src/simix/smx_process.c

   1 /* Copyright (c) 2007-2012. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   4 /* This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the license (GNU LGPL) which comes with this package. */
   6
   7 #include "smx_private.h"
   8 #include "xbt/sysdep.h"
   9 #include "xbt/log.h"
  10 #include "xbt/dict.h"
  11 #include "mc/mc.h"
  12
  13 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_process, simix,
  14                                 "Logging specific to SIMIX (process)");
  15
  16 unsigned long simix_process_maxpid = 0;
  17
  18 /**
  19  * \brief Returns the current agent.
  20  *
  21  * This functions returns the currently running SIMIX process.
  22  *
  23  * \return The SIMIX process
  24  */
  25 XBT_INLINE smx_process_t SIMIX_process_self(void)
  26 {
  27   smx_context_t self_context = SIMIX_context_self();
  28
  29   return self_context ? SIMIX_context_get_data(self_context) : NULL;
  30 }
  31
  32 /**
  33  * \brief Returns whether a process has pending asynchronous communications.
  34  * \return true if there are asynchronous communications in this process
  35  */
  36 int SIMIX_process_has_pending_comms(smx_process_t process) {
  37
  38   return xbt_fifo_size(process->comms) > 0;
  39 }
  40
  41 void SIMIX_pre_process_cleanup(smx_simcall_t simcall, smx_process_t process) {
  42   SIMIX_process_cleanup(process);
  43 }
  44 /**
  45  * \brief Moves a process to the list of processes to destroy.
  46  */
  47 void SIMIX_process_cleanup(smx_process_t process)
  48 {
  49   XBT_DEBUG("Cleanup process %s (%p), waiting action %p",
  50       process->name, process, process->waiting_action);
  51
  52   /* cancel non-blocking communications */
  53   smx_action_t action;
  54   while ((action = xbt_fifo_pop(process->comms))) {
  55
  56     /* make sure no one will finish the comm after this process is destroyed,
  57      * because src_proc or dst_proc would be an invalid pointer */
  58     SIMIX_comm_cancel(action);
  59
  60     if (action->comm.src_proc == process) {
  61       XBT_DEBUG("Found an unfinished send comm %p (detached = %d), state %d, src = %p, dst = %p",
  62           action, action->comm.detached, (int)action->state, action->comm.src_proc, action->comm.dst_proc);
  63       action->comm.src_proc = NULL;
  64
  65       if (action->comm.detached) {
  66          if (action->comm.refcount == 0) {
  67            XBT_DEBUG("Increase the refcount before destroying it since it's detached");
  68            /* I'm not supposed to destroy a detached comm from the sender side,
  69             * unless there is no receiver matching the rdv */
  70            action->comm.refcount++;
  71            SIMIX_comm_destroy(action);
  72          }
  73          else {
  74            XBT_DEBUG("Don't destroy it since its refcount is %d", action->comm.refcount);
  75          }
  76       } else {
  77         SIMIX_comm_destroy(action);
  78       }
  79     }
  80     else if (action->comm.dst_proc == process){
  81       XBT_DEBUG("Found an unfinished recv comm %p, state %d, src = %p, dst = %p",
  82           action, (int)action->state, action->comm.src_proc, action->comm.dst_proc);
  83       action->comm.dst_proc = NULL;
  84
  85       if (action->comm.detached && action->comm.refcount == 1
  86           && action->comm.src_proc != NULL) {
  87         /* the comm will be freed right now, remove it from the sender */
  88         xbt_fifo_remove(action->comm.src_proc->comms, action);
  89       }
  90       SIMIX_comm_destroy(action);
  91     }
  92     else {
  93       xbt_die("Communication action %p is in my list but I'm not the sender "
  94           "or the receiver", action);
  95     }
  96   }
  97
  98   /*xbt_swag_remove(process, simix_global->process_to_run);*/
  99   xbt_swag_remove(process, simix_global->process_list);
 100   xbt_swag_remove(process, SIMIX_host_priv(process->smx_host)->process_list);
 101   xbt_swag_insert(process, simix_global->process_to_destroy);
 102   process->context->iwannadie = 0;
 103 }
 104
 105 /**
 106  * Garbage collection
 107  *
 108  * Should be called some time to time to free the memory allocated for processes
 109  * that have finished (or killed).
 110  */
 111 void SIMIX_process_empty_trash(void)
 112 {
 113   smx_process_t process = NULL;
 114
 115   while ((process = xbt_swag_extract(simix_global->process_to_destroy))) {
 116     SIMIX_context_free(process->context);
 117
 118     /* Free the exception allocated at creation time */
 119     free(process->running_ctx);
 120     xbt_dict_free(&process->properties);
 121
 122     xbt_fifo_free(process->comms);
 123
 124     xbt_dynar_free(&process->on_exit);
 125
 126     free(process->name);
 127     free(process);
 128   }
 129 }
 130
 131 /**
 132  * \brief Creates and runs the maestro process
 133  */
 134 void SIMIX_create_maestro_process()
 135 {
 136   smx_process_t maestro = NULL;
 137
 138   /* Create maestro process and intilialize it */
 139   maestro = xbt_new0(s_smx_process_t, 1);
 140   maestro->pid = simix_process_maxpid++;
 141   maestro->name = (char *) "";
 142   maestro->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 143   XBT_RUNNING_CTX_INITIALIZE(maestro->running_ctx);
 144   maestro->context = SIMIX_context_new(NULL, 0, NULL, NULL, maestro);
 145   maestro->simcall.issuer = maestro;
 146
 147   if (SIMIX_process_self()) {
 148     maestro->ppid = SIMIX_process_get_PID(SIMIX_process_self());
 149   } else {
 150     maestro->ppid = -1;
 151   }
 152
 153   simix_global->maestro_process = maestro;
 154   return;
 155 }
 156 /**
 157  * \brief Stops a process.
 158  *
 159  * Stops the process, execute all the registered on_exit functions,
 160  * register it to the list of the process to restart if needed
 161  * and stops its context.
 162  */
 163 void SIMIX_process_stop(smx_process_t arg) {
 164   /* execute the on_exit functions */
 165   SIMIX_process_on_exit_runall(arg);
 166   /* Add the process to the list of process to restart, only if
 167    * the host is down
 168    */
 169   if (arg->auto_restart && !SIMIX_host_get_state(arg->smx_host)) {
 170     SIMIX_host_add_auto_restart_process(arg->smx_host,arg->name,arg->code, arg->data,
 171                                         sg_host_name(arg->smx_host),
 172                                         arg->kill_time,
 173                                         arg->argc,arg->argv,arg->properties,
 174                                         arg->auto_restart);
 175   }
 176   XBT_DEBUG("Process %s (%s) is dead",arg->name,sg_host_name(arg->smx_host));
 177   /* stop the context */
 178   SIMIX_context_stop(arg->context);
 179 }
 180
 181 /**
 182  * \brief Same as SIMIX_process_create() but with only one argument (used by timers).
 183  * This function frees the argument.
 184  * \return the process created
 185  */
 186 smx_process_t SIMIX_process_create_from_wrapper(smx_process_arg_t args) {
 187
 188   smx_process_t process;
 189   simix_global->create_process_function(
 190       &process,
 191       args->name,
 192       args->code,
 193       args->data,
 194       args->hostname,
 195       args->kill_time,
 196       args->argc,
 197       args->argv,
 198       args->properties,
 199       args->auto_restart);
 200   xbt_free(args);
 201   return process;
 202 }
 203
 204
 205 void SIMIX_pre_process_create(smx_simcall_t simcall,
 206                           smx_process_t *process,
 207                           const char *name,
 208                           xbt_main_func_t code,
 209                           void *data,
 210                           const char *hostname,
 211                           double kill_time,
 212                           int argc, char **argv,
 213                           xbt_dict_t properties,
 214                           int auto_restart){
 215   return SIMIX_process_create(process, name, code, data, hostname,
 216                               kill_time, argc, argv, properties, auto_restart);
 217 }
 218 /**
 219  * \brief Internal function to create a process.
 220  *
 221  * This function actually creates the process.
 222  * It may be called when a SIMCALL_PROCESS_CREATE simcall occurs,
 223  * or directly for SIMIX internal purposes. The sure thing is that it's called from maestro context.
 224  *
 225  * \return the process created
 226  */
 227 void SIMIX_process_create(smx_process_t *process,
 228                           const char *name,
 229                           xbt_main_func_t code,
 230                           void *data,
 231                           const char *hostname,
 232                           double kill_time,
 233                           int argc, char **argv,
 234                           xbt_dict_t properties,
 235                           int auto_restart) {
 236
 237   *process = NULL;
 238   smx_host_t host = SIMIX_host_get_by_name(hostname);
 239
 240   XBT_DEBUG("Start process %s on host '%s'", name, hostname);
 241
 242   if (!SIMIX_host_get_state(host)) {
 243     XBT_WARN("Cannot launch process '%s' on failed host '%s'", name,
 244           hostname);
 245   }
 246   else {
 247     *process = xbt_new0(s_smx_process_t, 1);
 248
 249     xbt_assert(((code != NULL) && (host != NULL)), "Invalid parameters");
 250     /* Process data */
 251     (*process)->pid = simix_process_maxpid++;
 252     (*process)->name = xbt_strdup(name);
 253     (*process)->smx_host = host;
 254     (*process)->data = data;
 255     (*process)->comms = xbt_fifo_new();
 256     (*process)->simcall.issuer = *process;
 257
 258      if (SIMIX_process_self()) {
 259        (*process)->ppid = SIMIX_process_get_PID(SIMIX_process_self());
 260      } else {
 261        (*process)->ppid = -1;
 262      }
 263
 264     /* Process data for auto-restart */
 265     (*process)->auto_restart = auto_restart;
 266     (*process)->code = code;
 267     (*process)->argc = argc;
 268     (*process)->argv = argv;
 269     (*process)->kill_time = kill_time;
 270
 271
 272     XBT_VERB("Create context %s", (*process)->name);
 273     (*process)->context = SIMIX_context_new(code, argc, argv,
 274       simix_global->cleanup_process_function, *process);
 275
 276     (*process)->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 277     XBT_RUNNING_CTX_INITIALIZE((*process)->running_ctx);
 278
 279     /* Add properties */
 280     (*process)->properties = properties;
 281
 282     /* Add the process to it's host process list */
 283     xbt_swag_insert(*process, SIMIX_host_priv(host)->process_list);
 284
 285     XBT_DEBUG("Start context '%s'", (*process)->name);
 286
 287     /* Now insert it in the global process list and in the process to run list */
 288     xbt_swag_insert(*process, simix_global->process_list);
 289     XBT_DEBUG("Inserting %s(%s) in the to_run list", (*process)->name, sg_host_name(host));
 290     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, *process);
 291   }
 292
 293   if (kill_time > SIMIX_get_clock()) {
 294     if (simix_global->kill_process_function) {
 295       XBT_DEBUG("Process %s(%s) will be kill at time %f", (*process)->name,
 296           sg_host_name((*process)->smx_host), kill_time);
 297       SIMIX_timer_set(kill_time, simix_global->kill_process_function, *process);
 298     }
 299   }
 300 }
 301
 302 /**
 303  * \brief Executes the processes from simix_global->process_to_run.
 304  *
 305  * The processes of simix_global->process_to_run are run (in parallel if
 306  * possible).  On exit, simix_global->process_to_run is empty, and
 307  * simix_global->process_that_ran contains the list of processes that just ran.
 308  * The two lists are swapped so, be careful when using them before and after a
 309  * call to this function.
 310  */
 311 void SIMIX_process_runall(void)
 312 {
 313   SIMIX_context_runall();
 314
 315   xbt_dynar_t tmp = simix_global->process_that_ran;
 316   simix_global->process_that_ran = simix_global->process_to_run;
 317   simix_global->process_to_run = tmp;
 318   xbt_dynar_reset(simix_global->process_to_run);
 319 }
 320
 321 void SIMIX_pre_process_kill(smx_simcall_t simcall, smx_process_t process) {
 322   SIMIX_process_kill(process, simcall->issuer);
 323 }
 324 /**
 325  * \brief Internal function to kill a SIMIX process.
 326  *
 327  * This function may be called when a SIMCALL_PROCESS_KILL simcall occurs,
 328  * or directly for SIMIX internal purposes.
 329  *
 330  * \param process poor victim
 331  * \param issuer the process which has sent the PROCESS_KILL. Important to not schedule twice the same process.
 332  */
 333 void SIMIX_process_kill(smx_process_t process, smx_process_t issuer) {
 334
 335   XBT_DEBUG("Killing process %s on %s", process->name, sg_host_name(process->smx_host));
 336
 337   process->context->iwannadie = 1;
 338   process->blocked = 0;
 339   process->suspended = 0;
 340   /* FIXME: set doexception to 0 also? */
 341
 342   /* destroy the blocking action if any */
 343   if (process->waiting_action) {
 344
 345     switch (process->waiting_action->type) {
 346
 347     case SIMIX_ACTION_EXECUTE:
 348     case SIMIX_ACTION_PARALLEL_EXECUTE:
 349       SIMIX_host_execution_destroy(process->waiting_action);
 350       break;
 351
 352     case SIMIX_ACTION_COMMUNICATE:
 353       xbt_fifo_remove(process->comms, process->waiting_action);
 354       SIMIX_comm_cancel(process->waiting_action);
 355       SIMIX_comm_destroy(process->waiting_action);
 356       break;
 357
 358     case SIMIX_ACTION_SLEEP:
 359       SIMIX_process_sleep_destroy(process->waiting_action);
 360       break;
 361
 362     case SIMIX_ACTION_SYNCHRO:
 363       SIMIX_synchro_stop_waiting(process, &process->simcall);
 364       SIMIX_synchro_destroy(process->waiting_action);
 365       break;
 366
 367     case SIMIX_ACTION_IO:
 368       SIMIX_io_destroy(process->waiting_action);
 369       break;
 370
 371       /* **************************************/
 372       /* TUTORIAL: New API                    */
 373     case SIMIX_ACTION_NEW_API:
 374       SIMIX_new_api_destroy(process->waiting_action);
 375       break;
 376       /* **************************************/
 377
 378     }
 379   }
 380   if(!xbt_dynar_member(simix_global->process_to_run, &(process)) && process != issuer) {
 381     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, process);
 382   }
 383
 384 }
 385
 386 void SIMIX_pre_process_killall(smx_simcall_t simcall, int reset_pid) {
 387   SIMIX_process_killall(simcall->issuer, reset_pid);
 388 }
 389 /**
 390  * \brief Kills all running processes.
 391  * \param issuer this one will not be killed
 392  */
 393 void SIMIX_process_killall(smx_process_t issuer, int reset_pid)
 394 {
 395   smx_process_t p = NULL;
 396
 397   while ((p = xbt_swag_extract(simix_global->process_list))) {
 398     if (p != issuer) {
 399       SIMIX_process_kill(p,issuer);
 400     }
 401   }
 402
 403   if (reset_pid > 0)
 404     simix_process_maxpid = reset_pid;
 405
 406   SIMIX_context_runall();
 407
 408   SIMIX_process_empty_trash();
 409 }
 410
 411 void SIMIX_pre_process_change_host(smx_simcall_t simcall, smx_process_t process,
 412                                    smx_host_t dest)
 413 {
 414   process->new_host = dest;
 415 }
 416 void SIMIX_process_change_host(smx_process_t process,
 417              smx_host_t dest)
 418 {
 419   xbt_assert((process != NULL), "Invalid parameters");
 420   xbt_swag_remove(process, SIMIX_host_priv(process->smx_host)->process_list);
 421   process->smx_host = dest;
 422   xbt_swag_insert(process, SIMIX_host_priv(dest)->process_list);
 423 }
 424
 425
 426 void SIMIX_pre_process_suspend(smx_simcall_t simcall, smx_process_t process)
 427 {
 428   smx_action_t action_suspend =
 429       SIMIX_process_suspend(process, simcall->issuer);
 430
 431   if (process != simcall->issuer) {
 432     SIMIX_simcall_answer(simcall);
 433   } else {
 434     xbt_fifo_push(action_suspend->simcalls, simcall);
 435     process->waiting_action = action_suspend;
 436     SIMIX_host_execution_suspend(process->waiting_action);
 437   }
 438   /* If we are suspending ourselves, then just do not finish the simcall now */
 439 }
 440
 441 smx_action_t SIMIX_process_suspend(smx_process_t process, smx_process_t issuer)
 442 {
 443   xbt_assert((process != NULL), "Invalid parameters");
 444
 445   if (process->suspended) {
 446     XBT_DEBUG("Process '%s' is already suspended", process->name);
 447     return NULL;
 448   }
 449
 450   process->suspended = 1;
 451
 452   /* If we are suspending another process, and it is waiting on an action,
 453      suspend its action. */
 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_suspend(process->waiting_action);
 463           break;
 464
 465         case SIMIX_ACTION_COMMUNICATE:
 466           SIMIX_comm_suspend(process->waiting_action);
 467           break;
 468
 469         case SIMIX_ACTION_SLEEP:
 470           SIMIX_process_sleep_suspend(process->waiting_action);
 471           break;
 472
 473         case SIMIX_ACTION_SYNCHRO:
 474           /* Suspension is delayed to when the process is rescheduled. */
 475           break;
 476
 477         default:
 478           xbt_die("Internal error in SIMIX_process_suspend: unexpected action type %d",
 479               (int)process->waiting_action->type);
 480       }
 481       return NULL;
 482     } else {
 483       /* Suspension is delayed to when the process is rescheduled. */
 484       return NULL;
 485     }
 486   } else {
 487     return SIMIX_host_execute("suspend", process->smx_host, 0.0, 1.0);
 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_assert((process != NULL), "Invalid parameters");
 498
 499   XBT_IN("process = %p, issuer = %p", process, issuer);
 500
 501   if(process->context->iwannadie) {
 502     XBT_VERB("Ignoring request to suspend a process that is currently dying.");
 503     return;
 504   }
 505
 506   if(!process->suspended) return;
 507   process->suspended = 0;
 508
 509   /* If we are resuming another process, resume the action it was waiting for
 510      if any. Otherwise add it to the list of process to run in the next round. */
 511   if (process != issuer) {
 512
 513     if (process->waiting_action) {
 514
 515       switch (process->waiting_action->type) {
 516
 517         case SIMIX_ACTION_EXECUTE:
 518         case SIMIX_ACTION_PARALLEL_EXECUTE:
 519           SIMIX_host_execution_resume(process->waiting_action);
 520           break;
 521
 522         case SIMIX_ACTION_COMMUNICATE:
 523           SIMIX_comm_resume(process->waiting_action);
 524           break;
 525
 526         case SIMIX_ACTION_SLEEP:
 527           SIMIX_process_sleep_resume(process->waiting_action);
 528           break;
 529
 530         case SIMIX_ACTION_SYNCHRO:
 531           /* I cannot resume it now. This is delayed to when the process is rescheduled at
 532            * the end of the synchro. */
 533           break;
 534
 535         default:
 536           xbt_die("Internal error in SIMIX_process_resume: unexpected action type %d",
 537               (int)process->waiting_action->type);
 538       }
 539     }
 540   } else XBT_WARN("Strange. Process %p is trying to resume himself.", issuer);
 541
 542   XBT_OUT();
 543 }
 544
 545 int SIMIX_process_get_maxpid(void) {
 546   return simix_process_maxpid;
 547 }
 548
 549 int SIMIX_pre_process_count(smx_simcall_t simcall){
 550   return SIMIX_process_count();
 551 }
 552 int SIMIX_process_count(void)
 553 {
 554   return xbt_swag_size(simix_global->process_list);
 555 }
 556
 557 int SIMIX_pre_process_get_PID(smx_simcall_t simcall, smx_process_t self){
 558    return SIMIX_process_get_PID(self);
 559 }
 560
 561 int SIMIX_process_get_PID(smx_process_t self){
 562   if (self == NULL)
 563     return 0;
 564   else
 565     return self->pid;
 566 }
 567
 568 int SIMIX_pre_process_get_PPID(smx_simcall_t simcall, smx_process_t self){
 569   return SIMIX_process_get_PPID(self);
 570 }
 571
 572 int SIMIX_process_get_PPID(smx_process_t self){
 573   if (self == NULL)
 574     return 0;
 575   else
 576     return self->ppid;
 577 }
 578
 579 void* SIMIX_pre_process_self_get_data(smx_simcall_t simcall, smx_process_t self){
 580   return SIMIX_process_self_get_data(self);
 581 }
 582
 583 void* SIMIX_process_self_get_data(smx_process_t self)
 584 {
 585   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 586
 587   if (!self) {
 588     return NULL;
 589   }
 590   return SIMIX_process_get_data(self);
 591 }
 592
 593 void SIMIX_pre_process_set_data(smx_simcall_t simcall, smx_process_t process,
 594                                 void *data){
 595   SIMIX_process_set_data(process, data);
 596 }
 597 void SIMIX_process_self_set_data(smx_process_t self, void *data)
 598 {
 599   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 600
 601   SIMIX_process_set_data(self, data);
 602 }
 603
 604 void* SIMIX_pre_process_get_data(smx_simcall_t simcall, smx_process_t process){
 605   return SIMIX_process_get_data(process);
 606 }
 607 void* SIMIX_process_get_data(smx_process_t process)
 608 {
 609   return process->data;
 610 }
 611
 612 void SIMIX_process_set_data(smx_process_t process, void *data)
 613 {
 614   process->data = data;
 615 }
 616
 617 smx_host_t SIMIX_pre_process_get_host(smx_simcall_t simcall, smx_process_t process){
 618   return SIMIX_process_get_host(process);
 619 }
 620 smx_host_t SIMIX_process_get_host(smx_process_t process)
 621 {
 622   return process->smx_host;
 623 }
 624
 625 /* needs to be public and without simcall because it is called
 626    by exceptions and logging events */
 627 const char* SIMIX_process_self_get_name(void) {
 628
 629   smx_process_t process = SIMIX_process_self();
 630   if (process == NULL || process == simix_global->maestro_process)
 631     return "";
 632
 633   return SIMIX_process_get_name(process);
 634 }
 635
 636 const char* SIMIX_pre_process_get_name(smx_simcall_t simcall, smx_process_t process) {
 637   return SIMIX_process_get_name(process);
 638 }
 639 const char* SIMIX_process_get_name(smx_process_t process)
 640 {
 641   return process->name;
 642 }
 643
 644 smx_process_t SIMIX_process_get_by_name(const char* name)
 645 {
 646   smx_process_t proc;
 647
 648   xbt_swag_foreach(proc, simix_global->process_list)
 649   {
 650     if(!strcmp(name, proc->name))
 651       return proc;
 652   }
 653   return NULL;
 654 }
 655
 656 int SIMIX_pre_process_is_suspended(smx_simcall_t simcall, smx_process_t process){
 657   return SIMIX_process_is_suspended(process);
 658 }
 659 int SIMIX_process_is_suspended(smx_process_t process)
 660 {
 661   return process->suspended;
 662 }
 663
 664 xbt_dict_t SIMIX_pre_process_get_properties(smx_simcall_t simcall, smx_process_t process){
 665   return SIMIX_process_get_properties(process);
 666 }
 667 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
 668 {
 669   return process->properties;
 670 }
 671
 672 void SIMIX_pre_process_sleep(smx_simcall_t simcall, double duration)
 673 {
 674   if (MC_is_active()) {
 675     MC_process_clock_add(simcall->issuer, duration);
 676     simcall_process_sleep__set__result(simcall, SIMIX_DONE);
 677     SIMIX_simcall_answer(simcall);
 678     return;
 679   }
 680   smx_action_t action = SIMIX_process_sleep(simcall->issuer, duration);
 681   xbt_fifo_push(action->simcalls, simcall);
 682   simcall->issuer->waiting_action = action;
 683 }
 684
 685 smx_action_t SIMIX_process_sleep(smx_process_t process, double duration)
 686 {
 687   smx_action_t action;
 688   smx_host_t host = process->smx_host;
 689
 690   /* check if the host is active */
 691   if (surf_workstation_model->extension.
 692       workstation.get_state(host) != SURF_RESOURCE_ON) {
 693     THROWF(host_error, 0, "Host %s failed, you cannot call this function",
 694            sg_host_name(host));
 695   }
 696
 697   action = xbt_mallocator_get(simix_global->action_mallocator);
 698   action->type = SIMIX_ACTION_SLEEP;
 699   action->name = NULL;
 700 #ifdef HAVE_TRACING
 701   action->category = NULL;
 702 #endif
 703
 704   action->sleep.host = host;
 705   action->sleep.surf_sleep =
 706       surf_workstation_model->extension.workstation.sleep(host, duration);
 707
 708   surf_workstation_model->action_data_set(action->sleep.surf_sleep, action);
 709   XBT_DEBUG("Create sleep action %p", action);
 710
 711   return action;
 712 }
 713
 714 void SIMIX_post_process_sleep(smx_action_t action)
 715 {
 716   smx_simcall_t simcall;
 717   e_smx_state_t state;
 718
 719   while ((simcall = xbt_fifo_shift(action->simcalls))) {
 720
 721     switch(surf_workstation_model->action_state_get(action->sleep.surf_sleep)){
 722       case SURF_ACTION_FAILED:
 723         simcall->issuer->context->iwannadie = 1;
 724         //SMX_EXCEPTION(simcall->issuer, host_error, 0, "Host failed");
 725         state = SIMIX_SRC_HOST_FAILURE;
 726         break;
 727
 728       case SURF_ACTION_DONE:
 729         state = SIMIX_DONE;
 730         break;
 731
 732       default:
 733         THROW_IMPOSSIBLE;
 734         break;
 735     }
 736     if (surf_workstation_model->extension.
 737         workstation.get_state(simcall->issuer->smx_host) != SURF_RESOURCE_ON) {
 738       simcall->issuer->context->iwannadie = 1;
 739     }
 740     simcall_process_sleep__set__result(simcall, state);
 741     simcall->issuer->waiting_action = NULL;
 742     SIMIX_simcall_answer(simcall);
 743
 744   }
 745   SIMIX_process_sleep_destroy(action);
 746 }
 747
 748 void SIMIX_process_sleep_destroy(smx_action_t action)
 749 {
 750   XBT_DEBUG("Destroy action %p", action);
 751   if (action->sleep.surf_sleep)
 752     action->sleep.surf_sleep->model_type->action_unref(action->sleep.surf_sleep);
 753   xbt_mallocator_release(simix_global->action_mallocator, action);
 754 }
 755
 756 void SIMIX_process_sleep_suspend(smx_action_t action)
 757 {
 758   surf_workstation_model->suspend(action->sleep.surf_sleep);
 759 }
 760
 761 void SIMIX_process_sleep_resume(smx_action_t action)
 762 {
 763   surf_workstation_model->resume(action->sleep.surf_sleep);
 764 }
 765
 766 /**
 767  * \brief Calling this function makes the process to yield.
 768  *
 769  * Only the current process can call this function, giving back the control to
 770  * maestro.
 771  *
 772  * \param self the current process
 773  */
 774 void SIMIX_process_yield(smx_process_t self)
 775 {
 776   XBT_DEBUG("Yield process '%s'", self->name);
 777
 778   /* Go into sleep and return control to maestro */
 779   SIMIX_context_suspend(self->context);
 780
 781   /* Ok, maestro returned control to us */
 782   XBT_DEBUG("Control returned to me: '%s'", self->name);
 783
 784   if (self->new_host) {
 785     SIMIX_process_change_host(self, self->new_host);
 786     self->new_host = NULL;
 787   }
 788
 789   if (self->context->iwannadie){
 790     XBT_DEBUG("I wanna die!");
 791     SIMIX_process_stop(self);
 792   }
 793
 794   if(self->suspended) {
 795     xbt_assert(!self->doexception, "Gloups! This exception may be lost by subsequent calls.");
 796     self->suspended = 0;
 797     SIMIX_process_suspend(self,self);
 798   }
 799
 800   if (self->doexception) {
 801     XBT_DEBUG("Wait, maestro left me an exception");
 802     self->doexception = 0;
 803     SMX_THROW();
 804   }
 805
 806 }
 807
 808 /* callback: context fetching */
 809 xbt_running_ctx_t *SIMIX_process_get_running_context(void)
 810 {
 811   return SIMIX_process_self()->running_ctx;
 812 }
 813
 814 /* callback: termination */
 815 void SIMIX_process_exception_terminate(xbt_ex_t * e)
 816 {
 817   xbt_ex_display(e);
 818   xbt_abort();
 819 }
 820
 821 smx_context_t SIMIX_process_get_context(smx_process_t p) {
 822   return p->context;
 823 }
 824
 825 void SIMIX_process_set_context(smx_process_t p,smx_context_t c) {
 826   p->context = c;
 827 }
 828
 829 /**
 830  * \brief Returns the list of processes to run.
 831  */
 832 xbt_dynar_t SIMIX_process_get_runnable(void)
 833 {
 834   return simix_global->process_to_run;
 835 }
 836
 837 /**
 838  * \brief Returns the process from PID.
 839  */
 840 smx_process_t SIMIX_process_from_PID(int PID)
 841 {
 842   smx_process_t proc;
 843   xbt_swag_foreach(proc, simix_global->process_list)
 844   {
 845    if(proc->pid == PID)
 846    return proc;
 847   }
 848   return NULL;
 849 }
 850
 851 /** @brief returns a dynar containg all currently existing processes */
 852 xbt_dynar_t SIMIX_processes_as_dynar(void) {
 853   smx_process_t proc;
 854   xbt_dynar_t res = xbt_dynar_new(sizeof(smx_process_t),NULL);
 855   xbt_swag_foreach(proc, simix_global->process_list) {
 856     xbt_dynar_push(res,&proc);
 857   }
 858   return res;
 859 }
 860
 861
 862 void SIMIX_process_on_exit_runall(smx_process_t process) {
 863   s_smx_process_exit_fun_t exit_fun;
 864
 865   while (!xbt_dynar_is_empty(process->on_exit)) {
 866     exit_fun = xbt_dynar_pop_as(process->on_exit,s_smx_process_exit_fun_t);
 867     (exit_fun.fun)(exit_fun.arg);
 868   }
 869 }
 870
 871 void SIMIX_pre_process_on_exit(smx_simcall_t simcall, smx_process_t process,
 872                                int_f_pvoid_t fun, void *data) {
 873   SIMIX_process_on_exit(process, fun, data);
 874 }
 875
 876 void SIMIX_process_on_exit(smx_process_t process, int_f_pvoid_t fun, void *data) {
 877   xbt_assert(process, "current process not found: are you in maestro context ?");
 878
 879   if (!process->on_exit) {
 880     process->on_exit = xbt_dynar_new(sizeof(s_smx_process_exit_fun_t), NULL);
 881   }
 882
 883   s_smx_process_exit_fun_t exit_fun = {fun, data};
 884
 885   xbt_dynar_push_as(process->on_exit,s_smx_process_exit_fun_t,exit_fun);
 886 }
 887
 888 void SIMIX_pre_process_auto_restart_set(smx_simcall_t simcall, smx_process_t process,
 889                                         int auto_restart) {
 890   SIMIX_process_auto_restart_set(process, auto_restart);
 891 }
 892 /**
 893  * \brief Sets the auto-restart status of the process.
 894  * If set to 1, the process will be automatically restarted when its host
 895  * comes back.
 896  */
 897 void SIMIX_process_auto_restart_set(smx_process_t process, int auto_restart) {
 898   process->auto_restart = auto_restart;
 899 }
 900
 901 smx_process_t SIMIX_pre_process_restart(smx_simcall_t simcall, smx_process_t process) {
 902   return SIMIX_process_restart(process, simcall->issuer);
 903 }
 904 /**
 905  * \brief Restart a process.
 906  * Restart a process, starting it again from the beginning.
 907  */
 908 smx_process_t SIMIX_process_restart(smx_process_t process, smx_process_t issuer) {
 909   XBT_DEBUG("Restarting process %s on %s", process->name, sg_host_name(process->smx_host));
 910   //retrieve the arguments of the old process
 911   //FIXME: Factorise this with SIMIX_host_add_auto_restart_process ?
 912   s_smx_process_arg_t arg;
 913   arg.code = process->code;
 914   arg.hostname = sg_host_name(process->smx_host);
 915   arg.kill_time = process->kill_time;
 916   arg.argc = process->argc;
 917   arg.data = process->data;
 918   int i;
 919   arg.argv = xbt_new(char*,process->argc + 1);
 920   for (i = 0; i < arg.argc; i++) {
 921     arg.argv[i] = xbt_strdup(process->argv[i]);
 922   }
 923   arg.argv[process->argc] = NULL;
 924   arg.properties = NULL;
 925   arg.auto_restart = process->auto_restart;
 926   //kill the old process
 927   SIMIX_process_kill(process,issuer);
 928   //start the new process
 929   smx_process_t new_process;
 930   if (simix_global->create_process_function) {
 931     simix_global->create_process_function(&new_process,
 932                                           arg.argv[0],
 933                                           arg.code,
 934                                           arg.data,
 935                                           arg.hostname,
 936                                           arg.kill_time,
 937                                           arg.argc,
 938                                           arg.argv,
 939                                           arg.properties,
 940                                           arg.auto_restart);
 941   }
 942   else {
 943     simcall_process_create(&new_process,
 944                                           arg.argv[0],
 945                                           arg.code,
 946                                           arg.data,
 947                                           arg.hostname,
 948                                           arg.kill_time,
 949                                           arg.argc,
 950                                           arg.argv,
 951                                           arg.properties,
 952                                           arg.auto_restart);
 953
 954   }
 955   return new_process;
 956 }