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

   1 /* Coordinator => Machine that initiates the transaction request call for commiting a transaction
   2  * Participant => Machines that host the objects involved in a transaction commit */
   3
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <pthread.h>
   8 #include <netdb.h>
   9 #include <fcntl.h>
  10 #include <errno.h>
  11 #include <string.h>
  12 #include "dstm.h"
  13 #include "mlookup.h"
  14 #include "llookup.h"
  15 #include "threadnotify.h"
  16 #ifdef COMPILER
  17 #include "thread.h"
  18 #endif
  19
  20
  21 #define LISTEN_PORT 2156
  22 #define BACKLOG 10 //max pending connections
  23 #define RECEIVE_BUFFER_SIZE 2048
  24
  25 extern int classsize[];
  26
  27 objstr_t *mainobjstore;
  28 pthread_mutex_t mainobjstore_mutex;
  29 pthread_mutexattr_t mainobjstore_mutex_attr; /* Attribute for lock to make it a recursive lock */
  30 pthread_mutex_t threadnotify_mutex = PTHREAD_MUTEX_INITIALIZER;
  31
  32 /* This function initializes the main objects store and creates the
  33  * global machine and location lookup table */
  34
  35 int dstmInit(void)
  36 {
  37         mainobjstore = objstrCreate(DEFAULT_OBJ_STORE_SIZE);
  38         /* Initialize attribute for mutex */
  39         pthread_mutexattr_init(&mainobjstore_mutex_attr);
  40         pthread_mutexattr_settype(&mainobjstore_mutex_attr, PTHREAD_MUTEX_RECURSIVE_NP);
  41         pthread_mutex_init(&mainobjstore_mutex, &mainobjstore_mutex_attr);
  42         if (mhashCreate(HASH_SIZE, LOADFACTOR))
  43                 return 1; //failure
  44
  45         if (lhashCreate(HASH_SIZE, LOADFACTOR))
  46                 return 1; //failure
  47
  48         if (notifyhashCreate(N_HASH_SIZE, N_LOADFACTOR))
  49                 return 1; //failure
  50
  51         return 0;
  52 }
  53
  54 /* This function starts the thread to listen on a socket
  55  * for tranaction calls */
  56 void *dstmListen()
  57 {
  58         int listenfd, acceptfd;
  59         struct sockaddr_in my_addr;
  60         struct sockaddr_in client_addr;
  61         socklen_t addrlength = sizeof(struct sockaddr);
  62         pthread_t thread_dstm_accept;
  63         int i;
  64         int setsockflag=1;
  65
  66         listenfd = socket(AF_INET, SOCK_STREAM, 0);
  67         if (listenfd == -1)
  68         {
  69                 perror("socket");
  70                 exit(1);
  71         }
  72
  73         if (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &setsockflag, sizeof (setsockflag)) < 0) {
  74           perror("socket");
  75           exit(1);
  76         }
  77 #ifdef MAC
  78         if (setsockopt(listenfd, SOL_SOCKET, SO_NOSIGPIPE, &setsockflag, sizeof (setsockflag)) < 0) {
  79           perror("socket");
  80           exit(1);
  81         }
  82 #endif
  83
  84         my_addr.sin_family = AF_INET;
  85         my_addr.sin_port = htons(LISTEN_PORT);
  86         my_addr.sin_addr.s_addr = INADDR_ANY;
  87         memset(&(my_addr.sin_zero), '\0', 8);
  88
  89         if (bind(listenfd, (struct sockaddr *)&my_addr, addrlength) == -1)
  90         {
  91                 perror("bind");
  92                 exit(1);
  93         }
  94
  95         if (listen(listenfd, BACKLOG) == -1)
  96         {
  97                 perror("listen");
  98                 exit(1);
  99         }
 100
 101         printf("Listening on port %d, fd = %d\n", LISTEN_PORT, listenfd);
 102         while(1)
 103         {
 104           int retval;
 105           acceptfd = accept(listenfd, (struct sockaddr *)&client_addr, &addrlength);
 106           do {
 107             retval=pthread_create(&thread_dstm_accept, NULL, dstmAccept, (void *)acceptfd);
 108           } while(retval!=0);
 109           pthread_detach(thread_dstm_accept);
 110         }
 111 }
 112 /* This function accepts a new connection request, decodes the control message in the connection
 113  * and accordingly calls other functions to process new requests */
 114 void *dstmAccept(void *acceptfd)
 115 {
 116         int val, retval, size, sum;
 117         unsigned int oid;
 118         char *buffer;
 119         char control,ctrl;
 120         char *ptr;
 121         void *srcObj;
 122         objheader_t *h;
 123         trans_commit_data_t transinfo;
 124         unsigned short objType, *versionarry, version;
 125         unsigned int *oidarry, numoid, mid, threadid;
 126
 127         transinfo.objlocked = NULL;
 128         transinfo.objnotfound = NULL;
 129         transinfo.modptr = NULL;
 130         transinfo.numlocked = 0;
 131         transinfo.numnotfound = 0;
 132
 133         /* Receive control messages from other machines */
 134         if((retval = recv((int)acceptfd, &control, sizeof(char), 0)) <= 0) {
 135                 printf("%s() Error: Receiving control = %d at %s, %d\n", __func__, control, __FILE__, __LINE__);
 136                 pthread_exit(NULL);
 137         }
 138
 139         switch(control) {
 140                 case READ_REQUEST:
 141                         /* Read oid requested and search if available */
 142                         if((retval = recv((int)acceptfd, &oid, sizeof(unsigned int), 0)) <= 0) {
 143                                 perror("Error: receiving 0x0 object from cooridnator\n");
 144                                 pthread_exit(NULL);
 145                         }
 146                         if((srcObj = mhashSearch(oid)) == NULL) {
 147                                 printf("Error: Object 0x%x is not found in Main Object Store %s, %d\n", oid, __FILE__, __LINE__);
 148                                 pthread_exit(NULL);
 149                         }
 150                         h = (objheader_t *) srcObj;
 151                         GETSIZE(size, h);
 152                         size += sizeof(objheader_t);
 153
 154                         if (h == NULL) {
 155                                 ctrl = OBJECT_NOT_FOUND;
 156                                 if(send((int)acceptfd, &ctrl, sizeof(char), MSG_NOSIGNAL) < sizeof(char)) {
 157                                         perror("Error sending control msg to coordinator\n");
 158                                         pthread_exit(NULL);
 159                                 }
 160                         } else {
 161                                 /* Type */
 162                                 char msg[]={OBJECT_FOUND, 0, 0, 0, 0};
 163                                 *((int *)&msg[1])=size;
 164                                 if(send((int)acceptfd, &msg, sizeof(msg), MSG_NOSIGNAL) < sizeof(msg)) {
 165                                         perror("Error sending size of object to coordinator\n");
 166                                         pthread_exit(NULL);
 167                                 }
 168                                 if(send((int)acceptfd, h, size, MSG_NOSIGNAL) < size) {
 169                                         perror("Error in sending object\n");
 170                                         pthread_exit(NULL);
 171                                 }
 172                         }
 173                         break;
 174
 175                 case READ_MULT_REQUEST:
 176                         break;
 177
 178                 case MOVE_REQUEST:
 179                         break;
 180
 181                 case MOVE_MULT_REQUEST:
 182                         break;
 183
 184                 case TRANS_REQUEST:
 185                         /* Read transaction request */
 186                         if((val = readClientReq(&transinfo, (int)acceptfd)) != 0) {
 187                                 printf("Error: In readClientReq() %s, %d\n", __FILE__, __LINE__);
 188                                 pthread_exit(NULL);
 189                         }
 190                         break;
 191                 case TRANS_PREFETCH:
 192                         if((val = prefetchReq((int)acceptfd)) != 0) {
 193                                 printf("Error: In prefetchReq() %s, %d\n", __FILE__, __LINE__);
 194                                 pthread_exit(NULL);
 195                         }
 196                         break;
 197                 case TRANS_PREFETCH_RESPONSE:
 198                         if((val = getPrefetchResponse((int) acceptfd)) != 0) {
 199                                 printf("Error: In getPrefetchResponse() %s, %d\n", __FILE__, __LINE__);
 200                                 pthread_exit(NULL);
 201                         }
 202                         break;
 203                 case START_REMOTE_THREAD:
 204                         retval = recv((int)acceptfd, &oid, sizeof(unsigned int), 0);
 205                         if (retval <= 0)
 206                                 perror("dstmAccept(): error receiving START_REMOTE_THREAD msg");
 207                         else if (retval != sizeof(unsigned int))
 208                                 printf("dstmAccept(): incorrect msg size %d for START_REMOTE_THREAD %s, %d\n",
 209                                         retval, __FILE__, __LINE__);
 210                         else
 211                         {
 212                                 objType = getObjType(oid);
 213                                 startDSMthread(oid, objType);
 214                         }
 215                         break;
 216
 217                 case THREAD_NOTIFY_REQUEST:
 218                         retval = recv((int)acceptfd, &numoid, sizeof(unsigned int), 0);
 219                         size = (sizeof(unsigned int) + sizeof(unsigned short)) * numoid + 2 * sizeof(unsigned int);
 220                         if((buffer = calloc(1,size)) == NULL) {
 221                                 printf("%s() Calloc error at %s, %d\n", __func__, __FILE__, __LINE__);
 222                                 pthread_exit(NULL);
 223                         }
 224                         sum = 0;
 225                         do {
 226                                 sum += recv((int)acceptfd, buffer+sum, size-sum, 0);
 227                         } while(sum < size);
 228
 229                         oidarry = calloc(numoid, sizeof(unsigned int));
 230                         memcpy(oidarry, buffer, sizeof(unsigned int) * numoid);
 231                         size = sizeof(unsigned int) * numoid;
 232                         versionarry = calloc(numoid, sizeof(unsigned short));
 233                         memcpy(versionarry, buffer+size, sizeof(unsigned short) * numoid);
 234                         size += sizeof(unsigned short) * numoid;
 235                         mid = *((unsigned int *)(buffer+size));
 236                         size += sizeof(unsigned int);
 237                         threadid = *((unsigned int *)(buffer+size));
 238                         processReqNotify(numoid, oidarry, versionarry, mid, threadid);
 239                         free(buffer);
 240
 241                         break;
 242
 243                 case THREAD_NOTIFY_RESPONSE:
 244                         size = sizeof(unsigned short) + 2 * sizeof(unsigned int);
 245                         if((buffer = calloc(1,size)) == NULL) {
 246                                 printf("%s() Calloc error at %s, %d\n", __func__, __FILE__, __LINE__);
 247                                 pthread_exit(NULL);
 248                         }
 249
 250                         sum = 0;
 251                         do {
 252                                 sum += recv((int)acceptfd, buffer+sum, size-sum, 0);
 253                         } while(sum < size);
 254
 255                         oid = *((unsigned int *)buffer);
 256                         size = sizeof(unsigned int);
 257                         version = *((unsigned short *)(buffer+size));
 258                         size += sizeof(unsigned short);
 259                         threadid = *((unsigned int *)(buffer+size));
 260                         threadNotify(oid,version,threadid);
 261                         free(buffer);
 262
 263                         break;
 264                 default:
 265                         printf("Error: dstmAccept() Unknown opcode %d at %s, %d\n", control, __FILE__, __LINE__);
 266         }
 267
 268         /* Close connection */
 269         if (close((int)acceptfd) == -1)
 270                 perror("close");
 271
 272         pthread_exit(NULL);
 273 }
 274
 275 /* This function reads the information available in a transaction request
 276  * and makes a function call to process the request */
 277 int readClientReq(trans_commit_data_t *transinfo, int acceptfd) {
 278         char *ptr;
 279         void *modptr;
 280         unsigned int *oidmod, oid;
 281         fixed_data_t fixed;
 282         objheader_t *headaddr;
 283         int sum = 0, i, N, n, val;
 284
 285         oidmod = NULL;
 286
 287         /* Read fixed_data_t data structure */
 288         N = sizeof(fixed) - 1;
 289         ptr = (char *)&fixed;;
 290         fixed.control = TRANS_REQUEST;
 291         do {
 292                 n = recv((int)acceptfd, (void *) ptr+1+sum, N-sum, 0);
 293                 sum += n;
 294         } while(sum < N && n != 0);
 295
 296         /* Read list of mids */
 297         int mcount = fixed.mcount;
 298         N = mcount * sizeof(unsigned int);
 299         unsigned int listmid[mcount];
 300         ptr = (char *) listmid;
 301         sum = 0;
 302         do {
 303                 n = recv((int)acceptfd, (void *) ptr+sum, N-sum, 0);
 304                 sum += n;
 305         } while(sum < N && n != 0);
 306
 307         /* Read oid and version tuples for those objects that are not modified in the transaction */
 308         int numread = fixed.numread;
 309         N = numread * (sizeof(unsigned int) + sizeof(short));
 310         char objread[N];
 311         if(numread != 0) { //If pile contains more than one object to be read,
 312                           // keep reading all objects
 313                 sum = 0;
 314                 do {
 315                         n = recv((int)acceptfd, (void *) objread+sum, N-sum, 0);
 316                         sum += n;
 317                 } while(sum < N && n != 0);
 318         }
 319
 320         /* Read modified objects */
 321         if(fixed.nummod != 0) {
 322                 if ((modptr = calloc(1, fixed.sum_bytes)) == NULL) {
 323                         printf("calloc error for modified objects %s, %d\n", __FILE__, __LINE__);
 324                         return 1;
 325                 }
 326                 sum = 0;
 327                 do { // Recv the objs that are modified by the Coordinator
 328                         n = recv((int)acceptfd, (char *) modptr+sum, fixed.sum_bytes-sum, 0);
 329                         sum += n;
 330                 } while (sum < fixed.sum_bytes && n != 0);
 331         }
 332
 333         /* Create an array of oids for modified objects */
 334         oidmod = (unsigned int *) calloc(fixed.nummod, sizeof(unsigned int));
 335         if (oidmod == NULL)
 336         {
 337                 printf("calloc error %s, %d\n", __FILE__, __LINE__);
 338                 return 1;
 339         }
 340         ptr = (char *) modptr;
 341         for(i = 0 ; i < fixed.nummod; i++) {
 342           int tmpsize;
 343           headaddr = (objheader_t *) ptr;
 344           oid = OID(headaddr);
 345           oidmod[i] = oid;
 346           GETSIZE(tmpsize, headaddr);
 347           ptr += sizeof(objheader_t) + tmpsize;
 348         }
 349
 350         /*Process the information read */
 351         if((val = processClientReq(&fixed, transinfo, listmid, objread, modptr, oidmod, acceptfd)) != 0) {
 352                 printf("Error: In processClientReq() %s, %d\n", __FILE__, __LINE__);
 353                 /* Free resources */
 354                 if(oidmod != NULL) {
 355                         free(oidmod);
 356                 }
 357                 return 1;
 358         }
 359
 360         /* Free resources */
 361         if(oidmod != NULL) {
 362                 free(oidmod);
 363         }
 364
 365         return 0;
 366 }
 367
 368 /* This function processes the Coordinator's transaction request using "handleTransReq"
 369  * function and sends a reply to the co-ordinator.
 370  * Following this it also receives a new control message from the co-ordinator and processes this message*/
 371 int processClientReq(fixed_data_t *fixed, trans_commit_data_t *transinfo,
 372                 unsigned int *listmid, char *objread, void *modptr, unsigned int *oidmod, int acceptfd) {
 373         char control, sendctrl, retval;
 374         objheader_t *tmp_header;
 375         void *header;
 376         int  i = 0, val;
 377
 378         /* Send reply to the Coordinator */
 379         if((retval = handleTransReq(fixed, transinfo, listmid, objread, modptr,acceptfd)) == 0 ) {
 380                 printf("Error: In handleTransReq() %s, %d\n", __FILE__, __LINE__);
 381                 return 1;
 382         }
 383
 384         do {
 385                 retval = recv((int)acceptfd, &control, sizeof(char), 0);
 386         } while(retval < sizeof(char));
 387
 388         /* Process the new control message */
 389         switch(control) {
 390                 case TRANS_ABORT:
 391                         if (fixed->nummod > 0)
 392                                 free(modptr);
 393                         /* Unlock objects that was locked due to this transaction */
 394                         for(i = 0; i< transinfo->numlocked; i++) {
 395                                 if((header = mhashSearch(transinfo->objlocked[i])) == NULL) {
 396                                         printf("mhashSearch returns NULL at %s, %d\n", __FILE__, __LINE__);// find the header address
 397                                         return 1;
 398                                 }
 399                                 STATUS(((objheader_t *)header)) &= ~(LOCK);
 400                         }
 401
 402                         /* Send ack to Coordinator */
 403                         sendctrl = TRANS_UNSUCESSFUL;
 404                         if(send((int)acceptfd, &sendctrl, sizeof(char), MSG_NOSIGNAL) < sizeof(char)) {
 405                                 perror("Error: In sending ACK to coordinator\n");
 406                                 if (transinfo->objlocked != NULL) {
 407                                         free(transinfo->objlocked);
 408                                 }
 409                                 if (transinfo->objnotfound != NULL) {
 410                                         free(transinfo->objnotfound);
 411                                 }
 412
 413                                 return 1;
 414                         }
 415                         break;
 416
 417                 case TRANS_COMMIT:
 418                         /* Invoke the transCommit process() */
 419                         if((val = transCommitProcess(modptr, oidmod, transinfo->objlocked, fixed->nummod, transinfo->numlocked, (int)acceptfd)) != 0) {
 420                                 printf("Error: In transCommitProcess() %s, %d\n", __FILE__, __LINE__);
 421                                 /* Free memory */
 422                                 if (transinfo->objlocked != NULL) {
 423                                         free(transinfo->objlocked);
 424                                 }
 425                                 if (transinfo->objnotfound != NULL) {
 426                                         free(transinfo->objnotfound);
 427                                 }
 428                                 return 1;
 429                         }
 430                         break;
 431
 432                 case TRANS_ABORT_BUT_RETRY_COMMIT_WITH_RELOCATING:
 433                         break;
 434                 default:
 435                         printf("Error: No response to TRANS_AGREE OR DISAGREE protocol %s, %d\n", __FILE__, __LINE__);
 436                         //TODO Use fixed.trans_id  TID since Client may have died
 437                         break;
 438         }
 439
 440         /* Free memory */
 441         if (transinfo->objlocked != NULL) {
 442                 free(transinfo->objlocked);
 443         }
 444         if (transinfo->objnotfound != NULL) {
 445                 free(transinfo->objnotfound);
 446         }
 447
 448         return 0;
 449 }
 450
 451 /* This function increments counters while running a voting decision on all objects involved
 452  * in TRANS_REQUEST and If a TRANS_DISAGREE sends the response immediately back to the coordinator */
 453 char handleTransReq(fixed_data_t *fixed, trans_commit_data_t *transinfo, unsigned int *listmid, char *objread, void *modptr, int acceptfd) {
 454         int val, i = 0, j;
 455         unsigned short version;
 456         char control = 0, *ptr;
 457         unsigned int oid;
 458         unsigned int *oidnotfound, *oidlocked;
 459         void *mobj;
 460         objheader_t *headptr;
 461
 462         /* Counters and arrays to formulate decision on control message to be sent */
 463         oidnotfound = (unsigned int *) calloc(fixed->numread + fixed->nummod, sizeof(unsigned int));
 464         oidlocked = (unsigned int *) calloc(fixed->numread + fixed->nummod, sizeof(unsigned int));
 465         int objnotfound = 0, objlocked = 0;
 466         int v_nomatch = 0, v_matchlock = 0, v_matchnolock = 0;
 467
 468         /* modptr points to the beginning of the object store
 469          * created at the Pariticipant.
 470          * Object store holds the modified objects involved in the transaction request */
 471         ptr = (char *) modptr;
 472
 473         /* Process each oid in the machine pile/ group per thread */
 474         for (i = 0; i < fixed->numread + fixed->nummod; i++) {
 475                 if (i < fixed->numread) {//Objs only read and not modified
 476                         int incr = sizeof(unsigned int) + sizeof(short);// Offset that points to next position in the objread array
 477                         incr *= i;
 478                         oid = *((unsigned int *)(objread + incr));
 479                         incr += sizeof(unsigned int);
 480                         version = *((unsigned short *)(objread + incr));
 481                 } else {//Objs modified
 482                   int tmpsize;
 483                   headptr = (objheader_t *) ptr;
 484                   oid = OID(headptr);
 485                   version = headptr->version;
 486                   GETSIZE(tmpsize, headptr);
 487                   ptr += sizeof(objheader_t) + tmpsize;
 488                 }
 489
 490                 /* Check if object is still present in the machine since the beginning of TRANS_REQUEST */
 491
 492                 if ((mobj = mhashSearch(oid)) == NULL) {/* Obj not found */
 493                         /* Save the oids not found and number of oids not found for later use */
 494                         oidnotfound[objnotfound] = oid;
 495                         objnotfound++;
 496                 } else { /* If Obj found in machine (i.e. has not moved) */
 497                         /* Check if Obj is locked by any previous transaction */
 498                         if ((STATUS(((objheader_t *)mobj)) & LOCK) == LOCK) {
 499                                 if (version == ((objheader_t *)mobj)->version) {      /* If locked then match versions */
 500                                         v_matchlock++;
 501                                 } else {/* If versions don't match ...HARD ABORT */
 502                                         v_nomatch++;
 503                                         /* Send TRANS_DISAGREE to Coordinator */
 504                                         control = TRANS_DISAGREE;
 505                                         if (objlocked > 0) {
 506                                           for(j = 0; j < objlocked; j++) {
 507                                                         if((headptr = mhashSearch(oidlocked[j])) == NULL) {
 508                                                                 printf("mhashSearch returns NULL at %s, %d\n", __FILE__, __LINE__);
 509                                                                 return 0;
 510                                                         }
 511                                                         STATUS(headptr) &= ~(LOCK);
 512                                                 }
 513                                                 free(oidlocked);
 514                                         }
 515                                         if((val = send(acceptfd, &control, sizeof(char), MSG_NOSIGNAL)) < sizeof(char)) {
 516                                                 perror("Error in sending control to the Coordinator\n");
 517                                                 return 0;
 518                                         }
 519                                         return control;
 520                                 }
 521                         } else {/* If Obj is not locked then lock object */
 522                                 STATUS(((objheader_t *)mobj)) |= LOCK;
 523                                 /* Save all object oids that are locked on this machine during this transaction request call */
 524                                 oidlocked[objlocked] = OID(((objheader_t *)mobj));
 525                                 objlocked++;
 526                                 if (version == ((objheader_t *)mobj)->version) { /* Check if versions match */
 527                                         v_matchnolock++;
 528                                 } else { /* If versions don't match ...HARD ABORT */
 529                                         v_nomatch++;
 530                                         control = TRANS_DISAGREE;
 531                                         if (objlocked > 0) {
 532                                                 for(j = 0; j < objlocked; j++) {
 533                                                         if((headptr = mhashSearch(oidlocked[j])) == NULL) {
 534                                                                 printf("mhashSearch returns NULL at %s, %d\n", __FILE__, __LINE__);
 535                                                                 return 0;
 536                                                         }
 537                                                         STATUS(headptr) &= ~(LOCK);
 538                                                 }
 539                                                 free(oidlocked);
 540                                         }
 541
 542                                         /* Send TRANS_DISAGREE to Coordinator */
 543                                         if((val = send(acceptfd, &control, sizeof(char), MSG_NOSIGNAL)) < sizeof(char)) {
 544                                                 perror("Error in sending control to the Coordinator\n");
 545                                                 return 0;
 546                                         }
 547
 548                                         return control;
 549                                 }
 550                         }
 551                 }
 552         }
 553
 554         /* Decide what control message to send to Coordinator */
 555         if ((control = decideCtrlMessage(fixed, transinfo, &v_matchnolock, &v_matchlock, &v_nomatch, &objnotfound, &objlocked,
 556                                         modptr, oidnotfound, oidlocked, acceptfd)) == 0) {
 557                 printf("Error: In decideCtrlMessage() %s, %d\n", __FILE__, __LINE__);
 558                 return 0;
 559         }
 560
 561         return control;
 562
 563 }
 564 /* This function decides what control message such as TRANS_AGREE, TRANS_DISAGREE or TRANS_SOFT_ABORT
 565  * to send to Coordinator based on the votes of oids involved in the transaction */
 566 char decideCtrlMessage(fixed_data_t *fixed, trans_commit_data_t *transinfo, int *v_matchnolock, int *v_matchlock,
 567                 int *v_nomatch, int *objnotfound, int *objlocked, void *modptr,
 568                 unsigned int *oidnotfound, unsigned int *oidlocked, int acceptfd) {
 569         int val;
 570         char control = 0;
 571
 572         /* Condition to send TRANS_AGREE */
 573         if(*(v_matchnolock) == fixed->numread + fixed->nummod) {
 574                 control = TRANS_AGREE;
 575                 /* Send control message */
 576                 if((val = send(acceptfd, &control, sizeof(char), MSG_NOSIGNAL)) < sizeof(char)) {
 577                         perror("Error in sending control to Coordinator\n");
 578                         return 0;
 579                 }
 580         }
 581         /* Condition to send TRANS_SOFT_ABORT */
 582         if((*(v_matchlock) > 0 && *(v_nomatch) == 0) || (*(objnotfound) > 0 && *(v_nomatch) == 0)) {
 583                 control = TRANS_SOFT_ABORT;
 584
 585                 /* Send control message */
 586                 if((val = send(acceptfd, &control, sizeof(char),MSG_NOSIGNAL)) < sizeof(char)) {
 587                         perror("Error in sending TRANS_SOFT_ABORT control\n");
 588                         return 0;
 589                 }
 590
 591                 /* Send number of oids not found and the missing oids if objects are missing in the machine */
 592                 if(*(objnotfound) != 0) {
 593                         int msg[1];
 594                         msg[0] = *(objnotfound);
 595                         if((val = send(acceptfd, msg, sizeof(int) ,MSG_NOSIGNAL)) < sizeof(int)) {
 596                                 perror("Error in sending objects that are not found\n");
 597                                 return 0;
 598                         }
 599                         int size = sizeof(unsigned int)* *(objnotfound);
 600                         if((val = send(acceptfd, oidnotfound, size ,MSG_NOSIGNAL)) < size) {
 601                                 perror("Error in sending objects that are not found\n");
 602                                 return 0;
 603                         }
 604                 }
 605         }
 606
 607         /* Fill out the trans_commit_data_t data structure. This is required for a trans commit process
 608          * if Participant receives a TRANS_COMMIT */
 609         transinfo->objlocked = oidlocked;
 610         transinfo->objnotfound = oidnotfound;
 611         transinfo->modptr = modptr;
 612         transinfo->numlocked = *(objlocked);
 613         transinfo->numnotfound = *(objnotfound);
 614
 615         return control;
 616 }
 617
 618 /* This function processes all modified objects involved in a TRANS_COMMIT and updates pointer
 619  * addresses in lookup table and also changes version number
 620  * Sends an ACK back to Coordinator */
 621 int transCommitProcess(void *modptr, unsigned int *oidmod, unsigned int *oidlocked, int nummod, int numlocked, int acceptfd) {
 622         objheader_t *header;
 623         objheader_t *newheader;
 624         int i = 0, offset = 0;
 625         char control;
 626         int tmpsize;
 627
 628         /* Process each modified object saved in the mainobject store */
 629         for(i = 0; i < nummod; i++) {
 630                 if((header = (objheader_t *) mhashSearch(oidmod[i])) == NULL) {
 631                         printf("Error: mhashsearch returns NULL at %s, %d\n", __FILE__, __LINE__);
 632                         return 1;
 633                 }
 634                 GETSIZE(tmpsize,header);
 635                 pthread_mutex_lock(&mainobjstore_mutex);
 636                 memcpy((char*)header + sizeof(objheader_t), ((char *)modptr + sizeof(objheader_t) + offset), tmpsize);
 637                 header->version += 1;
 638                 /* If threads are waiting on this object to be updated, notify them */
 639                 if(header->notifylist != NULL) {
 640                         notifyAll(&header->notifylist, OID(header), header->version);
 641                 }
 642                 pthread_mutex_unlock(&mainobjstore_mutex);
 643                 offset += sizeof(objheader_t) + tmpsize;
 644         }
 645
 646         if (nummod > 0)
 647                 free(modptr);
 648
 649         /* Unlock locked objects */
 650         for(i = 0; i < numlocked; i++) {
 651                 if((header = (objheader_t *) mhashSearch(oidlocked[i])) == NULL) {
 652                         printf("Error: mhashsearch returns NULL at %s, %d\n", __FILE__, __LINE__);
 653                         return 1;
 654                 }
 655                 STATUS(header) &= ~(LOCK);
 656         }
 657         //TODO Update location lookup table
 658
 659         /* Send ack to coordinator */
 660         control = TRANS_SUCESSFUL;
 661         if(send((int)acceptfd, &control, sizeof(char), MSG_NOSIGNAL) < sizeof(char)) {
 662                 perror("Error sending ACK to coordinator\n");
 663                 return 1;
 664         }
 665
 666         return 0;
 667 }
 668
 669 /* This function recevies the oid and offset tuples from the Coordinator's prefetch call.
 670  * Looks for the objects to be prefetched in the main object store.
 671  * If objects are not found then record those and if objects are found
 672  * then use offset values to prefetch references to other objects */
 673
 674 int prefetchReq(int acceptfd) {
 675         int i, size, objsize, numbytes = 0, isArray = 0, numoffset = 0;
 676         int length, sd;
 677         char *recvbuffer, *sendbuffer, control;
 678         unsigned int oid, mid;
 679         unsigned short *offsetarry;
 680         objheader_t *header;
 681         struct sockaddr_in remoteAddr;
 682
 683         while((numbytes = recv((int)acceptfd, &length, sizeof(int), 0)) != 0) {
 684                 if(length == -1) { //-1 is special character to represent end of sending oids and offsets
 685                         break;
 686                 } else {
 687                         numbytes = 0;
 688                         size = length - sizeof(int);
 689                         if((recvbuffer = calloc(1, size)) == NULL) {
 690                                 printf("Calloc error at %s,%d\n", __FILE__, __LINE__);
 691                                 return -1;
 692                         }
 693                         while(numbytes < size) {
 694                                 numbytes += recv((int)acceptfd, recvbuffer+numbytes, size-numbytes, 0);
 695                         }
 696
 697                         oid = *((unsigned int *) recvbuffer);
 698                         mid = *((unsigned int *) (recvbuffer + sizeof(unsigned int)));
 699                         size = size - (2 * sizeof(unsigned int));
 700                         numoffset = size / sizeof(short);
 701                         if((offsetarry = calloc(numoffset, sizeof(unsigned short))) == NULL) {
 702                                 printf("Calloc error at %s,%d\n", __FILE__, __LINE__);
 703                                 free(recvbuffer);
 704                                 return -1;
 705                         }
 706                         memcpy(offsetarry, recvbuffer + (2 * sizeof(unsigned int)), size);
 707                         free(recvbuffer);
 708
 709                         /* Create socket to send information */
 710                         if ((sd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
 711                                 perror("prefetchReq():socket()");
 712                                 return;
 713                         }
 714                         bzero(&remoteAddr, sizeof(remoteAddr));
 715                         remoteAddr.sin_family = AF_INET;
 716                         remoteAddr.sin_port = htons(LISTEN_PORT);
 717                         remoteAddr.sin_addr.s_addr = htonl(mid);
 718
 719                         if (connect(sd, (struct sockaddr *)&remoteAddr, sizeof(remoteAddr)) < 0){
 720                                 printf("Error: prefetchReq():error %d connecting to %s:%d\n", errno,
 721                                                 inet_ntoa(remoteAddr.sin_addr), LISTEN_PORT);
 722                                 close(sd);
 723                                 return -1;
 724                         }
 725
 726                         /*Process each oid */
 727                         if ((header = mhashSearch(oid)) == NULL) {/* Obj not found */
 728                                 /* Save the oids not found in buffer for later use */
 729                                 size = sizeof(int) + sizeof(char) + sizeof(unsigned int) ;
 730                                 if((sendbuffer = calloc(1, size)) == NULL) {
 731                                         printf("Calloc error at %s,%d\n", __FILE__, __LINE__);
 732                                         free(offsetarry);
 733                                         close(sd);
 734                                         return -1;
 735                                 }
 736                                 *((int *) sendbuffer) = size;
 737                                 *((char *)(sendbuffer + sizeof(int))) = OBJECT_NOT_FOUND;
 738                                 *((unsigned int *)(sendbuffer + sizeof(int) + sizeof(char))) = oid;
 739
 740                                 control = TRANS_PREFETCH_RESPONSE;
 741                                 if(sendPrefetchResponse(sd, &control, sendbuffer, &size) != 0) {
 742                                         free(offsetarry);
 743                                         printf("Error: %s() in sending prefetch response at %s, %d\n",
 744                                                         __func__, __FILE__, __LINE__);
 745                                         close(sd);
 746                                         return -1;
 747                                 }
 748                         } else { /* Object Found */
 749                                 int incr = 0;
 750                                 GETSIZE(objsize, header);
 751                                 size = sizeof(int) + sizeof(char) + sizeof(unsigned int) + sizeof(objheader_t) + objsize;
 752                                 if((sendbuffer = calloc(1, size)) == NULL) {
 753                                         printf("Calloc error at %s,%d\n", __FILE__, __LINE__);
 754                                         free(offsetarry);
 755                                         close(sd);
 756                                         return -1;
 757                                 }
 758                                 *((int *) (sendbuffer + incr)) = size;
 759                                 incr += sizeof(int);
 760                                 *((char *)(sendbuffer + incr)) = OBJECT_FOUND;
 761                                 incr += sizeof(char);
 762                                 *((unsigned int *)(sendbuffer+incr)) = oid;
 763                                 incr += sizeof(unsigned int);
 764                                 memcpy(sendbuffer + incr, header, objsize + sizeof(objheader_t));
 765
 766                                 control = TRANS_PREFETCH_RESPONSE;
 767                                 if(sendPrefetchResponse(sd, &control, sendbuffer, &size) != 0) {
 768                                         free(offsetarry);
 769                                         printf("Error: %s() in sending prefetch response at %s, %d\n",
 770                                                         __func__, __FILE__, __LINE__);
 771                                         close(sd);
 772                                         return -1;
 773                                 }
 774                                 /* Calculate the oid corresponding to the offset value */
 775                                 for(i = 0 ; i< numoffset ; i++) {
 776                                         /* Check for arrays  */
 777                                         if(TYPE(header) > NUMCLASSES) {
 778                                                 isArray = 1;
 779                                         }
 780                                         if(isArray == 1) {
 781                                                 int elementsize = classsize[TYPE(header)];
 782                                                 oid = *((unsigned int *)(((char *)header) + sizeof(objheader_t) + sizeof(struct ArrayObject) + (elementsize*offsetarry[i])));
 783                                         } else {
 784                                                 oid = *((unsigned int *)(((char *)header) + sizeof(objheader_t) + offsetarry[i]));
 785                                         }
 786
 787                                         if((header = mhashSearch(oid)) == NULL) {
 788                                                 size = sizeof(int) + sizeof(char) + sizeof(unsigned int) ;
 789                                                 if((sendbuffer = calloc(1, size)) == NULL) {
 790                                                         printf("Calloc error at %s,%d\n", __FILE__, __LINE__);
 791                                                         free(offsetarry);
 792                                                         close(sd);
 793                                                         return -1;
 794                                                 }
 795                                                 *((int *) sendbuffer) = size;
 796                                                 *((char *)(sendbuffer + sizeof(int))) = OBJECT_NOT_FOUND;
 797                                                 *((unsigned int *)(sendbuffer + sizeof(int) + sizeof(char))) = oid;
 798
 799                                                 control = TRANS_PREFETCH_RESPONSE;
 800                                                 if(sendPrefetchResponse(sd, &control, sendbuffer, &size) != 0) {
 801                                                         free(offsetarry);
 802                                                         printf("Error: %s() in sending prefetch response at %s, %d\n",
 803                                                                         __FILE__, __LINE__);
 804                                                         close(sd);
 805                                                         return -1;
 806                                                 }
 807                                                 break;
 808                                         } else {/* Obj Found */
 809                                                 int incr = 0;
 810                                                 GETSIZE(objsize, header);
 811                                                 size = sizeof(int) + sizeof(char) + sizeof(unsigned int) + sizeof(objheader_t) + objsize;
 812                                                 if((sendbuffer = calloc(1, size)) == NULL) {
 813                                                         printf("Calloc error at %s,%d\n", __func__, __FILE__, __LINE__);
 814                                                         free(offsetarry);
 815                                                         close(sd);
 816                                                         return -1;
 817                                                 }
 818                                                 *((int *) (sendbuffer + incr)) = size;
 819                                                 incr += sizeof(int);
 820                                                 *((char *)(sendbuffer + incr)) = OBJECT_FOUND;
 821                                                 incr += sizeof(char);
 822                                                 *((unsigned int *)(sendbuffer+incr)) = oid;
 823                                                 incr += sizeof(unsigned int);
 824                                                 memcpy(sendbuffer + incr, header, objsize + sizeof(objheader_t));
 825
 826                                                 control = TRANS_PREFETCH_RESPONSE;
 827                                                 if(sendPrefetchResponse(sd, &control, sendbuffer, &size) != 0) {
 828                                                         free(offsetarry);
 829                                                         printf("Error: %s() in sending prefetch response at %s, %d\n",
 830                                                                         __func__, __FILE__, __LINE__);
 831                                                         close(sd);
 832                                                         return -1;
 833                                                 }
 834                                         }
 835                                         isArray = 0;
 836                                 }
 837                                 free(offsetarry);
 838                         }
 839                 }
 840         }
 841         close(sd);
 842         return 0;
 843 }
 844
 845 int sendPrefetchResponse(int sd, char *control, char *sendbuffer, int *size) {
 846         int numbytes = 0;
 847
 848         if((numbytes = send(sd, control, sizeof(char), MSG_NOSIGNAL)) < sizeof(char)) {
 849                 printf("%s() Error: in sending PREFETCH RESPONSE to Coordinator at %s, %d\n", __func__, __FILE__, __LINE__);
 850                 free(sendbuffer);
 851                 return -1;
 852         }
 853
 854         /* Send the buffer with its size */
 855         if((numbytes = send(sd, sendbuffer, *(size), MSG_NOSIGNAL)) < *(size)) {
 856                 printf("%s() Error: in sending oid found at %s, %d size sent = %d, actual size = %d\n",
 857                                 __func__, __FILE__, __LINE__, numbytes, *(size));
 858                 free(sendbuffer);
 859                 return -1;
 860         }
 861
 862         free(sendbuffer);
 863         return 0;
 864 }
 865
 866 void processReqNotify(unsigned int numoid, unsigned int *oidarry, unsigned short *versionarry, unsigned int mid, unsigned int threadid) {
 867         objheader_t *header;
 868         unsigned int oid;
 869         unsigned short newversion;
 870         char msg[1+  2 * sizeof(unsigned int) + sizeof(unsigned short)];
 871         int sd;
 872         struct sockaddr_in remoteAddr;
 873         int bytesSent;
 874         int size;
 875
 876         int i = 0;
 877         while(i < numoid) {
 878                 oid = *(oidarry + i);
 879                 if((header = (objheader_t *) mhashSearch(oid)) == NULL) {
 880                         printf("Error: mhashsearch returns NULL at %s, %d\n", __FILE__, __LINE__);
 881                         return;
 882                 } else {
 883                         /* Check to see if versions are same */
 884 checkversion:
 885                         if ((STATUS(header) & LOCK) != LOCK) {
 886                                 //FIXME make locking atomic
 887                                 STATUS(header) |= LOCK;
 888                                 newversion = header->version;
 889                                 if(newversion == *(versionarry + i)) {
 890                                         //Add to the notify list
 891                                         if((header->notifylist = insNode(header->notifylist, threadid, mid)) == NULL) {
 892                                                 printf("Error: Obj notify list points to NULL %s, %d\n", __FILE__, __LINE__);
 893                                                 return;
 894                                         }
 895                                         STATUS(header) &= ~(LOCK);
 896                                 } else {
 897                                         STATUS(header) &= ~(LOCK);
 898                                         if ((sd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
 899                                                 perror("processReqNotify():socket()");
 900                                                 return;
 901                                         }
 902                                         bzero(&remoteAddr, sizeof(remoteAddr));
 903                                         remoteAddr.sin_family = AF_INET;
 904                                         remoteAddr.sin_port = htons(LISTEN_PORT);
 905                                         remoteAddr.sin_addr.s_addr = htonl(mid);
 906
 907                                         if (connect(sd, (struct sockaddr *)&remoteAddr, sizeof(remoteAddr)) < 0){
 908                                                 printf("Error: processReqNotify():error %d connecting to %s:%d\n", errno,
 909                                                                 inet_ntoa(remoteAddr.sin_addr), LISTEN_PORT);
 910                                                 close(sd);
 911                                                 return;
 912                                         } else {
 913                                                 //Send Update notification
 914                                                 msg[0] = THREAD_NOTIFY_RESPONSE;
 915                                                 *((unsigned int *)&msg[1]) = oid;
 916                                                 size = sizeof(unsigned int);
 917                                                 *((unsigned short *)(&msg[1]+size)) = newversion;
 918                                                 size += sizeof(unsigned short);
 919                                                 *((unsigned int *)(&msg[1]+size)) = threadid;
 920                                                 bytesSent = send(sd, msg, 1+ 2*sizeof(unsigned int) + sizeof(unsigned short), 0);
 921                                                 if (bytesSent < 0){
 922                                                         perror("processReqNotify():send()");
 923                                                         close(sd);
 924                                                         return;
 925                                                 } else if (bytesSent != 1 + sizeof(unsigned short) + 2*sizeof(unsigned int)){
 926                                                         printf("Error: processReqNotify(): error, sent %d bytes %s, %d\n",
 927                                                                         bytesSent, __FILE__, __LINE__);
 928                                                         close(sd);
 929                                                         return;
 930                                                 } else {
 931                                                         close(sd);
 932                                                         return;
 933                                                 }
 934
 935                                         }
 936                                         close(sd);
 937                                 }
 938                         } else {
 939                                 randomdelay();
 940                                 goto checkversion;
 941                         }
 942                 }
 943                 i++;
 944         }
 945         free(oidarry);
 946         free(versionarry);
 947 }
 948