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