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
 252     if(MC_is_active())
 253       MC_ignore_heap(&((*process)->simcall.result), sizeof((*process)->simcall.result));
 254
 255     /* Process data for auto-restart */
 256     (*process)->auto_restart = auto_restart;
 257     (*process)->code = code;
 258     (*process)->argc = argc;
 259     (*process)->argv = argv;
 260     (*process)->kill_time = kill_time;
 261
 262
 263     XBT_VERB("Create context %s", (*process)->name);
 264     (*process)->context = SIMIX_context_new(code, argc, argv,
 265       simix_global->cleanup_process_function, *process);
 266
 267     (*process)->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 268     XBT_RUNNING_CTX_INITIALIZE((*process)->running_ctx);
 269
 270     /* Add properties */
 271     (*process)->properties = properties;
 272
 273     /* Add the process to it's host process list */
 274     xbt_swag_insert(*process, host->process_list);
 275
 276     XBT_DEBUG("Start context '%s'", (*process)->name);
 277
 278     /* Now insert it in the global process list and in the process to run list */
 279     xbt_swag_insert(*process, simix_global->process_list);
 280     XBT_DEBUG("Inserting %s(%s) in the to_run list", (*process)->name, host->name);
 281     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, *process);
 282   }
 283
 284   if (kill_time > SIMIX_get_clock()) {
 285     if (simix_global->kill_process_function) {
 286       XBT_DEBUG("Process %s(%s) will be kill at time %f", (*process)->name,
 287           (*process)->smx_host->name, kill_time);
 288       SIMIX_timer_set(kill_time, simix_global->kill_process_function, *process);
 289     }
 290   }
 291 }
 292
 293 /**
 294  * \brief Executes the processes from simix_global->process_to_run.
 295  *
 296  * The processes of simix_global->process_to_run are run (in parallel if
 297  * possible).  On exit, simix_global->process_to_run is empty, and
 298  * simix_global->process_that_ran contains the list of processes that just ran.
 299  * The two lists are swapped so, be careful when using them before and after a
 300  * call to this function.
 301  */
 302 void SIMIX_process_runall(void)
 303 {
 304   SIMIX_context_runall();
 305
 306   xbt_dynar_t tmp = simix_global->process_that_ran;
 307   simix_global->process_that_ran = simix_global->process_to_run;
 308   simix_global->process_to_run = tmp;
 309   xbt_dynar_reset(simix_global->process_to_run);
 310 }
 311
 312 void SIMIX_pre_process_kill(smx_simcall_t simcall, smx_process_t process) {
 313   SIMIX_process_kill(process, simcall->issuer);
 314 }
 315 /**
 316  * \brief Internal function to kill a SIMIX process.
 317  *
 318  * This function may be called when a SIMCALL_PROCESS_KILL simcall occurs,
 319  * or directly for SIMIX internal purposes.
 320  *
 321  * \param process poor victim
 322  * \param issuer the process which has sent the PROCESS_KILL. Important to not schedule twice the same process.
 323  */
 324 void SIMIX_process_kill(smx_process_t process, smx_process_t issuer) {
 325
 326   XBT_DEBUG("Killing process %s on %s", process->name, process->smx_host->name);
 327
 328   process->context->iwannadie = 1;
 329   process->blocked = 0;
 330   process->suspended = 0;
 331   /* FIXME: set doexception to 0 also? */
 332
 333   /* destroy the blocking action if any */
 334   if (process->waiting_action) {
 335
 336     switch (process->waiting_action->type) {
 337
 338       case SIMIX_ACTION_EXECUTE:
 339       case SIMIX_ACTION_PARALLEL_EXECUTE:
 340         SIMIX_host_execution_destroy(process->waiting_action);
 341         break;
 342
 343       case SIMIX_ACTION_COMMUNICATE:
 344         xbt_fifo_remove(process->comms, process->waiting_action);
 345         SIMIX_comm_cancel(process->waiting_action);
 346         break;
 347
 348         case SIMIX_ACTION_SLEEP:
 349           SIMIX_process_sleep_destroy(process->waiting_action);
 350           break;
 351
 352         case SIMIX_ACTION_SYNCHRO:
 353           SIMIX_synchro_stop_waiting(process, &process->simcall);
 354           SIMIX_synchro_destroy(process->waiting_action);
 355           break;
 356
 357         case SIMIX_ACTION_IO:
 358           SIMIX_io_destroy(process->waiting_action);
 359           break;
 360
 361         /* **************************************/
 362         /* TUTORIAL: New API                    */
 363         case SIMIX_ACTION_NEW_API:
 364           SIMIX_new_api_destroy(process->waiting_action);
 365           break;
 366         /* **************************************/
 367
 368     }
 369   }
 370   if(!xbt_dynar_member(simix_global->process_to_run, &(process)) && process != issuer) {
 371     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, process);
 372   }
 373
 374 }
 375
 376 void SIMIX_pre_process_killall(smx_simcall_t simcall) {
 377   SIMIX_process_killall(simcall->issuer);
 378 }
 379 /**
 380  * \brief Kills all running processes.
 381  * \param issuer this one will not be killed
 382  */
 383 void SIMIX_process_killall(smx_process_t issuer)
 384 {
 385   smx_process_t p = NULL;
 386
 387   while ((p = xbt_swag_extract(simix_global->process_list))) {
 388     if (p != issuer) {
 389       SIMIX_process_kill(p,issuer);
 390     }
 391   }
 392
 393   SIMIX_context_runall();
 394
 395   SIMIX_process_empty_trash();
 396 }
 397
 398 void SIMIX_pre_process_change_host(smx_simcall_t simcall, smx_process_t process,
 399                                    smx_host_t dest)
 400 {
 401   process->new_host = dest;
 402 }
 403 void SIMIX_process_change_host(smx_process_t process,
 404              smx_host_t dest)
 405 {
 406   xbt_assert((process != NULL), "Invalid parameters");
 407   xbt_swag_remove(process, process->smx_host->process_list);
 408   process->smx_host = dest;
 409   xbt_swag_insert(process, dest->process_list);
 410 }
 411
 412
 413 void SIMIX_pre_process_suspend(smx_simcall_t simcall, smx_process_t process)
 414 {
 415   smx_action_t action_suspend =
 416       SIMIX_process_suspend(process, simcall->issuer);
 417
 418   if (process != simcall->issuer) {
 419     SIMIX_simcall_answer(simcall);
 420   } else {
 421     xbt_fifo_push(action_suspend->simcalls, simcall);
 422     process->waiting_action = action_suspend;
 423     SIMIX_host_execution_suspend(process->waiting_action);
 424   }
 425   /* If we are suspending ourselves, then just do not finish the simcall now */
 426 }
 427
 428 smx_action_t SIMIX_process_suspend(smx_process_t process, smx_process_t issuer)
 429 {
 430   xbt_assert((process != NULL), "Invalid parameters");
 431
 432   if (process->suspended) {
 433     XBT_DEBUG("Process '%s' is already suspended", process->name);
 434     return NULL;
 435   }
 436
 437   process->suspended = 1;
 438
 439   /* If we are suspending another process, and it is waiting on an action,
 440      suspend its action. */
 441   if (process != issuer) {
 442
 443     if (process->waiting_action) {
 444
 445       switch (process->waiting_action->type) {
 446
 447         case SIMIX_ACTION_EXECUTE:
 448         case SIMIX_ACTION_PARALLEL_EXECUTE:
 449           SIMIX_host_execution_suspend(process->waiting_action);
 450           break;
 451
 452         case SIMIX_ACTION_COMMUNICATE:
 453           SIMIX_comm_suspend(process->waiting_action);
 454           break;
 455
 456         case SIMIX_ACTION_SLEEP:
 457           SIMIX_process_sleep_suspend(process->waiting_action);
 458           break;
 459
 460         case SIMIX_ACTION_SYNCHRO:
 461           /* Suspension is delayed to when the process is rescheduled. */
 462           break;
 463
 464         default:
 465           xbt_die("Internal error in SIMIX_process_suspend: unexpected action type %d",
 466               (int)process->waiting_action->type);
 467       }
 468       return NULL;
 469     } else {
 470       /* Suspension is delayed to when the process is rescheduled. */
 471       return NULL;
 472     }
 473   } else {
 474     return SIMIX_host_execute("suspend", process->smx_host, 0.0, 1.0);
 475   }
 476 }
 477
 478 void SIMIX_pre_process_resume(smx_simcall_t simcall, smx_process_t process){
 479   SIMIX_process_resume(process, simcall->issuer);
 480 }
 481
 482 void SIMIX_process_resume(smx_process_t process, smx_process_t issuer)
 483 {
 484   xbt_assert((process != NULL), "Invalid parameters");
 485
 486   XBT_IN("process = %p, issuer = %p", process, issuer);
 487
 488   if(process->context->iwannadie) {
 489     XBT_VERB("Ignoring request to suspend a process that is currently dying.");
 490     return;
 491   }
 492
 493   if(!process->suspended) return;
 494   process->suspended = 0;
 495
 496   /* If we are resuming another process, resume the action it was waiting for
 497      if any. Otherwise add it to the list of process to run in the next round. */
 498   if (process != issuer) {
 499
 500     if (process->waiting_action) {
 501
 502       switch (process->waiting_action->type) {
 503
 504         case SIMIX_ACTION_EXECUTE:
 505         case SIMIX_ACTION_PARALLEL_EXECUTE:
 506           SIMIX_host_execution_resume(process->waiting_action);
 507           break;
 508
 509         case SIMIX_ACTION_COMMUNICATE:
 510           SIMIX_comm_resume(process->waiting_action);
 511           break;
 512
 513         case SIMIX_ACTION_SLEEP:
 514           SIMIX_process_sleep_resume(process->waiting_action);
 515           break;
 516
 517         case SIMIX_ACTION_SYNCHRO:
 518           /* I cannot resume it now. This is delayed to when the process is rescheduled at
 519            * the end of the synchro. */
 520           break;
 521
 522         default:
 523           xbt_die("Internal error in SIMIX_process_resume: unexpected action type %d",
 524               (int)process->waiting_action->type);
 525       }
 526     }
 527   } else XBT_WARN("Strange. Process %p is trying to resume himself.", issuer);
 528
 529   XBT_OUT();
 530 }
 531
 532 int SIMIX_process_get_maxpid(void) {
 533   return simix_process_maxpid;
 534 }
 535
 536 int SIMIX_pre_process_count(smx_simcall_t simcall){
 537   return SIMIX_process_count();
 538 }
 539 int SIMIX_process_count(void)
 540 {
 541   return xbt_swag_size(simix_global->process_list);
 542 }
 543
 544 void* SIMIX_pre_process_self_get_data(smx_simcall_t simcall, smx_process_t self){
 545   return SIMIX_process_self_get_data(self);
 546 }
 547
 548 void* SIMIX_process_self_get_data(smx_process_t self)
 549 {
 550   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 551
 552   if (!self) {
 553     return NULL;
 554   }
 555   return SIMIX_process_get_data(self);
 556 }
 557
 558 void SIMIX_pre_process_set_data(smx_simcall_t simcall, smx_process_t process,
 559                                 void *data){
 560   SIMIX_process_set_data(process, data);
 561 }
 562 void SIMIX_process_self_set_data(smx_process_t self, void *data)
 563 {
 564   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 565
 566   SIMIX_process_set_data(self, data);
 567 }
 568
 569 void* SIMIX_pre_process_get_data(smx_simcall_t simcall, smx_process_t process){
 570   return SIMIX_process_get_data(process);
 571 }
 572 void* SIMIX_process_get_data(smx_process_t process)
 573 {
 574   return process->data;
 575 }
 576
 577 void SIMIX_process_set_data(smx_process_t process, void *data)
 578 {
 579   process->data = data;
 580 }
 581
 582 smx_host_t SIMIX_pre_process_get_host(smx_simcall_t simcall, smx_process_t process){
 583   return SIMIX_process_get_host(process);
 584 }
 585 smx_host_t SIMIX_process_get_host(smx_process_t process)
 586 {
 587   return process->smx_host;
 588 }
 589
 590 /* needs to be public and without simcall because it is called
 591    by exceptions and logging events */
 592 const char* SIMIX_process_self_get_name(void) {
 593
 594   smx_process_t process = SIMIX_process_self();
 595   if (process == NULL || process == simix_global->maestro_process)
 596     return "";
 597
 598   return SIMIX_process_get_name(process);
 599 }
 600
 601 const char* SIMIX_pre_process_get_name(smx_simcall_t simcall, smx_process_t process) {
 602   return SIMIX_process_get_name(process);
 603 }
 604 const char* SIMIX_process_get_name(smx_process_t process)
 605 {
 606   return process->name;
 607 }
 608
 609 smx_process_t SIMIX_process_get_by_name(const char* name)
 610 {
 611   smx_process_t proc;
 612
 613   xbt_swag_foreach(proc, simix_global->process_list)
 614   {
 615     if(!strcmp(name, proc->name))
 616       return proc;
 617   }
 618   return NULL;
 619 }
 620
 621 int SIMIX_pre_process_is_suspended(smx_simcall_t simcall, smx_process_t process){
 622   return SIMIX_process_is_suspended(process);
 623 }
 624 int SIMIX_process_is_suspended(smx_process_t process)
 625 {
 626   return process->suspended;
 627 }
 628
 629 xbt_dict_t SIMIX_pre_process_get_properties(smx_simcall_t simcall, smx_process_t process){
 630   return SIMIX_process_get_properties(process);
 631 }
 632 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
 633 {
 634   return process->properties;
 635 }
 636
 637 void SIMIX_pre_process_sleep(smx_simcall_t simcall, double duration)
 638 {
 639   if (MC_is_active()) {
 640     MC_process_clock_add(simcall->issuer, duration);
 641     simcall_process_sleep__set__result(simcall, SIMIX_DONE);
 642     SIMIX_simcall_answer(simcall);
 643     return;
 644   }
 645   smx_action_t action = SIMIX_process_sleep(simcall->issuer, duration);
 646   xbt_fifo_push(action->simcalls, simcall);
 647   simcall->issuer->waiting_action = action;
 648 }
 649
 650 smx_action_t SIMIX_process_sleep(smx_process_t process, double duration)
 651 {
 652   smx_action_t action;
 653   smx_host_t host = process->smx_host;
 654
 655   /* check if the host is active */
 656   if (surf_workstation_model->extension.
 657       workstation.get_state(host->host) != SURF_RESOURCE_ON) {
 658     THROWF(host_error, 0, "Host %s failed, you cannot call this function",
 659            host->name);
 660   }
 661
 662   action = xbt_mallocator_get(simix_global->action_mallocator);
 663   action->type = SIMIX_ACTION_SLEEP;
 664   action->name = NULL;
 665 #ifdef HAVE_TRACING
 666   action->category = NULL;
 667 #endif
 668
 669   action->sleep.host = host;
 670   action->sleep.surf_sleep =
 671       surf_workstation_model->extension.workstation.sleep(host->host, duration);
 672
 673   surf_workstation_model->action_data_set(action->sleep.surf_sleep, action);
 674   XBT_DEBUG("Create sleep action %p", action);
 675
 676   return action;
 677 }
 678
 679 void SIMIX_post_process_sleep(smx_action_t action)
 680 {
 681   smx_simcall_t simcall;
 682   e_smx_state_t state;
 683
 684   while ((simcall = xbt_fifo_shift(action->simcalls))) {
 685
 686     switch(surf_workstation_model->action_state_get(action->sleep.surf_sleep)){
 687       case SURF_ACTION_FAILED:
 688         simcall->issuer->context->iwannadie = 1;
 689         //SMX_EXCEPTION(simcall->issuer, host_error, 0, "Host failed");
 690         break;
 691
 692       case SURF_ACTION_DONE:
 693         state = SIMIX_DONE;
 694         break;
 695
 696       default:
 697         THROW_IMPOSSIBLE;
 698         break;
 699     }
 700     if (surf_workstation_model->extension.
 701         workstation.get_state(simcall->issuer->smx_host->host) != SURF_RESOURCE_ON) {
 702       simcall->issuer->context->iwannadie = 1;
 703     }
 704     simcall_process_sleep__set__result(simcall, state);
 705     simcall->issuer->waiting_action = NULL;
 706     SIMIX_simcall_answer(simcall);
 707
 708   }
 709   SIMIX_process_sleep_destroy(action);
 710 }
 711
 712 void SIMIX_process_sleep_destroy(smx_action_t action)
 713 {
 714   XBT_DEBUG("Destroy action %p", action);
 715   if (action->sleep.surf_sleep)
 716     action->sleep.surf_sleep->model_type->action_unref(action->sleep.surf_sleep);
 717   xbt_mallocator_release(simix_global->action_mallocator, action);
 718 }
 719
 720 void SIMIX_process_sleep_suspend(smx_action_t action)
 721 {
 722   surf_workstation_model->suspend(action->sleep.surf_sleep);
 723 }
 724
 725 void SIMIX_process_sleep_resume(smx_action_t action)
 726 {
 727   surf_workstation_model->resume(action->sleep.surf_sleep);
 728 }
 729
 730 /**
 731  * \brief Calling this function makes the process to yield.
 732  *
 733  * Only the current process can call this function, giving back the control to
 734  * maestro.
 735  *
 736  * \param self the current process
 737  */
 738 void SIMIX_process_yield(smx_process_t self)
 739 {
 740   XBT_DEBUG("Yield process '%s'", self->name);
 741
 742   /* Go into sleep and return control to maestro */
 743   SIMIX_context_suspend(self->context);
 744
 745   /* Ok, maestro returned control to us */
 746   XBT_DEBUG("Control returned to me: '%s'", self->name);
 747
 748   if (self->new_host) {
 749     SIMIX_process_change_host(self, self->new_host);
 750     self->new_host = NULL;
 751   }
 752
 753   if (self->context->iwannadie){
 754     XBT_DEBUG("I wanna die!");
 755     SIMIX_process_stop(self);
 756   }
 757
 758   if(self->suspended) {
 759     xbt_assert(!self->doexception, "Gloups! This exception may be lost by subsequent calls.");
 760     self->suspended = 0;
 761     SIMIX_process_suspend(self,self);
 762   }
 763
 764   if (self->doexception) {
 765     XBT_DEBUG("Wait, maestro left me an exception");
 766     self->doexception = 0;
 767     SMX_THROW();
 768   }
 769
 770 }
 771
 772 /* callback: context fetching */
 773 xbt_running_ctx_t *SIMIX_process_get_running_context(void)
 774 {
 775   return SIMIX_process_self()->running_ctx;
 776 }
 777
 778 /* callback: termination */
 779 void SIMIX_process_exception_terminate(xbt_ex_t * e)
 780 {
 781   xbt_ex_display(e);
 782   xbt_abort();
 783 }
 784
 785 smx_context_t SIMIX_process_get_context(smx_process_t p) {
 786   return p->context;
 787 }
 788
 789 void SIMIX_process_set_context(smx_process_t p,smx_context_t c) {
 790   p->context = c;
 791 }
 792
 793 /**
 794  * \brief Returns the list of processes to run.
 795  */
 796 xbt_dynar_t SIMIX_process_get_runnable(void)
 797 {
 798   return simix_global->process_to_run;
 799 }
 800
 801 /**
 802  * \brief Returns the process from PID.
 803  */
 804 smx_process_t SIMIX_process_from_PID(int PID)
 805 {
 806   smx_process_t proc;
 807   xbt_swag_foreach(proc, simix_global->process_list)
 808   {
 809    if(proc->pid == PID)
 810    return proc;
 811   }
 812   return NULL;
 813 }
 814
 815 /** @brief returns a dynar containg all currently existing processes */
 816 xbt_dynar_t SIMIX_processes_as_dynar(void) {
 817   smx_process_t proc;
 818   xbt_dynar_t res = xbt_dynar_new(sizeof(smx_process_t),NULL);
 819   xbt_swag_foreach(proc, simix_global->process_list) {
 820     xbt_dynar_push(res,&proc);
 821   }
 822   return res;
 823 }
 824
 825
 826 void SIMIX_process_on_exit_runall(smx_process_t process) {
 827   s_smx_process_exit_fun_t exit_fun;
 828
 829   while (!xbt_dynar_is_empty(process->on_exit)) {
 830     exit_fun = xbt_dynar_pop_as(process->on_exit,s_smx_process_exit_fun_t);
 831     (exit_fun.fun)(exit_fun.arg);
 832   }
 833 }
 834
 835 void SIMIX_pre_process_on_exit(smx_simcall_t simcall, smx_process_t process,
 836                                int_f_pvoid_t fun, void *data) {
 837   SIMIX_process_on_exit(process, fun, data);
 838 }
 839
 840 void SIMIX_process_on_exit(smx_process_t process, int_f_pvoid_t fun, void *data) {
 841   xbt_assert(process, "current process not found: are you in maestro context ?");
 842
 843   if (!process->on_exit) {
 844     process->on_exit = xbt_dynar_new(sizeof(s_smx_process_exit_fun_t), NULL);
 845   }
 846
 847   s_smx_process_exit_fun_t exit_fun = {fun, data};
 848
 849   xbt_dynar_push_as(process->on_exit,s_smx_process_exit_fun_t,exit_fun);
 850 }
 851
 852 void SIMIX_pre_process_auto_restart_set(smx_simcall_t simcall, smx_process_t process,
 853                                         int auto_restart) {
 854   SIMIX_process_auto_restart_set(process, auto_restart);
 855 }
 856 /**
 857  * \brief Sets the auto-restart status of the process.
 858  * If set to 1, the process will be automatically restarted when its host
 859  * comes back.
 860  */
 861 void SIMIX_process_auto_restart_set(smx_process_t process, int auto_restart) {
 862   process->auto_restart = auto_restart;
 863 }
 864
 865 smx_process_t SIMIX_pre_process_restart(smx_simcall_t simcall, smx_process_t process) {
 866   return SIMIX_process_restart(process, simcall->issuer);
 867 }
 868 /**
 869  * \brief Restart a process.
 870  * Restart a process, starting it again from the beginning.
 871  */
 872 smx_process_t SIMIX_process_restart(smx_process_t process, smx_process_t issuer) {
 873   XBT_DEBUG("Restarting process %s on %s", process->name, process->smx_host->name);
 874   //retrieve the arguments of the old process
 875   //FIXME: Factorise this with SIMIX_host_add_auto_restart_process ?
 876   s_smx_process_arg_t arg;
 877   arg.code = process->code;
 878   arg.hostname = process->smx_host->name;
 879   arg.kill_time = process->kill_time;
 880   arg.argc = process->argc;
 881   arg.data = process->data;
 882   int i;
 883   arg.argv = xbt_new(char*,process->argc + 1);
 884   for (i = 0; i < arg.argc; i++) {
 885     arg.argv[i] = xbt_strdup(process->argv[i]);
 886   }
 887   arg.argv[process->argc] = NULL;
 888   arg.properties = NULL;
 889   arg.auto_restart = process->auto_restart;
 890   //kill the old process
 891   SIMIX_process_kill(process,issuer);
 892   //start the new process
 893   smx_process_t new_process;
 894   if (simix_global->create_process_function) {
 895     simix_global->create_process_function(&new_process,
 896                                           arg.argv[0],
 897                                           arg.code,
 898                                           arg.data,
 899                                           arg.hostname,
 900                                           arg.kill_time,
 901                                           arg.argc,
 902                                           arg.argv,
 903                                           arg.properties,
 904                                           arg.auto_restart);
 905   }
 906   else {
 907     simcall_process_create(&new_process,
 908                                           arg.argv[0],
 909                                           arg.code,
 910                                           arg.data,
 911                                           arg.hostname,
 912                                           arg.kill_time,
 913                                           arg.argc,
 914                                           arg.argv,
 915                                           arg.properties,
 916                                           arg.auto_restart);
 917
 918   }
 919   return new_process;
 920 }