src/simix/smx_process.c

   1 /* Copyright (c) 2007, 2008, 2009, 2010. 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 "private.h"
   8 #include "xbt/sysdep.h"
   9 #include "xbt/log.h"
  10 #include "xbt/dict.h"
  11 #include "msg/mailbox.h"
  12 #include "mc/mc.h"
  13
  14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_process, simix,
  15                                 "Logging specific to SIMIX (process)");
  16
  17 static unsigned long simix_process_count = 0;
  18
  19 /**
  20  * \brief Returns the current agent.
  21  *
  22  * This functions returns the currently running SIMIX process.
  23  *
  24  * \return The SIMIX process
  25  */
  26 XBT_INLINE smx_process_t SIMIX_process_self(void)
  27 {
  28   smx_context_t self_context = SIMIX_context_self();
  29
  30   return self_context ? SIMIX_context_get_data(self_context) : NULL;
  31 }
  32
  33 /**
  34  * \brief Move a process to the list of processes to destroy.
  35  */
  36 void SIMIX_process_cleanup(smx_process_t process)
  37 {
  38   DEBUG1("Cleanup process %s", process->name);
  39   xbt_swag_remove(process, simix_global->process_to_run);
  40   xbt_swag_remove(process, simix_global->process_list);
  41   xbt_swag_remove(process, process->smx_host->process_list);
  42   xbt_swag_insert(process, simix_global->process_to_destroy);
  43 }
  44
  45 /**
  46  * Garbage collection
  47  *
  48  * Should be called some time to time to free the memory allocated for processes
  49  * that have finished (or killed).
  50  */
  51 void SIMIX_process_empty_trash(void)
  52 {
  53   smx_process_t process = NULL;
  54
  55   while ((process = xbt_swag_extract(simix_global->process_to_destroy))) {
  56     SIMIX_context_free(process->context);
  57
  58     /* Free the exception allocated at creation time */
  59     if (process->running_ctx)
  60       free(process->running_ctx);
  61     if (process->properties)
  62       xbt_dict_free(&process->properties);
  63
  64     free(process->name);
  65     process->name = NULL;
  66     free(process);
  67   }
  68 }
  69
  70 /**
  71  * \brief Creates and runs the maestro process
  72  */
  73 void SIMIX_create_maestro_process()
  74 {
  75   smx_process_t maestro = NULL;
  76
  77   /* Create maestro process and intilialize it */
  78   maestro = xbt_new0(s_smx_process_t, 1);
  79   maestro->pid = simix_process_count++;
  80   maestro->name = (char *) "";
  81   maestro->running_ctx = xbt_new(xbt_running_ctx_t, 1);
  82   XBT_RUNNING_CTX_INITIALIZE(maestro->running_ctx);
  83   maestro->context = SIMIX_context_new(NULL, 0, NULL, NULL, maestro);
  84
  85   simix_global->maestro_process = maestro;
  86   return;
  87 }
  88
  89 /**
  90  * \brief Same as SIMIX_process_create() but with only one argument (used by timers).
  91  * \return the process created
  92  */
  93 smx_process_t SIMIX_process_create_from_wrapper(smx_process_arg_t args) {
  94
  95   smx_process_t process;
  96
  97   if (simix_global->create_process_function) {
  98     process = simix_global->create_process_function(args->name,
  99         args->code,
 100         args->data,
 101         args->hostname,
 102         args->argc,
 103         args->argv,
 104         args->properties);
 105   }
 106   else {
 107     process = SIMIX_process_create(args->name,
 108         args->code,
 109         args->data,
 110         args->hostname,
 111         args->argc,
 112         args->argv,
 113         args->properties);
 114   }
 115   // FIXME: to simplify this, simix_global->create_process_function could just
 116   // be SIMIX_process_create() by default (and the same thing in smx_deployment.c)
 117
 118   return process;
 119 }
 120
 121 /**
 122  * \brief Internal function to create a process.
 123  *
 124  * This function actually creates the process.
 125  * It may be called when a REQ_PROCESS_CREATE request occurs,
 126  * or directly for SIMIX internal purposes.
 127  *
 128  * \return the process created
 129  */
 130 smx_process_t SIMIX_process_create(const char *name,
 131                                    xbt_main_func_t code,
 132                                    void *data,
 133                                    const char *hostname,
 134                                    int argc, char **argv,
 135                                    xbt_dict_t properties) {
 136
 137   smx_process_t process = NULL;
 138   smx_host_t host = SIMIX_host_get_by_name(hostname);
 139
 140   DEBUG2("Start process %s on host %s", name, hostname);
 141
 142   if (!SIMIX_host_get_state(host)) {
 143     WARN2("Cannot launch process '%s' on failed host '%s'", name,
 144           hostname);
 145   }
 146   else {
 147     process = xbt_new0(s_smx_process_t, 1);
 148
 149     xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
 150
 151     /* Process data */
 152     process->pid = simix_process_count++;
 153     process->name = xbt_strdup(name);
 154     process->smx_host = host;
 155     process->data = data;
 156
 157     VERB1("Create context %s", process->name);
 158     process->context = SIMIX_context_new(code, argc, argv,
 159         simix_global->cleanup_process_function, process);
 160
 161     process->running_ctx = xbt_new(xbt_running_ctx_t, 1);
 162     XBT_RUNNING_CTX_INITIALIZE(process->running_ctx);
 163
 164     /* Add properties */
 165     process->properties = properties;
 166
 167     /* Add the process to it's host process list */
 168     xbt_swag_insert(process, host->process_list);
 169
 170     DEBUG1("Start context '%s'", process->name);
 171
 172     /* Now insert it in the global process list and in the process to run list */
 173     xbt_swag_insert(process, simix_global->process_list);
 174     DEBUG2("Inserting %s(%s) in the to_run list", process->name, host->name);
 175     xbt_swag_insert(process, simix_global->process_to_run);
 176   }
 177
 178   return process;
 179 }
 180
 181 /**
 182  * \brief Internal function to kill a SIMIX process.
 183  *
 184  * This function may be called when a REQ_PROCESS_KILL request occurs,
 185  * or directly for SIMIX internal purposes.
 186  *
 187  * \param process poor victim
 188  */
 189 void SIMIX_process_kill(smx_process_t process, smx_process_t killer) {
 190
 191   DEBUG2("Killing process %s on %s", process->name, process->smx_host->name);
 192
 193   process->context->iwannadie = 1;
 194   process->blocked = 0;
 195   process->suspended = 0;
 196   /* FIXME: set doexception to 0 also? */
 197
 198   if (process->waiting_action) {
 199
 200     switch (process->waiting_action->type) {
 201
 202       case SIMIX_ACTION_EXECUTE:
 203       case SIMIX_ACTION_PARALLEL_EXECUTE:
 204         SIMIX_host_execution_destroy(process->waiting_action);
 205         break;
 206
 207       case SIMIX_ACTION_COMMUNICATE:
 208         SIMIX_comm_destroy(process->waiting_action);
 209         break;
 210
 211       case SIMIX_ACTION_SLEEP:
 212         SIMIX_process_sleep_destroy(process->waiting_action);
 213         break;
 214
 215       case SIMIX_ACTION_SYNCHRO:
 216         SIMIX_synchro_stop_waiting(process, process->request);
 217         SIMIX_synchro_destroy(process->waiting_action);
 218         break;
 219
 220       case SIMIX_ACTION_IO:
 221         THROW_UNIMPLEMENTED;
 222         break;
 223     }
 224   }
 225
 226   /* If I'm killing myself then stop, otherwise schedule the process to kill. */
 227   if (process == killer) {
 228     SIMIX_context_stop(process->context);
 229   }
 230   else {
 231     xbt_swag_insert(process, simix_global->process_to_run);
 232   }
 233 }
 234
 235 /**
 236  * \brief Kills all running processes.
 237  *
 238  * Only maestro can kill everyone.
 239  */
 240 void SIMIX_process_killall(void)
 241 {
 242   smx_process_t p = NULL;
 243
 244   while ((p = xbt_swag_extract(simix_global->process_list)))
 245     SIMIX_process_kill(p, SIMIX_process_self());
 246
 247   SIMIX_process_empty_trash();
 248 }
 249
 250 void SIMIX_process_change_host(smx_process_t process,
 251     const char *source, const char *dest)
 252 {
 253   smx_host_t h1 = NULL;
 254   smx_host_t h2 = NULL;
 255   xbt_assert0((process != NULL), "Invalid parameters");
 256   h1 = SIMIX_host_get_by_name(source);
 257   h2 = SIMIX_host_get_by_name(dest);
 258   process->smx_host = h2;
 259   xbt_swag_remove(process, h1->process_list);
 260   xbt_swag_insert(process, h2->process_list);
 261 }
 262
 263 void SIMIX_pre_process_suspend(smx_req_t req)
 264 {
 265   smx_process_t process = req->process_suspend.process;
 266   SIMIX_process_suspend(process, req->issuer);
 267
 268   if (process != req->issuer) {
 269     SIMIX_request_answer(req);
 270   }
 271   /* If we are suspending ourselves, then just do not replay the request. */
 272 }
 273
 274 void SIMIX_process_suspend(smx_process_t process, smx_process_t issuer)
 275 {
 276   xbt_assert0(process, "Invalid parameters");
 277
 278   process->suspended = 1;
 279
 280   /* If we are suspending another process, and it is waiting on an action,
 281      suspend it's action. */
 282   if (process != issuer) {
 283
 284     if (process->waiting_action) {
 285
 286       switch (process->waiting_action->type) {
 287
 288         case SIMIX_ACTION_EXECUTE:
 289         case SIMIX_ACTION_PARALLEL_EXECUTE:
 290           SIMIX_host_execution_suspend(process->waiting_action);
 291           break;
 292
 293         case SIMIX_ACTION_COMMUNICATE:
 294           SIMIX_comm_suspend(process->waiting_action);
 295           break;
 296
 297         case SIMIX_ACTION_SLEEP:
 298           SIMIX_process_sleep_suspend(process->waiting_action);
 299           break;
 300
 301         default:
 302           THROW_IMPOSSIBLE;
 303       }
 304     }
 305   }
 306 }
 307
 308 void SIMIX_process_resume(smx_process_t process, smx_process_t issuer)
 309 {
 310   xbt_assert0((process != NULL), "Invalid parameters");
 311
 312   process->suspended = 0;
 313
 314   /* If we are resuming another process, resume the action it was waiting for
 315      if any. Otherwise add it to the list of process to run in the next round. */
 316   if (process != issuer) {
 317
 318     if (process->waiting_action) {
 319
 320       switch (process->waiting_action->type) {
 321
 322         case SIMIX_ACTION_EXECUTE:
 323         case SIMIX_ACTION_PARALLEL_EXECUTE:
 324           SIMIX_host_execution_resume(process->waiting_action);
 325           break;
 326
 327         case SIMIX_ACTION_COMMUNICATE:
 328           SIMIX_comm_resume(process->waiting_action);
 329           break;
 330
 331         case SIMIX_ACTION_SLEEP:
 332           SIMIX_process_sleep_resume(process->waiting_action);
 333           break;
 334
 335         default:
 336           THROW_IMPOSSIBLE;
 337       }
 338     }
 339     else {
 340       xbt_swag_insert(process, simix_global->process_to_run);
 341     }
 342   }
 343 }
 344
 345 int SIMIX_process_count(void)
 346 {
 347   return xbt_swag_size(simix_global->process_list);
 348 }
 349
 350 void* SIMIX_process_self_get_data(void)
 351 {
 352   smx_process_t me = SIMIX_process_self();
 353   if (!me) {
 354     return NULL;
 355   }
 356   return SIMIX_process_get_data(me);
 357 }
 358
 359 void SIMIX_process_self_set_data(void *data)
 360 {
 361   SIMIX_process_set_data(SIMIX_process_self(), data);
 362 }
 363
 364 void* SIMIX_process_get_data(smx_process_t process)
 365 {
 366   return process->data;
 367 }
 368
 369 void SIMIX_process_set_data(smx_process_t process, void *data)
 370 {
 371   process->data = data;
 372 }
 373
 374 smx_host_t SIMIX_process_get_host(smx_process_t process)
 375 {
 376   return process->smx_host;
 377 }
 378
 379 /* needs to be public and without request because it is called
 380    by exceptions and logging events */
 381 const char* SIMIX_process_self_get_name(void) {
 382
 383   smx_process_t process = SIMIX_process_self();
 384   if (process == NULL || process == simix_global->maestro_process)
 385     return "";
 386
 387   return SIMIX_process_get_name(process);
 388 }
 389
 390 const char* SIMIX_process_get_name(smx_process_t process)
 391 {
 392   return process->name;
 393 }
 394
 395 int SIMIX_process_is_suspended(smx_process_t process)
 396 {
 397   return process->suspended;
 398 }
 399
 400 int SIMIX_process_is_enabled(smx_process_t process)
 401 {
 402   if (process->request && SIMIX_request_is_enabled(process->request))
 403     return TRUE;
 404
 405   return FALSE;
 406 }
 407
 408 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
 409 {
 410   return process->properties;
 411 }
 412
 413 void SIMIX_pre_process_sleep(smx_req_t req)
 414 {
 415   if (MC_IS_ENABLED) {
 416     req->process_sleep.result = SIMIX_DONE;
 417     SIMIX_request_answer(req);
 418   }
 419   smx_action_t action = SIMIX_process_sleep(req->issuer, req->process_sleep.duration);
 420   xbt_fifo_push(action->request_list, req);
 421   req->issuer->waiting_action = action;
 422 }
 423
 424 smx_action_t SIMIX_process_sleep(smx_process_t process, double duration)
 425 {
 426   smx_action_t action;
 427   smx_host_t host = process->smx_host;
 428
 429   /* check if the host is active */
 430   if (surf_workstation_model->extension.
 431       workstation.get_state(host->host) != SURF_RESOURCE_ON) {
 432     THROW1(host_error, 0, "Host %s failed, you cannot call this function",
 433            host->name);
 434   }
 435
 436   action = xbt_new0(s_smx_action_t, 1);
 437   action->type = SIMIX_ACTION_SLEEP;
 438   action->request_list = xbt_fifo_new();
 439   action->name = xbt_strdup("sleep");
 440 #ifdef HAVE_TRACING
 441   action->category = NULL;
 442 #endif
 443
 444   action->sleep.host = host;
 445   action->sleep.surf_sleep =
 446       surf_workstation_model->extension.workstation.sleep(host->host, duration);
 447
 448   surf_workstation_model->action_data_set(action->sleep.surf_sleep, action);
 449   DEBUG1("Create sleep action %p", action);
 450
 451   return action;
 452 }
 453
 454 void SIMIX_post_process_sleep(smx_action_t action)
 455 {
 456   e_smx_state_t state = SIMIX_action_map_state(surf_workstation_model->action_state_get(action->sleep.surf_sleep));
 457   smx_req_t req;
 458
 459   while ((req = xbt_fifo_shift(action->request_list))) {
 460     req->process_sleep.result = state;
 461     req->issuer->waiting_action = NULL;
 462     SIMIX_request_answer(req);
 463   }
 464
 465   SIMIX_process_sleep_destroy(action);
 466 }
 467
 468 void SIMIX_process_sleep_destroy(smx_action_t action)
 469 {
 470   DEBUG1("Destroy action %p", action);
 471   if (action->name)
 472     xbt_free(action->name);
 473   if (action->sleep.surf_sleep)
 474     action->sleep.surf_sleep->model_type->action_unref(action->sleep.surf_sleep);
 475 #ifdef HAVE_TRACING
 476   TRACE_smx_action_destroy(action);
 477 #endif
 478   xbt_fifo_free(action->request_list);
 479   xbt_free(action);
 480 }
 481
 482 void SIMIX_process_sleep_suspend(smx_action_t action)
 483 {
 484   surf_workstation_model->suspend(action->sleep.surf_sleep);
 485 }
 486
 487 void SIMIX_process_sleep_resume(smx_action_t action)
 488 {
 489   surf_workstation_model->resume(action->sleep.surf_sleep);
 490 }
 491
 492 /**
 493  * Calling this function makes the process to yield.
 494  * Only the processes can call this function, giving back the control to maestro
 495  */
 496 void SIMIX_process_yield(void)
 497 {
 498   smx_process_t self = SIMIX_process_self();
 499
 500   DEBUG1("Yield process '%s'", self->name);
 501
 502   /* Go into sleep and return control to maestro */
 503   SIMIX_context_suspend(self->context);
 504
 505   /* Ok, maestro returned control to us */
 506   DEBUG1("Maestro returned control to me: '%s'", self->name);
 507
 508   if (self->context->iwannadie)
 509     SIMIX_context_stop(self->context);
 510
 511   if (self->doexception) {
 512     DEBUG0("Wait, maestro left me an exception");
 513     self->doexception = 0;
 514     RETHROW;
 515   }
 516 }
 517
 518 /* callback: context fetching */
 519 xbt_running_ctx_t *SIMIX_process_get_running_context(void)
 520 {
 521   return SIMIX_process_self()->running_ctx;
 522 }
 523
 524 /* callback: termination */
 525 void SIMIX_process_exception_terminate(xbt_ex_t * e)
 526 {
 527   xbt_ex_display(e);
 528   abort();
 529 }
 530
 531 smx_context_t SIMIX_process_get_context(smx_process_t p) {
 532   return p->context;
 533 }
 534 void SIMIX_process_set_context(smx_process_t p,smx_context_t c) {
 535   p->context = c;
 536 }