1544
1545 unsigned short getObjType(unsigned int oid)
1546 {
1547         objheader_t *objheader;
1548         unsigned short numoffset[] ={0};
1549         short fieldoffset[] ={};
1550
1551         if ((objheader = (objheader_t *) mhashSearch(oid)) == NULL)
1552         {
1553                 if ((objheader = (objheader_t *) prehashSearch(oid)) == NULL)
1554                 {
1555                         prefetch(1, &oid, numoffset, fieldoffset);
1556                         pthread_mutex_lock(&pflookup.lock);
1557                         while ((objheader = (objheader_t *) prehashSearch(oid)) == NULL)
1558                         {
1559                                 pthread_cond_wait(&pflookup.cond, &pflookup.lock);
1560                         }
1561                         pthread_mutex_unlock(&pflookup.lock);
1562                 }
1563         }
1564
1565         return TYPE(objheader);
1566 }
1567
1568 int startRemoteThread(unsigned int oid, unsigned int mid)
1569 {
1570         int sock;
1571         struct sockaddr_in remoteAddr;
1572         char msg[1 + sizeof(unsigned int)];
1573         int bytesSent;
1574         int status;
1575
1576         if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
1577         {
1578                 perror("startRemoteThread():socket()");
1579                 return -1;
1580         }
1581
1582         bzero(&remoteAddr, sizeof(remoteAddr));
1583         remoteAddr.sin_family = AF_INET;
1584         remoteAddr.sin_port = htons(LISTEN_PORT);
1585         remoteAddr.sin_addr.s_addr = htonl(mid);
1586
1587         if (connect(sock, (struct sockaddr *)&remoteAddr, sizeof(remoteAddr)) < 0)
1588         {
1589                 printf("startRemoteThread():error %d connecting to %s:%d\n", errno,
1590                         inet_ntoa(remoteAddr.sin_addr), LISTEN_PORT);
1591                 status = -1;
1592         }
1593         else
1594         {
1595                 msg[0] = START_REMOTE_THREAD;
1596         *((unsigned int *) &msg[1]) = oid;
1597                 send_data(sock, msg, 1 + sizeof(unsigned int));
1598         }
1599
1600         close(sock);
1601         return status;
1602 }
1603
1604 //TODO: when reusing oids, make sure they are not already in use!
1605 unsigned int getNewOID(void) {
1606         static unsigned int id = 0xFFFFFFFF;
1607
1608         id += 2;
1609         if (id > oidMax || id < oidMin)
1610         {
1611                 id = (oidMin | 1);
1612         }
1613         return id;
1614 }
1615
1616 int processConfigFile()
1617 {
1618         FILE *configFile;
1619         const int maxLineLength = 200;
1620         char lineBuffer[maxLineLength];
1621         char *token;
1622         const char *delimiters = " \t\n";
1623         char *commentBegin;
1624         in_addr_t tmpAddr;
1625
1626         configFile = fopen(CONFIG_FILENAME, "r");
1627         if (configFile == NULL)
1628         {
1629                 printf("error opening %s:\n", CONFIG_FILENAME);
1630                 perror("");
1631                 return -1;
1632         }
1633
1634         numHostsInSystem = 0;
1635         sizeOfHostArray = 8;
1636         hostIpAddrs = calloc(sizeOfHostArray, sizeof(unsigned int));
1637
1638         while(fgets(lineBuffer, maxLineLength, configFile) != NULL)
1639         {
1640                 commentBegin = strchr(lineBuffer, '#');
1641                 if (commentBegin != NULL)
1642                         *commentBegin = '\0';
1643                 token = strtok(lineBuffer, delimiters);
1644                 while (token != NULL)
1645                 {
1646                         tmpAddr = inet_addr(token);
1647                         if ((int)tmpAddr == -1)
1648                         {
1649                                 printf("error in %s: bad token:%s\n", CONFIG_FILENAME, token);
1650                                 fclose(configFile);
1651                                 return -1;
1652                         }
1653                         else
1654                                 addHost(htonl(tmpAddr));
1655                         token = strtok(NULL, delimiters);
1656                 }
1657         }
1658
1659         fclose(configFile);
1660
1661         if (numHostsInSystem < 1)
1662         {
1663                 printf("error in %s: no IP Adresses found\n", CONFIG_FILENAME);
1664                 return -1;
1665         }
1666 #ifdef MAC
1667         myIpAddr = getMyIpAddr("en1");
1668 #else
1669         myIpAddr = getMyIpAddr("eth0");
1670 #endif
1671         myIndexInHostArray = findHost(myIpAddr);
1672         if (myIndexInHostArray == -1)
1673         {
1674                 printf("error in %s: IP Address of eth0 not found\n", CONFIG_FILENAME);
1675                 return -1;
1676         }
1677         oidsPerBlock = (0xFFFFFFFF / numHostsInSystem) + 1;
1678         oidMin = oidsPerBlock * myIndexInHostArray;
1679         if (myIndexInHostArray == numHostsInSystem - 1)
1680                 oidMax = 0xFFFFFFFF;
1681         else
1682                 oidMax = oidsPerBlock * (myIndexInHostArray + 1) - 1;
1683
1684         return 0;
1685 }
1686
1687 void addHost(unsigned int hostIp)
1688 {
1689         unsigned int *tmpArray;
1690
1691         if (findHost(hostIp) != -1)
1692                 return;
1693
1694         if (numHostsInSystem == sizeOfHostArray)
1695         {
1696                 tmpArray = calloc(sizeOfHostArray * 2, sizeof(unsigned int));
1697                 memcpy(tmpArray, hostIpAddrs, sizeof(unsigned int) * numHostsInSystem);
1698                 free(hostIpAddrs);
1699                 hostIpAddrs = tmpArray;
1700         }
1701
1702         hostIpAddrs[numHostsInSystem++] = hostIp;
1703
1704         return;
1705 }
1706
1707 int findHost(unsigned int hostIp)
1708 {
1709         int i;
1710         for (i = 0; i < numHostsInSystem; i++)
1711                 if (hostIpAddrs[i] == hostIp)
1712                         return i;
1713
1714         //not found
1715         return -1;
1716 }
1717
1718 /* This function sends notification request per thread waiting on object(s) whose version
1719  * changes */
1720 int reqNotify(unsigned int *oidarry, unsigned short *versionarry, unsigned int numoid) {
1721         int sock,i;
1722         objheader_t *objheader;
1723         struct sockaddr_in remoteAddr;
1724         char msg[1 + numoid * (sizeof(unsigned short) + sizeof(unsigned int)) +  3 * sizeof(unsigned int)];
1725         char *ptr;
1726         int bytesSent;
1727         int status, size;
1728         unsigned short version;
1729         unsigned int oid,mid;
1730         static unsigned int threadid = 0;
1731         pthread_mutex_t threadnotify = PTHREAD_MUTEX_INITIALIZER; //Lock and condition var for threadjoin and notification
1732         pthread_cond_t threadcond = PTHREAD_COND_INITIALIZER;
1733         notifydata_t *ndata;
1734
1735         //FIXME currently all oids belong to one machine
1736         oid = oidarry[0];
1737         if((mid = lhashSearch(oid)) == 0) {
1738                 printf("Error: %s() No such machine found for oid =%x\n",__func__, oid);
1739                 return;
1740         }
1741
1742         if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0){
1743                 perror("reqNotify():socket()");
1744                 return -1;
1745         }
1746
1747         bzero(&remoteAddr, sizeof(remoteAddr));
1748         remoteAddr.sin_family = AF_INET;
1749         remoteAddr.sin_port = htons(LISTEN_PORT);
1750         remoteAddr.sin_addr.s_addr = htonl(mid);
1751
1752         /* Generate unique threadid */
1753         threadid++;
1754
1755         /* Save threadid, numoid, oidarray, versionarray, pthread_cond_variable for later processing */
1756         if((ndata = calloc(1, sizeof(notifydata_t))) == NULL) {
1757                 printf("Calloc Error %s, %d\n", __FILE__, __LINE__);
1758                 return -1;
1759         }
1760         ndata->numoid = numoid;
1761         ndata->threadid = threadid;
1762         ndata->oidarry = oidarry;
1763         ndata->versionarry = versionarry;
1764         ndata->threadcond = threadcond;
1765         ndata->threadnotify = threadnotify;
1766         if((status = notifyhashInsert(threadid, ndata)) != 0) {
1767                 printf("reqNotify(): Insert into notify hash table not successful %s, %d\n", __FILE__, __LINE__);
1768                 free(ndata);
1769                 return -1;
1770         }
1771
1772         /* Send  number of oids, oidarry, version array, machine id and threadid */
1773         if (connect(sock, (struct sockaddr *)&remoteAddr, sizeof(remoteAddr)) < 0){
1774                 printf("reqNotify():error %d connecting to %s:%d\n", errno,
1775                                 inet_ntoa(remoteAddr.sin_addr), LISTEN_PORT);
1776                 free(ndata);
1777                 return -1;
1778         } else {
1779                 msg[0] = THREAD_NOTIFY_REQUEST;
1780                 *((unsigned int *)(&msg[1])) = numoid;
1781                 /* Send array of oids  */
1782                 size = sizeof(unsigned int);
1783                 {
1784                         i = 0;
1785                         while(i < numoid) {
1786                                 oid = oidarry[i];
1787                                 *((unsigned int *)(&msg[1] + size)) = oid;
1788                                 size += sizeof(unsigned int);
1789                                 i++;
1790                         }
1791                 }
1792
1793                 /* Send array of version  */
1794                 {
1795                         i = 0;
1796                         while(i < numoid) {
1797                                 version = versionarry[i];
1798                                 *((unsigned short *)(&msg[1] + size)) = version;
1799                                 size += sizeof(unsigned short);
1800                                 i++;
1801                         }
1802                 }
1803
1804                 *((unsigned int *)(&msg[1] + size)) = myIpAddr;
1805                 size += sizeof(unsigned int);
1806                 *((unsigned int *)(&msg[1] + size)) = threadid;
1807
1808                 pthread_mutex_lock(&(ndata->threadnotify));
1809                 size = 1 + numoid * (sizeof(unsigned int) + sizeof(unsigned short)) + 3 * sizeof(unsigned int);
1810                 send_data(sock, msg, size);
1811                 pthread_cond_wait(&(ndata->threadcond), &(ndata->threadnotify));
1812                 pthread_mutex_unlock(&(ndata->threadnotify));
1813         }
1814
1815         pthread_cond_destroy(&threadcond);
1816         pthread_mutex_destroy(&threadnotify);
1817         free(ndata);
1818         close(sock);
1819         return status;
1820 }
1821
1822 void threadNotify(unsigned int oid, unsigned short version, unsigned int tid) {
1823         notifydata_t *ndata;
1824         int i, objIsFound = 0, index;
1825         void *ptr;
1826
1827         //Look up the tid and call the corresponding pthread_cond_signal
1828         if((ndata = notifyhashSearch(tid)) == NULL) {
1829                 printf("threadnotify(): No such threadid is present %s, %d\n", __FILE__, __LINE__);
1830                 return;
1831         } else  {
1832                 for(i = 0; i < ndata->numoid; i++) {
1833                         if(ndata->oidarry[i] == oid){
1834                                 objIsFound = 1;
1835                                 index = i;
1836                         }
1837                 }
1838                 if(objIsFound == 0){
1839                         printf("threadNotify(): Oid not found %s, %d\n", __FILE__, __LINE__);
1840                         return;
1841                 } else {
1842                         if(version <= ndata->versionarry[index]){
1843                                 printf("threadNotify(): New version %d has not changed since last version %s, %d\n", version, __FILE__, __LINE__);
1844                                 return;
1845                         } else {
1846                                 /* Clear from prefetch cache and free thread related data structure */
1847                                 if((ptr = prehashSearch(oid)) != NULL) {
1848                                         prehashRemove(oid);
1849                                 }
1850                                 pthread_cond_signal(&(ndata->threadcond));
1851                         }
1852                 }
1853         }
1854         return;
1855 }
1856
1857 int notifyAll(threadlist_t **head, unsigned int oid, unsigned int version) {
1858         threadlist_t *ptr;
1859         unsigned int mid;
1860         struct sockaddr_in remoteAddr;
1861         char msg[1 + sizeof(unsigned short) + 2*sizeof(unsigned int)];
1862         int sock, status, size, bytesSent;
1863
1864         while(*head != NULL) {
1865                 ptr = *head;
1866                 mid = ptr->mid;
1867                 //create a socket connection to that machine
1868                 if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0){
1869                         perror("notifyAll():socket()");
1870                         return -1;
1871                 }
1872
1873                 bzero(&remoteAddr, sizeof(remoteAddr));
1874                 remoteAddr.sin_family = AF_INET;
1875                 remoteAddr.sin_port = htons(LISTEN_PORT);
1876                 remoteAddr.sin_addr.s_addr = htonl(mid);
1877                 //send Thread Notify response and threadid to that machine
1878                 if (connect(sock, (struct sockaddr *)&remoteAddr, sizeof(remoteAddr)) < 0){
1879                         printf("notifyAll():error %d connecting to %s:%d\n", errno,
1880                                         inet_ntoa(remoteAddr.sin_addr), LISTEN_PORT);
1881                         status = -1;
1882                 } else {
1883                         bzero(msg, (1+sizeof(unsigned short) + 2*sizeof(unsigned int)));
1884                         msg[0] = THREAD_NOTIFY_RESPONSE;
1885                         *((unsigned int *)&msg[1]) = oid;
1886                         size = sizeof(unsigned int);
1887                         *((unsigned short *)(&msg[1]+ size)) = version;
1888                         size+= sizeof(unsigned short);
1889                         *((unsigned int *)(&msg[1]+ size)) = ptr->threadid;
1890
1891                         size = 1 + 2*sizeof(unsigned int) + sizeof(unsigned short);
1892                         send_data(sock, msg, size);
1893                 }
1894                 //close socket
1895                 close(sock);
1896                 // Update head
1897                 *head = ptr->next;
1898                 free(ptr);
1899         }
1900         return status;
1901 }
1902
1903 void transAbort(transrecord_t *trans) {
1904         objstrDelete(trans->cache);
1905         chashDelete(trans->lookupTable);
1906         free(trans);
1907 }