src/simix/smx_process.c

   1 /* Copyright (c) 2007-2013. 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     xbt_free(process->name);
 126     xbt_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     int i;
 243     XBT_WARN("Cannot launch process '%s' on failed host '%s'", name,
 244           hostname);
 245     for (i = 0; i < argc; i++)
 246       xbt_free(argv[i]);
 247     xbt_free(argv);
 248   }
 249   else {
 250     *process = xbt_new0(s_smx_process_t, 1);
 251
 252     xbt_assert(((code != NULL) && (host != NULL)), "Invalid parameters");
 253     /* Process data */
 254     (*process)->pid = simix_process_maxpid++;
 255     (*process)->name = xbt_strdup(name);
 256     (*process)->smx_host = host;
 257     (*process)->data = data;
 258     (*process)->comms = xbt_fifo_new();
 259     (*process)->simcall.issuer = *process;
 260
 261      if (SIMIX_process_self()) {
 262        (*process)->ppid = SIMIX_process_get_PID(SIMIX_process_self());
 263      } else {
 264        (*process)->ppid = -1;
 265      }
 266
 267     /* Process data for auto-restart */
 268     (*process)->auto_restart = auto_restart;
 269     (*process)->code = code;
 270     (*process)->argc = argc;
 271     (*process)->argv = argv;
 272     (*process)->kill_time = kill_time;
 273
 274
 275     XBT_VERB("Create context %s", (*process)->name);
 276     (*process)->context = SIMIX_context_new(code, argc, argv,
 277       simix_global->cleanup_process_function, *process);
 278
 279     (*process)->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 280     XBT_RUNNING_CTX_INITIALIZE((*process)->running_ctx);
 281
 282     if(MC_is_active()){
 283       MC_ignore_heap((*process)->running_ctx, sizeof(*(*process)->running_ctx));
 284     }
 285
 286     /* Add properties */
 287     (*process)->properties = properties;
 288
 289     /* Add the process to it's host process list */
 290     xbt_swag_insert(*process, SIMIX_host_priv(host)->process_list);
 291
 292     XBT_DEBUG("Start context '%s'", (*process)->name);
 293
 294     /* Now insert it in the global process list and in the process to run list */
 295     xbt_swag_insert(*process, simix_global->process_list);
 296     XBT_DEBUG("Inserting %s(%s) in the to_run list", (*process)->name, sg_host_name(host));
 297     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, *process);
 298   }
 299
 300   if (kill_time > SIMIX_get_clock()) {
 301     if (simix_global->kill_process_function) {
 302       XBT_DEBUG("Process %s(%s) will be kill at time %f", (*process)->name,
 303           sg_host_name((*process)->smx_host), kill_time);
 304       SIMIX_timer_set(kill_time, simix_global->kill_process_function, *process);
 305     }
 306   }
 307 }
 308
 309 /**
 310  * \brief Executes the processes from simix_global->process_to_run.
 311  *
 312  * The processes of simix_global->process_to_run are run (in parallel if
 313  * possible).  On exit, simix_global->process_to_run is empty, and
 314  * simix_global->process_that_ran contains the list of processes that just ran.
 315  * The two lists are swapped so, be careful when using them before and after a
 316  * call to this function.
 317  */
 318 void SIMIX_process_runall(void)
 319 {
 320   SIMIX_context_runall();
 321
 322   xbt_dynar_t tmp = simix_global->process_that_ran;
 323   simix_global->process_that_ran = simix_global->process_to_run;
 324   simix_global->process_to_run = tmp;
 325   xbt_dynar_reset(simix_global->process_to_run);
 326 }
 327
 328 void SIMIX_pre_process_kill(smx_simcall_t simcall, smx_process_t process) {
 329   SIMIX_process_kill(process, simcall->issuer);
 330 }
 331 /**
 332  * \brief Internal function to kill a SIMIX process.
 333  *
 334  * This function may be called when a SIMCALL_PROCESS_KILL simcall occurs,
 335  * or directly for SIMIX internal purposes.
 336  *
 337  * \param process poor victim
 338  * \param issuer the process which has sent the PROCESS_KILL. Important to not schedule twice the same process.
 339  */
 340 void SIMIX_process_kill(smx_process_t process, smx_process_t issuer) {
 341
 342   XBT_DEBUG("Killing process %s on %s", process->name, sg_host_name(process->smx_host));
 343
 344   process->context->iwannadie = 1;
 345   process->blocked = 0;
 346   process->suspended = 0;
 347   /* FIXME: set doexception to 0 also? */
 348
 349   /* destroy the blocking action if any */
 350   if (process->waiting_action) {
 351
 352     switch (process->waiting_action->type) {
 353
 354     case SIMIX_ACTION_EXECUTE:
 355     case SIMIX_ACTION_PARALLEL_EXECUTE:
 356       SIMIX_host_execution_destroy(process->waiting_action);
 357       break;
 358
 359     case SIMIX_ACTION_COMMUNICATE:
 360       xbt_fifo_remove(process->comms, process->waiting_action);
 361       SIMIX_comm_cancel(process->waiting_action);
 362       SIMIX_comm_destroy(process->waiting_action);
 363       break;
 364
 365     case SIMIX_ACTION_SLEEP:
 366       SIMIX_process_sleep_destroy(process->waiting_action);
 367       break;
 368
 369     case SIMIX_ACTION_SYNCHRO:
 370       SIMIX_synchro_stop_waiting(process, &process->simcall);
 371       SIMIX_synchro_destroy(process->waiting_action);
 372       break;
 373
 374     case SIMIX_ACTION_IO:
 375       SIMIX_io_destroy(process->waiting_action);
 376       break;
 377
 378       /* **************************************/
 379       /* TUTORIAL: New API                    */
 380     case SIMIX_ACTION_NEW_API:
 381       SIMIX_new_api_destroy(process->waiting_action);
 382       break;
 383       /* **************************************/
 384
 385     }
 386   }
 387   if(!xbt_dynar_member(simix_global->process_to_run, &(process)) && process != issuer) {
 388     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, process);
 389   }
 390
 391 }
 392
 393 void SIMIX_pre_process_killall(smx_simcall_t simcall, int reset_pid) {
 394   SIMIX_process_killall(simcall->issuer, reset_pid);
 395 }
 396 /**
 397  * \brief Kills all running processes.
 398  * \param issuer this one will not be killed
 399  */
 400 void SIMIX_process_killall(smx_process_t issuer, int reset_pid)
 401 {
 402   smx_process_t p = NULL;
 403
 404   while ((p = xbt_swag_extract(simix_global->process_list))) {
 405     if (p != issuer) {
 406       SIMIX_process_kill(p,issuer);
 407     }
 408   }
 409
 410   if (reset_pid > 0)
 411     simix_process_maxpid = reset_pid;
 412
 413   SIMIX_context_runall();
 414
 415   SIMIX_process_empty_trash();
 416 }
 417
 418 void SIMIX_pre_process_change_host(smx_simcall_t simcall, smx_process_t process,
 419                                    smx_host_t dest)
 420 {
 421   process->new_host = dest;
 422 }
 423 void SIMIX_process_change_host(smx_process_t process,
 424              smx_host_t dest)
 425 {
 426   xbt_assert((process != NULL), "Invalid parameters");
 427   xbt_swag_remove(process, SIMIX_host_priv(process->smx_host)->process_list);
 428   process->smx_host = dest;
 429   xbt_swag_insert(process, SIMIX_host_priv(dest)->process_list);
 430 }
 431
 432
 433 void SIMIX_pre_process_suspend(smx_simcall_t simcall, smx_process_t process)
 434 {
 435   smx_action_t action_suspend =
 436       SIMIX_process_suspend(process, simcall->issuer);
 437
 438   if (process != simcall->issuer) {
 439     SIMIX_simcall_answer(simcall);
 440   } else {
 441     xbt_fifo_push(action_suspend->simcalls, simcall);
 442     process->waiting_action = action_suspend;
 443     SIMIX_host_execution_suspend(process->waiting_action);
 444   }
 445   /* If we are suspending ourselves, then just do not finish the simcall now */
 446 }
 447
 448 smx_action_t SIMIX_process_suspend(smx_process_t process, smx_process_t issuer)
 449 {
 450   xbt_assert((process != NULL), "Invalid parameters");
 451
 452   if (process->suspended) {
 453     XBT_DEBUG("Process '%s' is already suspended", process->name);
 454     return NULL;
 455   }
 456
 457   process->suspended = 1;
 458
 459   /* If we are suspending another process, and it is waiting on an action,
 460      suspend its action. */
 461   if (process != issuer) {
 462
 463     if (process->waiting_action) {
 464
 465       switch (process->waiting_action->type) {
 466
 467         case SIMIX_ACTION_EXECUTE:
 468         case SIMIX_ACTION_PARALLEL_EXECUTE:
 469           SIMIX_host_execution_suspend(process->waiting_action);
 470           break;
 471
 472         case SIMIX_ACTION_COMMUNICATE:
 473           SIMIX_comm_suspend(process->waiting_action);
 474           break;
 475
 476         case SIMIX_ACTION_SLEEP:
 477           SIMIX_process_sleep_suspend(process->waiting_action);
 478           break;
 479
 480         case SIMIX_ACTION_SYNCHRO:
 481           /* Suspension is delayed to when the process is rescheduled. */
 482           break;
 483
 484         default:
 485           xbt_die("Internal error in SIMIX_process_suspend: unexpected action type %d",
 486               (int)process->waiting_action->type);
 487       }
 488       return NULL;
 489     } else {
 490       /* Suspension is delayed to when the process is rescheduled. */
 491       return NULL;
 492     }
 493   } else {
 494     return SIMIX_host_execute("suspend", process->smx_host, 0.0, 1.0);
 495   }
 496 }
 497
 498 void SIMIX_pre_process_resume(smx_simcall_t simcall, smx_process_t process){
 499   SIMIX_process_resume(process, simcall->issuer);
 500 }
 501
 502 void SIMIX_process_resume(smx_process_t process, smx_process_t issuer)
 503 {
 504   xbt_assert((process != NULL), "Invalid parameters");
 505
 506   XBT_IN("process = %p, issuer = %p", process, issuer);
 507
 508   if(process->context->iwannadie) {
 509     XBT_VERB("Ignoring request to suspend a process that is currently dying.");
 510     return;
 511   }
 512
 513   if(!process->suspended) return;
 514   process->suspended = 0;
 515
 516   /* If we are resuming another process, resume the action it was waiting for
 517      if any. Otherwise add it to the list of process to run in the next round. */
 518   if (process != issuer) {
 519
 520     if (process->waiting_action) {
 521
 522       switch (process->waiting_action->type) {
 523
 524         case SIMIX_ACTION_EXECUTE:
 525         case SIMIX_ACTION_PARALLEL_EXECUTE:
 526           SIMIX_host_execution_resume(process->waiting_action);
 527           break;
 528
 529         case SIMIX_ACTION_COMMUNICATE:
 530           SIMIX_comm_resume(process->waiting_action);
 531           break;
 532
 533         case SIMIX_ACTION_SLEEP:
 534           SIMIX_process_sleep_resume(process->waiting_action);
 535           break;
 536
 537         case SIMIX_ACTION_SYNCHRO:
 538           /* I cannot resume it now. This is delayed to when the process is rescheduled at
 539            * the end of the synchro. */
 540           break;
 541
 542         default:
 543           xbt_die("Internal error in SIMIX_process_resume: unexpected action type %d",
 544               (int)process->waiting_action->type);
 545       }
 546     }
 547   } else XBT_WARN("Strange. Process %p is trying to resume himself.", issuer);
 548
 549   XBT_OUT();
 550 }
 551
 552 int SIMIX_process_get_maxpid(void) {
 553   return simix_process_maxpid;
 554 }
 555
 556 int SIMIX_pre_process_count(smx_simcall_t simcall){
 557   return SIMIX_process_count();
 558 }
 559 int SIMIX_process_count(void)
 560 {
 561   return xbt_swag_size(simix_global->process_list);
 562 }
 563
 564 int SIMIX_pre_process_get_PID(smx_simcall_t simcall, smx_process_t self){
 565    return SIMIX_process_get_PID(self);
 566 }
 567
 568 int SIMIX_process_get_PID(smx_process_t self){
 569   if (self == NULL)
 570     return 0;
 571   else
 572     return self->pid;
 573 }
 574
 575 int SIMIX_pre_process_get_PPID(smx_simcall_t simcall, smx_process_t self){
 576   return SIMIX_process_get_PPID(self);
 577 }
 578
 579 int SIMIX_process_get_PPID(smx_process_t self){
 580   if (self == NULL)
 581     return 0;
 582   else
 583     return self->ppid;
 584 }
 585
 586 void* SIMIX_pre_process_self_get_data(smx_simcall_t simcall, smx_process_t self){
 587   return SIMIX_process_self_get_data(self);
 588 }
 589
 590 void* SIMIX_process_self_get_data(smx_process_t self)
 591 {
 592   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 593
 594   if (!self) {
 595     return NULL;
 596   }
 597   return SIMIX_process_get_data(self);
 598 }
 599
 600 void SIMIX_pre_process_set_data(smx_simcall_t simcall, smx_process_t process,
 601                                 void *data){
 602   SIMIX_process_set_data(process, data);
 603 }
 604 void SIMIX_process_self_set_data(smx_process_t self, void *data)
 605 {
 606   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 607
 608   SIMIX_process_set_data(self, data);
 609 }
 610
 611 void* SIMIX_pre_process_get_data(smx_simcall_t simcall, smx_process_t process){
 612   return SIMIX_process_get_data(process);
 613 }
 614 void* SIMIX_process_get_data(smx_process_t process)
 615 {
 616   return process->data;
 617 }
 618
 619 void SIMIX_process_set_data(smx_process_t process, void *data)
 620 {
 621   process->data = data;
 622 }
 623
 624 smx_host_t SIMIX_pre_process_get_host(smx_simcall_t simcall, smx_process_t process){
 625   return SIMIX_process_get_host(process);
 626 }
 627 smx_host_t SIMIX_process_get_host(smx_process_t process)
 628 {
 629   return process->smx_host;
 630 }
 631
 632 /* needs to be public and without simcall because it is called
 633    by exceptions and logging events */
 634 const char* SIMIX_process_self_get_name(void) {
 635
 636   smx_process_t process = SIMIX_process_self();
 637   if (process == NULL || process == simix_global->maestro_process)
 638     return "";
 639
 640   return SIMIX_process_get_name(process);
 641 }
 642
 643 const char* SIMIX_pre_process_get_name(smx_simcall_t simcall, smx_process_t process) {
 644   return SIMIX_process_get_name(process);
 645 }
 646 const char* SIMIX_process_get_name(smx_process_t process)
 647 {
 648   return process->name;
 649 }
 650
 651 smx_process_t SIMIX_process_get_by_name(const char* name)
 652 {
 653   smx_process_t proc;
 654
 655   xbt_swag_foreach(proc, simix_global->process_list)
 656   {
 657     if(!strcmp(name, proc->name))
 658       return proc;
 659   }
 660   return NULL;
 661 }
 662
 663 int SIMIX_pre_process_is_suspended(smx_simcall_t simcall, smx_process_t process){
 664   return SIMIX_process_is_suspended(process);
 665 }
 666 int SIMIX_process_is_suspended(smx_process_t process)
 667 {
 668   return process->suspended;
 669 }
 670
 671 xbt_dict_t SIMIX_pre_process_get_properties(smx_simcall_t simcall, smx_process_t process){
 672   return SIMIX_process_get_properties(process);
 673 }
 674 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
 675 {
 676   return process->properties;
 677 }
 678
 679 void SIMIX_pre_process_sleep(smx_simcall_t simcall, double duration)
 680 {
 681   if (MC_is_active()) {
 682     MC_process_clock_add(simcall->issuer, duration);
 683     simcall_process_sleep__set__result(simcall, SIMIX_DONE);
 684     SIMIX_simcall_answer(simcall);
 685     return;
 686   }
 687   smx_action_t action = SIMIX_process_sleep(simcall->issuer, duration);
 688   xbt_fifo_push(action->simcalls, simcall);
 689   simcall->issuer->waiting_action = action;
 690 }
 691
 692 smx_action_t SIMIX_process_sleep(smx_process_t process, double duration)
 693 {
 694   smx_action_t action;
 695   smx_host_t host = process->smx_host;
 696
 697   /* check if the host is active */
 698   if (surf_resource_get_state(surf_workstation_resource_priv(host)) != SURF_RESOURCE_ON) {
 699     THROWF(host_error, 0, "Host %s failed, you cannot call this function",
 700            sg_host_name(host));
 701   }
 702
 703   action = xbt_mallocator_get(simix_global->action_mallocator);
 704   action->type = SIMIX_ACTION_SLEEP;
 705   action->name = NULL;
 706 #ifdef HAVE_TRACING
 707   action->category = NULL;
 708 #endif
 709
 710   action->sleep.host = host;
 711   action->sleep.surf_sleep =
 712       surf_workstation_sleep(host, duration);
 713
 714   surf_action_set_data(action->sleep.surf_sleep, action);
 715   XBT_DEBUG("Create sleep action %p", action);
 716
 717   return action;
 718 }
 719
 720 void SIMIX_post_process_sleep(smx_action_t action)
 721 {
 722   smx_simcall_t simcall;
 723   e_smx_state_t state;
 724
 725   while ((simcall = xbt_fifo_shift(action->simcalls))) {
 726
 727     switch(surf_action_get_state(action->sleep.surf_sleep)){
 728       case SURF_ACTION_FAILED:
 729         simcall->issuer->context->iwannadie = 1;
 730         //SMX_EXCEPTION(simcall->issuer, host_error, 0, "Host failed");
 731         state = SIMIX_SRC_HOST_FAILURE;
 732         break;
 733
 734       case SURF_ACTION_DONE:
 735         state = SIMIX_DONE;
 736         break;
 737
 738       default:
 739         THROW_IMPOSSIBLE;
 740         break;
 741     }
 742     if (surf_resource_get_state(surf_workstation_resource_priv(simcall->issuer->smx_host)) != SURF_RESOURCE_ON) {
 743       simcall->issuer->context->iwannadie = 1;
 744     }
 745     simcall_process_sleep__set__result(simcall, state);
 746     simcall->issuer->waiting_action = NULL;
 747     SIMIX_simcall_answer(simcall);
 748
 749   }
 750   SIMIX_process_sleep_destroy(action);
 751 }
 752
 753 void SIMIX_process_sleep_destroy(smx_action_t action)
 754 {
 755   XBT_DEBUG("Destroy action %p", action);
 756   if (action->sleep.surf_sleep)
 757     surf_action_unref(action->sleep.surf_sleep);
 758   xbt_mallocator_release(simix_global->action_mallocator, action);
 759 }
 760
 761 void SIMIX_process_sleep_suspend(smx_action_t action)
 762 {
 763   surf_action_suspend(action->sleep.surf_sleep);
 764 }
 765
 766 void SIMIX_process_sleep_resume(smx_action_t action)
 767 {
 768   surf_action_resume(action->sleep.surf_sleep);
 769 }
 770
 771 /**
 772  * \brief Calling this function makes the process to yield.
 773  *
 774  * Only the current process can call this function, giving back the control to
 775  * maestro.
 776  *
 777  * \param self the current process
 778  */
 779 void SIMIX_process_yield(smx_process_t self)
 780 {
 781   XBT_DEBUG("Yield process '%s'", self->name);
 782
 783   /* Go into sleep and return control to maestro */
 784   SIMIX_context_suspend(self->context);
 785
 786   /* Ok, maestro returned control to us */
 787   XBT_DEBUG("Control returned to me: '%s'", self->name);
 788
 789   if (self->new_host) {
 790     SIMIX_process_change_host(self, self->new_host);
 791     self->new_host = NULL;
 792   }
 793
 794   if (self->context->iwannadie){
 795     XBT_DEBUG("I wanna die!");
 796     SIMIX_process_stop(self);
 797   }
 798
 799   if(self->suspended) {
 800     xbt_assert(!self->doexception, "Gloups! This exception may be lost by subsequent calls.");
 801     self->suspended = 0;
 802     SIMIX_process_suspend(self,self);
 803   }
 804
 805   if (self->doexception) {
 806     XBT_DEBUG("Wait, maestro left me an exception");
 807     self->doexception = 0;
 808     SMX_THROW();
 809   }
 810
 811 }
 812
 813 /* callback: context fetching */
 814 xbt_running_ctx_t *SIMIX_process_get_running_context(void)
 815 {
 816   return SIMIX_process_self()->running_ctx;
 817 }
 818
 819 /* callback: termination */
 820 void SIMIX_process_exception_terminate(xbt_ex_t * e)
 821 {
 822   xbt_ex_display(e);
 823   xbt_abort();
 824 }
 825
 826 smx_context_t SIMIX_process_get_context(smx_process_t p) {
 827   return p->context;
 828 }
 829
 830 void SIMIX_process_set_context(smx_process_t p,smx_context_t c) {
 831   p->context = c;
 832 }
 833
 834 /**
 835  * \brief Returns the list of processes to run.
 836  */
 837 xbt_dynar_t SIMIX_process_get_runnable(void)
 838 {
 839   return simix_global->process_to_run;
 840 }
 841
 842 /**
 843  * \brief Returns the process from PID.
 844  */
 845 smx_process_t SIMIX_process_from_PID(int PID)
 846 {
 847   smx_process_t proc;
 848   xbt_swag_foreach(proc, simix_global->process_list)
 849   {
 850    if(proc->pid == PID)
 851    return proc;
 852   }
 853   return NULL;
 854 }
 855
 856 /** @brief returns a dynar containg all currently existing processes */
 857 xbt_dynar_t SIMIX_processes_as_dynar(void) {
 858   smx_process_t proc;
 859   xbt_dynar_t res = xbt_dynar_new(sizeof(smx_process_t),NULL);
 860   xbt_swag_foreach(proc, simix_global->process_list) {
 861     xbt_dynar_push(res,&proc);
 862   }
 863   return res;
 864 }
 865
 866
 867 void SIMIX_process_on_exit_runall(smx_process_t process) {
 868   s_smx_process_exit_fun_t exit_fun;
 869
 870   while (!xbt_dynar_is_empty(process->on_exit)) {
 871     exit_fun = xbt_dynar_pop_as(process->on_exit,s_smx_process_exit_fun_t);
 872     (exit_fun.fun)(exit_fun.arg);
 873   }
 874 }
 875
 876 void SIMIX_pre_process_on_exit(smx_simcall_t simcall, smx_process_t process,
 877                                int_f_pvoid_t fun, void *data) {
 878   SIMIX_process_on_exit(process, fun, data);
 879 }
 880
 881 void SIMIX_process_on_exit(smx_process_t process, int_f_pvoid_t fun, void *data) {
 882   xbt_assert(process, "current process not found: are you in maestro context ?");
 883
 884   if (!process->on_exit) {
 885     process->on_exit = xbt_dynar_new(sizeof(s_smx_process_exit_fun_t), NULL);
 886   }
 887
 888   s_smx_process_exit_fun_t exit_fun = {fun, data};
 889
 890   xbt_dynar_push_as(process->on_exit,s_smx_process_exit_fun_t,exit_fun);
 891 }
 892
 893 void SIMIX_pre_process_auto_restart_set(smx_simcall_t simcall, smx_process_t process,
 894                                         int auto_restart) {
 895   SIMIX_process_auto_restart_set(process, auto_restart);
 896 }
 897 /**
 898  * \brief Sets the auto-restart status of the process.
 899  * If set to 1, the process will be automatically restarted when its host
 900  * comes back.
 901  */
 902 void SIMIX_process_auto_restart_set(smx_process_t process, int auto_restart) {
 903   process->auto_restart = auto_restart;
 904 }
 905
 906 smx_process_t SIMIX_pre_process_restart(smx_simcall_t simcall, smx_process_t process) {
 907   return SIMIX_process_restart(process, simcall->issuer);
 908 }
 909 /**
 910  * \brief Restart a process.
 911  * Restart a process, starting it again from the beginning.
 912  */
 913 smx_process_t SIMIX_process_restart(smx_process_t process, smx_process_t issuer) {
 914   XBT_DEBUG("Restarting process %s on %s", process->name, sg_host_name(process->smx_host));
 915   //retrieve the arguments of the old process
 916   //FIXME: Factorise this with SIMIX_host_add_auto_restart_process ?
 917   s_smx_process_arg_t arg;
 918   arg.code = process->code;
 919   arg.hostname = sg_host_name(process->smx_host);
 920   arg.kill_time = process->kill_time;
 921   arg.argc = process->argc;
 922   arg.data = process->data;
 923   int i;
 924   arg.argv = xbt_new(char*,process->argc + 1);
 925   for (i = 0; i < arg.argc; i++) {
 926     arg.argv[i] = xbt_strdup(process->argv[i]);
 927   }
 928   arg.argv[process->argc] = NULL;
 929   arg.properties = NULL;
 930   arg.auto_restart = process->auto_restart;
 931   //kill the old process
 932   SIMIX_process_kill(process,issuer);
 933   //start the new process
 934   smx_process_t new_process;
 935   if (simix_global->create_process_function) {
 936     simix_global->create_process_function(&new_process,
 937                                           arg.argv[0],
 938                                           arg.code,
 939                                           arg.data,
 940                                           arg.hostname,
 941                                           arg.kill_time,
 942                                           arg.argc,
 943                                           arg.argv,
 944                                           arg.properties,
 945                                           arg.auto_restart);
 946   }
 947   else {
 948     simcall_process_create(&new_process,
 949                                           arg.argv[0],
 950                                           arg.code,
 951                                           arg.data,
 952                                           arg.hostname,
 953                                           arg.kill_time,
 954                                           arg.argc,
 955                                           arg.argv,
 956                                           arg.properties,
 957                                           arg.auto_restart);
 958
 959   }
 960   return new_process;
 961 }