src/simix/smx_process.c

   1 /* Copyright (c) 2007, 2008, 2009, 2010. 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  * Stops the process, execute all the registered on_exit functions
 150  * and stops its context.
 151  */
 152 void SIMIX_process_stop(smx_process_t arg) {
 153   /* execute the on_exit functions */
 154   SIMIX_process_on_exit_runall(arg);
 155   /* Add the process to the list of process to restart, only if
 156    * the host is down
 157    */
 158   if (arg->auto_restart && !SIMIX_host_get_state(arg->smx_host)) {
 159     SIMIX_host_add_auto_restart_process(arg->smx_host,arg->name,arg->code, arg->data,
 160                                         arg->smx_host->name,
 161                                         arg->kill_time,
 162                                         arg->argc,arg->argv,arg->properties,
 163                                         arg->auto_restart);
 164   }
 165   /* stop the context */
 166   SIMIX_context_stop(arg->context);
 167 }
 168
 169 /**
 170  * \brief Same as SIMIX_process_create() but with only one argument (used by timers).
 171  * This function frees the argument.
 172  * \return the process created
 173  */
 174 smx_process_t SIMIX_process_create_from_wrapper(smx_process_arg_t args) {
 175
 176   smx_process_t process;
 177   simix_global->create_process_function(
 178       &process,
 179       args->name,
 180       args->code,
 181       args->data,
 182       args->hostname,
 183       args->kill_time,
 184       args->argc,
 185       args->argv,
 186       args->properties,
 187       args->auto_restart);
 188   xbt_free(args);
 189   return process;
 190 }
 191
 192 /**
 193  * \brief Internal function to create a process.
 194  *
 195  * This function actually creates the process.
 196  * It may be called when a SIMCALL_PROCESS_CREATE simcall occurs,
 197  * or directly for SIMIX internal purposes. The sure thing is that it's called from maestro context.
 198  *
 199  * \return the process created
 200  */
 201 void SIMIX_process_create(smx_process_t *process,
 202                           const char *name,
 203                           xbt_main_func_t code,
 204                           void *data,
 205                           const char *hostname,
 206                           double kill_time,
 207                           int argc, char **argv,
 208                           xbt_dict_t properties,
 209                           int auto_restart) {
 210
 211   *process = NULL;
 212   smx_host_t host = SIMIX_host_get_by_name(hostname);
 213
 214   XBT_DEBUG("Start process %s on host %s", name, hostname);
 215
 216   if (!SIMIX_host_get_state(host)) {
 217     XBT_WARN("Cannot launch process '%s' on failed host '%s'", name,
 218           hostname);
 219   }
 220   else {
 221     *process = xbt_new0(s_smx_process_t, 1);
 222
 223     xbt_assert(((code != NULL) && (host != NULL)), "Invalid parameters");
 224
 225     /* Process data */
 226     (*process)->pid = simix_process_maxpid++;
 227     (*process)->name = xbt_strdup(name);
 228     (*process)->smx_host = host;
 229     (*process)->data = data;
 230     (*process)->comms = xbt_fifo_new();
 231     (*process)->simcall.issuer = *process;
 232     /* Process data for auto-restart */
 233     (*process)->auto_restart = auto_restart;
 234     (*process)->code = code;
 235     (*process)->argc = argc;
 236     (*process)->argv = argv;
 237     (*process)->kill_time = kill_time;
 238
 239
 240     XBT_VERB("Create context %s", (*process)->name);
 241     (*process)->context = SIMIX_context_new(code, argc, argv,
 242       simix_global->cleanup_process_function, *process);
 243
 244     (*process)->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 245     XBT_RUNNING_CTX_INITIALIZE((*process)->running_ctx);
 246
 247     /* Add properties */
 248     (*process)->properties = properties;
 249
 250     /* Add the process to it's host process list */
 251     xbt_swag_insert(*process, host->process_list);
 252
 253     XBT_DEBUG("Start context '%s'", (*process)->name);
 254
 255     /* Now insert it in the global process list and in the process to run list */
 256     xbt_swag_insert(*process, simix_global->process_list);
 257     XBT_DEBUG("Inserting %s(%s) in the to_run list", (*process)->name, host->name);
 258     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, *process);
 259   }
 260
 261   if (kill_time > SIMIX_get_clock()) {
 262     if (simix_global->kill_process_function) {
 263       XBT_DEBUG("Process %s(%s) will be kill at time %f", (*process)->name,
 264           (*process)->smx_host->name, kill_time);
 265       SIMIX_timer_set(kill_time, simix_global->kill_process_function, *process);
 266     }
 267   }
 268 }
 269
 270 /**
 271  * \brief Executes the processes from simix_global->process_to_run.
 272  *
 273  * The processes of simix_global->process_to_run are run (in parallel if
 274  * possible).  On exit, simix_global->process_to_run is empty, and
 275  * simix_global->process_that_ran contains the list of processes that just ran.
 276  * The two lists are swapped so, be careful when using them before and after a
 277  * call to this function.
 278  */
 279 void SIMIX_process_runall(void)
 280 {
 281   SIMIX_context_runall();
 282
 283   xbt_dynar_t tmp = simix_global->process_that_ran;
 284   simix_global->process_that_ran = simix_global->process_to_run;
 285   simix_global->process_to_run = tmp;
 286   xbt_dynar_reset(simix_global->process_to_run);
 287 }
 288
 289 /**
 290  * \brief Internal function to kill a SIMIX process.
 291  *
 292  * This function may be called when a SIMCALL_PROCESS_KILL simcall occurs,
 293  * or directly for SIMIX internal purposes.
 294  *
 295  * \param process poor victim
 296  */
 297 void SIMIX_process_kill(smx_process_t process) {
 298
 299   XBT_DEBUG("Killing process %s on %s", process->name, process->smx_host->name);
 300
 301   process->context->iwannadie = 1;
 302   process->blocked = 0;
 303   process->suspended = 0;
 304   /* FIXME: set doexception to 0 also? */
 305
 306   /* destroy the blocking action if any */
 307   if (process->waiting_action) {
 308
 309     switch (process->waiting_action->type) {
 310
 311       case SIMIX_ACTION_EXECUTE:
 312       case SIMIX_ACTION_PARALLEL_EXECUTE:
 313         SIMIX_host_execution_destroy(process->waiting_action);
 314         break;
 315
 316       case SIMIX_ACTION_COMMUNICATE:
 317         xbt_fifo_remove(process->comms, process->waiting_action);
 318         SIMIX_comm_destroy(process->waiting_action);
 319         break;
 320
 321         case SIMIX_ACTION_SLEEP:
 322           SIMIX_process_sleep_destroy(process->waiting_action);
 323           break;
 324
 325         case SIMIX_ACTION_SYNCHRO:
 326           SIMIX_synchro_stop_waiting(process, &process->simcall);
 327           SIMIX_synchro_destroy(process->waiting_action);
 328           break;
 329
 330         case SIMIX_ACTION_IO:
 331           SIMIX_io_destroy(process->waiting_action);
 332           break;
 333     }
 334   }
 335   if(!xbt_dynar_member(simix_global->process_to_run, &(process)))
 336     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, process);
 337 }
 338
 339 /**
 340  * \brief Kills all running processes.
 341  * \param issuer this one will not be killed
 342  */
 343 void SIMIX_process_killall(smx_process_t issuer)
 344 {
 345   smx_process_t p = NULL;
 346
 347   while ((p = xbt_swag_extract(simix_global->process_list))) {
 348     if (p != issuer) {
 349       SIMIX_process_kill(p);
 350     }
 351   }
 352
 353   SIMIX_context_runall();
 354
 355   SIMIX_process_empty_trash();
 356 }
 357
 358 void SIMIX_process_change_host(smx_process_t process,
 359              smx_host_t dest)
 360 {
 361   xbt_assert((process != NULL), "Invalid parameters");
 362   xbt_swag_remove(process, process->smx_host->process_list);
 363   process->smx_host = dest;
 364   xbt_swag_insert(process, dest->process_list);
 365 }
 366
 367 void SIMIX_pre_process_change_host(smx_process_t process, smx_host_t dest)
 368 {
 369   process->new_host = dest;
 370 }
 371
 372 void SIMIX_pre_process_suspend(smx_simcall_t simcall)
 373 {
 374   smx_process_t process = simcall->process_suspend.process;
 375   smx_action_t action_suspend =
 376       SIMIX_process_suspend(process, simcall->issuer);
 377
 378   if (process != simcall->issuer) {
 379     SIMIX_simcall_answer(simcall);
 380   } else {
 381     xbt_fifo_push(action_suspend->simcalls, simcall);
 382     process->waiting_action = action_suspend;
 383     SIMIX_host_execution_suspend(process->waiting_action);
 384   }
 385   /* If we are suspending ourselves, then just do not finish the simcall now */
 386 }
 387
 388 smx_action_t SIMIX_process_suspend(smx_process_t process, smx_process_t issuer)
 389 {
 390   xbt_assert((process != NULL), "Invalid parameters");
 391
 392   if (process->suspended) {
 393     XBT_DEBUG("Process '%s' is already suspended", process->name);
 394     return NULL;
 395   }
 396
 397   process->suspended = 1;
 398
 399   /* If we are suspending another process, and it is waiting on an action,
 400      suspend its action. */
 401   if (process != issuer) {
 402
 403     if (process->waiting_action) {
 404
 405       switch (process->waiting_action->type) {
 406
 407         case SIMIX_ACTION_EXECUTE:
 408         case SIMIX_ACTION_PARALLEL_EXECUTE:
 409           SIMIX_host_execution_suspend(process->waiting_action);
 410           break;
 411
 412         case SIMIX_ACTION_COMMUNICATE:
 413           SIMIX_comm_suspend(process->waiting_action);
 414           break;
 415
 416         case SIMIX_ACTION_SLEEP:
 417           SIMIX_process_sleep_suspend(process->waiting_action);
 418           break;
 419
 420         case SIMIX_ACTION_SYNCHRO:
 421           /* Suspension is delayed to when the process is rescheduled. */
 422           break;
 423
 424         default:
 425           xbt_die("Internal error in SIMIX_process_suspend: unexpected action type %d",
 426               (int)process->waiting_action->type);
 427       }
 428       return NULL;
 429     } else {
 430       /* Suspension is delayed to when the process is rescheduled. */
 431       return NULL;
 432     }
 433   } else {
 434     return SIMIX_host_execute("suspend", process->smx_host, 0.0, 1.0);
 435   }
 436 }
 437
 438 void SIMIX_process_resume(smx_process_t process, smx_process_t issuer)
 439 {
 440   xbt_assert((process != NULL), "Invalid parameters");
 441
 442   XBT_IN("process = %p, issuer = %p", process, issuer);
 443
 444   if(process->context->iwannadie) {
 445     XBT_VERB("Ignoring request to suspend a process that is currently dying.");
 446     return;
 447   }
 448
 449   if(!process->suspended) return;
 450   process->suspended = 0;
 451
 452   /* If we are resuming another process, resume the action it was waiting for
 453      if any. Otherwise add it to the list of process to run in the next round. */
 454   if (process != issuer) {
 455
 456     if (process->waiting_action) {
 457
 458       switch (process->waiting_action->type) {
 459
 460         case SIMIX_ACTION_EXECUTE:
 461         case SIMIX_ACTION_PARALLEL_EXECUTE:
 462           SIMIX_host_execution_resume(process->waiting_action);
 463           break;
 464
 465         case SIMIX_ACTION_COMMUNICATE:
 466           SIMIX_comm_resume(process->waiting_action);
 467           break;
 468
 469         case SIMIX_ACTION_SLEEP:
 470           SIMIX_process_sleep_resume(process->waiting_action);
 471           break;
 472
 473         case SIMIX_ACTION_SYNCHRO:
 474           /* I cannot resume it now. This is delayed to when the process is rescheduled at
 475            * the end of the synchro. */
 476           break;
 477
 478         default:
 479           xbt_die("Internal error in SIMIX_process_resume: unexpected action type %d",
 480               (int)process->waiting_action->type);
 481       }
 482     }
 483   } else XBT_WARN("Strange. Process %p is trying to resume himself.", issuer);
 484
 485   XBT_OUT();
 486 }
 487
 488 int SIMIX_process_get_maxpid(void) {
 489   return simix_process_maxpid;
 490 }
 491
 492 int SIMIX_process_count(void)
 493 {
 494   return xbt_swag_size(simix_global->process_list);
 495 }
 496
 497 void* SIMIX_process_self_get_data(smx_process_t self)
 498 {
 499   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 500
 501   if (!self) {
 502     return NULL;
 503   }
 504   return SIMIX_process_get_data(self);
 505 }
 506
 507 void SIMIX_process_self_set_data(smx_process_t self, void *data)
 508 {
 509   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 510
 511   SIMIX_process_set_data(self, data);
 512 }
 513
 514 void* SIMIX_process_get_data(smx_process_t process)
 515 {
 516   return process->data;
 517 }
 518
 519 void SIMIX_process_set_data(smx_process_t process, void *data)
 520 {
 521   process->data = data;
 522 }
 523
 524 smx_host_t SIMIX_process_get_host(smx_process_t process)
 525 {
 526   return process->smx_host;
 527 }
 528
 529 /* needs to be public and without simcall because it is called
 530    by exceptions and logging events */
 531 const char* SIMIX_process_self_get_name(void) {
 532
 533   smx_process_t process = SIMIX_process_self();
 534   if (process == NULL || process == simix_global->maestro_process)
 535     return "";
 536
 537   return SIMIX_process_get_name(process);
 538 }
 539
 540 const char* SIMIX_process_get_name(smx_process_t process)
 541 {
 542   return process->name;
 543 }
 544
 545 smx_process_t SIMIX_process_get_by_name(const char* name)
 546 {
 547   smx_process_t proc;
 548
 549   xbt_swag_foreach(proc, simix_global->process_list)
 550   {
 551     if(!strcmp(name, proc->name))
 552       return proc;
 553   }
 554   return NULL;
 555 }
 556
 557 int SIMIX_process_is_suspended(smx_process_t process)
 558 {
 559   return process->suspended;
 560 }
 561
 562 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
 563 {
 564   return process->properties;
 565 }
 566
 567 void SIMIX_pre_process_sleep(smx_simcall_t simcall)
 568 {
 569   if (MC_IS_ENABLED) {
 570     MC_process_clock_add(simcall->issuer, simcall->process_sleep.duration);
 571     simcall->process_sleep.result = SIMIX_DONE;
 572     SIMIX_simcall_answer(simcall);
 573     return;
 574   }
 575   smx_action_t action = SIMIX_process_sleep(simcall->issuer, simcall->process_sleep.duration);
 576   xbt_fifo_push(action->simcalls, simcall);
 577   simcall->issuer->waiting_action = action;
 578 }
 579
 580 smx_action_t SIMIX_process_sleep(smx_process_t process, double duration)
 581 {
 582   smx_action_t action;
 583   smx_host_t host = process->smx_host;
 584
 585   /* check if the host is active */
 586   if (surf_workstation_model->extension.
 587       workstation.get_state(host->host) != SURF_RESOURCE_ON) {
 588     THROWF(host_error, 0, "Host %s failed, you cannot call this function",
 589            host->name);
 590   }
 591
 592   action = xbt_mallocator_get(simix_global->action_mallocator);
 593   action->type = SIMIX_ACTION_SLEEP;
 594   action->name = NULL;
 595 #ifdef HAVE_TRACING
 596   action->category = NULL;
 597 #endif
 598
 599   action->sleep.host = host;
 600   action->sleep.surf_sleep =
 601       surf_workstation_model->extension.workstation.sleep(host->host, duration);
 602
 603   surf_workstation_model->action_data_set(action->sleep.surf_sleep, action);
 604   XBT_DEBUG("Create sleep action %p", action);
 605
 606   return action;
 607 }
 608
 609 void SIMIX_post_process_sleep(smx_action_t action)
 610 {
 611   smx_simcall_t simcall;
 612   e_smx_state_t state;
 613
 614   while ((simcall = xbt_fifo_shift(action->simcalls))) {
 615
 616     switch(surf_workstation_model->action_state_get(action->sleep.surf_sleep)){
 617       case SURF_ACTION_FAILED:
 618         simcall->issuer->context->iwannadie = 1;
 619         //SMX_EXCEPTION(simcall->issuer, host_error, 0, "Host failed");
 620         break;
 621
 622       case SURF_ACTION_DONE:
 623         state = SIMIX_DONE;
 624         break;
 625
 626       default:
 627         THROW_IMPOSSIBLE;
 628         break;
 629     }
 630     if (surf_workstation_model->extension.
 631         workstation.get_state(simcall->issuer->smx_host->host) != SURF_RESOURCE_ON) {
 632       simcall->issuer->context->iwannadie = 1;
 633     }
 634     simcall->process_sleep.result = state;
 635     simcall->issuer->waiting_action = NULL;
 636     SIMIX_simcall_answer(simcall);
 637
 638   }
 639   SIMIX_process_sleep_destroy(action);
 640 }
 641
 642 void SIMIX_process_sleep_destroy(smx_action_t action)
 643 {
 644   XBT_DEBUG("Destroy action %p", action);
 645   if (action->sleep.surf_sleep)
 646     action->sleep.surf_sleep->model_type->action_unref(action->sleep.surf_sleep);
 647   xbt_mallocator_release(simix_global->action_mallocator, action);
 648 }
 649
 650 void SIMIX_process_sleep_suspend(smx_action_t action)
 651 {
 652   surf_workstation_model->suspend(action->sleep.surf_sleep);
 653 }
 654
 655 void SIMIX_process_sleep_resume(smx_action_t action)
 656 {
 657   surf_workstation_model->resume(action->sleep.surf_sleep);
 658 }
 659
 660 /**
 661  * \brief Calling this function makes the process to yield.
 662  *
 663  * Only the current process can call this function, giving back the control to
 664  * maestro.
 665  *
 666  * \param self the current process
 667  */
 668 void SIMIX_process_yield(smx_process_t self)
 669 {
 670   XBT_DEBUG("Yield process '%s'", self->name);
 671
 672   /* Go into sleep and return control to maestro */
 673   SIMIX_context_suspend(self->context);
 674
 675   /* Ok, maestro returned control to us */
 676   XBT_DEBUG("Control returned to me: '%s'", self->name);
 677
 678   if (self->new_host) {
 679     SIMIX_process_change_host(self, self->new_host);
 680     self->new_host = NULL;
 681   }
 682
 683   if (self->context->iwannadie){
 684     XBT_DEBUG("I wanna die!");
 685     SIMIX_process_stop(self);
 686   }
 687
 688   if(self->suspended) {
 689     xbt_assert(!self->doexception, "Gloups! This exception may be lost by subsequent calls.");
 690     self->suspended = 0;
 691     SIMIX_process_suspend(self,self);
 692   }
 693
 694   if (self->doexception) {
 695     XBT_DEBUG("Wait, maestro left me an exception");
 696     self->doexception = 0;
 697     SMX_THROW();
 698   }
 699 }
 700
 701 /* callback: context fetching */
 702 xbt_running_ctx_t *SIMIX_process_get_running_context(void)
 703 {
 704   return SIMIX_process_self()->running_ctx;
 705 }
 706
 707 /* callback: termination */
 708 void SIMIX_process_exception_terminate(xbt_ex_t * e)
 709 {
 710   xbt_ex_display(e);
 711   abort();
 712 }
 713
 714 smx_context_t SIMIX_process_get_context(smx_process_t p) {
 715   return p->context;
 716 }
 717
 718 void SIMIX_process_set_context(smx_process_t p,smx_context_t c) {
 719   p->context = c;
 720 }
 721
 722 /**
 723  * \brief Returns the list of processes to run.
 724  */
 725 xbt_dynar_t SIMIX_process_get_runnable(void)
 726 {
 727   return simix_global->process_to_run;
 728 }
 729
 730 /**
 731  * \brief Returns the process from PID.
 732  */
 733 smx_process_t SIMIX_process_from_PID(int PID)
 734 {
 735   smx_process_t proc;
 736   xbt_swag_foreach(proc, simix_global->process_list)
 737   {
 738    if(proc->pid == PID)
 739    return proc;
 740   }
 741   return NULL;
 742 }
 743
 744 /** @brief returns a dynar containg all currently existing processes */
 745 xbt_dynar_t SIMIX_processes_as_dynar(void) {
 746   smx_process_t proc;
 747   xbt_dynar_t res = xbt_dynar_new(sizeof(smx_process_t),NULL);
 748   xbt_swag_foreach(proc, simix_global->process_list) {
 749     xbt_dynar_push(res,&proc);
 750   }
 751   return res;
 752 }
 753 void SIMIX_process_on_exit_runall(smx_process_t process) {
 754   s_smx_process_exit_fun_t exit_fun;
 755
 756   while (!xbt_dynar_is_empty(process->on_exit)) {
 757     exit_fun = xbt_dynar_pop_as(process->on_exit,s_smx_process_exit_fun_t);
 758     (exit_fun.fun)(exit_fun.arg);
 759   }
 760 }
 761 void SIMIX_process_on_exit(smx_process_t process, int_f_pvoid_t fun, void *data) {
 762   xbt_assert(process, "current process not found: are you in maestro context ?");
 763
 764   if (!process->on_exit) {
 765     process->on_exit = xbt_dynar_new(sizeof(s_smx_process_exit_fun_t), NULL);
 766   }
 767
 768   s_smx_process_exit_fun_t exit_fun = {fun, data};
 769
 770   xbt_dynar_push_as(process->on_exit,s_smx_process_exit_fun_t,exit_fun);
 771 }
 772 /**
 773  * \brief Sets the auto-restart status of the process.
 774  * If set to 1, the process will be automatically restarted when its host
 775  * comes back.
 776  */
 777 void SIMIX_process_auto_restart_set(smx_process_t process, int auto_restart) {
 778   process->auto_restart = auto_restart;
 779 }