src/simix/smx_process.c

   1 /* Copyright (c) 2007-2014. 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_process(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   SIMIX_process_on_exit_runall(process);
  53
  54   /* cancel non-blocking communications */
  55   smx_action_t action;
  56   while ((action = xbt_fifo_pop(process->comms))) {
  57
  58     /* make sure no one will finish the comm after this process is destroyed,
  59      * because src_proc or dst_proc would be an invalid pointer */
  60     SIMIX_comm_cancel(action);
  61
  62     if (action->comm.src_proc == process) {
  63       XBT_DEBUG("Found an unfinished send comm %p (detached = %d), state %d, src = %p, dst = %p",
  64           action, action->comm.detached, (int)action->state, action->comm.src_proc, action->comm.dst_proc);
  65       action->comm.src_proc = NULL;
  66
  67       /* I'm not supposed to destroy a detached comm from the sender side, */
  68       if (!action->comm.detached)
  69         SIMIX_comm_destroy(action);
  70       else
  71         XBT_DEBUG("Don't destroy it since it's a detached comm");
  72
  73     }
  74     else if (action->comm.dst_proc == process){
  75       XBT_DEBUG("Found an unfinished recv comm %p, state %d, src = %p, dst = %p",
  76           action, (int)action->state, action->comm.src_proc, action->comm.dst_proc);
  77       action->comm.dst_proc = NULL;
  78
  79       if (action->comm.detached && action->comm.refcount == 1
  80           && action->comm.src_proc != NULL) {
  81         /* the comm will be freed right now, remove it from the sender */
  82         xbt_fifo_remove(action->comm.src_proc->comms, action);
  83       }
  84       SIMIX_comm_destroy(action);
  85     }
  86     else {
  87       xbt_die("Communication action %p is in my list but I'm not the sender "
  88           "or the receiver", action);
  89     }
  90   }
  91
  92   xbt_swag_remove(process, simix_global->process_list);
  93   xbt_swag_remove(process, SIMIX_host_priv(process->smx_host)->process_list);
  94   xbt_swag_insert(process, simix_global->process_to_destroy);
  95   process->context->iwannadie = 0;
  96 }
  97
  98 /**
  99  * Garbage collection
 100  *
 101  * Should be called some time to time to free the memory allocated for processes
 102  * that have finished (or killed).
 103  */
 104 void SIMIX_process_empty_trash(void)
 105 {
 106   smx_process_t process = NULL;
 107
 108   while ((process = xbt_swag_extract(simix_global->process_to_destroy))) {
 109     SIMIX_context_free(process->context);
 110
 111     /* Free the exception allocated at creation time */
 112     free(process->running_ctx);
 113     xbt_dict_free(&process->properties);
 114
 115     xbt_fifo_free(process->comms);
 116
 117     xbt_dynar_free(&process->on_exit);
 118
 119     xbt_free(process->name);
 120     xbt_free(process);
 121   }
 122 }
 123
 124 /**
 125  * \brief Creates and runs the maestro process
 126  */
 127 void SIMIX_create_maestro_process()
 128 {
 129   smx_process_t maestro = NULL;
 130
 131   /* Create maestro process and intilialize it */
 132   maestro = xbt_new0(s_smx_process_t, 1);
 133   maestro->pid = simix_process_maxpid++;
 134   maestro->ppid = -1;
 135   maestro->name = (char *) "";
 136   maestro->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 137   XBT_RUNNING_CTX_INITIALIZE(maestro->running_ctx);
 138   maestro->context = SIMIX_context_new(NULL, 0, NULL, NULL, maestro);
 139   maestro->simcall.issuer = maestro;
 140   simix_global->maestro_process = maestro;
 141   return;
 142 }
 143 /**
 144  * \brief Stops a process.
 145  *
 146  * Stops the process, execute all the registered on_exit functions,
 147  * register it to the list of the process to restart if needed
 148  * and stops its context.
 149  */
 150 void SIMIX_process_stop(smx_process_t arg) {
 151   /* execute the on_exit functions */
 152   SIMIX_process_on_exit_runall(arg);
 153   /* Add the process to the list of process to restart, only if
 154    * the host is down
 155    */
 156   if (arg->auto_restart && !SIMIX_host_get_state(arg->smx_host)) {
 157     SIMIX_host_add_auto_restart_process(arg->smx_host,arg->name,arg->code, arg->data,
 158                                         sg_host_name(arg->smx_host),
 159                                         arg->kill_time,
 160                                         arg->argc,arg->argv,arg->properties,
 161                                         arg->auto_restart);
 162   }
 163   XBT_DEBUG("Process %s (%s) is dead",arg->name,sg_host_name(arg->smx_host));
 164   /* stop the context */
 165   SIMIX_context_stop(arg->context);
 166 }
 167
 168 /**
 169  * \brief Same as SIMIX_process_create() but with only one argument (used by timers).
 170  * This function frees the argument.
 171  * \return the process created
 172  */
 173 smx_process_t SIMIX_process_create_from_wrapper(smx_process_arg_t args) {
 174
 175   smx_process_t process;
 176   simix_global->create_process_function(&process,
 177                                         args->name,
 178                                         args->code,
 179                                         args->data,
 180                                         args->hostname,
 181                                         args->kill_time,
 182                                         args->argc,
 183                                         args->argv,
 184                                         args->properties,
 185                                         args->auto_restart,
 186                                         NULL);
 187   xbt_free(args);
 188   return process;
 189 }
 190
 191
 192 void SIMIX_pre_process_create(smx_simcall_t simcall,
 193                           smx_process_t *process,
 194                           const char *name,
 195                           xbt_main_func_t code,
 196                           void *data,
 197                           const char *hostname,
 198                           double kill_time,
 199                           int argc, char **argv,
 200                           xbt_dict_t properties,
 201                           int auto_restart){
 202   SIMIX_process_create(process, name, code, data, hostname,
 203                        kill_time, argc, argv, properties, auto_restart,
 204                        simcall->issuer);
 205 }
 206 /**
 207  * \brief Internal function to create a process.
 208  *
 209  * This function actually creates the process.
 210  * It may be called when a SIMCALL_PROCESS_CREATE simcall occurs,
 211  * or directly for SIMIX internal purposes. The sure thing is that it's called from maestro context.
 212  *
 213  * \return the process created
 214  */
 215 void SIMIX_process_create(smx_process_t *process,
 216                           const char *name,
 217                           xbt_main_func_t code,
 218                           void *data,
 219                           const char *hostname,
 220                           double kill_time,
 221                           int argc, char **argv,
 222                           xbt_dict_t properties,
 223                           int auto_restart,
 224                           smx_process_t parent_process)
 225 {
 226   *process = NULL;
 227   smx_host_t host = SIMIX_host_get_by_name(hostname);
 228
 229   XBT_DEBUG("Start process %s on host '%s'", name, hostname);
 230
 231   if (!SIMIX_host_get_state(host)) {
 232     int i;
 233     XBT_WARN("Cannot launch process '%s' on failed host '%s'", name,
 234           hostname);
 235     for (i = 0; i < argc; i++)
 236       xbt_free(argv[i]);
 237     xbt_free(argv);
 238   }
 239   else {
 240     *process = xbt_new0(s_smx_process_t, 1);
 241
 242     xbt_assert(((code != NULL) && (host != NULL)), "Invalid parameters");
 243     /* Process data */
 244     (*process)->pid = simix_process_maxpid++;
 245     (*process)->name = xbt_strdup(name);
 246     (*process)->smx_host = host;
 247     (*process)->data = data;
 248     (*process)->comms = xbt_fifo_new();
 249     (*process)->simcall.issuer = *process;
 250
 251      if (parent_process) {
 252        (*process)->ppid = SIMIX_process_get_PID(parent_process);
 253      } else {
 254        (*process)->ppid = -1;
 255      }
 256
 257     /* Process data for auto-restart */
 258     (*process)->auto_restart = auto_restart;
 259     (*process)->code = code;
 260     (*process)->argc = argc;
 261     (*process)->argv = argv;
 262     (*process)->kill_time = kill_time;
 263
 264
 265     XBT_VERB("Create context %s", (*process)->name);
 266     (*process)->context = SIMIX_context_new(code, argc, argv,
 267       simix_global->cleanup_process_function, *process);
 268
 269     (*process)->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 270     XBT_RUNNING_CTX_INITIALIZE((*process)->running_ctx);
 271
 272     if(MC_is_active()){
 273       MC_ignore_heap((*process)->running_ctx, sizeof(*(*process)->running_ctx));
 274     }
 275
 276     /* Add properties */
 277     (*process)->properties = properties;
 278
 279     /* Add the process to it's host process list */
 280     xbt_swag_insert(*process, SIMIX_host_priv(host)->process_list);
 281
 282     XBT_DEBUG("Start context '%s'", (*process)->name);
 283
 284     /* Now insert it in the global process list and in the process to run list */
 285     xbt_swag_insert(*process, simix_global->process_list);
 286     XBT_DEBUG("Inserting %s(%s) in the to_run list", (*process)->name, sg_host_name(host));
 287     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, *process);
 288
 289     if (kill_time > SIMIX_get_clock() && simix_global->kill_process_function) {
 290       XBT_DEBUG("Process %s(%s) will be kill at time %f", (*process)->name,
 291           sg_host_name((*process)->smx_host), kill_time);
 292       SIMIX_timer_set(kill_time, simix_global->kill_process_function, *process);
 293     }
 294   }
 295 }
 296
 297 /**
 298  * \brief Executes the processes from simix_global->process_to_run.
 299  *
 300  * The processes of simix_global->process_to_run are run (in parallel if
 301  * possible).  On exit, simix_global->process_to_run is empty, and
 302  * simix_global->process_that_ran contains the list of processes that just ran.
 303  * The two lists are swapped so, be careful when using them before and after a
 304  * call to this function.
 305  */
 306 void SIMIX_process_runall(void)
 307 {
 308   SIMIX_context_runall();
 309
 310   xbt_dynar_t tmp = simix_global->process_that_ran;
 311   simix_global->process_that_ran = simix_global->process_to_run;
 312   simix_global->process_to_run = tmp;
 313   xbt_dynar_reset(simix_global->process_to_run);
 314 }
 315
 316 void SIMIX_pre_process_kill(smx_simcall_t simcall, smx_process_t process) {
 317   SIMIX_process_kill(process, simcall->issuer);
 318 }
 319 /**
 320  * \brief Internal function to kill a SIMIX process.
 321  *
 322  * This function may be called when a SIMCALL_PROCESS_KILL simcall occurs,
 323  * or directly for SIMIX internal purposes.
 324  *
 325  * \param process poor victim
 326  * \param issuer the process which has sent the PROCESS_KILL. Important to not schedule twice the same process.
 327  */
 328 void SIMIX_process_kill(smx_process_t process, smx_process_t issuer) {
 329
 330   XBT_DEBUG("Killing process %s on %s", process->name, sg_host_name(process->smx_host));
 331
 332   process->context->iwannadie = 1;
 333   process->blocked = 0;
 334   process->suspended = 0;
 335   /* FIXME: set doexception to 0 also? */
 336
 337   /* destroy the blocking action if any */
 338   if (process->waiting_action) {
 339
 340     switch (process->waiting_action->type) {
 341
 342     case SIMIX_ACTION_EXECUTE:
 343     case SIMIX_ACTION_PARALLEL_EXECUTE:
 344       SIMIX_host_execution_destroy(process->waiting_action);
 345       break;
 346
 347     case SIMIX_ACTION_COMMUNICATE:
 348       xbt_fifo_remove(process->comms, process->waiting_action);
 349       SIMIX_comm_cancel(process->waiting_action);
 350       SIMIX_comm_destroy(process->waiting_action);
 351       break;
 352
 353     case SIMIX_ACTION_SLEEP:
 354       SIMIX_process_sleep_destroy(process->waiting_action);
 355       break;
 356
 357     case SIMIX_ACTION_JOIN:
 358       SIMIX_process_sleep_destroy(process->waiting_action);
 359       break;
 360
 361     case SIMIX_ACTION_SYNCHRO:
 362       SIMIX_synchro_stop_waiting(process, &process->simcall);
 363       SIMIX_synchro_destroy(process->waiting_action);
 364       break;
 365
 366     case SIMIX_ACTION_IO:
 367       SIMIX_io_destroy(process->waiting_action);
 368       break;
 369
 370       /* **************************************/
 371       /* TUTORIAL: New API                    */
 372     case SIMIX_ACTION_NEW_API:
 373       SIMIX_new_api_destroy(process->waiting_action);
 374       break;
 375       /* **************************************/
 376
 377     }
 378   }
 379   if(!xbt_dynar_member(simix_global->process_to_run, &(process)) && process != issuer) {
 380     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, process);
 381   }
 382
 383 }
 384
 385 void SIMIX_pre_process_killall(smx_simcall_t simcall, int reset_pid) {
 386   SIMIX_process_killall(simcall->issuer, reset_pid);
 387 }
 388 /**
 389  * \brief Kills all running processes.
 390  * \param issuer this one will not be killed
 391  */
 392 void SIMIX_process_killall(smx_process_t issuer, int reset_pid)
 393 {
 394   smx_process_t p = NULL;
 395
 396   while ((p = xbt_swag_extract(simix_global->process_list))) {
 397     if (p != issuer) {
 398       SIMIX_process_kill(p,issuer);
 399     }
 400   }
 401
 402   if (reset_pid > 0)
 403     simix_process_maxpid = reset_pid;
 404
 405   SIMIX_context_runall();
 406
 407   SIMIX_process_empty_trash();
 408 }
 409
 410 void SIMIX_pre_process_change_host(smx_simcall_t simcall, smx_process_t process,
 411                                    smx_host_t dest)
 412 {
 413   process->new_host = dest;
 414 }
 415 void SIMIX_process_change_host(smx_process_t process,
 416              smx_host_t dest)
 417 {
 418   xbt_assert((process != NULL), "Invalid parameters");
 419   xbt_swag_remove(process, SIMIX_host_priv(process->smx_host)->process_list);
 420   process->smx_host = dest;
 421   xbt_swag_insert(process, SIMIX_host_priv(dest)->process_list);
 422 }
 423
 424
 425 void SIMIX_pre_process_suspend(smx_simcall_t simcall, smx_process_t process)
 426 {
 427   smx_action_t action_suspend =
 428       SIMIX_process_suspend(process, simcall->issuer);
 429
 430   if (process != simcall->issuer) {
 431     SIMIX_simcall_answer(simcall);
 432   } else {
 433     xbt_fifo_push(action_suspend->simcalls, simcall);
 434     process->waiting_action = action_suspend;
 435     SIMIX_host_execution_suspend(process->waiting_action);
 436   }
 437   /* If we are suspending ourselves, then just do not finish the simcall now */
 438 }
 439
 440 smx_action_t SIMIX_process_suspend(smx_process_t process, smx_process_t issuer)
 441 {
 442   xbt_assert((process != NULL), "Invalid parameters");
 443
 444   if (process->suspended) {
 445     XBT_DEBUG("Process '%s' is already suspended", process->name);
 446     return NULL;
 447   }
 448
 449   process->suspended = 1;
 450
 451   /* If we are suspending another process, and it is waiting on an action,
 452      suspend its action. */
 453   if (process != issuer) {
 454
 455     if (process->waiting_action) {
 456
 457       switch (process->waiting_action->type) {
 458
 459         case SIMIX_ACTION_EXECUTE:
 460         case SIMIX_ACTION_PARALLEL_EXECUTE:
 461           SIMIX_host_execution_suspend(process->waiting_action);
 462           break;
 463
 464         case SIMIX_ACTION_COMMUNICATE:
 465           SIMIX_comm_suspend(process->waiting_action);
 466           break;
 467
 468         case SIMIX_ACTION_SLEEP:
 469           SIMIX_process_sleep_suspend(process->waiting_action);
 470           break;
 471
 472         case SIMIX_ACTION_SYNCHRO:
 473           /* Suspension is delayed to when the process is rescheduled. */
 474           break;
 475
 476         default:
 477           xbt_die("Internal error in SIMIX_process_suspend: unexpected action type %d",
 478               (int)process->waiting_action->type);
 479       }
 480       return NULL;
 481     } else {
 482       /* Suspension is delayed to when the process is rescheduled. */
 483       return NULL;
 484     }
 485   } else {
 486     /* FIXME: computation size is zero. Is it okay that bound is zero ? */
 487     return SIMIX_host_execute("suspend", process->smx_host, 0.0, 1.0, 0.0, 0);
 488   }
 489 }
 490
 491 void SIMIX_pre_process_resume(smx_simcall_t simcall, smx_process_t process){
 492   SIMIX_process_resume(process, simcall->issuer);
 493 }
 494
 495 void SIMIX_process_resume(smx_process_t process, smx_process_t issuer)
 496 {
 497   XBT_IN("process = %p, issuer = %p", process, issuer);
 498
 499   if(process->context->iwannadie) {
 500     XBT_VERB("Ignoring request to suspend a process that is currently dying.");
 501     return;
 502   }
 503
 504   if(!process->suspended) return;
 505   process->suspended = 0;
 506
 507   /* If we are resuming another process, resume the action it was waiting for
 508      if any. Otherwise add it to the list of process to run in the next round. */
 509   if (process != issuer) {
 510
 511     if (process->waiting_action) {
 512
 513       switch (process->waiting_action->type) {
 514
 515         case SIMIX_ACTION_EXECUTE:
 516         case SIMIX_ACTION_PARALLEL_EXECUTE:
 517           SIMIX_host_execution_resume(process->waiting_action);
 518           break;
 519
 520         case SIMIX_ACTION_COMMUNICATE:
 521           SIMIX_comm_resume(process->waiting_action);
 522           break;
 523
 524         case SIMIX_ACTION_SLEEP:
 525           SIMIX_process_sleep_resume(process->waiting_action);
 526           break;
 527
 528         case SIMIX_ACTION_SYNCHRO:
 529           /* I cannot resume it now. This is delayed to when the process is rescheduled at
 530            * the end of the synchro. */
 531           break;
 532
 533         default:
 534           xbt_die("Internal error in SIMIX_process_resume: unexpected action type %d",
 535               (int)process->waiting_action->type);
 536       }
 537     }
 538   } else XBT_WARN("Strange. Process %p is trying to resume himself.", issuer);
 539
 540   XBT_OUT();
 541 }
 542
 543 int SIMIX_process_get_maxpid(void) {
 544   return simix_process_maxpid;
 545 }
 546
 547 int SIMIX_pre_process_count(smx_simcall_t simcall){
 548   return SIMIX_process_count();
 549 }
 550 int SIMIX_process_count(void)
 551 {
 552   return xbt_swag_size(simix_global->process_list);
 553 }
 554
 555 int SIMIX_pre_process_get_PID(smx_simcall_t simcall, smx_process_t self){
 556    return SIMIX_process_get_PID(self);
 557 }
 558
 559 int SIMIX_process_get_PID(smx_process_t self){
 560   if (self == NULL)
 561     return 0;
 562   else
 563     return self->pid;
 564 }
 565
 566 int SIMIX_pre_process_get_PPID(smx_simcall_t simcall, smx_process_t self){
 567   return SIMIX_process_get_PPID(self);
 568 }
 569
 570 int SIMIX_process_get_PPID(smx_process_t self){
 571   if (self == NULL)
 572     return 0;
 573   else
 574     return self->ppid;
 575 }
 576
 577 void* SIMIX_pre_process_self_get_data(smx_simcall_t simcall, smx_process_t self){
 578   return SIMIX_process_self_get_data(self);
 579 }
 580
 581 void* SIMIX_process_self_get_data(smx_process_t self)
 582 {
 583   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 584
 585   if (!self) {
 586     return NULL;
 587   }
 588   return SIMIX_process_get_data(self);
 589 }
 590
 591 void SIMIX_pre_process_set_data(smx_simcall_t simcall, smx_process_t process,
 592                                 void *data){
 593   SIMIX_process_set_data(process, data);
 594 }
 595 void SIMIX_process_self_set_data(smx_process_t self, void *data)
 596 {
 597   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 598
 599   SIMIX_process_set_data(self, data);
 600 }
 601
 602 void* SIMIX_pre_process_get_data(smx_simcall_t simcall, smx_process_t process){
 603   return SIMIX_process_get_data(process);
 604 }
 605 void* SIMIX_process_get_data(smx_process_t process)
 606 {
 607   return process->data;
 608 }
 609
 610 void SIMIX_process_set_data(smx_process_t process, void *data)
 611 {
 612   process->data = data;
 613 }
 614
 615 smx_host_t SIMIX_pre_process_get_host(smx_simcall_t simcall, smx_process_t process){
 616   return SIMIX_process_get_host(process);
 617 }
 618 smx_host_t SIMIX_process_get_host(smx_process_t process)
 619 {
 620   return process->smx_host;
 621 }
 622
 623 /* needs to be public and without simcall because it is called
 624    by exceptions and logging events */
 625 const char* SIMIX_process_self_get_name(void) {
 626
 627   smx_process_t process = SIMIX_process_self();
 628   if (process == NULL || process == simix_global->maestro_process)
 629     return "";
 630
 631   return SIMIX_process_get_name(process);
 632 }
 633
 634 const char* SIMIX_pre_process_get_name(smx_simcall_t simcall, smx_process_t process) {
 635   return SIMIX_process_get_name(process);
 636 }
 637 const char* SIMIX_process_get_name(smx_process_t process)
 638 {
 639   return process->name;
 640 }
 641
 642 smx_process_t SIMIX_process_get_by_name(const char* name)
 643 {
 644   smx_process_t proc;
 645
 646   xbt_swag_foreach(proc, simix_global->process_list)
 647   {
 648     if(!strcmp(name, proc->name))
 649       return proc;
 650   }
 651   return NULL;
 652 }
 653
 654 int SIMIX_pre_process_is_suspended(smx_simcall_t simcall, smx_process_t process){
 655   return SIMIX_process_is_suspended(process);
 656 }
 657 int SIMIX_process_is_suspended(smx_process_t process)
 658 {
 659   return process->suspended;
 660 }
 661
 662 xbt_dict_t SIMIX_pre_process_get_properties(smx_simcall_t simcall, smx_process_t process){
 663   return SIMIX_process_get_properties(process);
 664 }
 665 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
 666 {
 667   return process->properties;
 668 }
 669
 670 void SIMIX_pre_process_join(smx_simcall_t simcall, smx_process_t process, double timeout)
 671 {
 672   smx_action_t action = SIMIX_process_join(simcall->issuer, process, timeout);
 673   xbt_fifo_push(action->simcalls, simcall);
 674   simcall->issuer->waiting_action = action;
 675 }
 676
 677 static int SIMIX_process_join_finish(smx_process_exit_status_t status, smx_action_t action){
 678   if (action->sleep.surf_sleep) {
 679     surf_action_cancel(action->sleep.surf_sleep);
 680
 681     smx_simcall_t simcall;
 682     while ((simcall = xbt_fifo_shift(action->simcalls))) {
 683       simcall_process_sleep__set__result(simcall, SIMIX_DONE);
 684       simcall->issuer->waiting_action = NULL;
 685       if (simcall->issuer->suspended) {
 686         XBT_DEBUG("Wait! This process is suspended and can't wake up now.");
 687         simcall->issuer->suspended = 0;
 688         SIMIX_pre_process_suspend(simcall, simcall->issuer);
 689       } else {
 690         SIMIX_simcall_answer(simcall);
 691       }
 692     }
 693     surf_action_unref(action->sleep.surf_sleep);
 694     action->sleep.surf_sleep = NULL;
 695   }
 696   xbt_mallocator_release(simix_global->action_mallocator, action);
 697   return 0;
 698 }
 699
 700 smx_action_t SIMIX_process_join(smx_process_t issuer, smx_process_t process, double timeout)
 701 {
 702   smx_action_t res = SIMIX_process_sleep(issuer, timeout);
 703   res->type = SIMIX_ACTION_JOIN;
 704   SIMIX_process_on_exit(process, (int_f_pvoid_pvoid_t)SIMIX_process_join_finish, res);
 705   return res;
 706 }
 707
 708 void SIMIX_pre_process_sleep(smx_simcall_t simcall, double duration)
 709 {
 710   if (MC_is_active()) {
 711     MC_process_clock_add(simcall->issuer, duration);
 712     simcall_process_sleep__set__result(simcall, SIMIX_DONE);
 713     SIMIX_simcall_answer(simcall);
 714     return;
 715   }
 716   smx_action_t action = SIMIX_process_sleep(simcall->issuer, duration);
 717   xbt_fifo_push(action->simcalls, simcall);
 718   simcall->issuer->waiting_action = action;
 719 }
 720
 721 smx_action_t SIMIX_process_sleep(smx_process_t process, double duration)
 722 {
 723   smx_action_t action;
 724   smx_host_t host = process->smx_host;
 725
 726   /* check if the host is active */
 727   if (surf_resource_get_state(surf_workstation_resource_priv(host)) != SURF_RESOURCE_ON) {
 728     THROWF(host_error, 0, "Host %s failed, you cannot call this function",
 729            sg_host_name(host));
 730   }
 731
 732   action = xbt_mallocator_get(simix_global->action_mallocator);
 733   action->type = SIMIX_ACTION_SLEEP;
 734   action->name = NULL;
 735 #ifdef HAVE_TRACING
 736   action->category = NULL;
 737 #endif
 738
 739   action->sleep.host = host;
 740   action->sleep.surf_sleep =
 741       surf_workstation_sleep(host, duration);
 742
 743   surf_action_set_data(action->sleep.surf_sleep, action);
 744   XBT_DEBUG("Create sleep action %p", action);
 745
 746   return action;
 747 }
 748
 749 void SIMIX_post_process_sleep(smx_action_t action)
 750 {
 751   smx_simcall_t simcall;
 752   e_smx_state_t state;
 753   xbt_assert(action->type == SIMIX_ACTION_SLEEP || action->type == SIMIX_ACTION_JOIN);
 754
 755   while ((simcall = xbt_fifo_shift(action->simcalls))) {
 756
 757     switch(surf_action_get_state(action->sleep.surf_sleep)){
 758       case SURF_ACTION_FAILED:
 759         simcall->issuer->context->iwannadie = 1;
 760         //SMX_EXCEPTION(simcall->issuer, host_error, 0, "Host failed");
 761         state = SIMIX_SRC_HOST_FAILURE;
 762         break;
 763
 764       case SURF_ACTION_DONE:
 765         state = SIMIX_DONE;
 766         break;
 767
 768       default:
 769         THROW_IMPOSSIBLE;
 770         break;
 771     }
 772     if (surf_resource_get_state(surf_workstation_resource_priv(simcall->issuer->smx_host)) != SURF_RESOURCE_ON) {
 773       simcall->issuer->context->iwannadie = 1;
 774     }
 775     simcall_process_sleep__set__result(simcall, state);
 776     simcall->issuer->waiting_action = NULL;
 777     if (simcall->issuer->suspended) {
 778       XBT_DEBUG("Wait! This process is suspended and can't wake up now.");
 779       simcall->issuer->suspended = 0;
 780       SIMIX_pre_process_suspend(simcall, simcall->issuer);
 781     } else {
 782       SIMIX_simcall_answer(simcall);
 783     }
 784   }
 785
 786   SIMIX_process_sleep_destroy(action);
 787 }
 788
 789 void SIMIX_process_sleep_destroy(smx_action_t action)
 790 {
 791   XBT_DEBUG("Destroy action %p", action);
 792   xbt_assert(action->type == SIMIX_ACTION_SLEEP || action->type == SIMIX_ACTION_JOIN);
 793
 794   if (action->sleep.surf_sleep) {
 795     surf_action_unref(action->sleep.surf_sleep);
 796     action->sleep.surf_sleep = NULL;
 797   }
 798   if (action->type == SIMIX_ACTION_SLEEP)
 799     xbt_mallocator_release(simix_global->action_mallocator, action);
 800 }
 801
 802 void SIMIX_process_sleep_suspend(smx_action_t action)
 803 {
 804   xbt_assert(action->type == SIMIX_ACTION_SLEEP);
 805   surf_action_suspend(action->sleep.surf_sleep);
 806 }
 807
 808 void SIMIX_process_sleep_resume(smx_action_t action)
 809 {
 810   XBT_DEBUG("Action state is %d on process_sleep_resume.", action->state);
 811   xbt_assert(action->type == SIMIX_ACTION_SLEEP);
 812   surf_action_resume(action->sleep.surf_sleep);
 813 }
 814
 815 /**
 816  * \brief Calling this function makes the process to yield.
 817  *
 818  * Only the current process can call this function, giving back the control to
 819  * maestro.
 820  *
 821  * \param self the current process
 822  */
 823 void SIMIX_process_yield(smx_process_t self)
 824 {
 825   XBT_DEBUG("Yield process '%s'", self->name);
 826
 827   /* Go into sleep and return control to maestro */
 828   SIMIX_context_suspend(self->context);
 829
 830   /* Ok, maestro returned control to us */
 831   XBT_DEBUG("Control returned to me: '%s'", self->name);
 832
 833   if (self->new_host) {
 834     SIMIX_process_change_host(self, self->new_host);
 835     self->new_host = NULL;
 836   }
 837
 838   if (self->context->iwannadie){
 839     XBT_DEBUG("I wanna die!");
 840     SIMIX_process_stop(self);
 841   }
 842
 843   if (self->suspended) {
 844     XBT_DEBUG("Hey! I'm suspended.");
 845     xbt_assert(!self->doexception, "Gasp! This exception may be lost by subsequent calls.");
 846     self->suspended = 0;
 847     SIMIX_process_suspend(self, self);
 848   }
 849
 850   if (self->doexception) {
 851     XBT_DEBUG("Wait, maestro left me an exception");
 852     self->doexception = 0;
 853     SMX_THROW();
 854   }
 855
 856 }
 857
 858 /* callback: context fetching */
 859 xbt_running_ctx_t *SIMIX_process_get_running_context(void)
 860 {
 861   return SIMIX_process_self()->running_ctx;
 862 }
 863
 864 /* callback: termination */
 865 void SIMIX_process_exception_terminate(xbt_ex_t * e)
 866 {
 867   xbt_ex_display(e);
 868   xbt_abort();
 869 }
 870
 871 smx_context_t SIMIX_process_get_context(smx_process_t p) {
 872   return p->context;
 873 }
 874
 875 void SIMIX_process_set_context(smx_process_t p,smx_context_t c) {
 876   p->context = c;
 877 }
 878
 879 /**
 880  * \brief Returns the list of processes to run.
 881  */
 882 xbt_dynar_t SIMIX_process_get_runnable(void)
 883 {
 884   return simix_global->process_to_run;
 885 }
 886
 887 /**
 888  * \brief Returns the process from PID.
 889  */
 890 smx_process_t SIMIX_process_from_PID(int PID)
 891 {
 892   smx_process_t proc;
 893   xbt_swag_foreach(proc, simix_global->process_list)
 894   {
 895    if(proc->pid == PID)
 896    return proc;
 897   }
 898   return NULL;
 899 }
 900
 901 /** @brief returns a dynar containg all currently existing processes */
 902 xbt_dynar_t SIMIX_processes_as_dynar(void) {
 903   smx_process_t proc;
 904   xbt_dynar_t res = xbt_dynar_new(sizeof(smx_process_t),NULL);
 905   xbt_swag_foreach(proc, simix_global->process_list) {
 906     xbt_dynar_push(res,&proc);
 907   }
 908   return res;
 909 }
 910
 911
 912 void SIMIX_process_on_exit_runall(smx_process_t process) {
 913   s_smx_process_exit_fun_t exit_fun;
 914   smx_process_exit_status_t exit_status = (process->context->iwannadie) ?
 915                                          SMX_EXIT_FAILURE : SMX_EXIT_SUCCESS;
 916   while (!xbt_dynar_is_empty(process->on_exit)) {
 917     exit_fun = xbt_dynar_pop_as(process->on_exit,s_smx_process_exit_fun_t);
 918     (exit_fun.fun)((void*)exit_status, exit_fun.arg);
 919   }
 920 }
 921
 922 void SIMIX_pre_process_on_exit(smx_simcall_t simcall, smx_process_t process,
 923                                int_f_pvoid_pvoid_t fun, void *data) {
 924   SIMIX_process_on_exit(process, fun, data);
 925 }
 926
 927 void SIMIX_process_on_exit(smx_process_t process, int_f_pvoid_pvoid_t fun, void *data) {
 928   xbt_assert(process, "current process not found: are you in maestro context ?");
 929
 930   if (!process->on_exit) {
 931     process->on_exit = xbt_dynar_new(sizeof(s_smx_process_exit_fun_t), NULL);
 932   }
 933
 934   s_smx_process_exit_fun_t exit_fun = {fun, data};
 935
 936   xbt_dynar_push_as(process->on_exit,s_smx_process_exit_fun_t,exit_fun);
 937 }
 938
 939 void SIMIX_pre_process_auto_restart_set(smx_simcall_t simcall, smx_process_t process,
 940                                         int auto_restart) {
 941   SIMIX_process_auto_restart_set(process, auto_restart);
 942 }
 943 /**
 944  * \brief Sets the auto-restart status of the process.
 945  * If set to 1, the process will be automatically restarted when its host
 946  * comes back.
 947  */
 948 void SIMIX_process_auto_restart_set(smx_process_t process, int auto_restart) {
 949   process->auto_restart = auto_restart;
 950 }
 951
 952 smx_process_t SIMIX_pre_process_restart(smx_simcall_t simcall, smx_process_t process) {
 953   return SIMIX_process_restart(process, simcall->issuer);
 954 }
 955 /**
 956  * \brief Restart a process.
 957  * Restart a process, starting it again from the beginning.
 958  */
 959 smx_process_t SIMIX_process_restart(smx_process_t process, smx_process_t issuer) {
 960   XBT_DEBUG("Restarting process %s on %s", process->name, sg_host_name(process->smx_host));
 961   //retrieve the arguments of the old process
 962   //FIXME: Factorise this with SIMIX_host_add_auto_restart_process ?
 963   s_smx_process_arg_t arg;
 964   arg.code = process->code;
 965   arg.hostname = sg_host_name(process->smx_host);
 966   arg.kill_time = process->kill_time;
 967   arg.argc = process->argc;
 968   arg.data = process->data;
 969   int i;
 970   arg.argv = xbt_new(char*,process->argc + 1);
 971   for (i = 0; i < arg.argc; i++) {
 972     arg.argv[i] = xbt_strdup(process->argv[i]);
 973   }
 974   arg.argv[process->argc] = NULL;
 975   arg.properties = NULL;
 976   arg.auto_restart = process->auto_restart;
 977   //kill the old process
 978   SIMIX_process_kill(process,issuer);
 979   //start the new process
 980   smx_process_t new_process;
 981   if (simix_global->create_process_function) {
 982     simix_global->create_process_function(&new_process,
 983                                           arg.argv[0],
 984                                           arg.code,
 985                                           arg.data,
 986                                           arg.hostname,
 987                                           arg.kill_time,
 988                                           arg.argc,
 989                                           arg.argv,
 990                                           arg.properties,
 991                                           arg.auto_restart,
 992                                           NULL);
 993   } else {
 994     simcall_process_create(&new_process,
 995                            arg.argv[0],
 996                            arg.code,
 997                            arg.data,
 998                            arg.hostname,
 999                            arg.kill_time,
1000                            arg.argc,
1001                            arg.argv,
1002                            arg.properties,
1003                            arg.auto_restart);
1004
1005   }
1006   return new_process;
1007 }