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