src/simix/smx_process.c

   1 /* Copyright (c) 2007-2014. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   4 /* This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the license (GNU LGPL) which comes with this package. */
   6
   7 #include "smx_private.h"
   8 #include "xbt/sysdep.h"
   9 #include "xbt/log.h"
  10 #include "xbt/dict.h"
  11 #include "mc/mc.h"
  12 #include "mc/mc_replay.h"
  13 #include "mc/mc_client.h"
  14
  15 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_process, simix,
  16                                 "Logging specific to SIMIX (process)");
  17
  18 unsigned long simix_process_maxpid = 0;
  19
  20 /**
  21  * \brief Returns the current agent.
  22  *
  23  * This functions returns the currently running SIMIX process.
  24  *
  25  * \return The SIMIX process
  26  */
  27 XBT_INLINE smx_process_t SIMIX_process_self(void)
  28 {
  29   smx_context_t self_context = SIMIX_context_self();
  30
  31   return self_context ? SIMIX_context_get_process(self_context) : NULL;
  32 }
  33
  34 /**
  35  * \brief Returns whether a process has pending asynchronous communications.
  36  * \return true if there are asynchronous communications in this process
  37  */
  38 int SIMIX_process_has_pending_comms(smx_process_t process) {
  39
  40   return xbt_fifo_size(process->comms) > 0;
  41 }
  42
  43 /**
  44  * \brief Moves a process to the list of processes to destroy.
  45  */
  46 void SIMIX_process_cleanup(smx_process_t process)
  47 {
  48   XBT_DEBUG("Cleanup process %s (%p), waiting synchro %p",
  49       process->name, process, process->waiting_synchro);
  50
  51   SIMIX_process_on_exit_runall(process);
  52
  53   /* Unregister from the kill timer if any */
  54   if (process->kill_timer != NULL)
  55           SIMIX_timer_remove(process->kill_timer);
  56
  57   xbt_os_mutex_acquire(simix_global->mutex);
  58
  59   /* cancel non-blocking communications */
  60   smx_synchro_t synchro;
  61   while ((synchro = xbt_fifo_pop(process->comms))) {
  62
  63     /* make sure no one will finish the comm after this process is destroyed,
  64      * because src_proc or dst_proc would be an invalid pointer */
  65     SIMIX_comm_cancel(synchro);
  66
  67     if (synchro->comm.src_proc == process) {
  68       XBT_DEBUG("Found an unfinished send comm %p (detached = %d), state %d, src = %p, dst = %p",
  69           synchro, synchro->comm.detached, (int)synchro->state, synchro->comm.src_proc, synchro->comm.dst_proc);
  70       synchro->comm.src_proc = NULL;
  71
  72       /* I'm not supposed to destroy a detached comm from the sender side, */
  73       if (!synchro->comm.detached)
  74         SIMIX_comm_destroy(synchro);
  75       else
  76         XBT_DEBUG("Don't destroy it since it's a detached comm");
  77
  78     }
  79     else if (synchro->comm.dst_proc == process){
  80       XBT_DEBUG("Found an unfinished recv comm %p, state %d, src = %p, dst = %p",
  81           synchro, (int)synchro->state, synchro->comm.src_proc, synchro->comm.dst_proc);
  82       synchro->comm.dst_proc = NULL;
  83
  84       if (synchro->comm.detached && synchro->comm.refcount == 1
  85           && synchro->comm.src_proc != NULL) {
  86         /* the comm will be freed right now, remove it from the sender */
  87         xbt_fifo_remove(synchro->comm.src_proc->comms, synchro);
  88       }
  89       SIMIX_comm_destroy(synchro);
  90     }
  91     else {
  92       xbt_die("Communication synchro %p is in my list but I'm not the sender "
  93           "or the receiver", synchro);
  94     }
  95   }
  96
  97   XBT_DEBUG("%p should not be run anymore",process);
  98   xbt_swag_remove(process, simix_global->process_list);
  99   xbt_swag_remove(process, SIMIX_host_priv(process->host)->process_list);
 100   xbt_swag_insert(process, simix_global->process_to_destroy);
 101   process->context->iwannadie = 0;
 102
 103   xbt_os_mutex_release(simix_global->mutex);
 104 }
 105
 106 /**
 107  * Garbage collection
 108  *
 109  * Should be called some time to time to free the memory allocated for processes
 110  * that have finished (or killed).
 111  */
 112 void SIMIX_process_empty_trash(void)
 113 {
 114   smx_process_t process = NULL;
 115
 116   while ((process = xbt_swag_extract(simix_global->process_to_destroy))) {
 117     XBT_DEBUG("Getting rid of %p",process);
 118
 119     SIMIX_context_free(process->context);
 120
 121     /* Free the exception allocated at creation time */
 122     free(process->running_ctx);
 123     xbt_dict_free(&process->properties);
 124
 125     xbt_fifo_free(process->comms);
 126
 127     xbt_dynar_free(&process->on_exit);
 128
 129     xbt_free(process->name);
 130     xbt_free(process);
 131   }
 132 }
 133
 134 /**
 135  * \brief Creates and runs the maestro process
 136  */
 137 void SIMIX_create_maestro_process()
 138 {
 139   smx_process_t maestro = NULL;
 140
 141   /* Create maestro process and intilialize it */
 142   maestro = xbt_new0(s_smx_process_t, 1);
 143   maestro->pid = simix_process_maxpid++;
 144   maestro->ppid = -1;
 145   maestro->name = (char *) "";
 146   maestro->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 147   XBT_RUNNING_CTX_INITIALIZE(maestro->running_ctx);
 148   maestro->context = SIMIX_context_new(NULL, 0, NULL, NULL, maestro);
 149   maestro->simcall.issuer = maestro;
 150   simix_global->maestro_process = maestro;
 151   return;
 152 }
 153 /**
 154  * \brief Stops a process.
 155  *
 156  * Stops the process, execute all the registered on_exit functions,
 157  * register it to the list of the process to restart if needed
 158  * and stops its context.
 159  */
 160 void SIMIX_process_stop(smx_process_t arg) {
 161   /* execute the on_exit functions */
 162   SIMIX_process_on_exit_runall(arg);
 163   /* Add the process to the list of process to restart, only if
 164    * the host is down
 165    */
 166   if (arg->auto_restart && !SIMIX_host_get_state(arg->host)) {
 167     SIMIX_host_add_auto_restart_process(arg->host,arg->name,arg->code, arg->data,
 168                                         sg_host_name(arg->host),
 169                                         SIMIX_timer_get_date(arg->kill_timer),
 170                                         arg->argc,arg->argv,arg->properties,
 171                                         arg->auto_restart);
 172   }
 173   XBT_DEBUG("Process %s (%s) is dead",arg->name,sg_host_name(arg->host));
 174   /* stop the context */
 175   SIMIX_context_stop(arg->context);
 176 }
 177
 178 /**
 179  * \brief Same as SIMIX_process_create() but with only one argument (used by timers).
 180  * This function frees the argument.
 181  * \return the process created
 182  */
 183 smx_process_t SIMIX_process_create_from_wrapper(smx_process_arg_t args) {
 184
 185   smx_process_t process;
 186   simix_global->create_process_function(&process,
 187                                         args->name,
 188                                         args->code,
 189                                         args->data,
 190                                         args->hostname,
 191                                         args->kill_time,
 192                                         args->argc,
 193                                         args->argv,
 194                                         args->properties,
 195                                         args->auto_restart,
 196                                         NULL);
 197   xbt_free(args);
 198   return process;
 199 }
 200
 201
 202 void simcall_HANDLER_process_create(smx_simcall_t simcall,
 203                           smx_process_t *process,
 204                           const char *name,
 205                           xbt_main_func_t code,
 206                           void *data,
 207                           const char *hostname,
 208                           double kill_time,
 209                           int argc, char **argv,
 210                           xbt_dict_t properties,
 211                           int auto_restart){
 212   SIMIX_process_create(process, name, code, data, hostname,
 213                        kill_time, argc, argv, properties, auto_restart,
 214                        simcall->issuer);
 215 }
 216 /**
 217  * \brief Internal function to create a process.
 218  *
 219  * This function actually creates the process.
 220  * It may be called when a SIMCALL_PROCESS_CREATE simcall occurs,
 221  * or directly for SIMIX internal purposes. The sure thing is that it's called from maestro context.
 222  *
 223  * \return the process created
 224  */
 225 void SIMIX_process_create(smx_process_t *process,
 226                           const char *name,
 227                           xbt_main_func_t code,
 228                           void *data,
 229                           const char *hostname,
 230                           double kill_time,
 231                           int argc, char **argv,
 232                           xbt_dict_t properties,
 233                           int auto_restart,
 234                           smx_process_t parent_process)
 235 {
 236   *process = NULL;
 237   sg_host_t host = SIMIX_host_get_by_name(hostname);
 238
 239   XBT_DEBUG("Start process %s on host '%s'", name, hostname);
 240
 241   if (!SIMIX_host_get_state(host)) {
 242     int i;
 243     XBT_WARN("Cannot launch process '%s' on failed host '%s'", name,
 244           hostname);
 245     for (i = 0; i < argc; i++)
 246       xbt_free(argv[i]);
 247     xbt_free(argv);
 248   }
 249   else {
 250     *process = xbt_new0(s_smx_process_t, 1);
 251
 252     xbt_assert(((code != NULL) && (host != NULL)), "Invalid parameters");
 253     /* Process data */
 254     (*process)->pid = simix_process_maxpid++;
 255     (*process)->name = xbt_strdup(name);
 256     (*process)->host = host;
 257     (*process)->data = data;
 258     (*process)->comms = xbt_fifo_new();
 259     (*process)->simcall.issuer = *process;
 260
 261      if (parent_process) {
 262        (*process)->ppid = SIMIX_process_get_PID(parent_process);
 263      } else {
 264        (*process)->ppid = -1;
 265      }
 266
 267     /* Process data for auto-restart */
 268     (*process)->auto_restart = auto_restart;
 269     (*process)->code = code;
 270     (*process)->argc = argc;
 271     (*process)->argv = argv;
 272
 273
 274     XBT_VERB("Create context %s", (*process)->name);
 275     (*process)->context = SIMIX_context_new(code, argc, argv,
 276       simix_global->cleanup_process_function, *process);
 277
 278     (*process)->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 279     XBT_RUNNING_CTX_INITIALIZE((*process)->running_ctx);
 280
 281     if(MC_is_active()){
 282       MC_ignore_heap((*process)->running_ctx, sizeof(*(*process)->running_ctx));
 283     }
 284
 285     /* Add properties */
 286     (*process)->properties = properties;
 287
 288     /* Add the process to it's host process list */
 289     xbt_swag_insert(*process, SIMIX_host_priv(host)->process_list);
 290
 291     XBT_DEBUG("Start context '%s'", (*process)->name);
 292
 293     /* Now insert it in the global process list and in the process to run list */
 294     xbt_swag_insert(*process, simix_global->process_list);
 295     XBT_DEBUG("Inserting %s(%s) in the to_run list", (*process)->name, sg_host_name(host));
 296     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, *process);
 297
 298     if (kill_time > SIMIX_get_clock() && simix_global->kill_process_function) {
 299       XBT_DEBUG("Process %s(%s) will be kill at time %f", (*process)->name,
 300           sg_host_name((*process)->host), kill_time);
 301       (*process)->kill_timer = SIMIX_timer_set(kill_time, simix_global->kill_process_function, *process);
 302     }
 303   }
 304 }
 305
 306 /**
 307  * \brief Executes the processes from simix_global->process_to_run.
 308  *
 309  * The processes of simix_global->process_to_run are run (in parallel if
 310  * possible).  On exit, simix_global->process_to_run is empty, and
 311  * simix_global->process_that_ran contains the list of processes that just ran.
 312  * The two lists are swapped so, be careful when using them before and after a
 313  * call to this function.
 314  */
 315 void SIMIX_process_runall(void)
 316 {
 317   SIMIX_context_runall();
 318
 319   xbt_dynar_t tmp = simix_global->process_that_ran;
 320   simix_global->process_that_ran = simix_global->process_to_run;
 321   simix_global->process_to_run = tmp;
 322   xbt_dynar_reset(simix_global->process_to_run);
 323 }
 324
 325 void simcall_HANDLER_process_kill(smx_simcall_t simcall, smx_process_t process) {
 326   SIMIX_process_kill(process, simcall->issuer);
 327 }
 328 /**
 329  * \brief Internal function to kill a SIMIX process.
 330  *
 331  * This function may be called when a SIMCALL_PROCESS_KILL simcall occurs,
 332  * or directly for SIMIX internal purposes.
 333  *
 334  * \param process poor victim
 335  * \param issuer the process which has sent the PROCESS_KILL. Important to not schedule twice the same process.
 336  */
 337 void SIMIX_process_kill(smx_process_t process, smx_process_t issuer) {
 338
 339   XBT_DEBUG("Killing process %s on %s", process->name, sg_host_name(process->host));
 340
 341   process->context->iwannadie = 1;
 342   process->blocked = 0;
 343   process->suspended = 0;
 344   process->doexception = 0;
 345
 346   /* destroy the blocking synchro if any */
 347   if (process->waiting_synchro) {
 348
 349     switch (process->waiting_synchro->type) {
 350
 351     case SIMIX_SYNC_EXECUTE:
 352     case SIMIX_SYNC_PARALLEL_EXECUTE:
 353       SIMIX_host_execution_destroy(process->waiting_synchro);
 354       break;
 355
 356     case SIMIX_SYNC_COMMUNICATE:
 357       xbt_fifo_remove(process->comms, process->waiting_synchro);
 358       SIMIX_comm_cancel(process->waiting_synchro);
 359       xbt_fifo_remove(process->waiting_synchro->simcalls, &process->simcall);
 360       SIMIX_comm_destroy(process->waiting_synchro);
 361       break;
 362
 363     case SIMIX_SYNC_SLEEP:
 364       SIMIX_process_sleep_destroy(process->waiting_synchro);
 365       break;
 366
 367     case SIMIX_SYNC_JOIN:
 368       SIMIX_process_sleep_destroy(process->waiting_synchro);
 369       break;
 370
 371     case SIMIX_SYNC_SYNCHRO:
 372       SIMIX_synchro_stop_waiting(process, &process->simcall);
 373       SIMIX_synchro_destroy(process->waiting_synchro);
 374       break;
 375
 376     case SIMIX_SYNC_IO:
 377       SIMIX_io_destroy(process->waiting_synchro);
 378       break;
 379
 380     }
 381
 382     process->waiting_synchro = NULL;
 383   }
 384   if(!xbt_dynar_member(simix_global->process_to_run, &(process)) && process != issuer) {
 385     XBT_DEBUG("Inserting %s in the to_run list", process->name);
 386     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, process);
 387   }
 388
 389 }
 390
 391 /** @brief Ask another process to raise the given exception
 392  *
 393  * @param cat category of exception
 394  * @param value value associated to the exception
 395  * @param msg string information associated to the exception
 396  */
 397 void SIMIX_process_throw(smx_process_t process, xbt_errcat_t cat, int value, const char *msg) {
 398   SMX_EXCEPTION(process, cat, value, msg);
 399
 400   if (process->suspended)
 401     SIMIX_process_resume(process,SIMIX_process_self());
 402
 403   /* cancel the blocking synchro if any */
 404   if (process->waiting_synchro) {
 405
 406     switch (process->waiting_synchro->type) {
 407
 408     case SIMIX_SYNC_EXECUTE:
 409     case SIMIX_SYNC_PARALLEL_EXECUTE:
 410       SIMIX_host_execution_cancel(process->waiting_synchro);
 411       break;
 412
 413     case SIMIX_SYNC_COMMUNICATE:
 414       xbt_fifo_remove(process->comms, process->waiting_synchro);
 415       SIMIX_comm_cancel(process->waiting_synchro);
 416       break;
 417
 418     case SIMIX_SYNC_SLEEP:
 419     case SIMIX_SYNC_JOIN:
 420       SIMIX_process_sleep_destroy(process->waiting_synchro);
 421       if (!xbt_dynar_member(simix_global->process_to_run, &(process)) && process != SIMIX_process_self()) {
 422         XBT_DEBUG("Inserting %s in the to_run list", process->name);
 423         xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, process);
 424       }
 425       break;
 426
 427     case SIMIX_SYNC_SYNCHRO:
 428       SIMIX_synchro_stop_waiting(process, &process->simcall);
 429       break;
 430
 431     case SIMIX_SYNC_IO:
 432       SIMIX_io_destroy(process->waiting_synchro);
 433       break;
 434
 435     }
 436   }
 437   process->waiting_synchro = NULL;
 438
 439 }
 440
 441 void simcall_HANDLER_process_killall(smx_simcall_t simcall, int reset_pid) {
 442   SIMIX_process_killall(simcall->issuer, reset_pid);
 443 }
 444 /**
 445  * \brief Kills all running processes.
 446  * \param issuer this one will not be killed
 447  */
 448 void SIMIX_process_killall(smx_process_t issuer, int reset_pid)
 449 {
 450   smx_process_t p = NULL;
 451
 452   while ((p = xbt_swag_extract(simix_global->process_list))) {
 453     if (p != issuer) {
 454       SIMIX_process_kill(p,issuer);
 455     }
 456   }
 457
 458   if (reset_pid > 0)
 459     simix_process_maxpid = reset_pid;
 460
 461   SIMIX_context_runall();
 462
 463   SIMIX_process_empty_trash();
 464 }
 465
 466 void simcall_HANDLER_process_change_host(smx_simcall_t simcall, smx_process_t process,
 467                                    sg_host_t dest)
 468 {
 469   process->new_host = dest;
 470 }
 471 void SIMIX_process_change_host(smx_process_t process,
 472              sg_host_t dest)
 473 {
 474   xbt_assert((process != NULL), "Invalid parameters");
 475   xbt_swag_remove(process, SIMIX_host_priv(process->host)->process_list);
 476   process->host = dest;
 477   xbt_swag_insert(process, SIMIX_host_priv(dest)->process_list);
 478 }
 479
 480
 481 void simcall_HANDLER_process_suspend(smx_simcall_t simcall, smx_process_t process)
 482 {
 483   smx_synchro_t sync_suspend =
 484       SIMIX_process_suspend(process, simcall->issuer);
 485
 486   if (process != simcall->issuer) {
 487     SIMIX_simcall_answer(simcall);
 488   } else {
 489     xbt_fifo_push(sync_suspend->simcalls, simcall);
 490     process->waiting_synchro = sync_suspend;
 491     SIMIX_host_execution_suspend(process->waiting_synchro);
 492   }
 493   /* If we are suspending ourselves, then just do not finish the simcall now */
 494 }
 495
 496 smx_synchro_t SIMIX_process_suspend(smx_process_t process, smx_process_t issuer)
 497 {
 498   xbt_assert((process != NULL), "Invalid parameters");
 499
 500   if (process->suspended) {
 501     XBT_DEBUG("Process '%s' is already suspended", process->name);
 502     return NULL;
 503   }
 504
 505   process->suspended = 1;
 506
 507   /* If we are suspending another process, and it is waiting on a sync,
 508      suspend its synchronization. */
 509   if (process != issuer) {
 510
 511     if (process->waiting_synchro) {
 512
 513       switch (process->waiting_synchro->type) {
 514
 515         case SIMIX_SYNC_EXECUTE:
 516         case SIMIX_SYNC_PARALLEL_EXECUTE:
 517           SIMIX_host_execution_suspend(process->waiting_synchro);
 518           break;
 519
 520         case SIMIX_SYNC_COMMUNICATE:
 521           SIMIX_comm_suspend(process->waiting_synchro);
 522           break;
 523
 524         case SIMIX_SYNC_SLEEP:
 525           SIMIX_process_sleep_suspend(process->waiting_synchro);
 526           break;
 527
 528         case SIMIX_SYNC_SYNCHRO:
 529           /* Suspension is delayed to when the process is rescheduled. */
 530           break;
 531
 532         default:
 533           xbt_die("Internal error in SIMIX_process_suspend: unexpected synchronization type %d",
 534               (int)process->waiting_synchro->type);
 535       }
 536       return NULL;
 537     } else {
 538       /* Suspension is delayed to when the process is rescheduled. */
 539       return NULL;
 540     }
 541   } else {
 542     /* FIXME: computation size is zero. Is it okay that bound is zero ? */
 543     return SIMIX_host_execute("suspend", process->host, 0.0, 1.0, 0.0, 0);
 544   }
 545 }
 546
 547 void simcall_HANDLER_process_resume(smx_simcall_t simcall, smx_process_t process){
 548   SIMIX_process_resume(process, simcall->issuer);
 549 }
 550
 551 void SIMIX_process_resume(smx_process_t process, smx_process_t issuer)
 552 {
 553   XBT_IN("process = %p, issuer = %p", process, issuer);
 554
 555   if(process->context->iwannadie) {
 556     XBT_VERB("Ignoring request to suspend a process that is currently dying.");
 557     return;
 558   }
 559
 560   if(!process->suspended) return;
 561   process->suspended = 0;
 562
 563   /* If we are resuming another process, resume the synchronization it was waiting for
 564      if any. Otherwise add it to the list of process to run in the next round. */
 565   if (process != issuer) {
 566
 567     if (process->waiting_synchro) {
 568
 569       switch (process->waiting_synchro->type) {
 570
 571         case SIMIX_SYNC_EXECUTE:
 572         case SIMIX_SYNC_PARALLEL_EXECUTE:
 573           SIMIX_host_execution_resume(process->waiting_synchro);
 574           break;
 575
 576         case SIMIX_SYNC_COMMUNICATE:
 577           SIMIX_comm_resume(process->waiting_synchro);
 578           break;
 579
 580         case SIMIX_SYNC_SLEEP:
 581           SIMIX_process_sleep_resume(process->waiting_synchro);
 582           break;
 583
 584         case SIMIX_SYNC_SYNCHRO:
 585           /* I cannot resume it now. This is delayed to when the process is rescheduled at
 586            * the end of the synchro. */
 587           break;
 588
 589         default:
 590           xbt_die("Internal error in SIMIX_process_resume: unexpected synchronization type %d",
 591               (int)process->waiting_synchro->type);
 592       }
 593     }
 594   } else XBT_WARN("Strange. Process %p is trying to resume himself.", issuer);
 595
 596   XBT_OUT();
 597 }
 598
 599 int SIMIX_process_get_maxpid(void) {
 600   return simix_process_maxpid;
 601 }
 602
 603 int SIMIX_process_count(void)
 604 {
 605   return xbt_swag_size(simix_global->process_list);
 606 }
 607
 608 int SIMIX_process_get_PID(smx_process_t self){
 609   if (self == NULL)
 610     return 0;
 611   else
 612     return self->pid;
 613 }
 614
 615 int SIMIX_process_get_PPID(smx_process_t self){
 616   if (self == NULL)
 617     return 0;
 618   else
 619     return self->ppid;
 620 }
 621
 622 void* SIMIX_process_self_get_data(smx_process_t self)
 623 {
 624   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 625
 626   if (!self) {
 627     return NULL;
 628   }
 629   return SIMIX_process_get_data(self);
 630 }
 631
 632 void SIMIX_process_self_set_data(smx_process_t self, void *data)
 633 {
 634   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 635
 636   SIMIX_process_set_data(self, data);
 637 }
 638
 639 void* SIMIX_process_get_data(smx_process_t process)
 640 {
 641   return process->data;
 642 }
 643
 644 void SIMIX_process_set_data(smx_process_t process, void *data)
 645 {
 646   process->data = data;
 647 }
 648
 649 sg_host_t SIMIX_process_get_host(smx_process_t process)
 650 {
 651   return process->host;
 652 }
 653
 654 /* needs to be public and without simcall because it is called
 655    by exceptions and logging events */
 656 const char* SIMIX_process_self_get_name(void) {
 657
 658   smx_process_t process = SIMIX_process_self();
 659   if (process == NULL || process == simix_global->maestro_process)
 660     return "";
 661
 662   return SIMIX_process_get_name(process);
 663 }
 664
 665 const char* SIMIX_process_get_name(smx_process_t process)
 666 {
 667   return process->name;
 668 }
 669
 670 smx_process_t SIMIX_process_get_by_name(const char* name)
 671 {
 672   smx_process_t proc;
 673
 674   xbt_swag_foreach(proc, simix_global->process_list)
 675   {
 676     if(!strcmp(name, proc->name))
 677       return proc;
 678   }
 679   return NULL;
 680 }
 681
 682 int SIMIX_process_is_suspended(smx_process_t process)
 683 {
 684   return process->suspended;
 685 }
 686
 687 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
 688 {
 689   return process->properties;
 690 }
 691
 692 void simcall_HANDLER_process_join(smx_simcall_t simcall, smx_process_t process, double timeout)
 693 {
 694   smx_synchro_t sync = SIMIX_process_join(simcall->issuer, process, timeout);
 695   xbt_fifo_push(sync->simcalls, simcall);
 696   simcall->issuer->waiting_synchro = sync;
 697 }
 698
 699 static int SIMIX_process_join_finish(smx_process_exit_status_t status, smx_synchro_t sync){
 700   if (sync->sleep.surf_sleep) {
 701     surf_action_cancel(sync->sleep.surf_sleep);
 702
 703     smx_simcall_t simcall;
 704     while ((simcall = xbt_fifo_shift(sync->simcalls))) {
 705       simcall_process_sleep__set__result(simcall, SIMIX_DONE);
 706       simcall->issuer->waiting_synchro = NULL;
 707       if (simcall->issuer->suspended) {
 708         XBT_DEBUG("Wait! This process is suspended and can't wake up now.");
 709         simcall->issuer->suspended = 0;
 710         simcall_HANDLER_process_suspend(simcall, simcall->issuer);
 711       } else {
 712         SIMIX_simcall_answer(simcall);
 713       }
 714     }
 715     surf_action_unref(sync->sleep.surf_sleep);
 716     sync->sleep.surf_sleep = NULL;
 717   }
 718   xbt_mallocator_release(simix_global->synchro_mallocator, sync);
 719   return 0;
 720 }
 721
 722 smx_synchro_t SIMIX_process_join(smx_process_t issuer, smx_process_t process, double timeout)
 723 {
 724   smx_synchro_t res = SIMIX_process_sleep(issuer, timeout);
 725   res->type = SIMIX_SYNC_JOIN;
 726   SIMIX_process_on_exit(process, (int_f_pvoid_pvoid_t)SIMIX_process_join_finish, res);
 727   return res;
 728 }
 729
 730 void simcall_HANDLER_process_sleep(smx_simcall_t simcall, double duration)
 731 {
 732   if (MC_is_active() || MC_record_replay_is_active()) {
 733     MC_process_clock_add(simcall->issuer, duration);
 734     simcall_process_sleep__set__result(simcall, SIMIX_DONE);
 735     SIMIX_simcall_answer(simcall);
 736     return;
 737   }
 738   smx_synchro_t sync = SIMIX_process_sleep(simcall->issuer, duration);
 739   xbt_fifo_push(sync->simcalls, simcall);
 740   simcall->issuer->waiting_synchro = sync;
 741 }
 742
 743 smx_synchro_t SIMIX_process_sleep(smx_process_t process, double duration)
 744 {
 745   smx_synchro_t synchro;
 746   sg_host_t host = process->host;
 747
 748   /* check if the host is active */
 749   if (surf_host_get_state(surf_host_resource_priv(host)) != SURF_RESOURCE_ON) {
 750     THROWF(host_error, 0, "Host %s failed, you cannot call this function",
 751            sg_host_name(host));
 752   }
 753
 754   synchro = xbt_mallocator_get(simix_global->synchro_mallocator);
 755   synchro->type = SIMIX_SYNC_SLEEP;
 756   synchro->name = NULL;
 757   synchro->category = NULL;
 758
 759   synchro->sleep.host = host;
 760   synchro->sleep.surf_sleep = surf_host_sleep(host, duration);
 761
 762   surf_action_set_data(synchro->sleep.surf_sleep, synchro);
 763   XBT_DEBUG("Create sleep synchronization %p", synchro);
 764
 765   return synchro;
 766 }
 767
 768 void SIMIX_post_process_sleep(smx_synchro_t synchro)
 769 {
 770   smx_simcall_t simcall;
 771   e_smx_state_t state;
 772   xbt_assert(synchro->type == SIMIX_SYNC_SLEEP || synchro->type == SIMIX_SYNC_JOIN);
 773
 774   while ((simcall = xbt_fifo_shift(synchro->simcalls))) {
 775
 776     switch(surf_action_get_state(synchro->sleep.surf_sleep)){
 777       case SURF_ACTION_FAILED:
 778         simcall->issuer->context->iwannadie = 1;
 779         //SMX_EXCEPTION(simcall->issuer, host_error, 0, "Host failed");
 780         state = SIMIX_SRC_HOST_FAILURE;
 781         break;
 782
 783       case SURF_ACTION_DONE:
 784         state = SIMIX_DONE;
 785         break;
 786
 787       default:
 788         THROW_IMPOSSIBLE;
 789         break;
 790     }
 791     if (surf_host_get_state(surf_host_resource_priv(simcall->issuer->host)) != SURF_RESOURCE_ON) {
 792       simcall->issuer->context->iwannadie = 1;
 793     }
 794     simcall_process_sleep__set__result(simcall, state);
 795     simcall->issuer->waiting_synchro = NULL;
 796     if (simcall->issuer->suspended) {
 797       XBT_DEBUG("Wait! This process is suspended and can't wake up now.");
 798       simcall->issuer->suspended = 0;
 799       simcall_HANDLER_process_suspend(simcall, simcall->issuer);
 800     } else {
 801       SIMIX_simcall_answer(simcall);
 802     }
 803   }
 804
 805   SIMIX_process_sleep_destroy(synchro);
 806 }
 807
 808 void SIMIX_process_sleep_destroy(smx_synchro_t synchro)
 809 {
 810   XBT_DEBUG("Destroy synchro %p", synchro);
 811   xbt_assert(synchro->type == SIMIX_SYNC_SLEEP || synchro->type == SIMIX_SYNC_JOIN);
 812
 813   if (synchro->sleep.surf_sleep) {
 814     surf_action_unref(synchro->sleep.surf_sleep);
 815     synchro->sleep.surf_sleep = NULL;
 816   }
 817   if (synchro->type == SIMIX_SYNC_SLEEP)
 818     xbt_mallocator_release(simix_global->synchro_mallocator, synchro);
 819 }
 820
 821 void SIMIX_process_sleep_suspend(smx_synchro_t synchro)
 822 {
 823   xbt_assert(synchro->type == SIMIX_SYNC_SLEEP);
 824   surf_action_suspend(synchro->sleep.surf_sleep);
 825 }
 826
 827 void SIMIX_process_sleep_resume(smx_synchro_t synchro)
 828 {
 829   XBT_DEBUG("Synchro state is %d on process_sleep_resume.", synchro->state);
 830   xbt_assert(synchro->type == SIMIX_SYNC_SLEEP);
 831   surf_action_resume(synchro->sleep.surf_sleep);
 832 }
 833
 834 /**
 835  * \brief Calling this function makes the process to yield.
 836  *
 837  * Only the current process can call this function, giving back the control to
 838  * maestro.
 839  *
 840  * \param self the current process
 841  */
 842 void SIMIX_process_yield(smx_process_t self)
 843 {
 844   XBT_DEBUG("Yield process '%s'", self->name);
 845
 846   /* Go into sleep and return control to maestro */
 847   SIMIX_context_suspend(self->context);
 848
 849   /* Ok, maestro returned control to us */
 850   XBT_DEBUG("Control returned to me: '%s'", self->name);
 851
 852   if (self->new_host) {
 853     SIMIX_process_change_host(self, self->new_host);
 854     self->new_host = NULL;
 855   }
 856
 857   if (self->context->iwannadie){
 858     XBT_DEBUG("I wanna die!");
 859     SIMIX_process_stop(self);
 860   }
 861
 862   if (self->suspended) {
 863     XBT_DEBUG("Hey! I'm suspended.");
 864     xbt_assert(!self->doexception, "Gasp! This exception may be lost by subsequent calls.");
 865     self->suspended = 0;
 866     SIMIX_process_suspend(self, self);
 867   }
 868
 869   if (self->doexception) {
 870     XBT_DEBUG("Wait, maestro left me an exception");
 871     self->doexception = 0;
 872     SMX_THROW();
 873   }
 874
 875 }
 876
 877 /* callback: context fetching */
 878 xbt_running_ctx_t *SIMIX_process_get_running_context(void)
 879 {
 880   return SIMIX_process_self()->running_ctx;
 881 }
 882
 883 /* callback: termination */
 884 void SIMIX_process_exception_terminate(xbt_ex_t * e)
 885 {
 886   xbt_ex_display(e);
 887   xbt_abort();
 888 }
 889
 890 smx_context_t SIMIX_process_get_context(smx_process_t p) {
 891   return p->context;
 892 }
 893
 894 void SIMIX_process_set_context(smx_process_t p,smx_context_t c) {
 895   p->context = c;
 896 }
 897
 898 /**
 899  * \brief Returns the list of processes to run.
 900  */
 901 xbt_dynar_t SIMIX_process_get_runnable(void)
 902 {
 903   return simix_global->process_to_run;
 904 }
 905
 906 /**
 907  * \brief Returns the process from PID.
 908  */
 909 smx_process_t SIMIX_process_from_PID(int PID)
 910 {
 911   smx_process_t proc;
 912   xbt_swag_foreach(proc, simix_global->process_list)
 913   {
 914    if(proc->pid == PID)
 915    return proc;
 916   }
 917   return NULL;
 918 }
 919
 920 /** @brief returns a dynar containg all currently existing processes */
 921 xbt_dynar_t SIMIX_processes_as_dynar(void) {
 922   smx_process_t proc;
 923   xbt_dynar_t res = xbt_dynar_new(sizeof(smx_process_t),NULL);
 924   xbt_swag_foreach(proc, simix_global->process_list) {
 925     xbt_dynar_push(res,&proc);
 926   }
 927   return res;
 928 }
 929
 930
 931 void SIMIX_process_on_exit_runall(smx_process_t process) {
 932   s_smx_process_exit_fun_t exit_fun;
 933   smx_process_exit_status_t exit_status = (process->context->iwannadie) ?
 934                                          SMX_EXIT_FAILURE : SMX_EXIT_SUCCESS;
 935   while (!xbt_dynar_is_empty(process->on_exit)) {
 936     exit_fun = xbt_dynar_pop_as(process->on_exit,s_smx_process_exit_fun_t);
 937     (exit_fun.fun)((void*)exit_status, exit_fun.arg);
 938   }
 939 }
 940
 941 void SIMIX_process_on_exit(smx_process_t process, int_f_pvoid_pvoid_t fun, void *data) {
 942   xbt_assert(process, "current process not found: are you in maestro context ?");
 943
 944   if (!process->on_exit) {
 945     process->on_exit = xbt_dynar_new(sizeof(s_smx_process_exit_fun_t), NULL);
 946   }
 947
 948   s_smx_process_exit_fun_t exit_fun = {fun, data};
 949
 950   xbt_dynar_push_as(process->on_exit,s_smx_process_exit_fun_t,exit_fun);
 951 }
 952
 953 /**
 954  * \brief Sets the auto-restart status of the process.
 955  * If set to 1, the process will be automatically restarted when its host
 956  * comes back.
 957  */
 958 void SIMIX_process_auto_restart_set(smx_process_t process, int auto_restart) {
 959   process->auto_restart = auto_restart;
 960 }
 961
 962 smx_process_t simcall_HANDLER_process_restart(smx_simcall_t simcall, smx_process_t process) {
 963   return SIMIX_process_restart(process, simcall->issuer);
 964 }
 965 /** @brief Restart a process, starting it again from the beginning. */
 966 smx_process_t SIMIX_process_restart(smx_process_t process, smx_process_t issuer) {
 967   XBT_DEBUG("Restarting process %s on %s", process->name, sg_host_name(process->host));
 968   //retrieve the arguments of the old process
 969   //FIXME: Factorize this with SIMIX_host_add_auto_restart_process ?
 970   s_smx_process_arg_t arg;
 971   arg.code = process->code;
 972   arg.hostname = sg_host_name(process->host);
 973   arg.kill_time = SIMIX_timer_get_date(process->kill_timer);
 974   arg.argc = process->argc;
 975   arg.data = process->data;
 976   int i;
 977   arg.argv = xbt_new(char*,process->argc + 1);
 978   for (i = 0; i < arg.argc; i++) {
 979     arg.argv[i] = xbt_strdup(process->argv[i]);
 980   }
 981   arg.argv[process->argc] = NULL;
 982   arg.properties = NULL;
 983   arg.auto_restart = process->auto_restart;
 984   //kill the old process
 985   SIMIX_process_kill(process,issuer);
 986   //start the new process
 987   smx_process_t new_process;
 988   if (simix_global->create_process_function) {
 989     simix_global->create_process_function(&new_process,
 990                                           arg.argv[0],
 991                                           arg.code,
 992                                           arg.data,
 993                                           arg.hostname,
 994                                           arg.kill_time,
 995                                           arg.argc,
 996                                           arg.argv,
 997                                           arg.properties,
 998                                           arg.auto_restart,
 999                                           NULL);
1000   } else {
1001     simcall_process_create(&new_process,
1002                            arg.argv[0],
1003                            arg.code,
1004                            arg.data,
1005                            arg.hostname,
1006                            arg.kill_time,
1007                            arg.argc,
1008                            arg.argv,
1009                            arg.properties,
1010                            arg.auto_restart);
1011
1012   }
1013   return new_process;
1014 }