#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);
- /* Create machine lookup table and location lookup table */
+ 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
+
+ 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;
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) {
- if (retval == 0) {
- return; // Testing connection
- }
- 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:
/* 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 NULL;
+ 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), MSG_NOSIGNAL) < sizeof(char)) {
perror("Error sending control msg to coordinator\n");
- return NULL;
+ pthread_exit(NULL);
}
} else {
/* Type */
- 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");
- return NULL;
- }
- if(send((int)acceptfd, h, size, MSG_NOSIGNAL) < size) {
- perror("Error in sending object\n");
- return NULL;
- }
+ 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, 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:
/* Read transaction request */
- printf("DEBUG -> Recv TRANS_REQUEST\n");
if((val = readClientReq(&transinfo, (int)acceptfd)) != 0) {
- printf("Error in readClientReq\n");
- return;
+ printf("Error: In readClientReq() %s, %d\n", __FILE__, __LINE__);
+ pthread_exit(NULL);
}
break;
case TRANS_PREFETCH:
- printf("DEBUG -> Recv TRANS_PREFETCH\n");
if((val = prefetchReq((int)acceptfd)) != 0) {
- printf("Error in readClientReq\n");
- return;
+ 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);
pthread_exit(NULL);
}
int readClientReq(trans_commit_data_t *transinfo, int acceptfd) {
char *ptr;
void *modptr;
+ unsigned int *oidmod, oid;
fixed_data_t fixed;
+ objheader_t *headaddr;
int sum = 0, i, N, n, val;
+ oidmod = NULL;
+
/* Read fixed_data_t data structure */
N = sizeof(fixed) - 1;
ptr = (char *)&fixed;;
}
/* Read modified objects */
- if(fixed.nummod != 0) { // If pile contains more than one modified object,
- // allocate new object store and recv all modified objects
- // TODO deallocate this space
- if ((modptr = objstrAlloc(mainobjstore, fixed.sum_bytes)) == NULL) {
- printf("objstrAlloc error for modified objects %s, %d\n", __FILE__, __LINE__);
+ 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 by the Coordinator
- n = recv((int)acceptfd, modptr+sum, fixed.sum_bytes-sum, 0);
+ n = recv((int)acceptfd, (char *) modptr+sum, fixed.sum_bytes-sum, 0);
sum += n;
} while (sum < fixed.sum_bytes && n != 0);
}
+ /* 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, acceptfd)) != 0) {
- printf("Error in processClientReq %s, %d\n", __FILE__, __LINE__);
+ 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);
+ }
+
return 0;
}
* 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, int acceptfd) {
- char *ptr, control, sendctrl;
+ 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, retval;
+ int i = 0, val;
/* Send reply to the Coordinator */
if((retval = handleTransReq(fixed, transinfo, listmid, objread, modptr,acceptfd)) == 0 ) {
- printf("Handle Trans Req error %s, %d\n", __FILE__, __LINE__);
- return 1;
- }
- /* Read new control message from Coordiator */
- if((retval = recv((int)acceptfd, &control, sizeof(char), 0)) <= 0 ) {
- perror("Error in receiving control message\n");
+ 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:
- /* Set 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];
- }
+ 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);
}
-
+
/* Send ack to Coordinator */
- printf("DEBUG -> Recv TRANS_ABORT\n");
- sendctrl = TRANS_SUCESSFUL;
+ sendctrl = TRANS_UNSUCESSFUL;
if(send((int)acceptfd, &sendctrl, sizeof(char), MSG_NOSIGNAL) < sizeof(char)) {
- perror("Error sending ACK to coordinator\n");
+ perror("Error: In sending ACK to coordinator\n");
+ if (transinfo->objlocked != NULL) {
+ free(transinfo->objlocked);
+ }
+ if (transinfo->objnotfound != NULL) {
+ free(transinfo->objnotfound);
+ }
+
return 1;
}
- ptr = NULL;
- // return 0;
break;
case TRANS_COMMIT:
/* Invoke the transCommit process() */
- printf("DEBUG -> Recv TRANS_COMMIT \n");
- if((val = transCommitProcess(transinfo, (int)acceptfd)) != 0) {
- printf("Error in transCommitProcess %s, %d\n", __FILE__, __LINE__);
+ 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\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 */
- printf("DEBUG -> Freeing...\n");
- fflush(stdout);
- if (transinfo->objmod != NULL) {
- free(transinfo->objmod);
- transinfo->objmod = NULL;
- }
if (transinfo->objlocked != NULL) {
free(transinfo->objlocked);
- transinfo->objlocked = NULL;
}
if (transinfo->objnotfound != NULL) {
free(transinfo->objnotfound);
- transinfo->objnotfound = NULL;
}
+
return 0;
}
/* This function increments counters while running a voting decision on all objects involved
- * in TRANS_REQUEST */
-
+ * 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;
- short version;
+ 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, objmod =0, v_nomatch = 0, v_matchlock = 0, v_matchnolock = 0;
- int objmodnotfound = 0, nummodfound = 0;
+ int objnotfound = 0, objlocked = 0;
+ int v_nomatch = 0, v_matchlock = 0, v_matchnolock = 0;
/* 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 = modptr;
+ ptr = (char *) modptr;
/* Process each oid in the machine pile/ group per thread */
for (i = 0; i < fixed->numread + fixed->nummod; i++) {
incr *= i;
oid = *((unsigned int *)(objread + incr));
incr += sizeof(unsigned int);
- version = *((short *)(objread + incr));
+ version = *((unsigned short *)(objread + incr));
} else {//Objs 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];
+ 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 and number of oids not found for later use */
- oidnotfound[objnotfound] = ((objheader_t *)mobj)->oid;
+ oidnotfound[objnotfound] = oid;
objnotfound++;
} else { /* If Obj found in machine (i.e. has not moved) */
/* Check if Obj is locked by any previous transaction */
- if ((((objheader_t *)mobj)->status & LOCK) == LOCK) {
- if (version == ((objheader_t *)mobj)->version) { /* If not locked then match versions */
+ 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 */
v_nomatch++;
/* Send TRANS_DISAGREE to Coordinator */
control = TRANS_DISAGREE;
+ 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 {/* If Obj is not locked then lock object */
- ((objheader_t *)mobj)->status |= LOCK;
-
- /*TESTING Add random wait to make transactions run for a long time such that
- * we can test for soft abort case */
-
- randomdelay();
-
+ STATUS(((objheader_t *)mobj)) |= LOCK;
/* Save all object oids that are locked on this machine during this transaction request call */
- oidlocked[objlocked] = ((objheader_t *)mobj)->oid;
+ oidlocked[objlocked] = OID(((objheader_t *)mobj));
objlocked++;
if (version == ((objheader_t *)mobj)->version) { /* Check if versions match */
v_matchnolock++;
} else { /* If versions don't match ...HARD ABORT */
v_nomatch++;
control = TRANS_DISAGREE;
+ 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 ((val = decideCtrlMessage(fixed, transinfo, &v_matchnolock, &v_matchlock, &v_nomatch, &objnotfound, &objlocked,
- modptr, oidnotfound, oidlocked, oidmod, acceptfd)) == 0) {
- printf("Error in decideCtrlMessage %s, %d\n", __FILE__, __LINE__);
+ 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 val;
+ return control;
}
/* 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 */
-int decideCtrlMessage(fixed_data_t *fixed, trans_commit_data_t *transinfo, int *v_matchnolock, int *v_matchlock,
+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, unsigned int *oidmod,
- int acceptfd) {
+ unsigned int *oidnotfound, unsigned int *oidlocked, int acceptfd) {
int val;
char control = 0;
+
/* Condition to send TRANS_AGREE */
if(*(v_matchnolock) == fixed->numread + fixed->nummod) {
control = TRANS_AGREE;
+ /* 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");
}
/* Condition to send TRANS_SOFT_ABORT */
if((*(v_matchlock) > 0 && *(v_nomatch) == 0) || (*(objnotfound) > 0 && *(v_nomatch) == 0)) {
control = TRANS_SOFT_ABORT;
- char msg[]={TRANS_SOFT_ABORT, 0,0,0,0};
- *((int*)&msg[1])= *(objnotfound);
- printf("DEBUG -> Sending TRANS_SOFT_ABORT\n");
/* Send control message */
- if((val = send(acceptfd, &msg, sizeof(msg),MSG_NOSIGNAL)) < sizeof(msg)) {
- perror("Error in sending no of objects that are not found\n");
+ if((val = send(acceptfd, &control, sizeof(char),MSG_NOSIGNAL)) < sizeof(char)) {
+ perror("Error in sending TRANS_SOFT_ABORT control\n");
return 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");
/* Fill out the trans_commit_data_t data structure. This is required for a trans commit process
* if Participant receives a TRANS_COMMIT */
- transinfo->objmod = oidmod;
transinfo->objlocked = oidlocked;
transinfo->objnotfound = oidnotfound;
transinfo->modptr = modptr;
- transinfo->nummod = fixed->nummod;
transinfo->numlocked = *(objlocked);
transinfo->numnotfound = *(objnotfound);
/* 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(trans_commit_data_t *transinfo, int acceptfd) {
+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;
+ int tmpsize;
+
/* 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("mhashsearch returns NULL at %s, %d\n", __FILE__, __LINE__);
+ 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 the val
-
- /* Change ptr address in mhash table */
- printf("DEBUG -> removing object oid = %d\n", transinfo->objmod[i]);
- mhashRemove(transinfo->objmod[i]);
- mhashInsert(transinfo->objmod[i], (transinfo->modptr + offset));
- offset += sizeof(objheader_t) + classsize[header->type];
-
- /* Update object version number */
- 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;
}
+
+ if (nummod > 0)
+ free(modptr);
+
/* Unlock locked objects */
- for(i=0; i<transinfo->numlocked; i++) {
- header = (objheader_t *) mhashSearch(transinfo->objlocked[i]);
- header->status &= ~(LOCK);
+ 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 */
control = TRANS_SUCESSFUL;
- printf("DEBUG-> TRANS_SUCESSFUL\n");
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