src/msg/msg_mailbox.c

   1 #include "mailbox.h"
   2 #include "msg/private.h"
   3
   4 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_mailbox, msg,
   5                                 "Logging specific to MSG (mailbox)");
   6
   7 static xbt_dict_t msg_mailboxes = NULL;
   8
   9 void MSG_mailbox_mod_init(void)
  10 {
  11   msg_mailboxes = xbt_dict_new();
  12 }
  13
  14 void MSG_mailbox_mod_exit(void)
  15 {
  16   xbt_dict_free(&msg_mailboxes);
  17 }
  18
  19 msg_mailbox_t MSG_mailbox_create(const char *alias)
  20 {
  21   msg_mailbox_t mailbox = xbt_new0(s_msg_mailbox_t, 1);
  22
  23   mailbox->tasks = xbt_fifo_new();
  24   mailbox->cond = NULL;
  25   mailbox->alias = alias ? xbt_strdup(alias) : NULL;
  26   mailbox->hostname = NULL;
  27
  28   return mailbox;
  29 }
  30
  31 msg_mailbox_t MSG_mailbox_new(const char *alias)
  32 {
  33   msg_mailbox_t mailbox = MSG_mailbox_create(alias);
  34
  35   /* add the mbox in the dictionary */
  36   xbt_dict_set(msg_mailboxes, alias, mailbox, MSG_mailbox_free);
  37
  38   return mailbox;
  39 }
  40
  41 void MSG_mailbox_free(void *mailbox)
  42 {
  43   msg_mailbox_t _mailbox = (msg_mailbox_t) mailbox;
  44
  45   if (_mailbox->hostname)
  46     free(_mailbox->hostname);
  47
  48   xbt_fifo_free(_mailbox->tasks);
  49   free(_mailbox->alias);
  50
  51   free(_mailbox);
  52 }
  53
  54 smx_cond_t MSG_mailbox_get_cond(msg_mailbox_t mailbox)
  55 {
  56   return mailbox->cond;
  57 }
  58
  59 void MSG_mailbox_remove(msg_mailbox_t mailbox, m_task_t task)
  60 {
  61   xbt_fifo_remove(mailbox->tasks, task);
  62 }
  63
  64 int MSG_mailbox_is_empty(msg_mailbox_t mailbox)
  65 {
  66   return (NULL == xbt_fifo_get_first_item(mailbox->tasks));
  67 }
  68
  69 m_task_t MSG_mailbox_pop_head(msg_mailbox_t mailbox)
  70 {
  71   return (m_task_t) xbt_fifo_shift(mailbox->tasks);
  72 }
  73
  74 m_task_t MSG_mailbox_get_head(msg_mailbox_t mailbox)
  75 {
  76   xbt_fifo_item_t item;
  77
  78   if (!(item = xbt_fifo_get_first_item(mailbox->tasks)))
  79     return NULL;
  80
  81   return (m_task_t) xbt_fifo_get_item_content(item);
  82 }
  83
  84
  85 m_task_t MSG_mailbox_get_first_host_task(msg_mailbox_t mailbox, m_host_t host)
  86 {
  87   m_task_t task = NULL;
  88   xbt_fifo_item_t item = NULL;
  89
  90   xbt_fifo_foreach(mailbox->tasks, item, task, m_task_t)
  91     if (task->simdata->source == host) {
  92     xbt_fifo_remove_item(mailbox->tasks, item);
  93     return task;
  94   }
  95
  96   return NULL;
  97 }
  98
  99 int
 100 MSG_mailbox_get_count_host_waiting_tasks(msg_mailbox_t mailbox, m_host_t host)
 101 {
 102   m_task_t task = NULL;
 103   xbt_fifo_item_t item = NULL;
 104   int count = 0;
 105
 106   xbt_fifo_foreach(mailbox->tasks, item, task, m_task_t) {
 107     if (task->simdata->source == host)
 108       count++;
 109   }
 110
 111   return count;
 112 }
 113
 114 void MSG_mailbox_set_cond(msg_mailbox_t mailbox, smx_cond_t cond)
 115 {
 116   mailbox->cond = cond;
 117 }
 118
 119 const char *MSG_mailbox_get_alias(msg_mailbox_t mailbox)
 120 {
 121   return mailbox->alias;
 122 }
 123
 124 const char *MSG_mailbox_get_hostname(msg_mailbox_t mailbox)
 125 {
 126   return mailbox->hostname;
 127 }
 128
 129 void MSG_mailbox_set_hostname(msg_mailbox_t mailbox, const char *hostname)
 130 {
 131   mailbox->hostname = xbt_strdup(hostname);
 132 }
 133
 134 msg_mailbox_t MSG_mailbox_get_by_alias(const char *alias)
 135 {
 136
 137   msg_mailbox_t mailbox = xbt_dict_get_or_null(msg_mailboxes, alias);
 138
 139   if (!mailbox) {
 140     mailbox = MSG_mailbox_new(alias);
 141     MSG_mailbox_set_hostname(mailbox, MSG_host_self()->name);
 142   }
 143
 144   return mailbox;
 145 }
 146
 147 msg_mailbox_t MSG_mailbox_get_by_channel(m_host_t host, m_channel_t channel)
 148 {
 149   xbt_assert0((host != NULL), "Invalid host");
 150   xbt_assert1((channel >= 0)
 151               && (channel < msg_global->max_channel), "Invalid channel %d",
 152               channel);
 153
 154   return host->simdata->mailboxes[(size_t) channel];
 155 }
 156
 157 MSG_error_t
 158 MSG_mailbox_get_task_ext(msg_mailbox_t mailbox, m_task_t * task,
 159                          m_host_t host, double timeout)
 160 {
 161   m_process_t process = MSG_process_self();
 162   m_task_t t = NULL;
 163   m_host_t h = NULL;
 164   simdata_task_t t_simdata = NULL;
 165   simdata_host_t h_simdata = NULL;
 166   double start_time = SIMIX_get_clock();
 167
 168   smx_cond_t cond = NULL;       //conditional wait if the task isn't on the channel yet
 169
 170   CHECK_HOST();
 171
 172   /* Sanity check */
 173   xbt_assert0(task, "Null pointer for the task storage");
 174
 175   if (*task)
 176     CRITICAL0
 177       ("MSG_task_get() was asked to write in a non empty task struct.");
 178
 179   /* Get the task */
 180   h = MSG_host_self();
 181   h_simdata = h->simdata;
 182
 183   SIMIX_mutex_lock(h_simdata->mutex);   //FIXME: lock the mailbox instead
 184
 185   if (MSG_mailbox_get_cond(mailbox)) {
 186     CRITICAL1
 187       ("A process is already blocked on the channel %s (meaning that someone is already doing a get on this)",
 188        MSG_mailbox_get_alias(mailbox));
 189     SIMIX_cond_display_info(MSG_mailbox_get_cond(mailbox));
 190     xbt_die("Go fix your code!");
 191   }
 192
 193   while (1) {
 194     /* if the mailbox is not empty (has a task) */
 195     if (!MSG_mailbox_is_empty(mailbox)) {
 196       if (!host) {
 197         /* pop the head of the mailbox */
 198         t = MSG_mailbox_pop_head(mailbox);
 199         break;
 200       } else {
 201         /* get the first task of the host */
 202         if ((t = MSG_mailbox_get_first_host_task(mailbox, host)))
 203           break;
 204       }
 205     }
 206
 207     if ((timeout > 0) && (SIMIX_get_clock() - start_time >= timeout)) { // Timeout already elapsed
 208       SIMIX_mutex_unlock(h_simdata->mutex);
 209       MSG_mailbox_set_cond(mailbox, NULL);
 210       SIMIX_cond_destroy(cond);
 211       MSG_RETURN(MSG_TRANSFER_FAILURE);
 212     }
 213
 214     if (!cond) {
 215       cond = SIMIX_cond_init();
 216       MSG_mailbox_set_cond(mailbox, cond);
 217     }
 218
 219     if (timeout > 0)
 220       SIMIX_cond_wait_timeout(cond, h_simdata->mutex,
 221                               timeout - start_time + SIMIX_get_clock());
 222     else
 223       SIMIX_cond_wait(cond, h_simdata->mutex);
 224
 225     if (SIMIX_host_get_state(h_simdata->smx_host) == 0) {
 226       SIMIX_mutex_unlock(h_simdata->mutex);
 227       MSG_mailbox_set_cond(mailbox, NULL);
 228       SIMIX_cond_destroy(cond);
 229       MSG_RETURN(MSG_HOST_FAILURE);
 230     }
 231   }
 232
 233
 234   DEBUG1("OK, got a task (%s)", t->name);
 235   /* clean conditional */
 236   if (cond) {
 237     MSG_mailbox_set_cond(mailbox, NULL);
 238     SIMIX_cond_destroy(cond);
 239   }
 240
 241   SIMIX_mutex_unlock(h_simdata->mutex);
 242
 243   t_simdata = t->simdata;
 244   t_simdata->receiver = process;
 245   *task = t;
 246
 247   SIMIX_mutex_lock(t_simdata->mutex);
 248
 249   /* Transfer */
 250   /* create SIMIX action to the communication */
 251   t_simdata->comm =
 252     SIMIX_action_communicate(t_simdata->sender->simdata->m_host->
 253                              simdata->smx_host,
 254                              process->simdata->m_host->simdata->smx_host,
 255                              t->name, t_simdata->message_size,
 256                              t_simdata->rate);
 257
 258   SIMIX_action_use(t_simdata->comm);
 259
 260   /* if the process is suspend, create the action but stop its execution, it will be restart when the sender process resume */
 261   if (MSG_process_is_suspended(t_simdata->sender)) {
 262     DEBUG1("Process sender (%s) suspended", t_simdata->sender->name);
 263     SIMIX_action_set_priority(t_simdata->comm, 0);
 264   }
 265   SIMIX_register_action_to_condition(t_simdata->comm, t_simdata->cond);
 266   // breaking point if asynchrounous
 267   process->simdata->waiting_action = t_simdata->comm;
 268
 269   while (1) {
 270     SIMIX_cond_wait(t_simdata->cond, t_simdata->mutex);
 271
 272     if (SIMIX_action_get_state(t_simdata->comm) != SURF_ACTION_RUNNING)
 273       break;
 274     if (!SIMIX_host_get_state(h_simdata->smx_host))
 275       break;
 276     if (!SIMIX_host_get_state(process->simdata->m_host->simdata->smx_host))
 277       break;
 278   }
 279
 280   SIMIX_unregister_action_to_condition(t_simdata->comm, t_simdata->cond);
 281   process->simdata->waiting_action = NULL;
 282
 283   /* for this process, don't need to change in get function */
 284   SIMIX_mutex_unlock(t_simdata->mutex);
 285
 286   if (SIMIX_action_get_state(t_simdata->comm) == SURF_ACTION_DONE) {
 287     if (SIMIX_action_destroy(t_simdata->comm))
 288       t_simdata->comm = NULL;
 289     MSG_RETURN(MSG_OK);
 290   } else if (SIMIX_host_get_state(h_simdata->smx_host) == 0) {
 291     if (SIMIX_action_destroy(t_simdata->comm))
 292       t_simdata->comm = NULL;
 293     MSG_RETURN(MSG_HOST_FAILURE);
 294   } else {
 295     if (SIMIX_action_destroy(t_simdata->comm))
 296       t_simdata->comm = NULL;
 297     MSG_RETURN(MSG_TRANSFER_FAILURE);
 298   }
 299 }
 300
 301 MSG_error_t
 302 MSG_mailbox_put_with_timeout(msg_mailbox_t mailbox, m_task_t task,
 303                              double timeout)
 304 {
 305   m_process_t process = MSG_process_self();
 306   const char *hostname;
 307   simdata_task_t t_simdata = NULL;
 308   m_host_t local_host = NULL;
 309   m_host_t remote_host = NULL;
 310   smx_cond_t cond = NULL;
 311
 312   CHECK_HOST();
 313
 314   t_simdata = task->simdata;
 315   t_simdata->sender = process;
 316   t_simdata->source = MSG_process_get_host(process);
 317
 318   xbt_assert0(t_simdata->refcount == 1,
 319               "This task is still being used somewhere else. You cannot send it now. Go fix your code!");
 320
 321   t_simdata->comm = NULL;
 322
 323   t_simdata->refcount++;
 324   local_host = ((simdata_process_t) process->simdata)->m_host;
 325   msg_global->sent_msg++;
 326
 327   /* get the host name containing the mailbox */
 328   hostname = MSG_mailbox_get_hostname(mailbox);
 329
 330   remote_host = MSG_get_host_by_name(hostname);
 331
 332   if (!remote_host)
 333     THROW1(not_found_error, 0, "Host %s not fount", hostname);
 334
 335
 336   DEBUG4("Trying to send a task (%g kB) from %s to %s on the channel %s",
 337          t_simdata->message_size / 1000, local_host->name,
 338          remote_host->name, MSG_mailbox_get_alias(mailbox));
 339
 340   SIMIX_mutex_lock(remote_host->simdata->mutex);        /* FIXME: lock the mailbox instead */
 341
 342   /* put the task in the mailbox */
 343   xbt_fifo_push(mailbox->tasks, task);
 344
 345   if ((cond = MSG_mailbox_get_cond(mailbox))) {
 346     DEBUG0("Somebody is listening. Let's wake him up!");
 347     SIMIX_cond_signal(cond);
 348   }
 349
 350   SIMIX_mutex_unlock(remote_host->simdata->mutex);
 351
 352   SIMIX_mutex_lock(t_simdata->mutex);
 353
 354   process->simdata->waiting_action = t_simdata->comm;   // for debugging and status displaying purpose
 355
 356   if (timeout > 0) {
 357     xbt_ex_t e;
 358     double time;
 359     double time_elapsed;
 360     time = SIMIX_get_clock();
 361
 362     TRY {
 363       /*verify if the action that ends is the correct. Call the wait_timeout with the new time. If the timeout occurs, an exception is raised */
 364       while (1) {
 365         time_elapsed = SIMIX_get_clock() - time;
 366         SIMIX_cond_wait_timeout(t_simdata->cond, t_simdata->mutex,
 367                                 timeout - time_elapsed);
 368
 369         if (t_simdata->comm)
 370           SIMIX_action_use(t_simdata->comm);
 371         if (t_simdata->comm && (SIMIX_action_get_state(t_simdata->comm) !=
 372                                 SURF_ACTION_RUNNING))
 373           break;
 374         if (!SIMIX_host_get_state(local_host->simdata->smx_host))
 375           break;
 376         if (!SIMIX_host_get_state(remote_host->simdata->smx_host))
 377           break;
 378       }
 379     }
 380     CATCH(e) {
 381       if (e.category == timeout_error) {
 382         xbt_ex_free(e);
 383         /* verify if the timeout happened and the communication didn't started yet */
 384         if (t_simdata->comm == NULL) {
 385           DEBUG1("Action terminated %s (there was a timeout)", task->name);
 386           process->simdata->waiting_action = NULL;
 387
 388           /* remove the task from the mailbox */
 389           MSG_mailbox_remove(mailbox, task);
 390
 391 /*           if (t_simdata->receiver && t_simdata->receiver->simdata) {    /\* receiver still around *\/ */
 392 /*             t_simdata->receiver->simdata->waiting_task = NULL; */
 393 /*           } */
 394
 395           SIMIX_mutex_unlock(t_simdata->mutex);
 396           MSG_RETURN(MSG_TRANSFER_FAILURE);
 397         }
 398       } else {
 399         RETHROW;
 400       }
 401     }
 402   } else {
 403     while (1) {                 //FIXME: factorize with the code right above
 404       SIMIX_cond_wait(t_simdata->cond, t_simdata->mutex);
 405
 406       if (t_simdata->comm)
 407         SIMIX_action_use(t_simdata->comm);
 408       if (t_simdata->comm
 409           && SIMIX_action_get_state(t_simdata->comm) != SURF_ACTION_RUNNING)
 410         break;
 411       if (!SIMIX_host_get_state(local_host->simdata->smx_host))
 412         break;
 413       if (!SIMIX_host_get_state(remote_host->simdata->smx_host))
 414         break;
 415     }
 416   }
 417
 418   DEBUG1("Action terminated %s", task->name);
 419   process->simdata->waiting_action = NULL;
 420 /*   if (t_simdata->receiver && t_simdata->receiver->simdata) {    /\* receiver still around *\/ */
 421 /*     t_simdata->receiver->simdata->waiting_task = NULL; */
 422 /*   } */
 423
 424   SIMIX_mutex_unlock(t_simdata->mutex);
 425
 426   if (t_simdata->comm
 427       && SIMIX_action_get_state(t_simdata->comm) == SURF_ACTION_DONE) {
 428     if (SIMIX_action_destroy(t_simdata->comm))
 429       t_simdata->comm = NULL;
 430     t_simdata->refcount--;
 431     MSG_RETURN(MSG_OK);
 432   } else if (SIMIX_host_get_state(local_host->simdata->smx_host) == 0) {
 433     if (t_simdata->comm && SIMIX_action_destroy(t_simdata->comm))
 434       t_simdata->comm = NULL;
 435     MSG_RETURN(MSG_HOST_FAILURE);
 436   } else {
 437     if (t_simdata->comm && SIMIX_action_destroy(t_simdata->comm))
 438       t_simdata->comm = NULL;
 439     MSG_RETURN(MSG_TRANSFER_FAILURE);
 440   }
 441 }