src/simix/smx_process.c

   1 /* Copyright (c) 2007-2012. 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
  13 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_process, simix,
  14                                 "Logging specific to SIMIX (process)");
  15
  16 unsigned long simix_process_maxpid = 0;
  17
  18 /**
  19  * \brief Returns the current agent.
  20  *
  21  * This functions returns the currently running SIMIX process.
  22  *
  23  * \return The SIMIX process
  24  */
  25 XBT_INLINE smx_process_t SIMIX_process_self(void)
  26 {
  27   smx_context_t self_context = SIMIX_context_self();
  28
  29   return self_context ? SIMIX_context_get_data(self_context) : NULL;
  30 }
  31
  32 /**
  33  * \brief Returns whether a process has pending asynchronous communications.
  34  * \return true if there are asynchronous communications in this process
  35  */
  36 int SIMIX_process_has_pending_comms(smx_process_t process) {
  37
  38   return xbt_fifo_size(process->comms) > 0;
  39 }
  40
  41 void SIMIX_pre_process_cleanup(smx_simcall_t simcall, smx_process_t process) {
  42   SIMIX_process_cleanup(process);
  43 }
  44 /**
  45  * \brief Moves a process to the list of processes to destroy.
  46  */
  47 void SIMIX_process_cleanup(smx_process_t process)
  48 {
  49   XBT_DEBUG("Cleanup process %s (%p), waiting action %p",
  50       process->name, process, process->waiting_action);
  51
  52   /* cancel non-blocking communications */
  53   smx_action_t action;
  54   while ((action = xbt_fifo_pop(process->comms))) {
  55
  56     /* make sure no one will finish the comm after this process is destroyed,
  57      * because src_proc or dst_proc would be an invalid pointer */
  58     SIMIX_comm_cancel(action);
  59
  60     if (action->comm.src_proc == process) {
  61       XBT_DEBUG("Found an unfinished send comm %p (detached = %d), state %d, src = %p, dst = %p",
  62           action, action->comm.detached, (int)action->state, action->comm.src_proc, action->comm.dst_proc);
  63       action->comm.src_proc = NULL;
  64
  65       if (action->comm.detached) {
  66          if (action->comm.refcount == 0) {
  67            XBT_DEBUG("Increase the refcount before destroying it since it's detached");
  68            /* I'm not supposed to destroy a detached comm from the sender side,
  69             * unless there is no receiver matching the rdv */
  70            action->comm.refcount++;
  71            SIMIX_comm_destroy(action);
  72          }
  73          else {
  74            XBT_DEBUG("Don't destroy it since its refcount is %d", action->comm.refcount);
  75          }
  76       } else {
  77         SIMIX_comm_destroy(action);
  78       }
  79     }
  80     else if (action->comm.dst_proc == process){
  81       XBT_DEBUG("Found an unfinished recv comm %p, state %d, src = %p, dst = %p",
  82           action, (int)action->state, action->comm.src_proc, action->comm.dst_proc);
  83       action->comm.dst_proc = NULL;
  84
  85       if (action->comm.detached && action->comm.refcount == 1
  86           && action->comm.src_proc != NULL) {
  87         /* the comm will be freed right now, remove it from the sender */
  88         xbt_fifo_remove(action->comm.src_proc->comms, action);
  89       }
  90       SIMIX_comm_destroy(action);
  91     }
  92     else {
  93       xbt_die("Communication action %p is in my list but I'm not the sender "
  94           "or the receiver", action);
  95     }
  96   }
  97
  98   /*xbt_swag_remove(process, simix_global->process_to_run);*/
  99   xbt_swag_remove(process, simix_global->process_list);
 100   xbt_swag_remove(process, process->smx_host->process_list);
 101   xbt_swag_insert(process, simix_global->process_to_destroy);
 102   process->context->iwannadie = 0;
 103 }
 104
 105 /**
 106  * Garbage collection
 107  *
 108  * Should be called some time to time to free the memory allocated for processes
 109  * that have finished (or killed).
 110  */
 111 void SIMIX_process_empty_trash(void)
 112 {
 113   smx_process_t process = NULL;
 114
 115   while ((process = xbt_swag_extract(simix_global->process_to_destroy))) {
 116     SIMIX_context_free(process->context);
 117
 118     /* Free the exception allocated at creation time */
 119     free(process->running_ctx);
 120     xbt_dict_free(&process->properties);
 121
 122     xbt_fifo_free(process->comms);
 123
 124     xbt_dynar_free(&process->on_exit);
 125
 126     free(process->name);
 127     free(process);
 128   }
 129 }
 130
 131 /**
 132  * \brief Creates and runs the maestro process
 133  */
 134 void SIMIX_create_maestro_process()
 135 {
 136   smx_process_t maestro = NULL;
 137
 138   /* Create maestro process and intilialize it */
 139   maestro = xbt_new0(s_smx_process_t, 1);
 140   maestro->pid = simix_process_maxpid++;
 141   maestro->name = (char *) "";
 142   maestro->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 143   XBT_RUNNING_CTX_INITIALIZE(maestro->running_ctx);
 144   maestro->context = SIMIX_context_new(NULL, 0, NULL, NULL, maestro);
 145   maestro->simcall.issuer = maestro;
 146
 147   simix_global->maestro_process = maestro;
 148   return;
 149 }
 150 /**
 151  * \brief Stops a process.
 152  *
 153  * Stops the process, execute all the registered on_exit functions,
 154  * register it to the list of the process to restart if needed
 155  * and stops its context.
 156  */
 157 void SIMIX_process_stop(smx_process_t arg) {
 158   /* execute the on_exit functions */
 159   SIMIX_process_on_exit_runall(arg);
 160   /* Add the process to the list of process to restart, only if
 161    * the host is down
 162    */
 163   if (arg->auto_restart && !SIMIX_host_get_state(arg->smx_host)) {
 164     SIMIX_host_add_auto_restart_process(arg->smx_host,arg->name,arg->code, arg->data,
 165                                         arg->smx_host->name,
 166                                         arg->kill_time,
 167                                         arg->argc,arg->argv,arg->properties,
 168                                         arg->auto_restart);
 169   }
 170   XBT_DEBUG("Process %s (%s) is dead",arg->name,arg->smx_host->name);
 171   /* stop the context */
 172   SIMIX_context_stop(arg->context);
 173 }
 174
 175 /**
 176  * \brief Same as SIMIX_process_create() but with only one argument (used by timers).
 177  * This function frees the argument.
 178  * \return the process created
 179  */
 180 smx_process_t SIMIX_process_create_from_wrapper(smx_process_arg_t args) {
 181
 182   smx_process_t process;
 183   simix_global->create_process_function(
 184       &process,
 185       args->name,
 186       args->code,
 187       args->data,
 188       args->hostname,
 189       args->kill_time,
 190       args->argc,
 191       args->argv,
 192       args->properties,
 193       args->auto_restart);
 194   xbt_free(args);
 195   return process;
 196 }
 197
 198
 199 void SIMIX_pre_process_create(smx_simcall_t simcall,
 200                           smx_process_t *process,
 201                           const char *name,
 202                           xbt_main_func_t code,
 203                           void *data,
 204                           const char *hostname,
 205                           double kill_time,
 206                           int argc, char **argv,
 207                           xbt_dict_t properties,
 208                           int auto_restart){
 209   return SIMIX_process_create(process, name, code, data, hostname,
 210                               kill_time, argc, argv, properties, auto_restart);
 211 }
 212 /**
 213  * \brief Internal function to create a process.
 214  *
 215  * This function actually creates the process.
 216  * It may be called when a SIMCALL_PROCESS_CREATE simcall occurs,
 217  * or directly for SIMIX internal purposes. The sure thing is that it's called from maestro context.
 218  *
 219  * \return the process created
 220  */
 221 void SIMIX_process_create(smx_process_t *process,
 222                           const char *name,
 223                           xbt_main_func_t code,
 224                           void *data,
 225                           const char *hostname,
 226                           double kill_time,
 227                           int argc, char **argv,
 228                           xbt_dict_t properties,
 229                           int auto_restart) {
 230
 231   *process = NULL;
 232   smx_host_t host = SIMIX_host_get_by_name(hostname);
 233
 234   XBT_DEBUG("Start process %s on host '%s'", name, hostname);
 235
 236   if (!SIMIX_host_get_state(host)) {
 237     XBT_WARN("Cannot launch process '%s' on failed host '%s'", name,
 238           hostname);
 239   }
 240   else {
 241     *process = xbt_new0(s_smx_process_t, 1);
 242
 243     xbt_assert(((code != NULL) && (host != NULL)), "Invalid parameters");
 244     /* Process data */
 245     (*process)->pid = simix_process_maxpid++;
 246     (*process)->name = xbt_strdup(name);
 247     (*process)->smx_host = host;
 248     (*process)->data = data;
 249     (*process)->comms = xbt_fifo_new();
 250     (*process)->simcall.issuer = *process;
 251     /* Process data for auto-restart */
 252     (*process)->auto_restart = auto_restart;
 253     (*process)->code = code;
 254     (*process)->argc = argc;
 255     (*process)->argv = argv;
 256     (*process)->kill_time = kill_time;
 257
 258
 259     XBT_VERB("Create context %s", (*process)->name);
 260     (*process)->context = SIMIX_context_new(code, argc, argv,
 261       simix_global->cleanup_process_function, *process);
 262
 263     (*process)->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 264     XBT_RUNNING_CTX_INITIALIZE((*process)->running_ctx);
 265
 266     /* Add properties */
 267     (*process)->properties = properties;
 268
 269     /* Add the process to it's host process list */
 270     xbt_swag_insert(*process, host->process_list);
 271
 272     XBT_DEBUG("Start context '%s'", (*process)->name);
 273
 274     /* Now insert it in the global process list and in the process to run list */
 275     xbt_swag_insert(*process, simix_global->process_list);
 276     XBT_DEBUG("Inserting %s(%s) in the to_run list", (*process)->name, host->name);
 277     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, *process);
 278   }
 279
 280   if (kill_time > SIMIX_get_clock()) {
 281     if (simix_global->kill_process_function) {
 282       XBT_DEBUG("Process %s(%s) will be kill at time %f", (*process)->name,
 283           (*process)->smx_host->name, kill_time);
 284       SIMIX_timer_set(kill_time, simix_global->kill_process_function, *process);
 285     }
 286   }
 287 }
 288
 289 /**
 290  * \brief Executes the processes from simix_global->process_to_run.
 291  *
 292  * The processes of simix_global->process_to_run are run (in parallel if
 293  * possible).  On exit, simix_global->process_to_run is empty, and
 294  * simix_global->process_that_ran contains the list of processes that just ran.
 295  * The two lists are swapped so, be careful when using them before and after a
 296  * call to this function.
 297  */
 298 void SIMIX_process_runall(void)
 299 {
 300   SIMIX_context_runall();
 301
 302   xbt_dynar_t tmp = simix_global->process_that_ran;
 303   simix_global->process_that_ran = simix_global->process_to_run;
 304   simix_global->process_to_run = tmp;
 305   xbt_dynar_reset(simix_global->process_to_run);
 306 }
 307
 308 void SIMIX_pre_process_kill(smx_simcall_t simcall, smx_process_t process) {
 309   SIMIX_process_kill(process, simcall->issuer);
 310 }
 311 /**
 312  * \brief Internal function to kill a SIMIX process.
 313  *
 314  * This function may be called when a SIMCALL_PROCESS_KILL simcall occurs,
 315  * or directly for SIMIX internal purposes.
 316  *
 317  * \param process poor victim
 318  * \param issuer the process which has sent the PROCESS_KILL. Important to not schedule twice the same process.
 319  */
 320 void SIMIX_process_kill(smx_process_t process, smx_process_t issuer) {
 321
 322   XBT_DEBUG("Killing process %s on %s", process->name, process->smx_host->name);
 323
 324   process->context->iwannadie = 1;
 325   process->blocked = 0;
 326   process->suspended = 0;
 327   /* FIXME: set doexception to 0 also? */
 328
 329   /* destroy the blocking action if any */
 330   if (process->waiting_action) {
 331
 332     switch (process->waiting_action->type) {
 333
 334       case SIMIX_ACTION_EXECUTE:
 335       case SIMIX_ACTION_PARALLEL_EXECUTE:
 336         SIMIX_host_execution_destroy(process->waiting_action);
 337         break;
 338
 339       case SIMIX_ACTION_COMMUNICATE:
 340         xbt_fifo_remove(process->comms, process->waiting_action);
 341         SIMIX_comm_cancel(process->waiting_action);
 342         break;
 343
 344         case SIMIX_ACTION_SLEEP:
 345           SIMIX_process_sleep_destroy(process->waiting_action);
 346           break;
 347
 348         case SIMIX_ACTION_SYNCHRO:
 349           SIMIX_synchro_stop_waiting(process, &process->simcall);
 350           SIMIX_synchro_destroy(process->waiting_action);
 351           break;
 352
 353         case SIMIX_ACTION_IO:
 354           SIMIX_io_destroy(process->waiting_action);
 355           break;
 356
 357         /* **************************************/
 358         /* TUTORIAL: New API                    */
 359         case SIMIX_ACTION_NEW_API:
 360           SIMIX_new_api_destroy(process->waiting_action);
 361           break;
 362         /* **************************************/
 363
 364     }
 365   }
 366   if(!xbt_dynar_member(simix_global->process_to_run, &(process)) && process != issuer) {
 367     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, process);
 368   }
 369
 370 }
 371
 372 void SIMIX_pre_process_killall(smx_simcall_t simcall) {
 373   SIMIX_process_killall(simcall->issuer);
 374 }
 375 /**
 376  * \brief Kills all running processes.
 377  * \param issuer this one will not be killed
 378  */
 379 void SIMIX_process_killall(smx_process_t issuer)
 380 {
 381   smx_process_t p = NULL;
 382
 383   while ((p = xbt_swag_extract(simix_global->process_list))) {
 384     if (p != issuer) {
 385       SIMIX_process_kill(p,issuer);
 386     }
 387   }
 388
 389   SIMIX_context_runall();
 390
 391   SIMIX_process_empty_trash();
 392 }
 393
 394 void SIMIX_pre_process_change_host(smx_simcall_t simcall, smx_process_t process,
 395                                    smx_host_t dest)
 396 {
 397   process->new_host = dest;
 398 }
 399 void SIMIX_process_change_host(smx_process_t process,
 400              smx_host_t dest)
 401 {
 402   xbt_assert((process != NULL), "Invalid parameters");
 403   xbt_swag_remove(process, process->smx_host->process_list);
 404   process->smx_host = dest;
 405   xbt_swag_insert(process, dest->process_list);
 406 }
 407
 408
 409 void SIMIX_pre_process_suspend(smx_simcall_t simcall, smx_process_t process)
 410 {
 411   smx_action_t action_suspend =
 412       SIMIX_process_suspend(process, simcall->issuer);
 413
 414   if (process != simcall->issuer) {
 415     SIMIX_simcall_answer(simcall);
 416   } else {
 417     xbt_fifo_push(action_suspend->simcalls, simcall);
 418     process->waiting_action = action_suspend;
 419     SIMIX_host_execution_suspend(process->waiting_action);
 420   }
 421   /* If we are suspending ourselves, then just do not finish the simcall now */
 422 }
 423
 424 smx_action_t SIMIX_process_suspend(smx_process_t process, smx_process_t issuer)
 425 {
 426   xbt_assert((process != NULL), "Invalid parameters");
 427
 428   if (process->suspended) {
 429     XBT_DEBUG("Process '%s' is already suspended", process->name);
 430     return NULL;
 431   }
 432
 433   process->suspended = 1;
 434
 435   /* If we are suspending another process, and it is waiting on an action,
 436      suspend its action. */
 437   if (process != issuer) {
 438
 439     if (process->waiting_action) {
 440
 441       switch (process->waiting_action->type) {
 442
 443         case SIMIX_ACTION_EXECUTE:
 444         case SIMIX_ACTION_PARALLEL_EXECUTE:
 445           SIMIX_host_execution_suspend(process->waiting_action);
 446           break;
 447
 448         case SIMIX_ACTION_COMMUNICATE:
 449           SIMIX_comm_suspend(process->waiting_action);
 450           break;
 451
 452         case SIMIX_ACTION_SLEEP:
 453           SIMIX_process_sleep_suspend(process->waiting_action);
 454           break;
 455
 456         case SIMIX_ACTION_SYNCHRO:
 457           /* Suspension is delayed to when the process is rescheduled. */
 458           break;
 459
 460         default:
 461           xbt_die("Internal error in SIMIX_process_suspend: unexpected action type %d",
 462               (int)process->waiting_action->type);
 463       }
 464       return NULL;
 465     } else {
 466       /* Suspension is delayed to when the process is rescheduled. */
 467       return NULL;
 468     }
 469   } else {
 470     return SIMIX_host_execute("suspend", process->smx_host, 0.0, 1.0);
 471   }
 472 }
 473
 474 void SIMIX_pre_process_resume(smx_simcall_t simcall, smx_process_t process){
 475   SIMIX_process_resume(process, simcall->issuer);
 476 }
 477
 478 void SIMIX_process_resume(smx_process_t process, smx_process_t issuer)
 479 {
 480   xbt_assert((process != NULL), "Invalid parameters");
 481
 482   XBT_IN("process = %p, issuer = %p", process, issuer);
 483
 484   if(process->context->iwannadie) {
 485     XBT_VERB("Ignoring request to suspend a process that is currently dying.");
 486     return;
 487   }
 488
 489   if(!process->suspended) return;
 490   process->suspended = 0;
 491
 492   /* If we are resuming another process, resume the action it was waiting for
 493      if any. Otherwise add it to the list of process to run in the next round. */
 494   if (process != issuer) {
 495
 496     if (process->waiting_action) {
 497
 498       switch (process->waiting_action->type) {
 499
 500         case SIMIX_ACTION_EXECUTE:
 501         case SIMIX_ACTION_PARALLEL_EXECUTE:
 502           SIMIX_host_execution_resume(process->waiting_action);
 503           break;
 504
 505         case SIMIX_ACTION_COMMUNICATE:
 506           SIMIX_comm_resume(process->waiting_action);
 507           break;
 508
 509         case SIMIX_ACTION_SLEEP:
 510           SIMIX_process_sleep_resume(process->waiting_action);
 511           break;
 512
 513         case SIMIX_ACTION_SYNCHRO:
 514           /* I cannot resume it now. This is delayed to when the process is rescheduled at
 515            * the end of the synchro. */
 516           break;
 517
 518         default:
 519           xbt_die("Internal error in SIMIX_process_resume: unexpected action type %d",
 520               (int)process->waiting_action->type);
 521       }
 522     }
 523   } else XBT_WARN("Strange. Process %p is trying to resume himself.", issuer);
 524
 525   XBT_OUT();
 526 }
 527
 528 int SIMIX_process_get_maxpid(void) {
 529   return simix_process_maxpid;
 530 }
 531
 532 int SIMIX_pre_process_count(smx_simcall_t simcall){
 533   return SIMIX_process_count();
 534 }
 535 int SIMIX_process_count(void)
 536 {
 537   return xbt_swag_size(simix_global->process_list);
 538 }
 539
 540 void* SIMIX_pre_process_self_get_data(smx_simcall_t simcall, smx_process_t self){
 541   return SIMIX_process_self_get_data(self);
 542 }
 543
 544 void* SIMIX_process_self_get_data(smx_process_t self)
 545 {
 546   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 547
 548   if (!self) {
 549     return NULL;
 550   }
 551   return SIMIX_process_get_data(self);
 552 }
 553
 554 void SIMIX_pre_process_set_data(smx_simcall_t simcall, smx_process_t process,
 555                                 void *data){
 556   SIMIX_process_set_data(process, data);
 557 }
 558 void SIMIX_process_self_set_data(smx_process_t self, void *data)
 559 {
 560   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 561
 562   SIMIX_process_set_data(self, data);
 563 }
 564
 565 void* SIMIX_pre_process_get_data(smx_simcall_t simcall, smx_process_t process){
 566   return SIMIX_process_get_data(process);
 567 }
 568 void* SIMIX_process_get_data(smx_process_t process)
 569 {
 570   return process->data;
 571 }
 572
 573 void SIMIX_process_set_data(smx_process_t process, void *data)
 574 {
 575   process->data = data;
 576 }
 577
 578 smx_host_t SIMIX_pre_process_get_host(smx_simcall_t simcall, smx_process_t process){
 579   return SIMIX_process_get_host(process);
 580 }
 581 smx_host_t SIMIX_process_get_host(smx_process_t process)
 582 {
 583   return process->smx_host;
 584 }
 585
 586 /* needs to be public and without simcall because it is called
 587    by exceptions and logging events */
 588 const char* SIMIX_process_self_get_name(void) {
 589
 590   smx_process_t process = SIMIX_process_self();
 591   if (process == NULL || process == simix_global->maestro_process)
 592     return "";
 593
 594   return SIMIX_process_get_name(process);
 595 }
 596
 597 const char* SIMIX_pre_process_get_name(smx_simcall_t simcall, smx_process_t process) {
 598   return SIMIX_process_get_name(process);
 599 }
 600 const char* SIMIX_process_get_name(smx_process_t process)
 601 {
 602   return process->name;
 603 }
 604
 605 smx_process_t SIMIX_process_get_by_name(const char* name)
 606 {
 607   smx_process_t proc;
 608
 609   xbt_swag_foreach(proc, simix_global->process_list)
 610   {
 611     if(!strcmp(name, proc->name))
 612       return proc;
 613   }
 614   return NULL;
 615 }
 616
 617 int SIMIX_pre_process_is_suspended(smx_simcall_t simcall, smx_process_t process){
 618   return SIMIX_process_is_suspended(process);
 619 }
 620 int SIMIX_process_is_suspended(smx_process_t process)
 621 {
 622   return process->suspended;
 623 }
 624
 625 xbt_dict_t SIMIX_pre_process_get_properties(smx_simcall_t simcall, smx_process_t process){
 626   return SIMIX_process_get_properties(process);
 627 }
 628 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
 629 {
 630   return process->properties;
 631 }
 632
 633 void SIMIX_pre_process_sleep(smx_simcall_t simcall, double duration)
 634 {
 635   if (MC_is_active()) {
 636     MC_process_clock_add(simcall->issuer, duration);
 637     simcall_process_sleep__set__result(simcall, SIMIX_DONE);
 638     SIMIX_simcall_answer(simcall);
 639     return;
 640   }
 641   smx_action_t action = SIMIX_process_sleep(simcall->issuer, duration);
 642   xbt_fifo_push(action->simcalls, simcall);
 643   simcall->issuer->waiting_action = action;
 644 }
 645
 646 smx_action_t SIMIX_process_sleep(smx_process_t process, double duration)
 647 {
 648   smx_action_t action;
 649   smx_host_t host = process->smx_host;
 650
 651   /* check if the host is active */
 652   if (surf_workstation_model->extension.
 653       workstation.get_state(host->host) != SURF_RESOURCE_ON) {
 654     THROWF(host_error, 0, "Host %s failed, you cannot call this function",
 655            host->name);
 656   }
 657
 658   action = xbt_mallocator_get(simix_global->action_mallocator);
 659   action->type = SIMIX_ACTION_SLEEP;
 660   action->name = NULL;
 661 #ifdef HAVE_TRACING
 662   action->category = NULL;
 663 #endif
 664
 665   action->sleep.host = host;
 666   action->sleep.surf_sleep =
 667       surf_workstation_model->extension.workstation.sleep(host->host, duration);
 668
 669   surf_workstation_model->action_data_set(action->sleep.surf_sleep, action);
 670   XBT_DEBUG("Create sleep action %p", action);
 671
 672   return action;
 673 }
 674
 675 void SIMIX_post_process_sleep(smx_action_t action)
 676 {
 677   smx_simcall_t simcall;
 678   e_smx_state_t state;
 679
 680   while ((simcall = xbt_fifo_shift(action->simcalls))) {
 681
 682     switch(surf_workstation_model->action_state_get(action->sleep.surf_sleep)){
 683       case SURF_ACTION_FAILED:
 684         simcall->issuer->context->iwannadie = 1;
 685         //SMX_EXCEPTION(simcall->issuer, host_error, 0, "Host failed");
 686         break;
 687
 688       case SURF_ACTION_DONE:
 689         state = SIMIX_DONE;
 690         break;
 691
 692       default:
 693         THROW_IMPOSSIBLE;
 694         break;
 695     }
 696     if (surf_workstation_model->extension.
 697         workstation.get_state(simcall->issuer->smx_host->host) != SURF_RESOURCE_ON) {
 698       simcall->issuer->context->iwannadie = 1;
 699     }
 700     simcall_process_sleep__set__result(simcall, state);
 701     simcall->issuer->waiting_action = NULL;
 702     SIMIX_simcall_answer(simcall);
 703
 704   }
 705   SIMIX_process_sleep_destroy(action);
 706 }
 707
 708 void SIMIX_process_sleep_destroy(smx_action_t action)
 709 {
 710   XBT_DEBUG("Destroy action %p", action);
 711   if (action->sleep.surf_sleep)
 712     action->sleep.surf_sleep->model_type->action_unref(action->sleep.surf_sleep);
 713   xbt_mallocator_release(simix_global->action_mallocator, action);
 714 }
 715
 716 void SIMIX_process_sleep_suspend(smx_action_t action)
 717 {
 718   surf_workstation_model->suspend(action->sleep.surf_sleep);
 719 }
 720
 721 void SIMIX_process_sleep_resume(smx_action_t action)
 722 {
 723   surf_workstation_model->resume(action->sleep.surf_sleep);
 724 }
 725
 726 /**
 727  * \brief Calling this function makes the process to yield.
 728  *
 729  * Only the current process can call this function, giving back the control to
 730  * maestro.
 731  *
 732  * \param self the current process
 733  */
 734 void SIMIX_process_yield(smx_process_t self)
 735 {
 736   XBT_DEBUG("Yield process '%s'", self->name);
 737
 738   /* Go into sleep and return control to maestro */
 739   SIMIX_context_suspend(self->context);
 740
 741   /* Ok, maestro returned control to us */
 742   XBT_DEBUG("Control returned to me: '%s'", self->name);
 743
 744   if (self->new_host) {
 745     SIMIX_process_change_host(self, self->new_host);
 746     self->new_host = NULL;
 747   }
 748
 749   if (self->context->iwannadie){
 750     XBT_DEBUG("I wanna die!");
 751     SIMIX_process_stop(self);
 752   }
 753
 754   if(self->suspended) {
 755     xbt_assert(!self->doexception, "Gloups! This exception may be lost by subsequent calls.");
 756     self->suspended = 0;
 757     SIMIX_process_suspend(self,self);
 758   }
 759
 760   if (self->doexception) {
 761     XBT_DEBUG("Wait, maestro left me an exception");
 762     self->doexception = 0;
 763     SMX_THROW();
 764   }
 765
 766 }
 767
 768 /* callback: context fetching */
 769 xbt_running_ctx_t *SIMIX_process_get_running_context(void)
 770 {
 771   return SIMIX_process_self()->running_ctx;
 772 }
 773
 774 /* callback: termination */
 775 void SIMIX_process_exception_terminate(xbt_ex_t * e)
 776 {
 777   xbt_ex_display(e);
 778   xbt_abort();
 779 }
 780
 781 smx_context_t SIMIX_process_get_context(smx_process_t p) {
 782   return p->context;
 783 }
 784
 785 void SIMIX_process_set_context(smx_process_t p,smx_context_t c) {
 786   p->context = c;
 787 }
 788
 789 /**
 790  * \brief Returns the list of processes to run.
 791  */
 792 xbt_dynar_t SIMIX_process_get_runnable(void)
 793 {
 794   return simix_global->process_to_run;
 795 }
 796
 797 /**
 798  * \brief Returns the process from PID.
 799  */
 800 smx_process_t SIMIX_process_from_PID(int PID)
 801 {
 802   smx_process_t proc;
 803   xbt_swag_foreach(proc, simix_global->process_list)
 804   {
 805    if(proc->pid == PID)
 806    return proc;
 807   }
 808   return NULL;
 809 }
 810
 811 /** @brief returns a dynar containg all currently existing processes */
 812 xbt_dynar_t SIMIX_processes_as_dynar(void) {
 813   smx_process_t proc;
 814   xbt_dynar_t res = xbt_dynar_new(sizeof(smx_process_t),NULL);
 815   xbt_swag_foreach(proc, simix_global->process_list) {
 816     xbt_dynar_push(res,&proc);
 817   }
 818   return res;
 819 }
 820
 821
 822 void SIMIX_process_on_exit_runall(smx_process_t process) {
 823   s_smx_process_exit_fun_t exit_fun;
 824
 825   while (!xbt_dynar_is_empty(process->on_exit)) {
 826     exit_fun = xbt_dynar_pop_as(process->on_exit,s_smx_process_exit_fun_t);
 827     (exit_fun.fun)(exit_fun.arg);
 828   }
 829 }
 830
 831 void SIMIX_pre_process_on_exit(smx_simcall_t simcall, smx_process_t process,
 832                                int_f_pvoid_t fun, void *data) {
 833   SIMIX_process_on_exit(process, fun, data);
 834 }
 835
 836 void SIMIX_process_on_exit(smx_process_t process, int_f_pvoid_t fun, void *data) {
 837   xbt_assert(process, "current process not found: are you in maestro context ?");
 838
 839   if (!process->on_exit) {
 840     process->on_exit = xbt_dynar_new(sizeof(s_smx_process_exit_fun_t), NULL);
 841   }
 842
 843   s_smx_process_exit_fun_t exit_fun = {fun, data};
 844
 845   xbt_dynar_push_as(process->on_exit,s_smx_process_exit_fun_t,exit_fun);
 846 }
 847
 848 void SIMIX_pre_process_auto_restart_set(smx_simcall_t simcall, smx_process_t process,
 849                                         int auto_restart) {
 850   SIMIX_process_auto_restart_set(process, auto_restart);
 851 }
 852 /**
 853  * \brief Sets the auto-restart status of the process.
 854  * If set to 1, the process will be automatically restarted when its host
 855  * comes back.
 856  */
 857 void SIMIX_process_auto_restart_set(smx_process_t process, int auto_restart) {
 858   process->auto_restart = auto_restart;
 859 }
 860
 861 smx_process_t SIMIX_pre_process_restart(smx_simcall_t simcall, smx_process_t process) {
 862   return SIMIX_process_restart(process, simcall->issuer);
 863 }
 864 /**
 865  * \brief Restart a process.
 866  * Restart a process, starting it again from the beginning.
 867  */
 868 smx_process_t SIMIX_process_restart(smx_process_t process, smx_process_t issuer) {
 869   XBT_DEBUG("Restarting process %s on %s", process->name, process->smx_host->name);
 870   //retrieve the arguments of the old process
 871   //FIXME: Factorise this with SIMIX_host_add_auto_restart_process ?
 872   s_smx_process_arg_t arg;
 873   arg.code = process->code;
 874   arg.hostname = process->smx_host->name;
 875   arg.kill_time = process->kill_time;
 876   arg.argc = process->argc;
 877   arg.data = process->data;
 878   int i;
 879   arg.argv = xbt_new(char*,process->argc + 1);
 880   for (i = 0; i < arg.argc; i++) {
 881     arg.argv[i] = xbt_strdup(process->argv[i]);
 882   }
 883   arg.argv[process->argc] = NULL;
 884   arg.properties = NULL;
 885   arg.auto_restart = process->auto_restart;
 886   //kill the old process
 887   SIMIX_process_kill(process,issuer);
 888   //start the new process
 889   smx_process_t new_process;
 890   if (simix_global->create_process_function) {
 891     simix_global->create_process_function(&new_process,
 892                                           arg.argv[0],
 893                                           arg.code,
 894                                           arg.data,
 895                                           arg.hostname,
 896                                           arg.kill_time,
 897                                           arg.argc,
 898                                           arg.argv,
 899                                           arg.properties,
 900                                           arg.auto_restart);
 901   }
 902   else {
 903     simcall_process_create(&new_process,
 904                                           arg.argv[0],
 905                                           arg.code,
 906                                           arg.data,
 907                                           arg.hostname,
 908                                           arg.kill_time,
 909                                           arg.argc,
 910                                           arg.argv,
 911                                           arg.properties,
 912                                           arg.auto_restart);
 913
 914   }
 915   return new_process;
 916 }