src/simix/smx_process.c

   1 /* Copyright (c) 2007-2012. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   4 /* This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the license (GNU LGPL) which comes with this package. */
   6
   7 #include "smx_private.h"
   8 #include "xbt/sysdep.h"
   9 #include "xbt/log.h"
  10 #include "xbt/dict.h"
  11 #include "mc/mc.h"
  12
  13 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_process, simix,
  14                                 "Logging specific to SIMIX (process)");
  15
  16 unsigned long simix_process_maxpid = 0;
  17
  18 /**
  19  * \brief Returns the current agent.
  20  *
  21  * This functions returns the currently running SIMIX process.
  22  *
  23  * \return The SIMIX process
  24  */
  25 XBT_INLINE smx_process_t SIMIX_process_self(void)
  26 {
  27   smx_context_t self_context = SIMIX_context_self();
  28
  29   return self_context ? SIMIX_context_get_data(self_context) : NULL;
  30 }
  31
  32 /**
  33  * \brief Returns whether a process has pending asynchronous communications.
  34  * \return true if there are asynchronous communications in this process
  35  */
  36 int SIMIX_process_has_pending_comms(smx_process_t process) {
  37
  38   return xbt_fifo_size(process->comms) > 0;
  39 }
  40
  41 void SIMIX_pre_process_cleanup(smx_simcall_t simcall, smx_process_t process) {
  42   SIMIX_process_cleanup(process);
  43 }
  44 /**
  45  * \brief Moves a process to the list of processes to destroy.
  46  */
  47 void SIMIX_process_cleanup(smx_process_t process)
  48 {
  49   XBT_DEBUG("Cleanup process %s (%p), waiting action %p",
  50       process->name, process, process->waiting_action);
  51
  52   /* cancel non-blocking communications */
  53   smx_action_t action;
  54   while ((action = xbt_fifo_pop(process->comms))) {
  55
  56     /* make sure no one will finish the comm after this process is destroyed,
  57      * because src_proc or dst_proc would be an invalid pointer */
  58     SIMIX_comm_cancel(action);
  59
  60     if (action->comm.src_proc == process) {
  61       XBT_DEBUG("Found an unfinished send comm %p (detached = %d), state %d, src = %p, dst = %p",
  62           action, action->comm.detached, (int)action->state, action->comm.src_proc, action->comm.dst_proc);
  63       action->comm.src_proc = NULL;
  64
  65       if (action->comm.detached) {
  66          if (action->comm.refcount == 0) {
  67            XBT_DEBUG("Increase the refcount before destroying it since it's detached");
  68            /* I'm not supposed to destroy a detached comm from the sender side,
  69             * unless there is no receiver matching the rdv */
  70            action->comm.refcount++;
  71            SIMIX_comm_destroy(action);
  72          }
  73          else {
  74            XBT_DEBUG("Don't destroy it since its refcount is %d", action->comm.refcount);
  75          }
  76       } else {
  77         SIMIX_comm_destroy(action);
  78       }
  79     }
  80     else if (action->comm.dst_proc == process){
  81       XBT_DEBUG("Found an unfinished recv comm %p, state %d, src = %p, dst = %p",
  82           action, (int)action->state, action->comm.src_proc, action->comm.dst_proc);
  83       action->comm.dst_proc = NULL;
  84
  85       if (action->comm.detached && action->comm.refcount == 1
  86           && action->comm.src_proc != NULL) {
  87         /* the comm will be freed right now, remove it from the sender */
  88         xbt_fifo_remove(action->comm.src_proc->comms, action);
  89       }
  90       SIMIX_comm_destroy(action);
  91     }
  92     else {
  93       xbt_die("Communication action %p is in my list but I'm not the sender "
  94           "or the receiver", action);
  95     }
  96   }
  97
  98   /*xbt_swag_remove(process, simix_global->process_to_run);*/
  99   xbt_swag_remove(process, simix_global->process_list);
 100   xbt_swag_remove(process, SIMIX_host_priv(process->smx_host)->process_list);
 101   xbt_swag_insert(process, simix_global->process_to_destroy);
 102   process->context->iwannadie = 0;
 103 }
 104
 105 /**
 106  * Garbage collection
 107  *
 108  * Should be called some time to time to free the memory allocated for processes
 109  * that have finished (or killed).
 110  */
 111 void SIMIX_process_empty_trash(void)
 112 {
 113   smx_process_t process = NULL;
 114
 115   while ((process = xbt_swag_extract(simix_global->process_to_destroy))) {
 116     SIMIX_context_free(process->context);
 117
 118     /* Free the exception allocated at creation time */
 119     free(process->running_ctx);
 120     xbt_dict_free(&process->properties);
 121
 122     xbt_fifo_free(process->comms);
 123
 124     xbt_dynar_free(&process->on_exit);
 125
 126     free(process->name);
 127     free(process);
 128   }
 129 }
 130
 131 /**
 132  * \brief Creates and runs the maestro process
 133  */
 134 void SIMIX_create_maestro_process()
 135 {
 136   smx_process_t maestro = NULL;
 137
 138   /* Create maestro process and intilialize it */
 139   maestro = xbt_new0(s_smx_process_t, 1);
 140   maestro->pid = simix_process_maxpid++;
 141   maestro->name = (char *) "";
 142   maestro->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 143   XBT_RUNNING_CTX_INITIALIZE(maestro->running_ctx);
 144   maestro->context = SIMIX_context_new(NULL, 0, NULL, NULL, maestro);
 145   maestro->simcall.issuer = maestro;
 146
 147   simix_global->maestro_process = maestro;
 148   return;
 149 }
 150 /**
 151  * \brief Stops a process.
 152  *
 153  * Stops the process, execute all the registered on_exit functions,
 154  * register it to the list of the process to restart if needed
 155  * and stops its context.
 156  */
 157 void SIMIX_process_stop(smx_process_t arg) {
 158   /* execute the on_exit functions */
 159   SIMIX_process_on_exit_runall(arg);
 160   /* Add the process to the list of process to restart, only if
 161    * the host is down
 162    */
 163   if (arg->auto_restart && !SIMIX_host_get_state(arg->smx_host)) {
 164     SIMIX_host_add_auto_restart_process(arg->smx_host,arg->name,arg->code, arg->data,
 165                                         sg_host_name(arg->smx_host),
 166                                         arg->kill_time,
 167                                         arg->argc,arg->argv,arg->properties,
 168                                         arg->auto_restart);
 169   }
 170   XBT_DEBUG("Process %s (%s) is dead",arg->name,sg_host_name(arg->smx_host));
 171   /* stop the context */
 172   SIMIX_context_stop(arg->context);
 173 }
 174
 175 /**
 176  * \brief Same as SIMIX_process_create() but with only one argument (used by timers).
 177  * This function frees the argument.
 178  * \return the process created
 179  */
 180 smx_process_t SIMIX_process_create_from_wrapper(smx_process_arg_t args) {
 181
 182   smx_process_t process;
 183   simix_global->create_process_function(
 184       &process,
 185       args->name,
 186       args->code,
 187       args->data,
 188       args->hostname,
 189       args->kill_time,
 190       args->argc,
 191       args->argv,
 192       args->properties,
 193       args->auto_restart);
 194   xbt_free(args);
 195   return process;
 196 }
 197
 198
 199 void SIMIX_pre_process_create(smx_simcall_t simcall,
 200                           smx_process_t *process,
 201                           const char *name,
 202                           xbt_main_func_t code,
 203                           void *data,
 204                           const char *hostname,
 205                           double kill_time,
 206                           int argc, char **argv,
 207                           xbt_dict_t properties,
 208                           int auto_restart){
 209   return SIMIX_process_create(process, name, code, data, hostname,
 210                               kill_time, argc, argv, properties, auto_restart);
 211 }
 212 /**
 213  * \brief Internal function to create a process.
 214  *
 215  * This function actually creates the process.
 216  * It may be called when a SIMCALL_PROCESS_CREATE simcall occurs,
 217  * or directly for SIMIX internal purposes. The sure thing is that it's called from maestro context.
 218  *
 219  * \return the process created
 220  */
 221 void SIMIX_process_create(smx_process_t *process,
 222                           const char *name,
 223                           xbt_main_func_t code,
 224                           void *data,
 225                           const char *hostname,
 226                           double kill_time,
 227                           int argc, char **argv,
 228                           xbt_dict_t properties,
 229                           int auto_restart) {
 230
 231   *process = NULL;
 232   smx_host_t host = SIMIX_host_get_by_name(hostname);
 233
 234   XBT_DEBUG("Start process %s on host '%s'", name, hostname);
 235
 236   if (!SIMIX_host_get_state(host)) {
 237     XBT_WARN("Cannot launch process '%s' on failed host '%s'", name,
 238           hostname);
 239   }
 240   else {
 241     *process = xbt_new0(s_smx_process_t, 1);
 242
 243     xbt_assert(((code != NULL) && (host != NULL)), "Invalid parameters");
 244     /* Process data */
 245     (*process)->pid = simix_process_maxpid++;
 246     (*process)->name = xbt_strdup(name);
 247     (*process)->smx_host = host;
 248     (*process)->data = data;
 249     (*process)->comms = xbt_fifo_new();
 250     (*process)->simcall.issuer = *process;
 251
 252     /* Process data for auto-restart */
 253     (*process)->auto_restart = auto_restart;
 254     (*process)->code = code;
 255     (*process)->argc = argc;
 256     (*process)->argv = argv;
 257     (*process)->kill_time = kill_time;
 258
 259
 260     XBT_VERB("Create context %s", (*process)->name);
 261     (*process)->context = SIMIX_context_new(code, argc, argv,
 262       simix_global->cleanup_process_function, *process);
 263
 264     (*process)->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 265     XBT_RUNNING_CTX_INITIALIZE((*process)->running_ctx);
 266
 267     /* Add properties */
 268     (*process)->properties = properties;
 269
 270     /* Add the process to it's host process list */
 271     xbt_swag_insert(*process, SIMIX_host_priv(host)->process_list);
 272
 273     XBT_DEBUG("Start context '%s'", (*process)->name);
 274
 275     /* Now insert it in the global process list and in the process to run list */
 276     xbt_swag_insert(*process, simix_global->process_list);
 277     XBT_DEBUG("Inserting %s(%s) in the to_run list", (*process)->name, sg_host_name(host));
 278     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, *process);
 279   }
 280
 281   if (kill_time > SIMIX_get_clock()) {
 282     if (simix_global->kill_process_function) {
 283       XBT_DEBUG("Process %s(%s) will be kill at time %f", (*process)->name,
 284           sg_host_name((*process)->smx_host), kill_time);
 285       SIMIX_timer_set(kill_time, simix_global->kill_process_function, *process);
 286     }
 287   }
 288 }
 289
 290 /**
 291  * \brief Executes the processes from simix_global->process_to_run.
 292  *
 293  * The processes of simix_global->process_to_run are run (in parallel if
 294  * possible).  On exit, simix_global->process_to_run is empty, and
 295  * simix_global->process_that_ran contains the list of processes that just ran.
 296  * The two lists are swapped so, be careful when using them before and after a
 297  * call to this function.
 298  */
 299 void SIMIX_process_runall(void)
 300 {
 301   SIMIX_context_runall();
 302
 303   xbt_dynar_t tmp = simix_global->process_that_ran;
 304   simix_global->process_that_ran = simix_global->process_to_run;
 305   simix_global->process_to_run = tmp;
 306   xbt_dynar_reset(simix_global->process_to_run);
 307 }
 308
 309 void SIMIX_pre_process_kill(smx_simcall_t simcall, smx_process_t process) {
 310   SIMIX_process_kill(process, simcall->issuer);
 311 }
 312 /**
 313  * \brief Internal function to kill a SIMIX process.
 314  *
 315  * This function may be called when a SIMCALL_PROCESS_KILL simcall occurs,
 316  * or directly for SIMIX internal purposes.
 317  *
 318  * \param process poor victim
 319  * \param issuer the process which has sent the PROCESS_KILL. Important to not schedule twice the same process.
 320  */
 321 void SIMIX_process_kill(smx_process_t process, smx_process_t issuer) {
 322
 323   XBT_DEBUG("Killing process %s on %s", process->name, sg_host_name(process->smx_host));
 324
 325   process->context->iwannadie = 1;
 326   process->blocked = 0;
 327   process->suspended = 0;
 328   /* FIXME: set doexception to 0 also? */
 329
 330   /* destroy the blocking action if any */
 331   if (process->waiting_action) {
 332
 333     switch (process->waiting_action->type) {
 334
 335       case SIMIX_ACTION_EXECUTE:
 336       case SIMIX_ACTION_PARALLEL_EXECUTE:
 337         SIMIX_host_execution_destroy(process->waiting_action);
 338         break;
 339
 340       case SIMIX_ACTION_COMMUNICATE:
 341         xbt_fifo_remove(process->comms, process->waiting_action);
 342         SIMIX_comm_cancel(process->waiting_action);
 343         break;
 344
 345         case SIMIX_ACTION_SLEEP:
 346           SIMIX_process_sleep_destroy(process->waiting_action);
 347           break;
 348
 349         case SIMIX_ACTION_SYNCHRO:
 350           SIMIX_synchro_stop_waiting(process, &process->simcall);
 351           SIMIX_synchro_destroy(process->waiting_action);
 352           break;
 353
 354         case SIMIX_ACTION_IO:
 355           SIMIX_io_destroy(process->waiting_action);
 356           break;
 357
 358         /* **************************************/
 359         /* TUTORIAL: New API                    */
 360         case SIMIX_ACTION_NEW_API:
 361           SIMIX_new_api_destroy(process->waiting_action);
 362           break;
 363         /* **************************************/
 364
 365     }
 366   }
 367   if(!xbt_dynar_member(simix_global->process_to_run, &(process)) && process != issuer) {
 368     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, process);
 369   }
 370
 371 }
 372
 373 void SIMIX_pre_process_killall(smx_simcall_t simcall) {
 374   SIMIX_process_killall(simcall->issuer);
 375 }
 376 /**
 377  * \brief Kills all running processes.
 378  * \param issuer this one will not be killed
 379  */
 380 void SIMIX_process_killall(smx_process_t issuer)
 381 {
 382   smx_process_t p = NULL;
 383
 384   while ((p = xbt_swag_extract(simix_global->process_list))) {
 385     if (p != issuer) {
 386       SIMIX_process_kill(p,issuer);
 387     }
 388   }
 389
 390   SIMIX_context_runall();
 391
 392   SIMIX_process_empty_trash();
 393 }
 394
 395 void SIMIX_pre_process_change_host(smx_simcall_t simcall, smx_process_t process,
 396                                    smx_host_t dest)
 397 {
 398   process->new_host = dest;
 399 }
 400 void SIMIX_process_change_host(smx_process_t process,
 401              smx_host_t dest)
 402 {
 403   xbt_assert((process != NULL), "Invalid parameters");
 404   xbt_swag_remove(process, SIMIX_host_priv(process->smx_host)->process_list);
 405   process->smx_host = dest;
 406   xbt_swag_insert(process, SIMIX_host_priv(dest)->process_list);
 407 }
 408
 409
 410 void SIMIX_pre_process_suspend(smx_simcall_t simcall, smx_process_t process)
 411 {
 412   smx_action_t action_suspend =
 413       SIMIX_process_suspend(process, simcall->issuer);
 414
 415   if (process != simcall->issuer) {
 416     SIMIX_simcall_answer(simcall);
 417   } else {
 418     xbt_fifo_push(action_suspend->simcalls, simcall);
 419     process->waiting_action = action_suspend;
 420     SIMIX_host_execution_suspend(process->waiting_action);
 421   }
 422   /* If we are suspending ourselves, then just do not finish the simcall now */
 423 }
 424
 425 smx_action_t SIMIX_process_suspend(smx_process_t process, smx_process_t issuer)
 426 {
 427   xbt_assert((process != NULL), "Invalid parameters");
 428
 429   if (process->suspended) {
 430     XBT_DEBUG("Process '%s' is already suspended", process->name);
 431     return NULL;
 432   }
 433
 434   process->suspended = 1;
 435
 436   /* If we are suspending another process, and it is waiting on an action,
 437      suspend its action. */
 438   if (process != issuer) {
 439
 440     if (process->waiting_action) {
 441
 442       switch (process->waiting_action->type) {
 443
 444         case SIMIX_ACTION_EXECUTE:
 445         case SIMIX_ACTION_PARALLEL_EXECUTE:
 446           SIMIX_host_execution_suspend(process->waiting_action);
 447           break;
 448
 449         case SIMIX_ACTION_COMMUNICATE:
 450           SIMIX_comm_suspend(process->waiting_action);
 451           break;
 452
 453         case SIMIX_ACTION_SLEEP:
 454           SIMIX_process_sleep_suspend(process->waiting_action);
 455           break;
 456
 457         case SIMIX_ACTION_SYNCHRO:
 458           /* Suspension is delayed to when the process is rescheduled. */
 459           break;
 460
 461         default:
 462           xbt_die("Internal error in SIMIX_process_suspend: unexpected action type %d",
 463               (int)process->waiting_action->type);
 464       }
 465       return NULL;
 466     } else {
 467       /* Suspension is delayed to when the process is rescheduled. */
 468       return NULL;
 469     }
 470   } else {
 471     return SIMIX_host_execute("suspend", process->smx_host, 0.0, 1.0);
 472   }
 473 }
 474
 475 void SIMIX_pre_process_resume(smx_simcall_t simcall, smx_process_t process){
 476   SIMIX_process_resume(process, simcall->issuer);
 477 }
 478
 479 void SIMIX_process_resume(smx_process_t process, smx_process_t issuer)
 480 {
 481   xbt_assert((process != NULL), "Invalid parameters");
 482
 483   XBT_IN("process = %p, issuer = %p", process, issuer);
 484
 485   if(process->context->iwannadie) {
 486     XBT_VERB("Ignoring request to suspend a process that is currently dying.");
 487     return;
 488   }
 489
 490   if(!process->suspended) return;
 491   process->suspended = 0;
 492
 493   /* If we are resuming another process, resume the action it was waiting for
 494      if any. Otherwise add it to the list of process to run in the next round. */
 495   if (process != issuer) {
 496
 497     if (process->waiting_action) {
 498
 499       switch (process->waiting_action->type) {
 500
 501         case SIMIX_ACTION_EXECUTE:
 502         case SIMIX_ACTION_PARALLEL_EXECUTE:
 503           SIMIX_host_execution_resume(process->waiting_action);
 504           break;
 505
 506         case SIMIX_ACTION_COMMUNICATE:
 507           SIMIX_comm_resume(process->waiting_action);
 508           break;
 509
 510         case SIMIX_ACTION_SLEEP:
 511           SIMIX_process_sleep_resume(process->waiting_action);
 512           break;
 513
 514         case SIMIX_ACTION_SYNCHRO:
 515           /* I cannot resume it now. This is delayed to when the process is rescheduled at
 516            * the end of the synchro. */
 517           break;
 518
 519         default:
 520           xbt_die("Internal error in SIMIX_process_resume: unexpected action type %d",
 521               (int)process->waiting_action->type);
 522       }
 523     }
 524   } else XBT_WARN("Strange. Process %p is trying to resume himself.", issuer);
 525
 526   XBT_OUT();
 527 }
 528
 529 int SIMIX_process_get_maxpid(void) {
 530   return simix_process_maxpid;
 531 }
 532
 533 int SIMIX_pre_process_count(smx_simcall_t simcall){
 534   return SIMIX_process_count();
 535 }
 536 int SIMIX_process_count(void)
 537 {
 538   return xbt_swag_size(simix_global->process_list);
 539 }
 540
 541 void* SIMIX_pre_process_self_get_data(smx_simcall_t simcall, smx_process_t self){
 542   return SIMIX_process_self_get_data(self);
 543 }
 544
 545 void* SIMIX_process_self_get_data(smx_process_t self)
 546 {
 547   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 548
 549   if (!self) {
 550     return NULL;
 551   }
 552   return SIMIX_process_get_data(self);
 553 }
 554
 555 void SIMIX_pre_process_set_data(smx_simcall_t simcall, smx_process_t process,
 556                                 void *data){
 557   SIMIX_process_set_data(process, data);
 558 }
 559 void SIMIX_process_self_set_data(smx_process_t self, void *data)
 560 {
 561   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 562
 563   SIMIX_process_set_data(self, data);
 564 }
 565
 566 void* SIMIX_pre_process_get_data(smx_simcall_t simcall, smx_process_t process){
 567   return SIMIX_process_get_data(process);
 568 }
 569 void* SIMIX_process_get_data(smx_process_t process)
 570 {
 571   return process->data;
 572 }
 573
 574 void SIMIX_process_set_data(smx_process_t process, void *data)
 575 {
 576   process->data = data;
 577 }
 578
 579 smx_host_t SIMIX_pre_process_get_host(smx_simcall_t simcall, smx_process_t process){
 580   return SIMIX_process_get_host(process);
 581 }
 582 smx_host_t SIMIX_process_get_host(smx_process_t process)
 583 {
 584   return process->smx_host;
 585 }
 586
 587 /* needs to be public and without simcall because it is called
 588    by exceptions and logging events */
 589 const char* SIMIX_process_self_get_name(void) {
 590
 591   smx_process_t process = SIMIX_process_self();
 592   if (process == NULL || process == simix_global->maestro_process)
 593     return "";
 594
 595   return SIMIX_process_get_name(process);
 596 }
 597
 598 const char* SIMIX_pre_process_get_name(smx_simcall_t simcall, smx_process_t process) {
 599   return SIMIX_process_get_name(process);
 600 }
 601 const char* SIMIX_process_get_name(smx_process_t process)
 602 {
 603   return process->name;
 604 }
 605
 606 smx_process_t SIMIX_process_get_by_name(const char* name)
 607 {
 608   smx_process_t proc;
 609
 610   xbt_swag_foreach(proc, simix_global->process_list)
 611   {
 612     if(!strcmp(name, proc->name))
 613       return proc;
 614   }
 615   return NULL;
 616 }
 617
 618 int SIMIX_pre_process_is_suspended(smx_simcall_t simcall, smx_process_t process){
 619   return SIMIX_process_is_suspended(process);
 620 }
 621 int SIMIX_process_is_suspended(smx_process_t process)
 622 {
 623   return process->suspended;
 624 }
 625
 626 xbt_dict_t SIMIX_pre_process_get_properties(smx_simcall_t simcall, smx_process_t process){
 627   return SIMIX_process_get_properties(process);
 628 }
 629 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
 630 {
 631   return process->properties;
 632 }
 633
 634 void SIMIX_pre_process_sleep(smx_simcall_t simcall, double duration)
 635 {
 636   if (MC_is_active()) {
 637     MC_process_clock_add(simcall->issuer, duration);
 638     simcall_process_sleep__set__result(simcall, SIMIX_DONE);
 639     SIMIX_simcall_answer(simcall);
 640     return;
 641   }
 642   smx_action_t action = SIMIX_process_sleep(simcall->issuer, duration);
 643   xbt_fifo_push(action->simcalls, simcall);
 644   simcall->issuer->waiting_action = action;
 645 }
 646
 647 smx_action_t SIMIX_process_sleep(smx_process_t process, double duration)
 648 {
 649   smx_action_t action;
 650   smx_host_t host = process->smx_host;
 651
 652   /* check if the host is active */
 653   if (surf_workstation_model->extension.
 654       workstation.get_state(host) != SURF_RESOURCE_ON) {
 655     THROWF(host_error, 0, "Host %s failed, you cannot call this function",
 656            sg_host_name(host));
 657   }
 658
 659   action = xbt_mallocator_get(simix_global->action_mallocator);
 660   action->type = SIMIX_ACTION_SLEEP;
 661   action->name = NULL;
 662 #ifdef HAVE_TRACING
 663   action->category = NULL;
 664 #endif
 665
 666   action->sleep.host = host;
 667   action->sleep.surf_sleep =
 668       surf_workstation_model->extension.workstation.sleep(host, duration);
 669
 670   surf_workstation_model->action_data_set(action->sleep.surf_sleep, action);
 671   XBT_DEBUG("Create sleep action %p", action);
 672
 673   return action;
 674 }
 675
 676 void SIMIX_post_process_sleep(smx_action_t action)
 677 {
 678   smx_simcall_t simcall;
 679   e_smx_state_t state;
 680
 681   while ((simcall = xbt_fifo_shift(action->simcalls))) {
 682
 683     switch(surf_workstation_model->action_state_get(action->sleep.surf_sleep)){
 684       case SURF_ACTION_FAILED:
 685         simcall->issuer->context->iwannadie = 1;
 686         //SMX_EXCEPTION(simcall->issuer, host_error, 0, "Host failed");
 687         break;
 688
 689       case SURF_ACTION_DONE:
 690         state = SIMIX_DONE;
 691         break;
 692
 693       default:
 694         THROW_IMPOSSIBLE;
 695         break;
 696     }
 697     if (surf_workstation_model->extension.
 698         workstation.get_state(simcall->issuer->smx_host) != SURF_RESOURCE_ON) {
 699       simcall->issuer->context->iwannadie = 1;
 700     }
 701     simcall_process_sleep__set__result(simcall, state);
 702     simcall->issuer->waiting_action = NULL;
 703     SIMIX_simcall_answer(simcall);
 704
 705   }
 706   SIMIX_process_sleep_destroy(action);
 707 }
 708
 709 void SIMIX_process_sleep_destroy(smx_action_t action)
 710 {
 711   XBT_DEBUG("Destroy action %p", action);
 712   if (action->sleep.surf_sleep)
 713     action->sleep.surf_sleep->model_type->action_unref(action->sleep.surf_sleep);
 714   xbt_mallocator_release(simix_global->action_mallocator, action);
 715 }
 716
 717 void SIMIX_process_sleep_suspend(smx_action_t action)
 718 {
 719   surf_workstation_model->suspend(action->sleep.surf_sleep);
 720 }
 721
 722 void SIMIX_process_sleep_resume(smx_action_t action)
 723 {
 724   surf_workstation_model->resume(action->sleep.surf_sleep);
 725 }
 726
 727 /**
 728  * \brief Calling this function makes the process to yield.
 729  *
 730  * Only the current process can call this function, giving back the control to
 731  * maestro.
 732  *
 733  * \param self the current process
 734  */
 735 void SIMIX_process_yield(smx_process_t self)
 736 {
 737   XBT_DEBUG("Yield process '%s'", self->name);
 738
 739   /* Go into sleep and return control to maestro */
 740   SIMIX_context_suspend(self->context);
 741
 742   /* Ok, maestro returned control to us */
 743   XBT_DEBUG("Control returned to me: '%s'", self->name);
 744
 745   if (self->new_host) {
 746     SIMIX_process_change_host(self, self->new_host);
 747     self->new_host = NULL;
 748   }
 749
 750   if (self->context->iwannadie){
 751     XBT_DEBUG("I wanna die!");
 752     SIMIX_process_stop(self);
 753   }
 754
 755   if(self->suspended) {
 756     xbt_assert(!self->doexception, "Gloups! This exception may be lost by subsequent calls.");
 757     self->suspended = 0;
 758     SIMIX_process_suspend(self,self);
 759   }
 760
 761   if (self->doexception) {
 762     XBT_DEBUG("Wait, maestro left me an exception");
 763     self->doexception = 0;
 764     SMX_THROW();
 765   }
 766
 767 }
 768
 769 /* callback: context fetching */
 770 xbt_running_ctx_t *SIMIX_process_get_running_context(void)
 771 {
 772   return SIMIX_process_self()->running_ctx;
 773 }
 774
 775 /* callback: termination */
 776 void SIMIX_process_exception_terminate(xbt_ex_t * e)
 777 {
 778   xbt_ex_display(e);
 779   xbt_abort();
 780 }
 781
 782 smx_context_t SIMIX_process_get_context(smx_process_t p) {
 783   return p->context;
 784 }
 785
 786 void SIMIX_process_set_context(smx_process_t p,smx_context_t c) {
 787   p->context = c;
 788 }
 789
 790 /**
 791  * \brief Returns the list of processes to run.
 792  */
 793 xbt_dynar_t SIMIX_process_get_runnable(void)
 794 {
 795   return simix_global->process_to_run;
 796 }
 797
 798 /**
 799  * \brief Returns the process from PID.
 800  */
 801 smx_process_t SIMIX_process_from_PID(int PID)
 802 {
 803   smx_process_t proc;
 804   xbt_swag_foreach(proc, simix_global->process_list)
 805   {
 806    if(proc->pid == PID)
 807    return proc;
 808   }
 809   return NULL;
 810 }
 811
 812 /** @brief returns a dynar containg all currently existing processes */
 813 xbt_dynar_t SIMIX_processes_as_dynar(void) {
 814   smx_process_t proc;
 815   xbt_dynar_t res = xbt_dynar_new(sizeof(smx_process_t),NULL);
 816   xbt_swag_foreach(proc, simix_global->process_list) {
 817     xbt_dynar_push(res,&proc);
 818   }
 819   return res;
 820 }
 821
 822
 823 void SIMIX_process_on_exit_runall(smx_process_t process) {
 824   s_smx_process_exit_fun_t exit_fun;
 825
 826   while (!xbt_dynar_is_empty(process->on_exit)) {
 827     exit_fun = xbt_dynar_pop_as(process->on_exit,s_smx_process_exit_fun_t);
 828     (exit_fun.fun)(exit_fun.arg);
 829   }
 830 }
 831
 832 void SIMIX_pre_process_on_exit(smx_simcall_t simcall, smx_process_t process,
 833                                int_f_pvoid_t fun, void *data) {
 834   SIMIX_process_on_exit(process, fun, data);
 835 }
 836
 837 void SIMIX_process_on_exit(smx_process_t process, int_f_pvoid_t fun, void *data) {
 838   xbt_assert(process, "current process not found: are you in maestro context ?");
 839
 840   if (!process->on_exit) {
 841     process->on_exit = xbt_dynar_new(sizeof(s_smx_process_exit_fun_t), NULL);
 842   }
 843
 844   s_smx_process_exit_fun_t exit_fun = {fun, data};
 845
 846   xbt_dynar_push_as(process->on_exit,s_smx_process_exit_fun_t,exit_fun);
 847 }
 848
 849 void SIMIX_pre_process_auto_restart_set(smx_simcall_t simcall, smx_process_t process,
 850                                         int auto_restart) {
 851   SIMIX_process_auto_restart_set(process, auto_restart);
 852 }
 853 /**
 854  * \brief Sets the auto-restart status of the process.
 855  * If set to 1, the process will be automatically restarted when its host
 856  * comes back.
 857  */
 858 void SIMIX_process_auto_restart_set(smx_process_t process, int auto_restart) {
 859   process->auto_restart = auto_restart;
 860 }
 861
 862 smx_process_t SIMIX_pre_process_restart(smx_simcall_t simcall, smx_process_t process) {
 863   return SIMIX_process_restart(process, simcall->issuer);
 864 }
 865 /**
 866  * \brief Restart a process.
 867  * Restart a process, starting it again from the beginning.
 868  */
 869 smx_process_t SIMIX_process_restart(smx_process_t process, smx_process_t issuer) {
 870   XBT_DEBUG("Restarting process %s on %s", process->name, sg_host_name(process->smx_host));
 871   //retrieve the arguments of the old process
 872   //FIXME: Factorise this with SIMIX_host_add_auto_restart_process ?
 873   s_smx_process_arg_t arg;
 874   arg.code = process->code;
 875   arg.hostname = sg_host_name(process->smx_host);
 876   arg.kill_time = process->kill_time;
 877   arg.argc = process->argc;
 878   arg.data = process->data;
 879   int i;
 880   arg.argv = xbt_new(char*,process->argc + 1);
 881   for (i = 0; i < arg.argc; i++) {
 882     arg.argv[i] = xbt_strdup(process->argv[i]);
 883   }
 884   arg.argv[process->argc] = NULL;
 885   arg.properties = NULL;
 886   arg.auto_restart = process->auto_restart;
 887   //kill the old process
 888   SIMIX_process_kill(process,issuer);
 889   //start the new process
 890   smx_process_t new_process;
 891   if (simix_global->create_process_function) {
 892     simix_global->create_process_function(&new_process,
 893                                           arg.argv[0],
 894                                           arg.code,
 895                                           arg.data,
 896                                           arg.hostname,
 897                                           arg.kill_time,
 898                                           arg.argc,
 899                                           arg.argv,
 900                                           arg.properties,
 901                                           arg.auto_restart);
 902   }
 903   else {
 904     simcall_process_create(&new_process,
 905                                           arg.argv[0],
 906                                           arg.code,
 907                                           arg.data,
 908                                           arg.hostname,
 909                                           arg.kill_time,
 910                                           arg.argc,
 911                                           arg.argv,
 912                                           arg.properties,
 913                                           arg.auto_restart);
 914
 915   }
 916   return new_process;
 917 }