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_cancel(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         /* TUTORIAL: New API                    */
 339         case SIMIX_ACTION_NEW_API:
 340           SIMIX_new_api_destroy(process->waiting_action);
 341           break;
 342         /* **************************************/
 343
 344     }
 345   }
 346   if(!xbt_dynar_member(simix_global->process_to_run, &(process)) && process != issuer) {
 347     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, process);
 348   }
 349
 350 }
 351
 352 /**
 353  * \brief Kills all running processes.
 354  * \param issuer this one will not be killed
 355  */
 356 void SIMIX_process_killall(smx_process_t issuer)
 357 {
 358   smx_process_t p = NULL;
 359
 360   while ((p = xbt_swag_extract(simix_global->process_list))) {
 361     if (p != issuer) {
 362       SIMIX_process_kill(p,issuer);
 363     }
 364   }
 365
 366   SIMIX_context_runall();
 367
 368   SIMIX_process_empty_trash();
 369 }
 370
 371 void SIMIX_process_change_host(smx_process_t process,
 372              smx_host_t dest)
 373 {
 374   xbt_assert((process != NULL), "Invalid parameters");
 375   xbt_swag_remove(process, process->smx_host->process_list);
 376   process->smx_host = dest;
 377   xbt_swag_insert(process, dest->process_list);
 378 }
 379
 380 void SIMIX_pre_process_change_host(smx_process_t process, smx_host_t dest)
 381 {
 382   process->new_host = dest;
 383 }
 384
 385 void SIMIX_pre_process_suspend(smx_simcall_t simcall)
 386 {
 387   smx_process_t process = simcall->process_suspend.process;
 388   smx_action_t action_suspend =
 389       SIMIX_process_suspend(process, simcall->issuer);
 390
 391   if (process != simcall->issuer) {
 392     SIMIX_simcall_answer(simcall);
 393   } else {
 394     xbt_fifo_push(action_suspend->simcalls, simcall);
 395     process->waiting_action = action_suspend;
 396     SIMIX_host_execution_suspend(process->waiting_action);
 397   }
 398   /* If we are suspending ourselves, then just do not finish the simcall now */
 399 }
 400
 401 smx_action_t SIMIX_process_suspend(smx_process_t process, smx_process_t issuer)
 402 {
 403   xbt_assert((process != NULL), "Invalid parameters");
 404
 405   if (process->suspended) {
 406     XBT_DEBUG("Process '%s' is already suspended", process->name);
 407     return NULL;
 408   }
 409
 410   process->suspended = 1;
 411
 412   /* If we are suspending another process, and it is waiting on an action,
 413      suspend its action. */
 414   if (process != issuer) {
 415
 416     if (process->waiting_action) {
 417
 418       switch (process->waiting_action->type) {
 419
 420         case SIMIX_ACTION_EXECUTE:
 421         case SIMIX_ACTION_PARALLEL_EXECUTE:
 422           SIMIX_host_execution_suspend(process->waiting_action);
 423           break;
 424
 425         case SIMIX_ACTION_COMMUNICATE:
 426           SIMIX_comm_suspend(process->waiting_action);
 427           break;
 428
 429         case SIMIX_ACTION_SLEEP:
 430           SIMIX_process_sleep_suspend(process->waiting_action);
 431           break;
 432
 433         case SIMIX_ACTION_SYNCHRO:
 434           /* Suspension is delayed to when the process is rescheduled. */
 435           break;
 436
 437         default:
 438           xbt_die("Internal error in SIMIX_process_suspend: unexpected action type %d",
 439               (int)process->waiting_action->type);
 440       }
 441       return NULL;
 442     } else {
 443       /* Suspension is delayed to when the process is rescheduled. */
 444       return NULL;
 445     }
 446   } else {
 447     return SIMIX_host_execute("suspend", process->smx_host, 0.0, 1.0);
 448   }
 449 }
 450
 451 void SIMIX_process_resume(smx_process_t process, smx_process_t issuer)
 452 {
 453   xbt_assert((process != NULL), "Invalid parameters");
 454
 455   XBT_IN("process = %p, issuer = %p", process, issuer);
 456
 457   if(process->context->iwannadie) {
 458     XBT_VERB("Ignoring request to suspend a process that is currently dying.");
 459     return;
 460   }
 461
 462   if(!process->suspended) return;
 463   process->suspended = 0;
 464
 465   /* If we are resuming another process, resume the action it was waiting for
 466      if any. Otherwise add it to the list of process to run in the next round. */
 467   if (process != issuer) {
 468
 469     if (process->waiting_action) {
 470
 471       switch (process->waiting_action->type) {
 472
 473         case SIMIX_ACTION_EXECUTE:
 474         case SIMIX_ACTION_PARALLEL_EXECUTE:
 475           SIMIX_host_execution_resume(process->waiting_action);
 476           break;
 477
 478         case SIMIX_ACTION_COMMUNICATE:
 479           SIMIX_comm_resume(process->waiting_action);
 480           break;
 481
 482         case SIMIX_ACTION_SLEEP:
 483           SIMIX_process_sleep_resume(process->waiting_action);
 484           break;
 485
 486         case SIMIX_ACTION_SYNCHRO:
 487           /* I cannot resume it now. This is delayed to when the process is rescheduled at
 488            * the end of the synchro. */
 489           break;
 490
 491         default:
 492           xbt_die("Internal error in SIMIX_process_resume: unexpected action type %d",
 493               (int)process->waiting_action->type);
 494       }
 495     }
 496   } else XBT_WARN("Strange. Process %p is trying to resume himself.", issuer);
 497
 498   XBT_OUT();
 499 }
 500
 501 int SIMIX_process_get_maxpid(void) {
 502   return simix_process_maxpid;
 503 }
 504
 505 int SIMIX_process_count(void)
 506 {
 507   return xbt_swag_size(simix_global->process_list);
 508 }
 509
 510 void* SIMIX_process_self_get_data(smx_process_t self)
 511 {
 512   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 513
 514   if (!self) {
 515     return NULL;
 516   }
 517   return SIMIX_process_get_data(self);
 518 }
 519
 520 void SIMIX_process_self_set_data(smx_process_t self, void *data)
 521 {
 522   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 523
 524   SIMIX_process_set_data(self, data);
 525 }
 526
 527 void* SIMIX_process_get_data(smx_process_t process)
 528 {
 529   return process->data;
 530 }
 531
 532 void SIMIX_process_set_data(smx_process_t process, void *data)
 533 {
 534   process->data = data;
 535 }
 536
 537 smx_host_t SIMIX_process_get_host(smx_process_t process)
 538 {
 539   return process->smx_host;
 540 }
 541
 542 /* needs to be public and without simcall because it is called
 543    by exceptions and logging events */
 544 const char* SIMIX_process_self_get_name(void) {
 545
 546   smx_process_t process = SIMIX_process_self();
 547   if (process == NULL || process == simix_global->maestro_process)
 548     return "";
 549
 550   return SIMIX_process_get_name(process);
 551 }
 552
 553 const char* SIMIX_process_get_name(smx_process_t process)
 554 {
 555   return process->name;
 556 }
 557
 558 smx_process_t SIMIX_process_get_by_name(const char* name)
 559 {
 560   smx_process_t proc;
 561
 562   xbt_swag_foreach(proc, simix_global->process_list)
 563   {
 564     if(!strcmp(name, proc->name))
 565       return proc;
 566   }
 567   return NULL;
 568 }
 569
 570 int SIMIX_process_is_suspended(smx_process_t process)
 571 {
 572   return process->suspended;
 573 }
 574
 575 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
 576 {
 577   return process->properties;
 578 }
 579
 580 void SIMIX_pre_process_sleep(smx_simcall_t simcall)
 581 {
 582   if (MC_is_active()) {
 583     MC_process_clock_add(simcall->issuer, simcall->process_sleep.duration);
 584     simcall->process_sleep.result = SIMIX_DONE;
 585     SIMIX_simcall_answer(simcall);
 586     return;
 587   }
 588   smx_action_t action = SIMIX_process_sleep(simcall->issuer, simcall->process_sleep.duration);
 589   xbt_fifo_push(action->simcalls, simcall);
 590   simcall->issuer->waiting_action = action;
 591 }
 592
 593 smx_action_t SIMIX_process_sleep(smx_process_t process, double duration)
 594 {
 595   smx_action_t action;
 596   smx_host_t host = process->smx_host;
 597
 598   /* check if the host is active */
 599   if (surf_workstation_model->extension.
 600       workstation.get_state(host->host) != SURF_RESOURCE_ON) {
 601     THROWF(host_error, 0, "Host %s failed, you cannot call this function",
 602            host->name);
 603   }
 604
 605   action = xbt_mallocator_get(simix_global->action_mallocator);
 606   action->type = SIMIX_ACTION_SLEEP;
 607   action->name = NULL;
 608 #ifdef HAVE_TRACING
 609   action->category = NULL;
 610 #endif
 611
 612   action->sleep.host = host;
 613   action->sleep.surf_sleep =
 614       surf_workstation_model->extension.workstation.sleep(host->host, duration);
 615
 616   surf_workstation_model->action_data_set(action->sleep.surf_sleep, action);
 617   XBT_DEBUG("Create sleep action %p", action);
 618
 619   return action;
 620 }
 621
 622 void SIMIX_post_process_sleep(smx_action_t action)
 623 {
 624   smx_simcall_t simcall;
 625   e_smx_state_t state;
 626
 627   while ((simcall = xbt_fifo_shift(action->simcalls))) {
 628
 629     switch(surf_workstation_model->action_state_get(action->sleep.surf_sleep)){
 630       case SURF_ACTION_FAILED:
 631         simcall->issuer->context->iwannadie = 1;
 632         //SMX_EXCEPTION(simcall->issuer, host_error, 0, "Host failed");
 633         break;
 634
 635       case SURF_ACTION_DONE:
 636         state = SIMIX_DONE;
 637         break;
 638
 639       default:
 640         THROW_IMPOSSIBLE;
 641         break;
 642     }
 643     if (surf_workstation_model->extension.
 644         workstation.get_state(simcall->issuer->smx_host->host) != SURF_RESOURCE_ON) {
 645       simcall->issuer->context->iwannadie = 1;
 646     }
 647     simcall->process_sleep.result = state;
 648     simcall->issuer->waiting_action = NULL;
 649     SIMIX_simcall_answer(simcall);
 650
 651   }
 652   SIMIX_process_sleep_destroy(action);
 653 }
 654
 655 void SIMIX_process_sleep_destroy(smx_action_t action)
 656 {
 657   XBT_DEBUG("Destroy action %p", action);
 658   if (action->sleep.surf_sleep)
 659     action->sleep.surf_sleep->model_type->action_unref(action->sleep.surf_sleep);
 660   xbt_mallocator_release(simix_global->action_mallocator, action);
 661 }
 662
 663 void SIMIX_process_sleep_suspend(smx_action_t action)
 664 {
 665   surf_workstation_model->suspend(action->sleep.surf_sleep);
 666 }
 667
 668 void SIMIX_process_sleep_resume(smx_action_t action)
 669 {
 670   surf_workstation_model->resume(action->sleep.surf_sleep);
 671 }
 672
 673 /**
 674  * \brief Calling this function makes the process to yield.
 675  *
 676  * Only the current process can call this function, giving back the control to
 677  * maestro.
 678  *
 679  * \param self the current process
 680  */
 681 void SIMIX_process_yield(smx_process_t self)
 682 {
 683   XBT_DEBUG("Yield process '%s'", self->name);
 684
 685   /* Go into sleep and return control to maestro */
 686   SIMIX_context_suspend(self->context);
 687
 688   /* Ok, maestro returned control to us */
 689   XBT_DEBUG("Control returned to me: '%s'", self->name);
 690
 691   if (self->new_host) {
 692     SIMIX_process_change_host(self, self->new_host);
 693     self->new_host = NULL;
 694   }
 695
 696   if (self->context->iwannadie){
 697     XBT_DEBUG("I wanna die!");
 698     SIMIX_process_stop(self);
 699   }
 700
 701   if(self->suspended) {
 702     xbt_assert(!self->doexception, "Gloups! This exception may be lost by subsequent calls.");
 703     self->suspended = 0;
 704     SIMIX_process_suspend(self,self);
 705   }
 706
 707   if (self->doexception) {
 708     XBT_DEBUG("Wait, maestro left me an exception");
 709     self->doexception = 0;
 710     SMX_THROW();
 711   }
 712 }
 713
 714 /* callback: context fetching */
 715 xbt_running_ctx_t *SIMIX_process_get_running_context(void)
 716 {
 717   return SIMIX_process_self()->running_ctx;
 718 }
 719
 720 /* callback: termination */
 721 void SIMIX_process_exception_terminate(xbt_ex_t * e)
 722 {
 723   xbt_ex_display(e);
 724   xbt_abort();
 725 }
 726
 727 smx_context_t SIMIX_process_get_context(smx_process_t p) {
 728   return p->context;
 729 }
 730
 731 void SIMIX_process_set_context(smx_process_t p,smx_context_t c) {
 732   p->context = c;
 733 }
 734
 735 /**
 736  * \brief Returns the list of processes to run.
 737  */
 738 xbt_dynar_t SIMIX_process_get_runnable(void)
 739 {
 740   return simix_global->process_to_run;
 741 }
 742
 743 /**
 744  * \brief Returns the process from PID.
 745  */
 746 smx_process_t SIMIX_process_from_PID(int PID)
 747 {
 748   smx_process_t proc;
 749   xbt_swag_foreach(proc, simix_global->process_list)
 750   {
 751    if(proc->pid == PID)
 752    return proc;
 753   }
 754   return NULL;
 755 }
 756
 757 /** @brief returns a dynar containg all currently existing processes */
 758 xbt_dynar_t SIMIX_processes_as_dynar(void) {
 759   smx_process_t proc;
 760   xbt_dynar_t res = xbt_dynar_new(sizeof(smx_process_t),NULL);
 761   xbt_swag_foreach(proc, simix_global->process_list) {
 762     xbt_dynar_push(res,&proc);
 763   }
 764   return res;
 765 }
 766 void SIMIX_process_on_exit_runall(smx_process_t process) {
 767   s_smx_process_exit_fun_t exit_fun;
 768
 769   while (!xbt_dynar_is_empty(process->on_exit)) {
 770     exit_fun = xbt_dynar_pop_as(process->on_exit,s_smx_process_exit_fun_t);
 771     (exit_fun.fun)(exit_fun.arg);
 772   }
 773 }
 774 void SIMIX_process_on_exit(smx_process_t process, int_f_pvoid_t fun, void *data) {
 775   xbt_assert(process, "current process not found: are you in maestro context ?");
 776
 777   if (!process->on_exit) {
 778     process->on_exit = xbt_dynar_new(sizeof(s_smx_process_exit_fun_t), NULL);
 779   }
 780
 781   s_smx_process_exit_fun_t exit_fun = {fun, data};
 782
 783   xbt_dynar_push_as(process->on_exit,s_smx_process_exit_fun_t,exit_fun);
 784 }
 785 /**
 786  * \brief Sets the auto-restart status of the process.
 787  * If set to 1, the process will be automatically restarted when its host
 788  * comes back.
 789  */
 790 void SIMIX_process_auto_restart_set(smx_process_t process, int auto_restart) {
 791   process->auto_restart = auto_restart;
 792 }
 793 /**
 794  * \brief Restart a process.
 795  * Restart a process, starting it again from the beginning.
 796  */
 797 smx_process_t SIMIX_process_restart(smx_process_t process, smx_process_t issuer) {
 798   XBT_DEBUG("Restarting process %s on %s", process->name, process->smx_host->name);
 799   //retrieve the arguments of the old process
 800   //FIXME: Factorise this with SIMIX_host_add_auto_restart_process ?
 801   s_smx_process_arg_t arg;
 802   arg.code = process->code;
 803   arg.hostname = process->smx_host->name;
 804   arg.kill_time = process->kill_time;
 805   arg.argc = process->argc;
 806   arg.data = process->data;
 807   int i;
 808   arg.argv = xbt_new(char*,process->argc + 1);
 809   for (i = 0; i < arg.argc; i++) {
 810     arg.argv[i] = xbt_strdup(process->argv[i]);
 811   }
 812   arg.argv[process->argc] = NULL;
 813   arg.properties = NULL;
 814   arg.auto_restart = process->auto_restart;
 815   //kill the old process
 816   SIMIX_process_kill(process,issuer);
 817   //start the new process
 818   smx_process_t new_process;
 819   if (simix_global->create_process_function) {
 820     simix_global->create_process_function(&new_process,
 821                                           arg.argv[0],
 822                                           arg.code,
 823                                           arg.data,
 824                                           arg.hostname,
 825                                           arg.kill_time,
 826                                           arg.argc,
 827                                           arg.argv,
 828                                           arg.properties,
 829                                           arg.auto_restart);
 830   }
 831   else {
 832     simcall_process_create(&new_process,
 833                                           arg.argv[0],
 834                                           arg.code,
 835                                           arg.data,
 836                                           arg.hostname,
 837                                           arg.kill_time,
 838                                           arg.argc,
 839                                           arg.argv,
 840                                           arg.properties,
 841                                           arg.auto_restart);
 842
 843   }
 844   return new_process;
 845 }