+/* Coordinator => Machine that initiates the transaction request call for commiting a transaction
+ * Participant => Machines that host the objects involved in a transaction commit */
+
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <netdb.h>
#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
#include "dstm.h"
#include "mlookup.h"
#include "llookup.h"
+#include "threadnotify.h"
+#ifdef COMPILER
+#include "thread.h"
+#endif
+
#define LISTEN_PORT 2156
#define BACKLOG 10 //max pending connections
#define RECEIVE_BUFFER_SIZE 2048
+#define PRE_BUF_SIZE 2048
extern int classsize[];
objstr_t *mainobjstore;
+pthread_mutex_t mainobjstore_mutex;
+pthread_mutexattr_t mainobjstore_mutex_attr; /* Attribute for lock to make it a recursive lock */
+pthread_mutex_t threadnotify_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+/* This function initializes the main objects store and creates the
+ * global machine and location lookup table */
int dstmInit(void)
{
- //Initialize main object store
- mainobjstore = objstrCreate(DEFAULT_OBJ_STORE_SIZE);
+ mainobjstore = objstrCreate(DEFAULT_OBJ_STORE_SIZE);
+ /* Initialize attribute for mutex */
+ pthread_mutexattr_init(&mainobjstore_mutex_attr);
+ pthread_mutexattr_settype(&mainobjstore_mutex_attr, PTHREAD_MUTEX_RECURSIVE_NP);
+ pthread_mutex_init(&mainobjstore_mutex, &mainobjstore_mutex_attr);
if (mhashCreate(HASH_SIZE, LOADFACTOR))
return 1; //failure
if (lhashCreate(HASH_SIZE, LOADFACTOR))
return 1; //failure
-
- //pthread_t threadListen;
- //pthread_create(&threadListen, NULL, dstmListen, NULL);
+
+ if (notifyhashCreate(N_HASH_SIZE, N_LOADFACTOR))
+ return 1; //failure
return 0;
}
+/* This function starts the thread to listen on a socket
+ * for tranaction calls */
void *dstmListen()
{
int listenfd, acceptfd;
socklen_t addrlength = sizeof(struct sockaddr);
pthread_t thread_dstm_accept;
int i;
+ int setsockflag=1;
listenfd = socket(AF_INET, SOCK_STREAM, 0);
if (listenfd == -1)
exit(1);
}
+ if (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &setsockflag, sizeof (setsockflag)) < 0) {
+ perror("socket");
+ exit(1);
+ }
+#ifdef MAC
+ if (setsockopt(listenfd, SOL_SOCKET, SO_NOSIGPIPE, &setsockflag, sizeof (setsockflag)) < 0) {
+ perror("socket");
+ exit(1);
+ }
+#endif
+
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(LISTEN_PORT);
my_addr.sin_addr.s_addr = INADDR_ANY;
printf("Listening on port %d, fd = %d\n", LISTEN_PORT, listenfd);
while(1)
{
- acceptfd = accept(listenfd, (struct sockaddr *)&client_addr, &addrlength);
- pthread_create(&thread_dstm_accept, NULL, dstmAccept, (void *)acceptfd);
+ int retval;
+ acceptfd = accept(listenfd, (struct sockaddr *)&client_addr, &addrlength);
+ do {
+ retval=pthread_create(&thread_dstm_accept, NULL, dstmAccept, (void *)acceptfd);
+ } while(retval!=0);
+ pthread_detach(thread_dstm_accept);
}
- pthread_exit(NULL);
}
-
+/* This function accepts a new connection request, decodes the control message in the connection
+ * and accordingly calls other functions to process new requests */
void *dstmAccept(void *acceptfd)
{
- int numbytes,i, val, retval;
+ int val, retval, size;
unsigned int oid;
char buffer[RECEIVE_BUFFER_SIZE], control,ctrl;
char *ptr;
void *srcObj;
objheader_t *h;
trans_commit_data_t transinfo;
+ unsigned short objType, *versionarry, version;
+ unsigned int *oidarry, numoid, mid, threadid;
- int fd_flags = fcntl((int)acceptfd, F_GETFD), size;
+ int i;
+
+ transinfo.objlocked = NULL;
+ transinfo.objnotfound = NULL;
+ transinfo.modptr = NULL;
+ transinfo.numlocked = 0;
+ transinfo.numnotfound = 0;
- printf("Recieved connection: fd = %d\n", (int)acceptfd);
+ /* Receive control messages from other machines */
if((retval = recv((int)acceptfd, &control, sizeof(char), 0)) <= 0) {
- perror("Error in receiving control from coordinator\n");
- return;
+ perror("Error: in receiving control from coordinator\n");
+ pthread_exit(NULL);
}
+
switch(control) {
case READ_REQUEST:
- printf("DEBUG -> Recv READ_REQUEST from Coordinator\n");
+ /* Read oid requested and search if available */
if((retval = recv((int)acceptfd, &oid, sizeof(unsigned int), 0)) <= 0) {
- perror("Error receiving object from cooridnator\n");
- return;
+ perror("Error: receiving 0x0 object from cooridnator\n");
+ pthread_exit(NULL);
+ }
+ if((srcObj = mhashSearch(oid)) == NULL) {
+ printf("Error: Object 0x%x is not found in Main Object Store %s, %d\n", oid, __FILE__, __LINE__);
+ pthread_exit(NULL);
}
- srcObj = mhashSearch(oid);
h = (objheader_t *) srcObj;
- size = sizeof(objheader_t) + sizeof(classsize[h->type]);
+ GETSIZE(size, h);
+ size += sizeof(objheader_t);
+
if (h == NULL) {
ctrl = OBJECT_NOT_FOUND;
- if(send((int)acceptfd, &ctrl, sizeof(char), 0) < 0) {
+ if(send((int)acceptfd, &ctrl, sizeof(char), MSG_NOSIGNAL) < sizeof(char)) {
perror("Error sending control msg to coordinator\n");
+ pthread_exit(NULL);
}
} else {
- //char responsemessage[sizeof(char)+sizeof(int)];
/* Type */
- ctrl = OBJECT_FOUND;
- if(send((int)acceptfd, &ctrl, sizeof(char), 0) < 0) {
- perror("Error sending control msg to coordinator\n");
- }
-
- //responsemessage[0]=OBJECT_FOUND;
- /* Size of object */
- //*((int *)(&responsemessage[1])) = sizeof(objheader_t) + classsize[h->type];
- //if(send((int)acceptfd, &responsemessage, sizeof(responsemessage), 0) < 0) {
- // perror("Error sending control msg to coordinator\n");
- //}
-
- /* Size of object */
- if(send((int)acceptfd, &size, sizeof(int), 0) < 0) {
+ char msg[]={OBJECT_FOUND, 0, 0, 0, 0};
+ *((int *)&msg[1])=size;
+ if(send((int)acceptfd, &msg, sizeof(msg), MSG_NOSIGNAL) < sizeof(msg)) {
perror("Error sending size of object to coordinator\n");
+ pthread_exit(NULL);
}
- if(send((int)acceptfd, h, size, 0) < 0) {
+ if(send((int)acceptfd, h, size, MSG_NOSIGNAL) < size) {
perror("Error in sending object\n");
+ pthread_exit(NULL);
}
}
break;
case READ_MULT_REQUEST:
- printf("DEBUG-> READ_MULT_REQUEST\n");
break;
case MOVE_REQUEST:
- printf("DEBUG -> MOVE_REQUEST\n");
break;
case MOVE_MULT_REQUEST:
- printf("DEBUG -> MOVE_MULT_REQUEST\n");
break;
case TRANS_REQUEST:
- printf("DEBUG -> Recv TRANS_REQUEST from Coordinator\n");
- if((val = readClientReq((int)acceptfd, &transinfo)) != 0) {
- printf("Error in readClientReq\n");
+ /* Read transaction request */
+ if((val = readClientReq(&transinfo, (int)acceptfd)) != 0) {
+ printf("Error: In readClientReq() %s, %d\n", __FILE__, __LINE__);
+ pthread_exit(NULL);
}
break;
+ case TRANS_PREFETCH:
+ if((val = prefetchReq((int)acceptfd)) != 0) {
+ printf("Error: In prefetchReq() %s, %d\n", __FILE__, __LINE__);
+ pthread_exit(NULL);
+ }
+ break;
+ case START_REMOTE_THREAD:
+ retval = recv((int)acceptfd, &oid, sizeof(unsigned int), 0);
+ if (retval <= 0)
+ perror("dstmAccept(): error receiving START_REMOTE_THREAD msg");
+ else if (retval != sizeof(unsigned int))
+ printf("dstmAccept(): incorrect msg size %d for START_REMOTE_THREAD %s, %d\n",
+ retval, __FILE__, __LINE__);
+ else
+ {
+ objType = getObjType(oid);
+ startDSMthread(oid, objType);
+ }
+ break;
+
+ case THREAD_NOTIFY_REQUEST:
+ size = sizeof(unsigned int);
+ bzero(&buffer, RECEIVE_BUFFER_SIZE);
+ retval = recv((int)acceptfd, &buffer, size, 0);
+ numoid = *((unsigned int *) &buffer);
+ size = (sizeof(unsigned int) + sizeof(unsigned short)) * numoid + 2 * sizeof(unsigned int);
+ bzero(&buffer, RECEIVE_BUFFER_SIZE);
+ retval = recv((int)acceptfd, &buffer, size, 0);
+ if(retval <=0)
+ perror("dstmAccept(): error receiving THREAD_NOTIFY_REQUEST");
+ else if( retval != (2* sizeof(unsigned int) + (sizeof(unsigned int) + sizeof(unsigned short)) * numoid))
+ printf("dstmAccept(): incorrect msg size %d for THREAD_NOTIFY_REQUEST %s, %d\n", retval,
+ __FILE__, __LINE__);
+ else {
+ oidarry = calloc(numoid, sizeof(unsigned int));
+ memcpy(oidarry, buffer, sizeof(unsigned int) * numoid);
+ size = sizeof(unsigned int) * numoid;
+ versionarry = calloc(numoid, sizeof(unsigned short));
+ memcpy(versionarry, buffer+size, sizeof(unsigned short) * numoid);
+ size += sizeof(unsigned short) * numoid;
+ mid = *((unsigned int *)(buffer+size));
+ size += sizeof(unsigned int);
+ threadid = *((unsigned int *)(buffer+size));
+ processReqNotify(numoid, oidarry, versionarry, mid, threadid);
+ }
+
+ break;
+
+ case THREAD_NOTIFY_RESPONSE:
+ size = sizeof(unsigned short) + 2 * sizeof(unsigned int);
+ bzero(&buffer, RECEIVE_BUFFER_SIZE);
+ retval = recv((int)acceptfd, &buffer, size, 0);
+ if(retval <= 0)
+ perror("dstmAccept(): error receiving THREAD_NOTIFY_RESPONSE");
+ else if( retval != 2*sizeof(unsigned int) + sizeof(unsigned short))
+ printf("dstmAccept(): incorrect msg size %d for THREAD_NOTIFY_RESPONSE msg %s, %d\n",
+ retval, __FILE__, __LINE__);
+ else {
+ oid = *((unsigned int *)buffer);
+ size = sizeof(unsigned int);
+ version = *((unsigned short *)(buffer+size));
+ size += sizeof(unsigned short);
+ threadid = *((unsigned int *)(buffer+size));
+ threadNotify(oid,version,threadid);
+ }
+
+ break;
default:
- printf("DEBUG -> dstmAccept: Error Unknown opcode %d\n", control);
+ printf("Error: dstmAccept() Unknown opcode %d at %s, %d\n", control, __FILE__, __LINE__);
}
+
+ /* Close connection */
if (close((int)acceptfd) == -1)
- {
perror("close");
- }
- else
- printf("Closed connection: fd = %d\n", (int)acceptfd);
- //Free memory
- free(transinfo.objmod);
- free(transinfo.objlocked);
- free(transinfo.objnotfound);
pthread_exit(NULL);
}
-int readClientReq(int acceptfd, trans_commit_data_t *transinfo) {
- char *ptr, control, prevctrl, sendctrl, newctrl;
- void *modptr, *header;
- objheader_t *tmp_header;
+/* This function reads the information available in a transaction request
+ * and makes a function call to process the request */
+int readClientReq(trans_commit_data_t *transinfo, int acceptfd) {
+ char *ptr;
+ void *modptr;
+ unsigned int *oidmod, oid;
fixed_data_t fixed;
- int sum = 0, i, N, n, val, retval;
+ objheader_t *headaddr;
+ int sum = 0, i, N, n, val;
+
+ oidmod = NULL;
- //Reads to process the TRANS_REQUEST protocol further
- // Read fixed_data
+ /* Read fixed_data_t data structure */
N = sizeof(fixed) - 1;
ptr = (char *)&fixed;;
fixed.control = TRANS_REQUEST;
do {
n = recv((int)acceptfd, (void *) ptr+1+sum, N-sum, 0);
- // printf("DEBUG -> 1. Reading %d bytes \n", n);
sum += n;
} while(sum < N && n != 0);
- //printf("Machine count = %d\tnumread = %d\tnummod = %d\tsum_bytes = %d\n", fixed.mcount, fixed.numread, fixed.nummod, fixed.sum_bytes);
- // Read list of mids
+ /* Read list of mids */
int mcount = fixed.mcount;
N = mcount * sizeof(unsigned int);
unsigned int listmid[mcount];
sum = 0;
do {
n = recv((int)acceptfd, (void *) ptr+sum, N-sum, 0);
- // printf("DEBUG -> 2. Reading %d bytes cap = %d\n", n, N);
sum += n;
} while(sum < N && n != 0);
- // Read oid and version tuples
+ /* Read oid and version tuples for those objects that are not modified in the transaction */
int numread = fixed.numread;
N = numread * (sizeof(unsigned int) + sizeof(short));
char objread[N];
- if(numread != 0) { // If pile contains objects to be read
- // N = numread * (sizeof(unsigned int) + sizeof(short));
- // char objread[N];
+ if(numread != 0) { //If pile contains more than one object to be read,
+ // keep reading all objects
sum = 0;
do {
n = recv((int)acceptfd, (void *) objread, N, 0);
- // printf("DEBUG -> 3. Reading %d bytes cap = %d\n", n, N);
sum += n;
} while(sum < N && n != 0);
-// printf("DEBUG -> Recv objs from Coordinator %d %d %d %d\n", *objread, *(objread + 6), *(objread + 12), *(objread + 18));
}
- // Read modified objects
- if(fixed.nummod != 0) { // If pile contains modified objects
- if ((modptr = objstrAlloc(mainobjstore, fixed.sum_bytes)) == NULL) {
- printf("objstrAlloc error for modified objects %s, %d", __FILE__, __LINE__);
+ /* Read modified objects */
+ if(fixed.nummod != 0) {
+ if ((modptr = calloc(1, fixed.sum_bytes)) == NULL) {
+ printf("calloc error for modified objects %s, %d\n", __FILE__, __LINE__);
return 1;
}
sum = 0;
- do { // Recv the objs that are modified at Coordinator
- n = recv((int)acceptfd, modptr+sum, fixed.sum_bytes-sum, 0);
- // printf("DEBUG -> 4. Reading %d bytes cap = %d, oid = %d\n", n, fixed.sum_bytes, *((int *)modptr));
+ do { // Recv the objs that are modified by the Coordinator
+ n = recv((int)acceptfd, (char *) modptr+sum, fixed.sum_bytes-sum, 0);
sum += n;
} while (sum < fixed.sum_bytes && n != 0);
}
- //Send control message as per all votes from all oids in the machine
- if((prevctrl = handleTransReq(acceptfd, &fixed, transinfo, listmid, objread, modptr)) == 0 ) {
- printf("Handle req error\n");
+ /* Create an array of oids for modified objects */
+ oidmod = (unsigned int *) calloc(fixed.nummod, sizeof(unsigned int));
+ if (oidmod == NULL)
+ {
+ printf("calloc error %s, %d\n", __FILE__, __LINE__);
+ return 1;
+ }
+ ptr = (char *) modptr;
+ for(i = 0 ; i < fixed.nummod; i++) {
+ int tmpsize;
+ headaddr = (objheader_t *) ptr;
+ oid = OID(headaddr);
+ oidmod[i] = oid;
+ GETSIZE(tmpsize, headaddr);
+ ptr += sizeof(objheader_t) + tmpsize;
+ }
+
+ /*Process the information read */
+ if((val = processClientReq(&fixed, transinfo, listmid, objread, modptr, oidmod, acceptfd)) != 0) {
+ printf("Error: In processClientReq() %s, %d\n", __FILE__, __LINE__);
+ /* Free resources */
+ if(oidmod != NULL) {
+ free(oidmod);
+ }
+ return 1;
+ }
+
+ /* Free resources */
+ if(oidmod != NULL) {
+ free(oidmod);
}
- //Read for new control message from Coordiator
- if((retval = recv((int)acceptfd, &control, sizeof(char), 0)) <= 0 ) {
- perror("Error in receiving control message");
+ return 0;
+}
+
+/* This function processes the Coordinator's transaction request using "handleTransReq"
+ * function and sends a reply to the co-ordinator.
+ * Following this it also receives a new control message from the co-ordinator and processes this message*/
+int processClientReq(fixed_data_t *fixed, trans_commit_data_t *transinfo,
+ unsigned int *listmid, char *objread, void *modptr, unsigned int *oidmod, int acceptfd) {
+ char control, sendctrl, retval;
+ objheader_t *tmp_header;
+ void *header;
+ int i = 0, val;
+
+ /* Send reply to the Coordinator */
+ if((retval = handleTransReq(fixed, transinfo, listmid, objread, modptr,acceptfd)) == 0 ) {
+ printf("Error: In handleTransReq() %s, %d\n", __FILE__, __LINE__);
return 1;
}
+ do {
+ retval = recv((int)acceptfd, &control, sizeof(char), 0);
+ } while(retval < sizeof(char));
+
+ /* Process the new control message */
switch(control) {
case TRANS_ABORT:
- printf("DEBUG -> Recv TRANS_ABORT from Coordinator\n");
- //send ack to coordinator
- sendctrl = TRANS_SUCESSFUL;
- if(send((int)acceptfd, &sendctrl, sizeof(char), 0) < 0) {
- perror("Error sending ACK to coordinator\n");
- return 1;
- }
- //Mark all ref counts as 1 and do garbage collection
- ptr = modptr;
- for(i = 0; i< fixed.nummod; i++) {
- tmp_header = (objheader_t *)ptr;
- tmp_header->rcount = 1;
- ptr += sizeof(objheader_t) + classsize[tmp_header->type];
- }
- //Unlock objects that was locked in this machine due to this transaction
+ if (fixed->nummod > 0)
+ free(modptr);
+ /* Unlock objects that was locked due to this transaction */
for(i = 0; i< transinfo->numlocked; i++) {
- header = mhashSearch(transinfo->objlocked[i]);// find the header address
- ((objheader_t *)header)->status &= ~(LOCK);
+ if((header = mhashSearch(transinfo->objlocked[i])) == NULL) {
+ printf("mhashSearch returns NULL at %s, %d\n", __FILE__, __LINE__);// find the header address
+ return 1;
+ }
+ STATUS(((objheader_t *)header)) &= ~(LOCK);
}
- ptr = NULL;
- return 0;
- case TRANS_COMMIT:
- printf("DEBUG -> Recv TRANS_COMMIT from Coordinator\n");
- if((val = transCommitProcess(transinfo, (int)acceptfd)) != 0) {
- printf("Error in transCommitProcess %s, %d\n", __FILE__, __LINE__);
+ /* Send ack to Coordinator */
+ sendctrl = TRANS_UNSUCESSFUL;
+ if(send((int)acceptfd, &sendctrl, sizeof(char), MSG_NOSIGNAL) < sizeof(char)) {
+ perror("Error: In sending ACK to coordinator\n");
+ if (transinfo->objlocked != NULL) {
+ free(transinfo->objlocked);
+ }
+ if (transinfo->objnotfound != NULL) {
+ free(transinfo->objnotfound);
+ }
+
+ return 1;
}
break;
- case TRANS_ABORT_BUT_RETRY_COMMIT:
- printf("DEBUG -> Recv TRANS_ABORT_BUT_RETRY_COMMIT from Coordinator\n");
- //Process again after waiting for sometime and on prev control message sent
- switch(prevctrl) {
- case TRANS_AGREE:
- sendctrl = TRANS_AGREE;
- if(send((int)acceptfd, &sendctrl, sizeof(char), 0) < 0) {
- perror("Error sending ACK to coordinator\n");
- }
- sleep(5);
- break;
- case TRANS_SOFT_ABORT:
- if((newctrl = handleTransReq(acceptfd, &fixed, transinfo, listmid, objread, modptr)) == 0 ) {
- printf("Handle req error\n");
- }
- if(newctrl == prevctrl){
- //Send ABORT
- newctrl = TRANS_DISAGREE;
- if(send((int)acceptfd, &newctrl, sizeof(char), 0) < 0) {
- perror("Error sending ACK to coordinator\n");
- }
- //Set the reference count of the object to 1 in mainstore for garbage collection
- ptr = modptr;
- for(i = 0; i< fixed.nummod; i++) {
- tmp_header = (objheader_t *) ptr;
- tmp_header->rcount = 1;
- ptr += sizeof(objheader_t) + classsize[tmp_header->type];
- }
- //Unlock objects that was locked in this machine due to this transaction
- for(i = 0; i< transinfo->numlocked; i++) {
- ptr = mhashSearch(transinfo->objlocked[i]);// find the header address
- ((objheader_t *)ptr)->status &= ~(LOCK);
- }
- return 0;
- } else {
- //Send new control message
- if(send((int)acceptfd, &newctrl, sizeof(char), 0) < 0) {
- perror("Error sending ACK to coordinator\n");
- }
- }
- break;
+ case TRANS_COMMIT:
+ /* Invoke the transCommit process() */
+ if((val = transCommitProcess(modptr, oidmod, transinfo->objlocked, fixed->nummod, transinfo->numlocked, (int)acceptfd)) != 0) {
+ printf("Error: In transCommitProcess() %s, %d\n", __FILE__, __LINE__);
+ /* Free memory */
+ if (transinfo->objlocked != NULL) {
+ free(transinfo->objlocked);
+ }
+ if (transinfo->objnotfound != NULL) {
+ free(transinfo->objnotfound);
+ }
+ return 1;
}
-
break;
+
case TRANS_ABORT_BUT_RETRY_COMMIT_WITH_RELOCATING:
- //TODO expect another transrequest from client
- printf("DEBUG -> Recv TRANS_ABORT_BUT_RETRY_COMMIT_WITH_RELOCATING from Coordinator\n");
break;
default:
- printf("No response to TRANS_AGREE OR DISAGREE protocol\n");
+ printf("Error: No response to TRANS_AGREE OR DISAGREE protocol %s, %d\n", __FILE__, __LINE__);
//TODO Use fixed.trans_id TID since Client may have died
break;
}
+ /* Free memory */
+ if (transinfo->objlocked != NULL) {
+ free(transinfo->objlocked);
+ }
+ if (transinfo->objnotfound != NULL) {
+ free(transinfo->objnotfound);
+ }
+
return 0;
}
-//This function runs a decision after all objects are weighed under one of the 4 possibilities
-//and returns the appropriate control message to the Ccordinator
-char handleTransReq(int acceptfd, fixed_data_t *fixed, trans_commit_data_t *transinfo, unsigned int *listmid, char *objread, void *modptr) {
- int val;
- short version;
- char control = 0, ctrlmissoid, *ptr;
- int i, j = 0;
+/* This function increments counters while running a voting decision on all objects involved
+ * in TRANS_REQUEST and If a TRANS_DISAGREE sends the response immediately back to the coordinator */
+char handleTransReq(fixed_data_t *fixed, trans_commit_data_t *transinfo, unsigned int *listmid, char *objread, void *modptr, int acceptfd) {
+ int val, i = 0, j;
+ unsigned short version;
+ char control = 0, *ptr;
unsigned int oid;
- unsigned int *oidnotfound, *oidlocked, *oidmod;
+ unsigned int *oidnotfound, *oidlocked;
+ void *mobj;
+ objheader_t *headptr;
+ /* Counters and arrays to formulate decision on control message to be sent */
oidnotfound = (unsigned int *) calloc(fixed->numread + fixed->nummod, sizeof(unsigned int));
oidlocked = (unsigned int *) calloc(fixed->numread + fixed->nummod, sizeof(unsigned int));
- oidmod = (unsigned int *) calloc(fixed->nummod, sizeof(unsigned int));
+ int objnotfound = 0, objlocked = 0;
+ int v_nomatch = 0, v_matchlock = 0, v_matchnolock = 0;
- // Counters and arrays to formulate decision on control message to be sent
- int objnotfound = 0, objlocked = 0, objmod =0, v_nomatch = 0, v_matchlock = 0, v_matchnolock = 0;
- int objmodnotfound = 0, nummodfound = 0;
- void *mobj;
- objheader_t *headptr;
+ /* modptr points to the beginning of the object store
+ * created at the Pariticipant.
+ * Object store holds the modified objects involved in the transaction request */
+ ptr = (char *) modptr;
- //Process each object present in the pile
- ptr = modptr;
- //printf("DEBUG -> Total objs involved in trans is %d\n",fixed->nummod + fixed->numread);
- fflush(stdout);
- //Process each oid in the machine pile/ group
+ /* Process each oid in the machine pile/ group per thread */
for (i = 0; i < fixed->numread + fixed->nummod; i++) {
- if (i < fixed->numread) {//Object is read
+ if (i < fixed->numread) {//Objs only read and not modified
int incr = sizeof(unsigned int) + sizeof(short);// Offset that points to next position in the objread array
incr *= i;
oid = *((unsigned int *)(objread + incr));
incr += sizeof(unsigned int);
- version = *((short *)(objread + incr));
- } else {//Obj is modified
- headptr = (objheader_t *) ptr;
- oid = headptr->oid;
- oidmod[objmod] = oid;//Array containing modified oids
- objmod++;
- version = headptr->version;
- ptr += sizeof(objheader_t) + classsize[headptr->type];
+ version = *((unsigned short *)(objread + incr));
+ } else {//Objs modified
+ int tmpsize;
+ headptr = (objheader_t *) ptr;
+ oid = OID(headptr);
+ version = headptr->version;
+ GETSIZE(tmpsize, headptr);
+ ptr += sizeof(objheader_t) + tmpsize;
}
- //Check if object is still present in the machine since the beginning of TRANS_REQUEST
- if ((mobj = mhashSearch(oid)) == NULL) {// Obj not found
- //Save the oids not found for later use
- oidnotfound[objnotfound] = ((objheader_t *)mobj)->oid;
+
+ /* Check if object is still present in the machine since the beginning of TRANS_REQUEST */
+
+ if ((mobj = mhashSearch(oid)) == NULL) {/* Obj not found */
+ /* Save the oids not found and number of oids not found for later use */
+ oidnotfound[objnotfound] = oid;
objnotfound++;
- } else { // If obj found in machine (i.e. has not moved)
- //Check if obj is locked
- if ((((objheader_t *)mobj)->status & LOCK) == LOCK) {
- if (version == ((objheader_t *)mobj)->version) { // If version match
+ } else { /* If Obj found in machine (i.e. has not moved) */
+ /* Check if Obj is locked by any previous transaction */
+ if ((STATUS(((objheader_t *)mobj)) & LOCK) == LOCK) {
+ if (version == ((objheader_t *)mobj)->version) { /* If locked then match versions */
v_matchlock++;
- } else {//If versions don't match ..HARD ABORT
+ } else {/* If versions don't match ...HARD ABORT */
v_nomatch++;
- //send TRANS_DISAGREE to Coordinator
+ /* Send TRANS_DISAGREE to Coordinator */
control = TRANS_DISAGREE;
- if((val = write(acceptfd, &control, sizeof(char))) <= 0) {
+ if (objlocked > 0) {
+ for(j = 0; j < objlocked; j++) {
+ if((headptr = mhashSearch(oidlocked[j])) == NULL) {
+ printf("mhashSearch returns NULL at %s, %d\n", __FILE__, __LINE__);
+ return 0;
+ }
+ STATUS(headptr) &= ~(LOCK);
+ }
+ free(oidlocked);
+ }
+ if((val = send(acceptfd, &control, sizeof(char), MSG_NOSIGNAL)) < sizeof(char)) {
perror("Error in sending control to the Coordinator\n");
return 0;
}
- printf("DEBUG -> Sending TRANS_DISAGREE\n");
return control;
}
- } else {//Obj is not locked , so lock object
- ((objheader_t *)mobj)->status |= LOCK;
- //Save all object oids that are locked on this machine during this transaction request call
- oidlocked[objlocked] = ((objheader_t *)mobj)->oid;
+ } else {/* If Obj is not locked then lock object */
+ STATUS(((objheader_t *)mobj)) |= LOCK;
+ /* Save all object oids that are locked on this machine during this transaction request call */
+ oidlocked[objlocked] = OID(((objheader_t *)mobj));
objlocked++;
- if (version == ((objheader_t *)mobj)->version) { //If versions match
+ if (version == ((objheader_t *)mobj)->version) { /* Check if versions match */
v_matchnolock++;
- } else { //If versions don't match
+ } else { /* If versions don't match ...HARD ABORT */
v_nomatch++;
- //send TRANS_DISAGREE to Coordinator
control = TRANS_DISAGREE;
- if((val = write(acceptfd, &control, sizeof(char))) <= 0) {
+ if (objlocked > 0) {
+ for(j = 0; j < objlocked; j++) {
+ if((headptr = mhashSearch(oidlocked[j])) == NULL) {
+ printf("mhashSearch returns NULL at %s, %d\n", __FILE__, __LINE__);
+ return 0;
+ }
+ STATUS(headptr) &= ~(LOCK);
+ }
+ free(oidlocked);
+ }
+
+ /* Send TRANS_DISAGREE to Coordinator */
+ if((val = send(acceptfd, &control, sizeof(char), MSG_NOSIGNAL)) < sizeof(char)) {
perror("Error in sending control to the Coordinator\n");
return 0;
}
- printf("DEBUG -> Sending TRANS_DISAGREE\n");
+
return control;
}
}
}
}
+
+ /* Decide what control message to send to Coordinator */
+ if ((control = decideCtrlMessage(fixed, transinfo, &v_matchnolock, &v_matchlock, &v_nomatch, &objnotfound, &objlocked,
+ modptr, oidnotfound, oidlocked, acceptfd)) == 0) {
+ printf("Error: In decideCtrlMessage() %s, %d\n", __FILE__, __LINE__);
+ return 0;
+ }
+
+ return control;
- //printf("No of objs locked = %d\n", objlocked);
- //printf("No of v_nomatch = %d\n", v_nomatch);
- //printf("No of objs v_match but are did not have locks before = %d\n", v_matchnolock);
- //printf("No of objs v_match but had locks before = %d\n", v_matchlock);
- //printf("No of objs not found = %d\n", objnotfound);
- //printf("No of objs modified but not found = %d\n", objmodnotfound);
+}
+/* This function decides what control message such as TRANS_AGREE, TRANS_DISAGREE or TRANS_SOFT_ABORT
+ * to send to Coordinator based on the votes of oids involved in the transaction */
+char decideCtrlMessage(fixed_data_t *fixed, trans_commit_data_t *transinfo, int *v_matchnolock, int *v_matchlock,
+ int *v_nomatch, int *objnotfound, int *objlocked, void *modptr,
+ unsigned int *oidnotfound, unsigned int *oidlocked, int acceptfd) {
+ int val;
+ char control = 0;
- //Decide what control message(s) to send
- if(v_matchnolock == fixed->numread + fixed->nummod) {
- //send TRANS_AGREE to Coordinator
+ /* Condition to send TRANS_AGREE */
+ if(*(v_matchnolock) == fixed->numread + fixed->nummod) {
control = TRANS_AGREE;
- if((val = write(acceptfd, &control, sizeof(char))) <= 0) {
+ /* Send control message */
+ if((val = send(acceptfd, &control, sizeof(char), MSG_NOSIGNAL)) < sizeof(char)) {
perror("Error in sending control to Coordinator\n");
return 0;
}
- printf("DEBUG -> Sending TRANS_AGREE\n");
}
-
- if((v_matchlock > 0 && v_nomatch == 0) || (objnotfound > 0 && v_nomatch == 0)) {
- //send TRANS_SOFT_ABORT to Coordinator
+ /* Condition to send TRANS_SOFT_ABORT */
+ if((*(v_matchlock) > 0 && *(v_nomatch) == 0) || (*(objnotfound) > 0 && *(v_nomatch) == 0)) {
control = TRANS_SOFT_ABORT;
- if((val = write(acceptfd, &control, sizeof(char))) <=0 ) {
- perror("Error in sending control back to coordinator\n");
- return 0;
- }
- printf("DEBUG -> Sending TRANS_SOFT_ABORT\n");
- //send number of oids not found and the missing oids
- if((val = write(acceptfd, &objnotfound, sizeof(int))) <= 0) {
- perror("Error in sending no of objects that are not found\n");
+
+ /* Send control message */
+ if((val = send(acceptfd, &control, sizeof(char),MSG_NOSIGNAL)) < sizeof(char)) {
+ perror("Error in sending TRANS_SOFT_ABORT control\n");
return 0;
}
- if(objnotfound != 0) {
- if((val = write(acceptfd, oidnotfound, (sizeof(unsigned int) * objnotfound))) <= 0) {
+
+ /* Send number of oids not found and the missing oids if objects are missing in the machine */
+ if(*(objnotfound) != 0) {
+ int msg[1];
+ msg[0] = *(objnotfound);
+ if((val = send(acceptfd, msg, sizeof(int) ,MSG_NOSIGNAL)) < sizeof(int)) {
+ perror("Error in sending objects that are not found\n");
+ return 0;
+ }
+ int size = sizeof(unsigned int)* *(objnotfound);
+ if((val = send(acceptfd, oidnotfound, size ,MSG_NOSIGNAL)) < size) {
perror("Error in sending objects that are not found\n");
return 0;
}
}
}
-
- //Do the following when TRANS_DISAGREE is sent
- if(control == TRANS_DISAGREE) {
- //Set the reference count of the object to 1 in mainstore for garbage collection
- ptr = modptr;
- for(i = 0; i< fixed->nummod; i++) {
- headptr = (objheader_t *) ptr;
- headptr->rcount = 1;
- ptr += sizeof(objheader_t) + classsize[headptr->type];
- }
- //Unlock objects that was locked in the trans
- for(i = 0; i< objlocked ; i++) {
- mobj = mhashSearch(oidlocked[i]);// find the header address
- ((objheader_t *)mobj)->status &= ~(LOCK);
- }
- }
-
- //Fill out the structure required for a trans commit process if pile receives a TRANS_COMMIT
- transinfo->objmod = oidmod;
+
+ /* Fill out the trans_commit_data_t data structure. This is required for a trans commit process
+ * if Participant receives a TRANS_COMMIT */
transinfo->objlocked = oidlocked;
transinfo->objnotfound = oidnotfound;
transinfo->modptr = modptr;
- transinfo->nummod = fixed->nummod;
- transinfo->numlocked = objlocked;
- transinfo->numnotfound = objnotfound;
+ transinfo->numlocked = *(objlocked);
+ transinfo->numnotfound = *(objnotfound);
return control;
}
-//Processes oids in the TRANS_COMMIT request at the participant end and sends an ack back
-int transCommitProcess(trans_commit_data_t *transinfo, int acceptfd) {
+/* This function processes all modified objects involved in a TRANS_COMMIT and updates pointer
+ * addresses in lookup table and also changes version number
+ * Sends an ACK back to Coordinator */
+int transCommitProcess(void *modptr, unsigned int *oidmod, unsigned int *oidlocked, int nummod, int numlocked, int acceptfd) {
objheader_t *header;
+ objheader_t *newheader;
int i = 0, offset = 0;
char control;
- //Process each modified object saved in the mainobject store
- for(i=0; i<transinfo->nummod; i++) {
- if((header = (objheader_t *) mhashSearch(transinfo->objmod[i])) == NULL) {
- printf("mhashserach returns NULL\n");
+ int tmpsize;
+
+ /* Process each modified object saved in the mainobject store */
+ for(i = 0; i < nummod; i++) {
+ if((header = (objheader_t *) mhashSearch(oidmod[i])) == NULL) {
+ printf("Error: mhashsearch returns NULL at %s, %d\n", __FILE__, __LINE__);
+ return 1;
}
- //change reference count of older address and free space in objstr ??
- header->rcount = 1; //Not sure what would be th val
- //change ptr address in mhash table
- mhashRemove(transinfo->objmod[i]);
- mhashInsert(transinfo->objmod[i], (transinfo->modptr + offset));
- offset += sizeof(objheader_t) + classsize[header->type];
- //update object version
- header = (objheader_t *) mhashSearch(transinfo->objmod[i]);
+ GETSIZE(tmpsize,header);
+ pthread_mutex_lock(&mainobjstore_mutex);
+ memcpy((char*)header + sizeof(objheader_t), ((char *)modptr + sizeof(objheader_t) + offset), tmpsize);
header->version += 1;
+ /* If threads are waiting on this object to be updated, notify them */
+ if(header->notifylist != NULL) {
+ notifyAll(&header->notifylist, OID(header), header->version);
+ }
+ pthread_mutex_unlock(&mainobjstore_mutex);
+ offset += sizeof(objheader_t) + tmpsize;
}
- for(i=0; i<transinfo->numlocked; i++) {
- //unlock objects
- header = (objheader_t *) mhashSearch(transinfo->objlocked[i]);
- header->status &= ~(LOCK);
- }
+ if (nummod > 0)
+ free(modptr);
+
+ /* Unlock locked objects */
+ for(i = 0; i < numlocked; i++) {
+ if((header = (objheader_t *) mhashSearch(oidlocked[i])) == NULL) {
+ printf("Error: mhashsearch returns NULL at %s, %d\n", __FILE__, __LINE__);
+ return 1;
+ }
+ STATUS(header) &= ~(LOCK);
+ }
//TODO Update location lookup table
- //send ack to coordinator
+ /* Send ack to coordinator */
control = TRANS_SUCESSFUL;
- if(send((int)acceptfd, &control, sizeof(char), 0) < 0) {
+ if(send((int)acceptfd, &control, sizeof(char), MSG_NOSIGNAL) < sizeof(char)) {
perror("Error sending ACK to coordinator\n");
+ return 1;
}
+
+ return 0;
+}
+/* This function recevies the oid and offset tuples from the Coordinator's prefetch call.
+ * Looks for the objects to be prefetched in the main object store.
+ * If objects are not found then record those and if objects are found
+ * then use offset values to prefetch references to other objects */
+
+int prefetchReq(int acceptfd) {
+ int i, length, sum, n, numbytes, numoffset, N, objnotfound = 0, size, count = 0;
+ int isArray = 0;
+ unsigned int oid, index = 0;
+ char *ptr, buffer[PRE_BUF_SIZE];
+ void *mobj;
+ unsigned int objoid;
+ char control;
+ objheader_t * header;
+ int bytesRecvd;
+
+ /* Repeatedly recv one oid and offset pair sent for prefetch */
+ while(numbytes = recv((int)acceptfd, &length, sizeof(int), 0) != 0) {
+ count++;
+ if(length == -1)
+ break;
+ index = 0;
+ bytesRecvd = 0;
+ do {
+ bytesRecvd += recv((int)acceptfd, (char *)&oid +bytesRecvd,
+ sizeof(unsigned int) - bytesRecvd, 0);
+ } while (bytesRecvd < sizeof(unsigned int));
+ numoffset = (length - (sizeof(int) + sizeof(unsigned int)))/ sizeof(short);
+ N = numoffset * sizeof(short);
+ short offset[numoffset];
+ ptr = (char *)&offset;
+ sum = 0;
+ /* Recv the offset values per oid */
+ do {
+ n = recv((int)acceptfd, (void *)ptr+sum, N-sum, 0);
+ sum += n;
+ } while(sum < N && n != 0);
+
+ bzero(&buffer, PRE_BUF_SIZE);
+ /* Process each oid */
+ if ((mobj = mhashSearch(oid)) == NULL) {/* Obj not found */
+ /* Save the oids not found in buffer for later use */
+ *(buffer + index) = OBJECT_NOT_FOUND;
+ index += sizeof(char);
+ *((unsigned int *)(buffer+index)) = oid;
+ index += sizeof(unsigned int);
+ } else { /* If Obj found in machine (i.e. has not moved) */
+ /* send the oid, it's size, it's header and data */
+ header = (objheader_t *)mobj;
+ GETSIZE(size, header);
+ size += sizeof(objheader_t);
+ *(buffer + index) = OBJECT_FOUND;
+ index += sizeof(char);
+ *((unsigned int *)(buffer+index)) = oid;
+ index += sizeof(unsigned int);
+ *((int *)(buffer+index)) = size;
+ index += sizeof(int);
+ memcpy(buffer + index, header, size);
+ index += size;
+ /* Calculate the oid corresponding to the offset value */
+ for(i = 0 ; i< numoffset ; i++) {
+ /* Check for arrays */
+ if(TYPE(header) > NUMCLASSES) {
+ isArray = 1;
+ }
+ if(isArray == 1) {
+ int elementsize = classsize[TYPE(header)];
+ objoid = *((unsigned int *)(((char *)header) + sizeof(objheader_t) + sizeof(struct ArrayObject) + (elementsize*offset[i])));
+ } else {
+ objoid = *((unsigned int *)(((char *)header) + sizeof(objheader_t) + offset[i]));
+ }
+ if((header = mhashSearch(objoid)) == NULL) {
+ /* Obj not found, send oid */
+ *(buffer + index) = OBJECT_NOT_FOUND;
+ index += sizeof(char);
+ *((unsigned int *)(buffer+index)) = objoid;
+ index += sizeof(unsigned int);
+ break;
+ } else {/* Obj Found */
+ /* send the oid, it's size, it's header and data */
+ GETSIZE(size, header);
+ size+=sizeof(objheader_t);
+ *(buffer+index) = OBJECT_FOUND;
+ index += sizeof(char);
+ *((unsigned int *)(buffer+index)) = objoid;
+ index += sizeof(unsigned int);
+ *((int *)(buffer+index)) = size;
+ index += sizeof(int);
+ memcpy(buffer+index, header, size);
+ index += size;
+ isArray = 0;
+ continue;
+ }
+ }
+ }
+
+ /* Check for overflow in the buffer */
+ if (index >= PRE_BUF_SIZE) {
+ printf("Error: Buffer array overflow %s, %d\n", __FILE__, __LINE__);
+ return 1;
+ }
+ /* Send Prefetch response control message only once*/
+ if(count == 1){
+ control = TRANS_PREFETCH_RESPONSE;
+ if((numbytes = send(acceptfd, &control, sizeof(char), MSG_NOSIGNAL)) < sizeof(char)) {
+ perror("Error: in sending PREFETCH RESPONSE to Coordinator\n");
+ return 1;
+ }
+ }
+
+ //Send buffer size
+ if((numbytes = send(acceptfd, &index, sizeof(unsigned int), MSG_NOSIGNAL)) < sizeof(unsigned int)) {
+ perror("Error: in sending PREFETCH RESPONSE to Coordinator\n");
+ return 1;
+ }
+
+ /* Send the entire buffer with its size and oids found and not found */
+ if(send((int)acceptfd, &buffer, index, MSG_NOSIGNAL) < sizeof(index)) {
+ perror("Error: sending oids found\n");
+ return 1;
+ }
+ }
return 0;
}
+void processReqNotify(unsigned int numoid, unsigned int *oidarry, unsigned short *versionarry, unsigned int mid, unsigned int threadid) {
+ objheader_t *header;
+ unsigned int oid;
+ unsigned short newversion;
+ char msg[1+ 2 * sizeof(unsigned int) + sizeof(unsigned short)];
+ int sd;
+ struct sockaddr_in remoteAddr;
+ int bytesSent;
+ int status, size;
+
+ int i = 0;
+ while(i < numoid) {
+ oid = *(oidarry + i);
+ if((header = (objheader_t *) mhashSearch(oid)) == NULL) {
+ printf("Error: mhashsearch returns NULL at %s, %d\n", __FILE__, __LINE__);
+ return;
+ } else {
+ /* Check to see if versions are same */
+checkversion:
+ if ((STATUS(header) & LOCK) != LOCK) {
+ //FIXME make locking atomic
+ STATUS(header) |= LOCK;
+ newversion = header->version;
+ if(newversion == *(versionarry + i)) {
+ //Add to the notify list
+ if((header->notifylist = insNode(header->notifylist, threadid, mid)) == NULL) {
+ printf("Error: Obj notify list points to NULL %s, %d\n", __FILE__, __LINE__);
+ return;
+ }
+ STATUS(header) &= ~(LOCK);
+ } else {
+ STATUS(header) &= ~(LOCK);
+ if ((sd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
+ perror("processReqNotify():socket()");
+ return;
+ }
+ bzero(&remoteAddr, sizeof(remoteAddr));
+ remoteAddr.sin_family = AF_INET;
+ remoteAddr.sin_port = htons(LISTEN_PORT);
+ remoteAddr.sin_addr.s_addr = htonl(mid);
+
+ if (connect(sd, (struct sockaddr *)&remoteAddr, sizeof(remoteAddr)) < 0){
+ printf("Error: processReqNotify():error %d connecting to %s:%d\n", errno,
+ inet_ntoa(remoteAddr.sin_addr), LISTEN_PORT);
+ status = -1;
+ } else {
+ //Send Update notification
+ msg[0] = THREAD_NOTIFY_RESPONSE;
+ *((unsigned int *)&msg[1]) = oid;
+ size = sizeof(unsigned int);
+ *((unsigned short *)(&msg[1]+size)) = newversion;
+ size += sizeof(unsigned short);
+ *((unsigned int *)(&msg[1]+size)) = threadid;
+ bytesSent = send(sd, msg, 1+ 2*sizeof(unsigned int) + sizeof(unsigned short), 0);
+ if (bytesSent < 0){
+ perror("processReqNotify():send()");
+ status = -1;
+ } else if (bytesSent != 1 + sizeof(unsigned short) + 2*sizeof(unsigned int)){
+ printf("Error: processReqNotify(): error, sent %d bytes %s, %d\n",
+ bytesSent, __FILE__, __LINE__);
+ status = -1;
+ } else {
+ status = 0;
+ }
+
+ }
+ close(sd);
+ }
+ } else {
+ randomdelay();
+ goto checkversion;
+ }
+ }
+ i++;
+ }
+ free(oidarry);
+ free(versionarry);
+}
+
projects / IRC.git / blobdiff