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