src/simix/smx_process.c

   1 /* Copyright (c) 2007-2014. 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_process(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   SIMIX_process_on_exit_runall(process);
  53
  54   /* cancel non-blocking communications */
  55   smx_action_t action;
  56   while ((action = xbt_fifo_pop(process->comms))) {
  57
  58     /* make sure no one will finish the comm after this process is destroyed,
  59      * because src_proc or dst_proc would be an invalid pointer */
  60     SIMIX_comm_cancel(action);
  61
  62     if (action->comm.src_proc == process) {
  63       XBT_DEBUG("Found an unfinished send comm %p (detached = %d), state %d, src = %p, dst = %p",
  64           action, action->comm.detached, (int)action->state, action->comm.src_proc, action->comm.dst_proc);
  65       action->comm.src_proc = NULL;
  66
  67       if (action->comm.detached) {
  68          if (action->comm.refcount == 0) {
  69            XBT_DEBUG("Increase the refcount before destroying it since it's detached");
  70            /* I'm not supposed to destroy a detached comm from the sender side,
  71             * unless there is no receiver matching the rdv */
  72            action->comm.refcount++;
  73            SIMIX_comm_destroy(action);
  74          }
  75          else {
  76            XBT_DEBUG("Don't destroy it since its refcount is %d", action->comm.refcount);
  77          }
  78       } else {
  79         SIMIX_comm_destroy(action);
  80       }
  81     }
  82     else if (action->comm.dst_proc == process){
  83       XBT_DEBUG("Found an unfinished recv comm %p, state %d, src = %p, dst = %p",
  84           action, (int)action->state, action->comm.src_proc, action->comm.dst_proc);
  85       action->comm.dst_proc = NULL;
  86
  87       if (action->comm.detached && action->comm.refcount == 1
  88           && action->comm.src_proc != NULL) {
  89         /* the comm will be freed right now, remove it from the sender */
  90         xbt_fifo_remove(action->comm.src_proc->comms, action);
  91       }
  92       SIMIX_comm_destroy(action);
  93     }
  94     else {
  95       xbt_die("Communication action %p is in my list but I'm not the sender "
  96           "or the receiver", action);
  97     }
  98   }
  99
 100   xbt_swag_remove(process, simix_global->process_list);
 101   xbt_swag_remove(process, SIMIX_host_priv(process->smx_host)->process_list);
 102   xbt_swag_insert(process, simix_global->process_to_destroy);
 103   process->context->iwannadie = 0;
 104 }
 105
 106 /**
 107  * Garbage collection
 108  *
 109  * Should be called some time to time to free the memory allocated for processes
 110  * that have finished (or killed).
 111  */
 112 void SIMIX_process_empty_trash(void)
 113 {
 114   smx_process_t process = NULL;
 115
 116   while ((process = xbt_swag_extract(simix_global->process_to_destroy))) {
 117     SIMIX_context_free(process->context);
 118
 119     /* Free the exception allocated at creation time */
 120     free(process->running_ctx);
 121     xbt_dict_free(&process->properties);
 122
 123     xbt_fifo_free(process->comms);
 124
 125     xbt_dynar_free(&process->on_exit);
 126
 127     xbt_free(process->name);
 128     xbt_free(process);
 129   }
 130 }
 131
 132 /**
 133  * \brief Creates and runs the maestro process
 134  */
 135 void SIMIX_create_maestro_process()
 136 {
 137   smx_process_t maestro = NULL;
 138
 139   /* Create maestro process and intilialize it */
 140   maestro = xbt_new0(s_smx_process_t, 1);
 141   maestro->pid = simix_process_maxpid++;
 142   maestro->ppid = -1;
 143   maestro->name = (char *) "";
 144   maestro->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 145   XBT_RUNNING_CTX_INITIALIZE(maestro->running_ctx);
 146   maestro->context = SIMIX_context_new(NULL, 0, NULL, NULL, maestro);
 147   maestro->simcall.issuer = maestro;
 148   simix_global->maestro_process = maestro;
 149   return;
 150 }
 151 /**
 152  * \brief Stops a process.
 153  *
 154  * Stops the process, execute all the registered on_exit functions,
 155  * register it to the list of the process to restart if needed
 156  * and stops its context.
 157  */
 158 void SIMIX_process_stop(smx_process_t arg) {
 159   /* execute the on_exit functions */
 160   SIMIX_process_on_exit_runall(arg);
 161   /* Add the process to the list of process to restart, only if
 162    * the host is down
 163    */
 164   if (arg->auto_restart && !SIMIX_host_get_state(arg->smx_host)) {
 165     SIMIX_host_add_auto_restart_process(arg->smx_host,arg->name,arg->code, arg->data,
 166                                         sg_host_name(arg->smx_host),
 167                                         arg->kill_time,
 168                                         arg->argc,arg->argv,arg->properties,
 169                                         arg->auto_restart);
 170   }
 171   XBT_DEBUG("Process %s (%s) is dead",arg->name,sg_host_name(arg->smx_host));
 172   /* stop the context */
 173   SIMIX_context_stop(arg->context);
 174 }
 175
 176 /**
 177  * \brief Same as SIMIX_process_create() but with only one argument (used by timers).
 178  * This function frees the argument.
 179  * \return the process created
 180  */
 181 smx_process_t SIMIX_process_create_from_wrapper(smx_process_arg_t args) {
 182
 183   smx_process_t process;
 184   simix_global->create_process_function(&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                                         NULL);
 195   xbt_free(args);
 196   return process;
 197 }
 198
 199
 200 void SIMIX_pre_process_create(smx_simcall_t simcall,
 201                           smx_process_t *process,
 202                           const char *name,
 203                           xbt_main_func_t code,
 204                           void *data,
 205                           const char *hostname,
 206                           double kill_time,
 207                           int argc, char **argv,
 208                           xbt_dict_t properties,
 209                           int auto_restart){
 210   SIMIX_process_create(process, name, code, data, hostname,
 211                        kill_time, argc, argv, properties, auto_restart,
 212                        simcall->issuer);
 213 }
 214 /**
 215  * \brief Internal function to create a process.
 216  *
 217  * This function actually creates the process.
 218  * It may be called when a SIMCALL_PROCESS_CREATE simcall occurs,
 219  * or directly for SIMIX internal purposes. The sure thing is that it's called from maestro context.
 220  *
 221  * \return the process created
 222  */
 223 void SIMIX_process_create(smx_process_t *process,
 224                           const char *name,
 225                           xbt_main_func_t code,
 226                           void *data,
 227                           const char *hostname,
 228                           double kill_time,
 229                           int argc, char **argv,
 230                           xbt_dict_t properties,
 231                           int auto_restart,
 232                           smx_process_t parent_process)
 233 {
 234   *process = NULL;
 235   smx_host_t host = SIMIX_host_get_by_name(hostname);
 236
 237   XBT_DEBUG("Start process %s on host '%s'", name, hostname);
 238
 239   if (!SIMIX_host_get_state(host)) {
 240     int i;
 241     XBT_WARN("Cannot launch process '%s' on failed host '%s'", name,
 242           hostname);
 243     for (i = 0; i < argc; i++)
 244       xbt_free(argv[i]);
 245     xbt_free(argv);
 246   }
 247   else {
 248     *process = xbt_new0(s_smx_process_t, 1);
 249
 250     xbt_assert(((code != NULL) && (host != NULL)), "Invalid parameters");
 251     /* Process data */
 252     (*process)->pid = simix_process_maxpid++;
 253     (*process)->name = xbt_strdup(name);
 254     (*process)->smx_host = host;
 255     (*process)->data = data;
 256     (*process)->comms = xbt_fifo_new();
 257     (*process)->simcall.issuer = *process;
 258
 259      if (parent_process) {
 260        (*process)->ppid = SIMIX_process_get_PID(parent_process);
 261      } else {
 262        (*process)->ppid = -1;
 263      }
 264
 265     /* Process data for auto-restart */
 266     (*process)->auto_restart = auto_restart;
 267     (*process)->code = code;
 268     (*process)->argc = argc;
 269     (*process)->argv = argv;
 270     (*process)->kill_time = kill_time;
 271
 272
 273     XBT_VERB("Create context %s", (*process)->name);
 274     (*process)->context = SIMIX_context_new(code, argc, argv,
 275       simix_global->cleanup_process_function, *process);
 276
 277     (*process)->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 278     XBT_RUNNING_CTX_INITIALIZE((*process)->running_ctx);
 279
 280     if(MC_is_active()){
 281       MC_ignore_heap((*process)->running_ctx, sizeof(*(*process)->running_ctx));
 282     }
 283
 284     /* Add properties */
 285     (*process)->properties = properties;
 286
 287     /* Add the process to it's host process list */
 288     xbt_swag_insert(*process, SIMIX_host_priv(host)->process_list);
 289
 290     XBT_DEBUG("Start context '%s'", (*process)->name);
 291
 292     /* Now insert it in the global process list and in the process to run list */
 293     xbt_swag_insert(*process, simix_global->process_list);
 294     XBT_DEBUG("Inserting %s(%s) in the to_run list", (*process)->name, sg_host_name(host));
 295     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, *process);
 296   }
 297
 298   if (kill_time > SIMIX_get_clock()) {
 299     if (simix_global->kill_process_function) {
 300       XBT_DEBUG("Process %s(%s) will be kill at time %f", (*process)->name,
 301           sg_host_name((*process)->smx_host), kill_time);
 302       SIMIX_timer_set(kill_time, simix_global->kill_process_function, *process);
 303     }
 304   }
 305 }
 306
 307 /**
 308  * \brief Executes the processes from simix_global->process_to_run.
 309  *
 310  * The processes of simix_global->process_to_run are run (in parallel if
 311  * possible).  On exit, simix_global->process_to_run is empty, and
 312  * simix_global->process_that_ran contains the list of processes that just ran.
 313  * The two lists are swapped so, be careful when using them before and after a
 314  * call to this function.
 315  */
 316 void SIMIX_process_runall(void)
 317 {
 318   SIMIX_context_runall();
 319
 320   xbt_dynar_t tmp = simix_global->process_that_ran;
 321   simix_global->process_that_ran = simix_global->process_to_run;
 322   simix_global->process_to_run = tmp;
 323   xbt_dynar_reset(simix_global->process_to_run);
 324 }
 325
 326 void SIMIX_pre_process_kill(smx_simcall_t simcall, smx_process_t process) {
 327   SIMIX_process_kill(process, simcall->issuer);
 328 }
 329 /**
 330  * \brief Internal function to kill a SIMIX process.
 331  *
 332  * This function may be called when a SIMCALL_PROCESS_KILL simcall occurs,
 333  * or directly for SIMIX internal purposes.
 334  *
 335  * \param process poor victim
 336  * \param issuer the process which has sent the PROCESS_KILL. Important to not schedule twice the same process.
 337  */
 338 void SIMIX_process_kill(smx_process_t process, smx_process_t issuer) {
 339
 340   XBT_DEBUG("Killing process %s on %s", process->name, sg_host_name(process->smx_host));
 341
 342   process->context->iwannadie = 1;
 343   process->blocked = 0;
 344   process->suspended = 0;
 345   /* FIXME: set doexception to 0 also? */
 346
 347   /* destroy the blocking action if any */
 348   if (process->waiting_action) {
 349
 350     switch (process->waiting_action->type) {
 351
 352     case SIMIX_ACTION_EXECUTE:
 353     case SIMIX_ACTION_PARALLEL_EXECUTE:
 354       SIMIX_host_execution_destroy(process->waiting_action);
 355       break;
 356
 357     case SIMIX_ACTION_COMMUNICATE:
 358       xbt_fifo_remove(process->comms, process->waiting_action);
 359       SIMIX_comm_cancel(process->waiting_action);
 360       SIMIX_comm_destroy(process->waiting_action);
 361       break;
 362
 363     case SIMIX_ACTION_SLEEP:
 364       SIMIX_process_sleep_destroy(process->waiting_action);
 365       break;
 366
 367     case SIMIX_ACTION_JOIN:
 368       SIMIX_process_sleep_destroy(process->waiting_action);
 369       break;
 370
 371     case SIMIX_ACTION_SYNCHRO:
 372       SIMIX_synchro_stop_waiting(process, &process->simcall);
 373       SIMIX_synchro_destroy(process->waiting_action);
 374       break;
 375
 376     case SIMIX_ACTION_IO:
 377       SIMIX_io_destroy(process->waiting_action);
 378       break;
 379
 380       /* **************************************/
 381       /* TUTORIAL: New API                    */
 382     case SIMIX_ACTION_NEW_API:
 383       SIMIX_new_api_destroy(process->waiting_action);
 384       break;
 385       /* **************************************/
 386
 387     }
 388   }
 389   if(!xbt_dynar_member(simix_global->process_to_run, &(process)) && process != issuer) {
 390     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, process);
 391   }
 392
 393 }
 394
 395 void SIMIX_pre_process_killall(smx_simcall_t simcall, int reset_pid) {
 396   SIMIX_process_killall(simcall->issuer, reset_pid);
 397 }
 398 /**
 399  * \brief Kills all running processes.
 400  * \param issuer this one will not be killed
 401  */
 402 void SIMIX_process_killall(smx_process_t issuer, int reset_pid)
 403 {
 404   smx_process_t p = NULL;
 405
 406   while ((p = xbt_swag_extract(simix_global->process_list))) {
 407     if (p != issuer) {
 408       SIMIX_process_kill(p,issuer);
 409     }
 410   }
 411
 412   if (reset_pid > 0)
 413     simix_process_maxpid = reset_pid;
 414
 415   SIMIX_context_runall();
 416
 417   SIMIX_process_empty_trash();
 418 }
 419
 420 void SIMIX_pre_process_change_host(smx_simcall_t simcall, smx_process_t process,
 421                                    smx_host_t dest)
 422 {
 423   process->new_host = dest;
 424 }
 425 void SIMIX_process_change_host(smx_process_t process,
 426              smx_host_t dest)
 427 {
 428   xbt_assert((process != NULL), "Invalid parameters");
 429   xbt_swag_remove(process, SIMIX_host_priv(process->smx_host)->process_list);
 430   process->smx_host = dest;
 431   xbt_swag_insert(process, SIMIX_host_priv(dest)->process_list);
 432 }
 433
 434
 435 void SIMIX_pre_process_suspend(smx_simcall_t simcall, smx_process_t process)
 436 {
 437   smx_action_t action_suspend =
 438       SIMIX_process_suspend(process, simcall->issuer);
 439
 440   if (process != simcall->issuer) {
 441     SIMIX_simcall_answer(simcall);
 442   } else {
 443     xbt_fifo_push(action_suspend->simcalls, simcall);
 444     process->waiting_action = action_suspend;
 445     SIMIX_host_execution_suspend(process->waiting_action);
 446   }
 447   /* If we are suspending ourselves, then just do not finish the simcall now */
 448 }
 449
 450 smx_action_t SIMIX_process_suspend(smx_process_t process, smx_process_t issuer)
 451 {
 452   xbt_assert((process != NULL), "Invalid parameters");
 453
 454   if (process->suspended) {
 455     XBT_DEBUG("Process '%s' is already suspended", process->name);
 456     return NULL;
 457   }
 458
 459   process->suspended = 1;
 460
 461   /* If we are suspending another process, and it is waiting on an action,
 462      suspend its action. */
 463   if (process != issuer) {
 464
 465     if (process->waiting_action) {
 466
 467       switch (process->waiting_action->type) {
 468
 469         case SIMIX_ACTION_EXECUTE:
 470         case SIMIX_ACTION_PARALLEL_EXECUTE:
 471           SIMIX_host_execution_suspend(process->waiting_action);
 472           break;
 473
 474         case SIMIX_ACTION_COMMUNICATE:
 475           SIMIX_comm_suspend(process->waiting_action);
 476           break;
 477
 478         case SIMIX_ACTION_SLEEP:
 479           SIMIX_process_sleep_suspend(process->waiting_action);
 480           break;
 481
 482         case SIMIX_ACTION_SYNCHRO:
 483           /* Suspension is delayed to when the process is rescheduled. */
 484           break;
 485
 486         default:
 487           xbt_die("Internal error in SIMIX_process_suspend: unexpected action type %d",
 488               (int)process->waiting_action->type);
 489       }
 490       return NULL;
 491     } else {
 492       /* Suspension is delayed to when the process is rescheduled. */
 493       return NULL;
 494     }
 495   } else {
 496     /* FIXME: computation size is zero. Is it okay that bound is zero ? */
 497     return SIMIX_host_execute("suspend", process->smx_host, 0.0, 1.0, 0.0, 0);
 498   }
 499 }
 500
 501 void SIMIX_pre_process_resume(smx_simcall_t simcall, smx_process_t process){
 502   SIMIX_process_resume(process, simcall->issuer);
 503 }
 504
 505 void SIMIX_process_resume(smx_process_t process, smx_process_t issuer)
 506 {
 507   xbt_assert((process != NULL), "Invalid parameters");
 508
 509   XBT_IN("process = %p, issuer = %p", process, issuer);
 510
 511   if(process->context->iwannadie) {
 512     XBT_VERB("Ignoring request to suspend a process that is currently dying.");
 513     return;
 514   }
 515
 516   if(!process->suspended) return;
 517   process->suspended = 0;
 518
 519   /* If we are resuming another process, resume the action it was waiting for
 520      if any. Otherwise add it to the list of process to run in the next round. */
 521   if (process != issuer) {
 522
 523     if (process->waiting_action) {
 524
 525       switch (process->waiting_action->type) {
 526
 527         case SIMIX_ACTION_EXECUTE:
 528         case SIMIX_ACTION_PARALLEL_EXECUTE:
 529           SIMIX_host_execution_resume(process->waiting_action);
 530           break;
 531
 532         case SIMIX_ACTION_COMMUNICATE:
 533           SIMIX_comm_resume(process->waiting_action);
 534           break;
 535
 536         case SIMIX_ACTION_SLEEP:
 537           SIMIX_process_sleep_resume(process->waiting_action);
 538           break;
 539
 540         case SIMIX_ACTION_SYNCHRO:
 541           /* I cannot resume it now. This is delayed to when the process is rescheduled at
 542            * the end of the synchro. */
 543           break;
 544
 545         default:
 546           xbt_die("Internal error in SIMIX_process_resume: unexpected action type %d",
 547               (int)process->waiting_action->type);
 548       }
 549     }
 550   } else XBT_WARN("Strange. Process %p is trying to resume himself.", issuer);
 551
 552   XBT_OUT();
 553 }
 554
 555 int SIMIX_process_get_maxpid(void) {
 556   return simix_process_maxpid;
 557 }
 558
 559 int SIMIX_pre_process_count(smx_simcall_t simcall){
 560   return SIMIX_process_count();
 561 }
 562 int SIMIX_process_count(void)
 563 {
 564   return xbt_swag_size(simix_global->process_list);
 565 }
 566
 567 int SIMIX_pre_process_get_PID(smx_simcall_t simcall, smx_process_t self){
 568    return SIMIX_process_get_PID(self);
 569 }
 570
 571 int SIMIX_process_get_PID(smx_process_t self){
 572   if (self == NULL)
 573     return 0;
 574   else
 575     return self->pid;
 576 }
 577
 578 int SIMIX_pre_process_get_PPID(smx_simcall_t simcall, smx_process_t self){
 579   return SIMIX_process_get_PPID(self);
 580 }
 581
 582 int SIMIX_process_get_PPID(smx_process_t self){
 583   if (self == NULL)
 584     return 0;
 585   else
 586     return self->ppid;
 587 }
 588
 589 void* SIMIX_pre_process_self_get_data(smx_simcall_t simcall, smx_process_t self){
 590   return SIMIX_process_self_get_data(self);
 591 }
 592
 593 void* SIMIX_process_self_get_data(smx_process_t self)
 594 {
 595   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 596
 597   if (!self) {
 598     return NULL;
 599   }
 600   return SIMIX_process_get_data(self);
 601 }
 602
 603 void SIMIX_pre_process_set_data(smx_simcall_t simcall, smx_process_t process,
 604                                 void *data){
 605   SIMIX_process_set_data(process, data);
 606 }
 607 void SIMIX_process_self_set_data(smx_process_t self, void *data)
 608 {
 609   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 610
 611   SIMIX_process_set_data(self, data);
 612 }
 613
 614 void* SIMIX_pre_process_get_data(smx_simcall_t simcall, smx_process_t process){
 615   return SIMIX_process_get_data(process);
 616 }
 617 void* SIMIX_process_get_data(smx_process_t process)
 618 {
 619   return process->data;
 620 }
 621
 622 void SIMIX_process_set_data(smx_process_t process, void *data)
 623 {
 624   process->data = data;
 625 }
 626
 627 smx_host_t SIMIX_pre_process_get_host(smx_simcall_t simcall, smx_process_t process){
 628   return SIMIX_process_get_host(process);
 629 }
 630 smx_host_t SIMIX_process_get_host(smx_process_t process)
 631 {
 632   return process->smx_host;
 633 }
 634
 635 /* needs to be public and without simcall because it is called
 636    by exceptions and logging events */
 637 const char* SIMIX_process_self_get_name(void) {
 638
 639   smx_process_t process = SIMIX_process_self();
 640   if (process == NULL || process == simix_global->maestro_process)
 641     return "";
 642
 643   return SIMIX_process_get_name(process);
 644 }
 645
 646 const char* SIMIX_pre_process_get_name(smx_simcall_t simcall, smx_process_t process) {
 647   return SIMIX_process_get_name(process);
 648 }
 649 const char* SIMIX_process_get_name(smx_process_t process)
 650 {
 651   return process->name;
 652 }
 653
 654 smx_process_t SIMIX_process_get_by_name(const char* name)
 655 {
 656   smx_process_t proc;
 657
 658   xbt_swag_foreach(proc, simix_global->process_list)
 659   {
 660     if(!strcmp(name, proc->name))
 661       return proc;
 662   }
 663   return NULL;
 664 }
 665
 666 int SIMIX_pre_process_is_suspended(smx_simcall_t simcall, smx_process_t process){
 667   return SIMIX_process_is_suspended(process);
 668 }
 669 int SIMIX_process_is_suspended(smx_process_t process)
 670 {
 671   return process->suspended;
 672 }
 673
 674 xbt_dict_t SIMIX_pre_process_get_properties(smx_simcall_t simcall, smx_process_t process){
 675   return SIMIX_process_get_properties(process);
 676 }
 677 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
 678 {
 679   return process->properties;
 680 }
 681
 682 void SIMIX_pre_process_join(smx_simcall_t simcall, smx_process_t process, double timeout)
 683 {
 684   smx_action_t action = SIMIX_process_join(simcall->issuer, process, timeout);
 685   xbt_fifo_push(action->simcalls, simcall);
 686   simcall->issuer->waiting_action = action;
 687 }
 688
 689 static int SIMIX_process_join_finish(smx_process_exit_status_t status, smx_action_t action){
 690   if (action->sleep.surf_sleep) {
 691     surf_action_cancel(action->sleep.surf_sleep);
 692
 693     smx_simcall_t simcall;
 694     while ((simcall = xbt_fifo_shift(action->simcalls))) {
 695       simcall_process_sleep__set__result(simcall, SIMIX_DONE);
 696       simcall->issuer->waiting_action = NULL;
 697       if (simcall->issuer->suspended) {
 698         XBT_DEBUG("Wait! This process is suspended and can't wake up now.");
 699         simcall->issuer->suspended = 0;
 700         SIMIX_pre_process_suspend(simcall, simcall->issuer);
 701       } else {
 702         SIMIX_simcall_answer(simcall);
 703       }
 704     }
 705     surf_action_unref(action->sleep.surf_sleep);
 706     action->sleep.surf_sleep = NULL;
 707   }
 708   xbt_mallocator_release(simix_global->action_mallocator, action);
 709   return 0;
 710 }
 711
 712 smx_action_t SIMIX_process_join(smx_process_t issuer, smx_process_t process, double timeout)
 713 {
 714   smx_action_t res = SIMIX_process_sleep(issuer, timeout);
 715   res->type = SIMIX_ACTION_JOIN;
 716   SIMIX_process_on_exit(process, (int_f_pvoid_pvoid_t)SIMIX_process_join_finish, res);
 717   return res;
 718 }
 719
 720 void SIMIX_pre_process_sleep(smx_simcall_t simcall, double duration)
 721 {
 722   if (MC_is_active()) {
 723     MC_process_clock_add(simcall->issuer, duration);
 724     simcall_process_sleep__set__result(simcall, SIMIX_DONE);
 725     SIMIX_simcall_answer(simcall);
 726     return;
 727   }
 728   smx_action_t action = SIMIX_process_sleep(simcall->issuer, duration);
 729   xbt_fifo_push(action->simcalls, simcall);
 730   simcall->issuer->waiting_action = action;
 731 }
 732
 733 smx_action_t SIMIX_process_sleep(smx_process_t process, double duration)
 734 {
 735   smx_action_t action;
 736   smx_host_t host = process->smx_host;
 737
 738   /* check if the host is active */
 739   if (surf_resource_get_state(surf_workstation_resource_priv(host)) != SURF_RESOURCE_ON) {
 740     THROWF(host_error, 0, "Host %s failed, you cannot call this function",
 741            sg_host_name(host));
 742   }
 743
 744   action = xbt_mallocator_get(simix_global->action_mallocator);
 745   action->type = SIMIX_ACTION_SLEEP;
 746   action->name = NULL;
 747 #ifdef HAVE_TRACING
 748   action->category = NULL;
 749 #endif
 750
 751   action->sleep.host = host;
 752   action->sleep.surf_sleep =
 753       surf_workstation_sleep(host, duration);
 754
 755   surf_action_set_data(action->sleep.surf_sleep, action);
 756   XBT_DEBUG("Create sleep action %p", action);
 757
 758   return action;
 759 }
 760
 761 void SIMIX_post_process_sleep(smx_action_t action)
 762 {
 763   smx_simcall_t simcall;
 764   e_smx_state_t state;
 765   xbt_assert(action->type == SIMIX_ACTION_SLEEP || action->type == SIMIX_ACTION_JOIN);
 766
 767   while ((simcall = xbt_fifo_shift(action->simcalls))) {
 768
 769     switch(surf_action_get_state(action->sleep.surf_sleep)){
 770       case SURF_ACTION_FAILED:
 771         simcall->issuer->context->iwannadie = 1;
 772         //SMX_EXCEPTION(simcall->issuer, host_error, 0, "Host failed");
 773         state = SIMIX_SRC_HOST_FAILURE;
 774         break;
 775
 776       case SURF_ACTION_DONE:
 777         state = SIMIX_DONE;
 778         break;
 779
 780       default:
 781         THROW_IMPOSSIBLE;
 782         break;
 783     }
 784     if (surf_resource_get_state(surf_workstation_resource_priv(simcall->issuer->smx_host)) != SURF_RESOURCE_ON) {
 785       simcall->issuer->context->iwannadie = 1;
 786     }
 787     simcall_process_sleep__set__result(simcall, state);
 788     simcall->issuer->waiting_action = NULL;
 789     if (simcall->issuer->suspended) {
 790       XBT_DEBUG("Wait! This process is suspended and can't wake up now.");
 791       simcall->issuer->suspended = 0;
 792       SIMIX_pre_process_suspend(simcall, simcall->issuer);
 793     } else {
 794       SIMIX_simcall_answer(simcall);
 795     }
 796   }
 797
 798   SIMIX_process_sleep_destroy(action);
 799 }
 800
 801 void SIMIX_process_sleep_destroy(smx_action_t action)
 802 {
 803   XBT_DEBUG("Destroy action %p", action);
 804   xbt_assert(action->type == SIMIX_ACTION_SLEEP || action->type == SIMIX_ACTION_JOIN);
 805
 806   if (action->sleep.surf_sleep) {
 807     surf_action_unref(action->sleep.surf_sleep);
 808     action->sleep.surf_sleep = NULL;
 809   }
 810   if (action->type == SIMIX_ACTION_SLEEP)
 811     xbt_mallocator_release(simix_global->action_mallocator, action);
 812 }
 813
 814 void SIMIX_process_sleep_suspend(smx_action_t action)
 815 {
 816   xbt_assert(action->type == SIMIX_ACTION_SLEEP);
 817   surf_action_suspend(action->sleep.surf_sleep);
 818 }
 819
 820 void SIMIX_process_sleep_resume(smx_action_t action)
 821 {
 822   XBT_DEBUG("Action state is %d on process_sleep_resume.", action->state);
 823   xbt_assert(action->type == SIMIX_ACTION_SLEEP);
 824   surf_action_resume(action->sleep.surf_sleep);
 825 }
 826
 827 /**
 828  * \brief Calling this function makes the process to yield.
 829  *
 830  * Only the current process can call this function, giving back the control to
 831  * maestro.
 832  *
 833  * \param self the current process
 834  */
 835 void SIMIX_process_yield(smx_process_t self)
 836 {
 837   XBT_DEBUG("Yield process '%s'", self->name);
 838
 839   /* Go into sleep and return control to maestro */
 840   SIMIX_context_suspend(self->context);
 841
 842   /* Ok, maestro returned control to us */
 843   XBT_DEBUG("Control returned to me: '%s'", self->name);
 844
 845   if (self->new_host) {
 846     SIMIX_process_change_host(self, self->new_host);
 847     self->new_host = NULL;
 848   }
 849
 850   if (self->context->iwannadie){
 851     XBT_DEBUG("I wanna die!");
 852     SIMIX_process_stop(self);
 853   }
 854
 855   if (self->suspended) {
 856     XBT_DEBUG("Hey! I'm suspended.");
 857     xbt_assert(!self->doexception, "Gloups! This exception may be lost by subsequent calls.");
 858     self->suspended = 0;
 859     SIMIX_process_suspend(self, self);
 860   }
 861
 862   if (self->doexception) {
 863     XBT_DEBUG("Wait, maestro left me an exception");
 864     self->doexception = 0;
 865     SMX_THROW();
 866   }
 867
 868 }
 869
 870 /* callback: context fetching */
 871 xbt_running_ctx_t *SIMIX_process_get_running_context(void)
 872 {
 873   return SIMIX_process_self()->running_ctx;
 874 }
 875
 876 /* callback: termination */
 877 void SIMIX_process_exception_terminate(xbt_ex_t * e)
 878 {
 879   xbt_ex_display(e);
 880   xbt_abort();
 881 }
 882
 883 smx_context_t SIMIX_process_get_context(smx_process_t p) {
 884   return p->context;
 885 }
 886
 887 void SIMIX_process_set_context(smx_process_t p,smx_context_t c) {
 888   p->context = c;
 889 }
 890
 891 /**
 892  * \brief Returns the list of processes to run.
 893  */
 894 xbt_dynar_t SIMIX_process_get_runnable(void)
 895 {
 896   return simix_global->process_to_run;
 897 }
 898
 899 /**
 900  * \brief Returns the process from PID.
 901  */
 902 smx_process_t SIMIX_process_from_PID(int PID)
 903 {
 904   smx_process_t proc;
 905   xbt_swag_foreach(proc, simix_global->process_list)
 906   {
 907    if(proc->pid == PID)
 908    return proc;
 909   }
 910   return NULL;
 911 }
 912
 913 /** @brief returns a dynar containg all currently existing processes */
 914 xbt_dynar_t SIMIX_processes_as_dynar(void) {
 915   smx_process_t proc;
 916   xbt_dynar_t res = xbt_dynar_new(sizeof(smx_process_t),NULL);
 917   xbt_swag_foreach(proc, simix_global->process_list) {
 918     xbt_dynar_push(res,&proc);
 919   }
 920   return res;
 921 }
 922
 923
 924 void SIMIX_process_on_exit_runall(smx_process_t process) {
 925   s_smx_process_exit_fun_t exit_fun;
 926   smx_process_exit_status_t exit_status = (process->context->iwannadie) ?
 927                                          SMX_EXIT_FAILURE : SMX_EXIT_SUCCESS;
 928   while (!xbt_dynar_is_empty(process->on_exit)) {
 929     exit_fun = xbt_dynar_pop_as(process->on_exit,s_smx_process_exit_fun_t);
 930     (exit_fun.fun)((void*)exit_status, exit_fun.arg);
 931   }
 932 }
 933
 934 void SIMIX_pre_process_on_exit(smx_simcall_t simcall, smx_process_t process,
 935                                int_f_pvoid_pvoid_t fun, void *data) {
 936   SIMIX_process_on_exit(process, fun, data);
 937 }
 938
 939 void SIMIX_process_on_exit(smx_process_t process, int_f_pvoid_pvoid_t fun, void *data) {
 940   xbt_assert(process, "current process not found: are you in maestro context ?");
 941
 942   if (!process->on_exit) {
 943     process->on_exit = xbt_dynar_new(sizeof(s_smx_process_exit_fun_t), NULL);
 944   }
 945
 946   s_smx_process_exit_fun_t exit_fun = {fun, data};
 947
 948   xbt_dynar_push_as(process->on_exit,s_smx_process_exit_fun_t,exit_fun);
 949 }
 950
 951 void SIMIX_pre_process_auto_restart_set(smx_simcall_t simcall, smx_process_t process,
 952                                         int auto_restart) {
 953   SIMIX_process_auto_restart_set(process, auto_restart);
 954 }
 955 /**
 956  * \brief Sets the auto-restart status of the process.
 957  * If set to 1, the process will be automatically restarted when its host
 958  * comes back.
 959  */
 960 void SIMIX_process_auto_restart_set(smx_process_t process, int auto_restart) {
 961   process->auto_restart = auto_restart;
 962 }
 963
 964 smx_process_t SIMIX_pre_process_restart(smx_simcall_t simcall, smx_process_t process) {
 965   return SIMIX_process_restart(process, simcall->issuer);
 966 }
 967 /**
 968  * \brief Restart a process.
 969  * Restart a process, starting it again from the beginning.
 970  */
 971 smx_process_t SIMIX_process_restart(smx_process_t process, smx_process_t issuer) {
 972   XBT_DEBUG("Restarting process %s on %s", process->name, sg_host_name(process->smx_host));
 973   //retrieve the arguments of the old process
 974   //FIXME: Factorise this with SIMIX_host_add_auto_restart_process ?
 975   s_smx_process_arg_t arg;
 976   arg.code = process->code;
 977   arg.hostname = sg_host_name(process->smx_host);
 978   arg.kill_time = process->kill_time;
 979   arg.argc = process->argc;
 980   arg.data = process->data;
 981   int i;
 982   arg.argv = xbt_new(char*,process->argc + 1);
 983   for (i = 0; i < arg.argc; i++) {
 984     arg.argv[i] = xbt_strdup(process->argv[i]);
 985   }
 986   arg.argv[process->argc] = NULL;
 987   arg.properties = NULL;
 988   arg.auto_restart = process->auto_restart;
 989   //kill the old process
 990   SIMIX_process_kill(process,issuer);
 991   //start the new process
 992   smx_process_t new_process;
 993   if (simix_global->create_process_function) {
 994     simix_global->create_process_function(&new_process,
 995                                           arg.argv[0],
 996                                           arg.code,
 997                                           arg.data,
 998                                           arg.hostname,
 999                                           arg.kill_time,
1000                                           arg.argc,
1001                                           arg.argv,
1002                                           arg.properties,
1003                                           arg.auto_restart,
1004                                           NULL);
1005   } else {
1006     simcall_process_create(&new_process,
1007                            arg.argv[0],
1008                            arg.code,
1009                            arg.data,
1010                            arg.hostname,
1011                            arg.kill_time,
1012                            arg.argc,
1013                            arg.argv,
1014                            arg.properties,
1015                            arg.auto_restart);
1016
1017   }
1018   return new_process;
1019 }