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 simcall_HANDLER_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       /* I'm not supposed to destroy a detached comm from the sender side, */
  68       if (!action->comm.detached)
  69         SIMIX_comm_destroy(action);
  70       else
  71         XBT_DEBUG("Don't destroy it since it's a detached comm");
  72
  73     }
  74     else if (action->comm.dst_proc == process){
  75       XBT_DEBUG("Found an unfinished recv comm %p, state %d, src = %p, dst = %p",
  76           action, (int)action->state, action->comm.src_proc, action->comm.dst_proc);
  77       action->comm.dst_proc = NULL;
  78
  79       if (action->comm.detached && action->comm.refcount == 1
  80           && action->comm.src_proc != NULL) {
  81         /* the comm will be freed right now, remove it from the sender */
  82         xbt_fifo_remove(action->comm.src_proc->comms, action);
  83       }
  84       SIMIX_comm_destroy(action);
  85     }
  86     else {
  87       xbt_die("Communication action %p is in my list but I'm not the sender "
  88           "or the receiver", action);
  89     }
  90   }
  91
  92   xbt_swag_remove(process, simix_global->process_list);
  93   xbt_swag_remove(process, SIMIX_host_priv(process->smx_host)->process_list);
  94   xbt_swag_insert(process, simix_global->process_to_destroy);
  95   process->context->iwannadie = 0;
  96 }
  97
  98 /**
  99  * Garbage collection
 100  *
 101  * Should be called some time to time to free the memory allocated for processes
 102  * that have finished (or killed).
 103  */
 104 void SIMIX_process_empty_trash(void)
 105 {
 106   smx_process_t process = NULL;
 107
 108   while ((process = xbt_swag_extract(simix_global->process_to_destroy))) {
 109     SIMIX_context_free(process->context);
 110
 111     /* Free the exception allocated at creation time */
 112     free(process->running_ctx);
 113     xbt_dict_free(&process->properties);
 114
 115     xbt_fifo_free(process->comms);
 116
 117     xbt_dynar_free(&process->on_exit);
 118
 119     xbt_free(process->name);
 120     xbt_free(process);
 121   }
 122 }
 123
 124 /**
 125  * \brief Creates and runs the maestro process
 126  */
 127 void SIMIX_create_maestro_process()
 128 {
 129   smx_process_t maestro = NULL;
 130
 131   /* Create maestro process and intilialize it */
 132   maestro = xbt_new0(s_smx_process_t, 1);
 133   maestro->pid = simix_process_maxpid++;
 134   maestro->ppid = -1;
 135   maestro->name = (char *) "";
 136   maestro->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 137   XBT_RUNNING_CTX_INITIALIZE(maestro->running_ctx);
 138   maestro->context = SIMIX_context_new(NULL, 0, NULL, NULL, maestro);
 139   maestro->simcall.issuer = maestro;
 140   simix_global->maestro_process = maestro;
 141   return;
 142 }
 143 /**
 144  * \brief Stops a process.
 145  *
 146  * Stops the process, execute all the registered on_exit functions,
 147  * register it to the list of the process to restart if needed
 148  * and stops its context.
 149  */
 150 void SIMIX_process_stop(smx_process_t arg) {
 151   /* execute the on_exit functions */
 152   SIMIX_process_on_exit_runall(arg);
 153   /* Add the process to the list of process to restart, only if
 154    * the host is down
 155    */
 156   if (arg->auto_restart && !SIMIX_host_get_state(arg->smx_host)) {
 157     SIMIX_host_add_auto_restart_process(arg->smx_host,arg->name,arg->code, arg->data,
 158                                         sg_host_name(arg->smx_host),
 159                                         arg->kill_time,
 160                                         arg->argc,arg->argv,arg->properties,
 161                                         arg->auto_restart);
 162   }
 163   XBT_DEBUG("Process %s (%s) is dead",arg->name,sg_host_name(arg->smx_host));
 164   /* stop the context */
 165   SIMIX_context_stop(arg->context);
 166 }
 167
 168 /**
 169  * \brief Same as SIMIX_process_create() but with only one argument (used by timers).
 170  * This function frees the argument.
 171  * \return the process created
 172  */
 173 smx_process_t SIMIX_process_create_from_wrapper(smx_process_arg_t args) {
 174
 175   smx_process_t process;
 176   simix_global->create_process_function(&process,
 177                                         args->name,
 178                                         args->code,
 179                                         args->data,
 180                                         args->hostname,
 181                                         args->kill_time,
 182                                         args->argc,
 183                                         args->argv,
 184                                         args->properties,
 185                                         args->auto_restart,
 186                                         NULL);
 187   xbt_free(args);
 188   return process;
 189 }
 190
 191
 192 void simcall_HANDLER_process_create(smx_simcall_t simcall,
 193                           smx_process_t *process,
 194                           const char *name,
 195                           xbt_main_func_t code,
 196                           void *data,
 197                           const char *hostname,
 198                           double kill_time,
 199                           int argc, char **argv,
 200                           xbt_dict_t properties,
 201                           int auto_restart){
 202   SIMIX_process_create(process, name, code, data, hostname,
 203                        kill_time, argc, argv, properties, auto_restart,
 204                        simcall->issuer);
 205 }
 206 /**
 207  * \brief Internal function to create a process.
 208  *
 209  * This function actually creates the process.
 210  * It may be called when a SIMCALL_PROCESS_CREATE simcall occurs,
 211  * or directly for SIMIX internal purposes. The sure thing is that it's called from maestro context.
 212  *
 213  * \return the process created
 214  */
 215 void SIMIX_process_create(smx_process_t *process,
 216                           const char *name,
 217                           xbt_main_func_t code,
 218                           void *data,
 219                           const char *hostname,
 220                           double kill_time,
 221                           int argc, char **argv,
 222                           xbt_dict_t properties,
 223                           int auto_restart,
 224                           smx_process_t parent_process)
 225 {
 226   *process = NULL;
 227   smx_host_t host = SIMIX_host_get_by_name(hostname);
 228
 229   XBT_DEBUG("Start process %s on host '%s'", name, hostname);
 230
 231   if (!SIMIX_host_get_state(host)) {
 232     int i;
 233     XBT_WARN("Cannot launch process '%s' on failed host '%s'", name,
 234           hostname);
 235     for (i = 0; i < argc; i++)
 236       xbt_free(argv[i]);
 237     xbt_free(argv);
 238   }
 239   else {
 240     *process = xbt_new0(s_smx_process_t, 1);
 241
 242     xbt_assert(((code != NULL) && (host != NULL)), "Invalid parameters");
 243     /* Process data */
 244     (*process)->pid = simix_process_maxpid++;
 245     (*process)->name = xbt_strdup(name);
 246     (*process)->smx_host = host;
 247     (*process)->data = data;
 248     (*process)->comms = xbt_fifo_new();
 249     (*process)->simcall.issuer = *process;
 250
 251      if (parent_process) {
 252        (*process)->ppid = SIMIX_process_get_PID(parent_process);
 253      } else {
 254        (*process)->ppid = -1;
 255      }
 256
 257     /* Process data for auto-restart */
 258     (*process)->auto_restart = auto_restart;
 259     (*process)->code = code;
 260     (*process)->argc = argc;
 261     (*process)->argv = argv;
 262     (*process)->kill_time = kill_time;
 263
 264
 265     XBT_VERB("Create context %s", (*process)->name);
 266     (*process)->context = SIMIX_context_new(code, argc, argv,
 267       simix_global->cleanup_process_function, *process);
 268
 269     (*process)->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 270     XBT_RUNNING_CTX_INITIALIZE((*process)->running_ctx);
 271
 272     if(MC_is_active()){
 273       MC_ignore_heap((*process)->running_ctx, sizeof(*(*process)->running_ctx));
 274     }
 275
 276     /* Add properties */
 277     (*process)->properties = properties;
 278
 279     /* Add the process to it's host process list */
 280     xbt_swag_insert(*process, SIMIX_host_priv(host)->process_list);
 281
 282     XBT_DEBUG("Start context '%s'", (*process)->name);
 283
 284     /* Now insert it in the global process list and in the process to run list */
 285     xbt_swag_insert(*process, simix_global->process_list);
 286     XBT_DEBUG("Inserting %s(%s) in the to_run list", (*process)->name, sg_host_name(host));
 287     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, *process);
 288
 289     if (kill_time > SIMIX_get_clock() && simix_global->kill_process_function) {
 290       XBT_DEBUG("Process %s(%s) will be kill at time %f", (*process)->name,
 291           sg_host_name((*process)->smx_host), kill_time);
 292       SIMIX_timer_set(kill_time, simix_global->kill_process_function, *process);
 293     }
 294   }
 295 }
 296
 297 /**
 298  * \brief Executes the processes from simix_global->process_to_run.
 299  *
 300  * The processes of simix_global->process_to_run are run (in parallel if
 301  * possible).  On exit, simix_global->process_to_run is empty, and
 302  * simix_global->process_that_ran contains the list of processes that just ran.
 303  * The two lists are swapped so, be careful when using them before and after a
 304  * call to this function.
 305  */
 306 void SIMIX_process_runall(void)
 307 {
 308   SIMIX_context_runall();
 309
 310   xbt_dynar_t tmp = simix_global->process_that_ran;
 311   simix_global->process_that_ran = simix_global->process_to_run;
 312   simix_global->process_to_run = tmp;
 313   xbt_dynar_reset(simix_global->process_to_run);
 314 }
 315
 316 void simcall_HANDLER_process_kill(smx_simcall_t simcall, smx_process_t process) {
 317   SIMIX_process_kill(process, simcall->issuer);
 318 }
 319 /**
 320  * \brief Internal function to kill a SIMIX process.
 321  *
 322  * This function may be called when a SIMCALL_PROCESS_KILL simcall occurs,
 323  * or directly for SIMIX internal purposes.
 324  *
 325  * \param process poor victim
 326  * \param issuer the process which has sent the PROCESS_KILL. Important to not schedule twice the same process.
 327  */
 328 void SIMIX_process_kill(smx_process_t process, smx_process_t issuer) {
 329
 330   XBT_DEBUG("Killing process %s on %s", process->name, sg_host_name(process->smx_host));
 331
 332   process->context->iwannadie = 1;
 333   process->blocked = 0;
 334   process->suspended = 0;
 335   process->doexception = 0;
 336
 337   /* destroy the blocking action if any */
 338   if (process->waiting_action) {
 339
 340     switch (process->waiting_action->type) {
 341
 342     case SIMIX_ACTION_EXECUTE:
 343     case SIMIX_ACTION_PARALLEL_EXECUTE:
 344       SIMIX_host_execution_destroy(process->waiting_action);
 345       break;
 346
 347     case SIMIX_ACTION_COMMUNICATE:
 348       xbt_fifo_remove(process->comms, process->waiting_action);
 349       SIMIX_comm_cancel(process->waiting_action);
 350       SIMIX_comm_destroy(process->waiting_action);
 351       break;
 352
 353     case SIMIX_ACTION_SLEEP:
 354       SIMIX_process_sleep_destroy(process->waiting_action);
 355       break;
 356
 357     case SIMIX_ACTION_JOIN:
 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   }
 372   if(!xbt_dynar_member(simix_global->process_to_run, &(process)) && process != issuer) {
 373     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, process);
 374   }
 375
 376 }
 377
 378 /** @brief Ask another process to raise the given exception
 379  *
 380  * @param cat category of exception
 381  * @param value value associated to the exception
 382  * @param msg string information associated to the exception
 383  */
 384 void SIMIX_process_throw(smx_process_t process, xbt_errcat_t cat, int value, const char *msg) {
 385   SMX_EXCEPTION(process, cat, value, msg);
 386
 387   if (process->suspended)
 388     SIMIX_process_resume(process,SIMIX_process_self());
 389
 390   /* cancel the blocking action if any */
 391   if (process->waiting_action) {
 392
 393     switch (process->waiting_action->type) {
 394
 395     case SIMIX_ACTION_EXECUTE:
 396     case SIMIX_ACTION_PARALLEL_EXECUTE:
 397       SIMIX_host_execution_cancel(process->waiting_action);
 398       break;
 399
 400     case SIMIX_ACTION_COMMUNICATE:
 401       xbt_fifo_remove(process->comms, process->waiting_action);
 402       SIMIX_comm_cancel(process->waiting_action);
 403       break;
 404
 405     case SIMIX_ACTION_SLEEP:
 406       SIMIX_process_sleep_destroy(process->waiting_action);
 407       break;
 408
 409     case SIMIX_ACTION_JOIN:
 410       SIMIX_process_sleep_destroy(process->waiting_action);
 411       break;
 412
 413     case SIMIX_ACTION_SYNCHRO:
 414       SIMIX_synchro_stop_waiting(process, &process->simcall);
 415       break;
 416
 417     case SIMIX_ACTION_IO:
 418       SIMIX_io_destroy(process->waiting_action);
 419       break;
 420
 421     }
 422   }
 423   process->waiting_action = NULL;
 424
 425   if (!xbt_dynar_member(simix_global->process_to_run, &(process)) && process != SIMIX_process_self())
 426     xbt_dynar_push_as(simix_global->process_to_run, smx_process_t, process);
 427 }
 428
 429 void simcall_HANDLER_process_killall(smx_simcall_t simcall, int reset_pid) {
 430   SIMIX_process_killall(simcall->issuer, reset_pid);
 431 }
 432 /**
 433  * \brief Kills all running processes.
 434  * \param issuer this one will not be killed
 435  */
 436 void SIMIX_process_killall(smx_process_t issuer, int reset_pid)
 437 {
 438   smx_process_t p = NULL;
 439
 440   while ((p = xbt_swag_extract(simix_global->process_list))) {
 441     if (p != issuer) {
 442       SIMIX_process_kill(p,issuer);
 443     }
 444   }
 445
 446   if (reset_pid > 0)
 447     simix_process_maxpid = reset_pid;
 448
 449   SIMIX_context_runall();
 450
 451   SIMIX_process_empty_trash();
 452 }
 453
 454 void simcall_HANDLER_process_change_host(smx_simcall_t simcall, smx_process_t process,
 455                                    smx_host_t dest)
 456 {
 457   process->new_host = dest;
 458 }
 459 void SIMIX_process_change_host(smx_process_t process,
 460              smx_host_t dest)
 461 {
 462   xbt_assert((process != NULL), "Invalid parameters");
 463   xbt_swag_remove(process, SIMIX_host_priv(process->smx_host)->process_list);
 464   process->smx_host = dest;
 465   xbt_swag_insert(process, SIMIX_host_priv(dest)->process_list);
 466 }
 467
 468
 469 void simcall_HANDLER_process_suspend(smx_simcall_t simcall, smx_process_t process)
 470 {
 471   smx_action_t action_suspend =
 472       SIMIX_process_suspend(process, simcall->issuer);
 473
 474   if (process != simcall->issuer) {
 475     SIMIX_simcall_answer(simcall);
 476   } else {
 477     xbt_fifo_push(action_suspend->simcalls, simcall);
 478     process->waiting_action = action_suspend;
 479     SIMIX_host_execution_suspend(process->waiting_action);
 480   }
 481   /* If we are suspending ourselves, then just do not finish the simcall now */
 482 }
 483
 484 smx_action_t SIMIX_process_suspend(smx_process_t process, smx_process_t issuer)
 485 {
 486   xbt_assert((process != NULL), "Invalid parameters");
 487
 488   if (process->suspended) {
 489     XBT_DEBUG("Process '%s' is already suspended", process->name);
 490     return NULL;
 491   }
 492
 493   process->suspended = 1;
 494
 495   /* If we are suspending another process, and it is waiting on an action,
 496      suspend its action. */
 497   if (process != issuer) {
 498
 499     if (process->waiting_action) {
 500
 501       switch (process->waiting_action->type) {
 502
 503         case SIMIX_ACTION_EXECUTE:
 504         case SIMIX_ACTION_PARALLEL_EXECUTE:
 505           SIMIX_host_execution_suspend(process->waiting_action);
 506           break;
 507
 508         case SIMIX_ACTION_COMMUNICATE:
 509           SIMIX_comm_suspend(process->waiting_action);
 510           break;
 511
 512         case SIMIX_ACTION_SLEEP:
 513           SIMIX_process_sleep_suspend(process->waiting_action);
 514           break;
 515
 516         case SIMIX_ACTION_SYNCHRO:
 517           /* Suspension is delayed to when the process is rescheduled. */
 518           break;
 519
 520         default:
 521           xbt_die("Internal error in SIMIX_process_suspend: unexpected action type %d",
 522               (int)process->waiting_action->type);
 523       }
 524       return NULL;
 525     } else {
 526       /* Suspension is delayed to when the process is rescheduled. */
 527       return NULL;
 528     }
 529   } else {
 530     /* FIXME: computation size is zero. Is it okay that bound is zero ? */
 531     return SIMIX_host_execute("suspend", process->smx_host, 0.0, 1.0, 0.0, 0);
 532   }
 533 }
 534
 535 void simcall_HANDLER_process_resume(smx_simcall_t simcall, smx_process_t process){
 536   SIMIX_process_resume(process, simcall->issuer);
 537 }
 538
 539 void SIMIX_process_resume(smx_process_t process, smx_process_t issuer)
 540 {
 541   XBT_IN("process = %p, issuer = %p", process, issuer);
 542
 543   if(process->context->iwannadie) {
 544     XBT_VERB("Ignoring request to suspend a process that is currently dying.");
 545     return;
 546   }
 547
 548   if(!process->suspended) return;
 549   process->suspended = 0;
 550
 551   /* If we are resuming another process, resume the action it was waiting for
 552      if any. Otherwise add it to the list of process to run in the next round. */
 553   if (process != issuer) {
 554
 555     if (process->waiting_action) {
 556
 557       switch (process->waiting_action->type) {
 558
 559         case SIMIX_ACTION_EXECUTE:
 560         case SIMIX_ACTION_PARALLEL_EXECUTE:
 561           SIMIX_host_execution_resume(process->waiting_action);
 562           break;
 563
 564         case SIMIX_ACTION_COMMUNICATE:
 565           SIMIX_comm_resume(process->waiting_action);
 566           break;
 567
 568         case SIMIX_ACTION_SLEEP:
 569           SIMIX_process_sleep_resume(process->waiting_action);
 570           break;
 571
 572         case SIMIX_ACTION_SYNCHRO:
 573           /* I cannot resume it now. This is delayed to when the process is rescheduled at
 574            * the end of the synchro. */
 575           break;
 576
 577         default:
 578           xbt_die("Internal error in SIMIX_process_resume: unexpected action type %d",
 579               (int)process->waiting_action->type);
 580       }
 581     }
 582   } else XBT_WARN("Strange. Process %p is trying to resume himself.", issuer);
 583
 584   XBT_OUT();
 585 }
 586
 587 int SIMIX_process_get_maxpid(void) {
 588   return simix_process_maxpid;
 589 }
 590
 591 int simcall_HANDLER_process_count(smx_simcall_t simcall){
 592   return SIMIX_process_count();
 593 }
 594 int SIMIX_process_count(void)
 595 {
 596   return xbt_swag_size(simix_global->process_list);
 597 }
 598
 599 int simcall_HANDLER_process_get_PID(smx_simcall_t simcall, smx_process_t self){
 600    return SIMIX_process_get_PID(self);
 601 }
 602
 603 int SIMIX_process_get_PID(smx_process_t self){
 604   if (self == NULL)
 605     return 0;
 606   else
 607     return self->pid;
 608 }
 609
 610 int simcall_HANDLER_process_get_PPID(smx_simcall_t simcall, smx_process_t self){
 611   return SIMIX_process_get_PPID(self);
 612 }
 613
 614 int SIMIX_process_get_PPID(smx_process_t self){
 615   if (self == NULL)
 616     return 0;
 617   else
 618     return self->ppid;
 619 }
 620
 621 void* simcall_HANDLER_process_self_get_data(smx_simcall_t simcall, smx_process_t self){
 622   return SIMIX_process_self_get_data(self);
 623 }
 624
 625 void* SIMIX_process_self_get_data(smx_process_t self)
 626 {
 627   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 628
 629   if (!self) {
 630     return NULL;
 631   }
 632   return SIMIX_process_get_data(self);
 633 }
 634
 635 void simcall_HANDLER_process_set_data(smx_simcall_t simcall, smx_process_t process,
 636                                 void *data){
 637   SIMIX_process_set_data(process, data);
 638 }
 639 void SIMIX_process_self_set_data(smx_process_t self, void *data)
 640 {
 641   xbt_assert(self == SIMIX_process_self(), "This is not the current process");
 642
 643   SIMIX_process_set_data(self, data);
 644 }
 645
 646 void* simcall_HANDLER_process_get_data(smx_simcall_t simcall, smx_process_t process){
 647   return SIMIX_process_get_data(process);
 648 }
 649 void* SIMIX_process_get_data(smx_process_t process)
 650 {
 651   return process->data;
 652 }
 653
 654 void SIMIX_process_set_data(smx_process_t process, void *data)
 655 {
 656   process->data = data;
 657 }
 658
 659 smx_host_t simcall_HANDLER_process_get_host(smx_simcall_t simcall, smx_process_t process){
 660   return SIMIX_process_get_host(process);
 661 }
 662 smx_host_t SIMIX_process_get_host(smx_process_t process)
 663 {
 664   return process->smx_host;
 665 }
 666
 667 /* needs to be public and without simcall because it is called
 668    by exceptions and logging events */
 669 const char* SIMIX_process_self_get_name(void) {
 670
 671   smx_process_t process = SIMIX_process_self();
 672   if (process == NULL || process == simix_global->maestro_process)
 673     return "";
 674
 675   return SIMIX_process_get_name(process);
 676 }
 677
 678 const char* simcall_HANDLER_process_get_name(smx_simcall_t simcall, smx_process_t process) {
 679   return SIMIX_process_get_name(process);
 680 }
 681 const char* SIMIX_process_get_name(smx_process_t process)
 682 {
 683   return process->name;
 684 }
 685
 686 smx_process_t SIMIX_process_get_by_name(const char* name)
 687 {
 688   smx_process_t proc;
 689
 690   xbt_swag_foreach(proc, simix_global->process_list)
 691   {
 692     if(!strcmp(name, proc->name))
 693       return proc;
 694   }
 695   return NULL;
 696 }
 697
 698 int simcall_HANDLER_process_is_suspended(smx_simcall_t simcall, smx_process_t process){
 699   return SIMIX_process_is_suspended(process);
 700 }
 701 int SIMIX_process_is_suspended(smx_process_t process)
 702 {
 703   return process->suspended;
 704 }
 705
 706 xbt_dict_t simcall_HANDLER_process_get_properties(smx_simcall_t simcall, smx_process_t process){
 707   return SIMIX_process_get_properties(process);
 708 }
 709 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
 710 {
 711   return process->properties;
 712 }
 713
 714 void simcall_HANDLER_process_join(smx_simcall_t simcall, smx_process_t process, double timeout)
 715 {
 716   smx_action_t action = SIMIX_process_join(simcall->issuer, process, timeout);
 717   xbt_fifo_push(action->simcalls, simcall);
 718   simcall->issuer->waiting_action = action;
 719 }
 720
 721 static int SIMIX_process_join_finish(smx_process_exit_status_t status, smx_action_t action){
 722   if (action->sleep.surf_sleep) {
 723     surf_action_cancel(action->sleep.surf_sleep);
 724
 725     smx_simcall_t simcall;
 726     while ((simcall = xbt_fifo_shift(action->simcalls))) {
 727       simcall_process_sleep__set__result(simcall, SIMIX_DONE);
 728       simcall->issuer->waiting_action = NULL;
 729       if (simcall->issuer->suspended) {
 730         XBT_DEBUG("Wait! This process is suspended and can't wake up now.");
 731         simcall->issuer->suspended = 0;
 732         simcall_HANDLER_process_suspend(simcall, simcall->issuer);
 733       } else {
 734         SIMIX_simcall_answer(simcall);
 735       }
 736     }
 737     surf_action_unref(action->sleep.surf_sleep);
 738     action->sleep.surf_sleep = NULL;
 739   }
 740   xbt_mallocator_release(simix_global->action_mallocator, action);
 741   return 0;
 742 }
 743
 744 smx_action_t SIMIX_process_join(smx_process_t issuer, smx_process_t process, double timeout)
 745 {
 746   smx_action_t res = SIMIX_process_sleep(issuer, timeout);
 747   res->type = SIMIX_ACTION_JOIN;
 748   SIMIX_process_on_exit(process, (int_f_pvoid_pvoid_t)SIMIX_process_join_finish, res);
 749   return res;
 750 }
 751
 752 void simcall_HANDLER_process_sleep(smx_simcall_t simcall, double duration)
 753 {
 754   if (MC_is_active()) {
 755     MC_process_clock_add(simcall->issuer, duration);
 756     simcall_process_sleep__set__result(simcall, SIMIX_DONE);
 757     SIMIX_simcall_answer(simcall);
 758     return;
 759   }
 760   smx_action_t action = SIMIX_process_sleep(simcall->issuer, duration);
 761   xbt_fifo_push(action->simcalls, simcall);
 762   simcall->issuer->waiting_action = action;
 763 }
 764
 765 smx_action_t SIMIX_process_sleep(smx_process_t process, double duration)
 766 {
 767   smx_action_t action;
 768   smx_host_t host = process->smx_host;
 769
 770   /* check if the host is active */
 771   if (surf_resource_get_state(surf_workstation_resource_priv(host)) != SURF_RESOURCE_ON) {
 772     THROWF(host_error, 0, "Host %s failed, you cannot call this function",
 773            sg_host_name(host));
 774   }
 775
 776   action = xbt_mallocator_get(simix_global->action_mallocator);
 777   action->type = SIMIX_ACTION_SLEEP;
 778   action->name = NULL;
 779 #ifdef HAVE_TRACING
 780   action->category = NULL;
 781 #endif
 782
 783   action->sleep.host = host;
 784   action->sleep.surf_sleep =
 785       surf_workstation_sleep(host, duration);
 786
 787   surf_action_set_data(action->sleep.surf_sleep, action);
 788   XBT_DEBUG("Create sleep action %p", action);
 789
 790   return action;
 791 }
 792
 793 void SIMIX_post_process_sleep(smx_action_t action)
 794 {
 795   smx_simcall_t simcall;
 796   e_smx_state_t state;
 797   xbt_assert(action->type == SIMIX_ACTION_SLEEP || action->type == SIMIX_ACTION_JOIN);
 798
 799   while ((simcall = xbt_fifo_shift(action->simcalls))) {
 800
 801     switch(surf_action_get_state(action->sleep.surf_sleep)){
 802       case SURF_ACTION_FAILED:
 803         simcall->issuer->context->iwannadie = 1;
 804         //SMX_EXCEPTION(simcall->issuer, host_error, 0, "Host failed");
 805         state = SIMIX_SRC_HOST_FAILURE;
 806         break;
 807
 808       case SURF_ACTION_DONE:
 809         state = SIMIX_DONE;
 810         break;
 811
 812       default:
 813         THROW_IMPOSSIBLE;
 814         break;
 815     }
 816     if (surf_resource_get_state(surf_workstation_resource_priv(simcall->issuer->smx_host)) != SURF_RESOURCE_ON) {
 817       simcall->issuer->context->iwannadie = 1;
 818     }
 819     simcall_process_sleep__set__result(simcall, state);
 820     simcall->issuer->waiting_action = NULL;
 821     if (simcall->issuer->suspended) {
 822       XBT_DEBUG("Wait! This process is suspended and can't wake up now.");
 823       simcall->issuer->suspended = 0;
 824       simcall_HANDLER_process_suspend(simcall, simcall->issuer);
 825     } else {
 826       SIMIX_simcall_answer(simcall);
 827     }
 828   }
 829
 830   SIMIX_process_sleep_destroy(action);
 831 }
 832
 833 void SIMIX_process_sleep_destroy(smx_action_t action)
 834 {
 835   XBT_DEBUG("Destroy action %p", action);
 836   xbt_assert(action->type == SIMIX_ACTION_SLEEP || action->type == SIMIX_ACTION_JOIN);
 837
 838   if (action->sleep.surf_sleep) {
 839     surf_action_unref(action->sleep.surf_sleep);
 840     action->sleep.surf_sleep = NULL;
 841   }
 842   if (action->type == SIMIX_ACTION_SLEEP)
 843     xbt_mallocator_release(simix_global->action_mallocator, action);
 844 }
 845
 846 void SIMIX_process_sleep_suspend(smx_action_t action)
 847 {
 848   xbt_assert(action->type == SIMIX_ACTION_SLEEP);
 849   surf_action_suspend(action->sleep.surf_sleep);
 850 }
 851
 852 void SIMIX_process_sleep_resume(smx_action_t action)
 853 {
 854   XBT_DEBUG("Action state is %d on process_sleep_resume.", action->state);
 855   xbt_assert(action->type == SIMIX_ACTION_SLEEP);
 856   surf_action_resume(action->sleep.surf_sleep);
 857 }
 858
 859 /**
 860  * \brief Calling this function makes the process to yield.
 861  *
 862  * Only the current process can call this function, giving back the control to
 863  * maestro.
 864  *
 865  * \param self the current process
 866  */
 867 void SIMIX_process_yield(smx_process_t self)
 868 {
 869   XBT_DEBUG("Yield process '%s'", self->name);
 870
 871   /* Go into sleep and return control to maestro */
 872   SIMIX_context_suspend(self->context);
 873
 874   /* Ok, maestro returned control to us */
 875   XBT_DEBUG("Control returned to me: '%s'", self->name);
 876
 877   if (self->new_host) {
 878     SIMIX_process_change_host(self, self->new_host);
 879     self->new_host = NULL;
 880   }
 881
 882   if (self->context->iwannadie){
 883     XBT_DEBUG("I wanna die!");
 884     SIMIX_process_stop(self);
 885   }
 886
 887   if (self->suspended) {
 888     XBT_DEBUG("Hey! I'm suspended.");
 889     xbt_assert(!self->doexception, "Gasp! This exception may be lost by subsequent calls.");
 890     self->suspended = 0;
 891     SIMIX_process_suspend(self, self);
 892   }
 893
 894   if (self->doexception) {
 895     XBT_DEBUG("Wait, maestro left me an exception");
 896     self->doexception = 0;
 897     SMX_THROW();
 898   }
 899
 900 }
 901
 902 /* callback: context fetching */
 903 xbt_running_ctx_t *SIMIX_process_get_running_context(void)
 904 {
 905   return SIMIX_process_self()->running_ctx;
 906 }
 907
 908 /* callback: termination */
 909 void SIMIX_process_exception_terminate(xbt_ex_t * e)
 910 {
 911   xbt_ex_display(e);
 912   xbt_abort();
 913 }
 914
 915 smx_context_t SIMIX_process_get_context(smx_process_t p) {
 916   return p->context;
 917 }
 918
 919 void SIMIX_process_set_context(smx_process_t p,smx_context_t c) {
 920   p->context = c;
 921 }
 922
 923 /**
 924  * \brief Returns the list of processes to run.
 925  */
 926 xbt_dynar_t SIMIX_process_get_runnable(void)
 927 {
 928   return simix_global->process_to_run;
 929 }
 930
 931 /**
 932  * \brief Returns the process from PID.
 933  */
 934 smx_process_t SIMIX_process_from_PID(int PID)
 935 {
 936   smx_process_t proc;
 937   xbt_swag_foreach(proc, simix_global->process_list)
 938   {
 939    if(proc->pid == PID)
 940    return proc;
 941   }
 942   return NULL;
 943 }
 944
 945 /** @brief returns a dynar containg all currently existing processes */
 946 xbt_dynar_t SIMIX_processes_as_dynar(void) {
 947   smx_process_t proc;
 948   xbt_dynar_t res = xbt_dynar_new(sizeof(smx_process_t),NULL);
 949   xbt_swag_foreach(proc, simix_global->process_list) {
 950     xbt_dynar_push(res,&proc);
 951   }
 952   return res;
 953 }
 954
 955
 956 void SIMIX_process_on_exit_runall(smx_process_t process) {
 957   s_smx_process_exit_fun_t exit_fun;
 958   smx_process_exit_status_t exit_status = (process->context->iwannadie) ?
 959                                          SMX_EXIT_FAILURE : SMX_EXIT_SUCCESS;
 960   while (!xbt_dynar_is_empty(process->on_exit)) {
 961     exit_fun = xbt_dynar_pop_as(process->on_exit,s_smx_process_exit_fun_t);
 962     (exit_fun.fun)((void*)exit_status, exit_fun.arg);
 963   }
 964 }
 965
 966 void simcall_HANDLER_process_on_exit(smx_simcall_t simcall, smx_process_t process,
 967                                int_f_pvoid_pvoid_t fun, void *data) {
 968   SIMIX_process_on_exit(process, fun, data);
 969 }
 970
 971 void SIMIX_process_on_exit(smx_process_t process, int_f_pvoid_pvoid_t fun, void *data) {
 972   xbt_assert(process, "current process not found: are you in maestro context ?");
 973
 974   if (!process->on_exit) {
 975     process->on_exit = xbt_dynar_new(sizeof(s_smx_process_exit_fun_t), NULL);
 976   }
 977
 978   s_smx_process_exit_fun_t exit_fun = {fun, data};
 979
 980   xbt_dynar_push_as(process->on_exit,s_smx_process_exit_fun_t,exit_fun);
 981 }
 982
 983 void simcall_HANDLER_process_auto_restart_set(smx_simcall_t simcall, smx_process_t process,
 984                                         int auto_restart) {
 985   SIMIX_process_auto_restart_set(process, auto_restart);
 986 }
 987 /**
 988  * \brief Sets the auto-restart status of the process.
 989  * If set to 1, the process will be automatically restarted when its host
 990  * comes back.
 991  */
 992 void SIMIX_process_auto_restart_set(smx_process_t process, int auto_restart) {
 993   process->auto_restart = auto_restart;
 994 }
 995
 996 smx_process_t simcall_HANDLER_process_restart(smx_simcall_t simcall, smx_process_t process) {
 997   return SIMIX_process_restart(process, simcall->issuer);
 998 }
 999 /**
1000  * \brief Restart a process.
1001  * Restart a process, starting it again from the beginning.
1002  */
1003 smx_process_t SIMIX_process_restart(smx_process_t process, smx_process_t issuer) {
1004   XBT_DEBUG("Restarting process %s on %s", process->name, sg_host_name(process->smx_host));
1005   //retrieve the arguments of the old process
1006   //FIXME: Factorise this with SIMIX_host_add_auto_restart_process ?
1007   s_smx_process_arg_t arg;
1008   arg.code = process->code;
1009   arg.hostname = sg_host_name(process->smx_host);
1010   arg.kill_time = process->kill_time;
1011   arg.argc = process->argc;
1012   arg.data = process->data;
1013   int i;
1014   arg.argv = xbt_new(char*,process->argc + 1);
1015   for (i = 0; i < arg.argc; i++) {
1016     arg.argv[i] = xbt_strdup(process->argv[i]);
1017   }
1018   arg.argv[process->argc] = NULL;
1019   arg.properties = NULL;
1020   arg.auto_restart = process->auto_restart;
1021   //kill the old process
1022   SIMIX_process_kill(process,issuer);
1023   //start the new process
1024   smx_process_t new_process;
1025   if (simix_global->create_process_function) {
1026     simix_global->create_process_function(&new_process,
1027                                           arg.argv[0],
1028                                           arg.code,
1029                                           arg.data,
1030                                           arg.hostname,
1031                                           arg.kill_time,
1032                                           arg.argc,
1033                                           arg.argv,
1034                                           arg.properties,
1035                                           arg.auto_restart,
1036                                           NULL);
1037   } else {
1038     simcall_process_create(&new_process,
1039                            arg.argv[0],
1040                            arg.code,
1041                            arg.data,
1042                            arg.hostname,
1043                            arg.kill_time,
1044                            arg.argc,
1045                            arg.argv,
1046                            arg.properties,
1047                            arg.auto_restart);
1048
1049   }
1050   return new_process;
1051 }