3 /* Copyright (c) 2002,2003,2004 Arnaud Legrand. All rights reserved. */
5 /* This program is free software; you can redistribute it and/or modify it
6 * under the terms of the license (GNU LGPL) which comes with this package. */
9 #include "xbt/sysdep.h"
11 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(gos, msg,
12 "Logging specific to MSG (gos)");
14 /** \defgroup msg_gos_functions MSG Operating System Functions
15 * \brief This section describes the functions that can be used
16 * by an agent for handling some task.
19 /** \ingroup msg_gos_functions
20 * \brief Listen on a channel and wait for receiving a task.
22 * It takes two parameters.
23 * \param task a memory location for storing a #m_task_t. It will
24 hold a task when this function will return. Thus \a task should not
25 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
26 those two condition does not hold, there will be a warning message.
27 * \param channel the channel on which the agent should be
28 listening. This value has to be >=0 and < than the maximal
29 number of channels fixed with MSG_set_channel_number().
30 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
31 * if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
33 MSG_error_t MSG_task_get(m_task_t * task,
36 return MSG_task_get_with_time_out(task, channel, -1);
39 /** \ingroup msg_gos_functions
40 * \brief Listen on a channel and wait for receiving a task with a timeout.
42 * It takes three parameters.
43 * \param task a memory location for storing a #m_task_t. It will
44 hold a task when this function will return. Thus \a task should not
45 be equal to \c NULL and \a *task should be equal to \c NULL. If one of
46 those two condition does not hold, there will be a warning message.
47 * \param channel the channel on which the agent should be
48 listening. This value has to be >=0 and < than the maximal
49 number of channels fixed with MSG_set_channel_number().
50 * \param max_duration the maximum time to wait for a task before giving
51 up. In such a case, \a task will not be modified and will still be
52 equal to \c NULL when returning.
53 * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING
54 if \a *task is not equal to \c NULL, and #MSG_OK otherwise.
57 MSG_error_t MSG_task_get_with_time_out(m_task_t * task,
61 m_process_t process = MSG_process_self();
64 simdata_task_t t_simdata = NULL;
65 simdata_host_t h_simdata = NULL;
67 e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
71 xbt_assert0(task,"Null pointer for the task\n");
74 CRITICAL0("MSG_task_get() was asked to write in a non empty task struct.");
78 h_simdata = h->simdata;
80 DEBUG2("Waiting for a task on channel %d (%s)", channel,h->name);
82 while ((t = xbt_fifo_shift(h_simdata->mbox[channel])) == NULL) {
88 xbt_assert2(!(h_simdata->sleeping[channel]),
89 "A process (%s(%d)) is already blocked on this channel",
90 h_simdata->sleeping[channel]->name,
91 h_simdata->sleeping[channel]->simdata->PID);
92 h_simdata->sleeping[channel] = process; /* I'm waiting. Wake me up when you're ready */
94 __MSG_process_block(max_duration);
96 __MSG_process_block(-1);
98 if(surf_workstation_resource->extension_public->get_state(h_simdata->host)
100 MSG_RETURN(MSG_HOST_FAILURE);
101 h_simdata->sleeping[channel] = NULL;
103 /* OK, we should both be ready now. Are you there ? */
106 t_simdata = t->simdata;
107 /* *task = __MSG_task_copy(t); */
113 t_simdata->comm = surf_workstation_resource->extension_public->
114 communicate(MSG_process_get_host(t_simdata->sender)->simdata->host,
115 h->simdata->host, t_simdata->message_size,t_simdata->rate);
117 surf_workstation_resource->common_public->action_set_data(t_simdata->comm,t);
119 if(__MSG_process_isBlocked(t_simdata->sender))
120 __MSG_process_unblock(t_simdata->sender);
122 PAJE_PROCESS_PUSH_STATE(process,"C");
125 __MSG_task_wait_event(process, t);
126 state=surf_workstation_resource->common_public->action_get_state(t_simdata->comm);
127 } while (state==SURF_ACTION_RUNNING);
129 if(t->simdata->using>1) {
130 xbt_fifo_unshift(msg_global->process_to_run,process);
134 PAJE_PROCESS_POP_STATE(process);
135 PAJE_COMM_STOP(process,t,channel);
137 if(state == SURF_ACTION_DONE) {
138 if(surf_workstation_resource->common_public->action_free(t_simdata->comm))
139 t_simdata->comm = NULL;
141 } else if(surf_workstation_resource->extension_public->get_state(h_simdata->host)
143 if(surf_workstation_resource->common_public->action_free(t_simdata->comm))
144 t_simdata->comm = NULL;
145 MSG_RETURN(MSG_HOST_FAILURE);
147 if(surf_workstation_resource->common_public->action_free(t_simdata->comm))
148 t_simdata->comm = NULL;
149 MSG_RETURN(MSG_TRANSFER_FAILURE);
153 /** \ingroup msg_gos_functions
154 * \brief Test whether there is a pending communication on a channel.
156 * It takes one parameter.
157 * \param channel the channel on which the agent should be
158 listening. This value has to be >=0 and < than the maximal
159 number of channels fixed with MSG_set_channel_number().
160 * \return 1 if there is a pending communication and 0 otherwise
162 int MSG_task_Iprobe(m_channel_t channel)
165 simdata_host_t h_simdata = NULL;
167 DEBUG2("Probing on channel %d (%s)", channel,h->name);
170 h_simdata = h->simdata;
171 return(xbt_fifo_get_first_item(h_simdata->mbox[channel])!=NULL);
174 /** \ingroup msg_gos_functions
175 * \brief Test whether there is a pending communication on a channel, and who sent it.
177 * It takes one parameter.
178 * \param channel the channel on which the agent should be
179 listening. This value has to be >=0 and < than the maximal
180 number of channels fixed with MSG_set_channel_number().
181 * \return -1 if there is no pending communication and the PID of the process who sent it otherwise
183 int MSG_task_probe_from(m_channel_t channel)
186 simdata_host_t h_simdata = NULL;
187 xbt_fifo_item_t item;
192 h_simdata = h->simdata;
194 DEBUG2("Probing on channel %d (%s)", channel,h->name);
196 item = xbt_fifo_get_first_item(h->simdata->mbox[channel]);
197 if (!item || !(t = xbt_fifo_get_item_content(item)))
200 return MSG_process_get_PID(t->simdata->sender);
203 MSG_error_t MSG_channel_select_from(m_channel_t channel, double max_duration,
207 simdata_host_t h_simdata = NULL;
208 xbt_fifo_item_t item;
211 m_process_t process = MSG_process_self();
217 if(max_duration==0.0) {
218 return MSG_task_probe_from(channel);
222 h_simdata = h->simdata;
224 DEBUG2("Probing on channel %d (%s)", channel,h->name);
225 while(!(item = xbt_fifo_get_first_item(h->simdata->mbox[channel]))) {
231 xbt_assert2(!(h_simdata->sleeping[channel]),
232 "A process (%s(%d)) is already blocked on this channel",
233 h_simdata->sleeping[channel]->name,
234 h_simdata->sleeping[channel]->simdata->PID);
235 h_simdata->sleeping[channel] = process; /* I'm waiting. Wake me up when you're ready */
237 __MSG_process_block(max_duration);
239 __MSG_process_block(-1);
241 if(surf_workstation_resource->extension_public->get_state(h_simdata->host)
243 MSG_RETURN(MSG_HOST_FAILURE);
245 h_simdata->sleeping[channel] = NULL;
248 if (!item || !(t = xbt_fifo_get_item_content(item))) {
252 *PID = MSG_process_get_PID(t->simdata->sender);
257 /** \ingroup msg_gos_functions
258 * \brief Put a task on a channel of an host and waits for the end of the
261 * This function is used for describing the behavior of an agent. It
262 * takes three parameter.
263 * \param task a #m_task_t to send on another location. This task
264 will not be usable anymore when the function will return. There is
265 no automatic task duplication and you have to save your parameters
266 before calling this function. Tasks are unique and once it has been
267 sent to another location, you should not access it anymore. You do
268 not need to call MSG_task_destroy() but to avoid using, as an
269 effect of inattention, this task anymore, you definitely should
270 renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task
271 can be transfered iff it has been correctly created with
273 * \param dest the destination of the message
274 * \param channel the channel on which the agent should put this
275 task. This value has to be >=0 and < than the maximal number of
276 channels fixed with MSG_set_channel_number().
277 * \return #MSG_FATAL if \a task is not properly initialized and
280 MSG_error_t MSG_task_put(m_task_t task,
281 m_host_t dest, m_channel_t channel)
283 m_process_t process = MSG_process_self();
284 simdata_task_t task_simdata = NULL;
285 e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
286 m_host_t local_host = NULL;
287 m_host_t remote_host = NULL;
291 task_simdata = task->simdata;
292 task_simdata->sender = process;
293 xbt_assert0(task_simdata->using==1,"Gargl!");
294 task_simdata->comm = NULL;
296 local_host = ((simdata_process_t) process->simdata)->host;
299 DEBUG4("Trying to send a task (%g Mb) from %s to %s on channel %d",
300 task->simdata->message_size,local_host->name, remote_host->name, channel);
302 xbt_fifo_push(((simdata_host_t) remote_host->simdata)->
303 mbox[channel], task);
305 PAJE_COMM_START(process,task,channel);
307 if(remote_host->simdata->sleeping[channel])
308 __MSG_process_unblock(remote_host->simdata->sleeping[channel]);
310 process->simdata->put_host = dest;
311 process->simdata->put_channel = channel;
312 while(!(task_simdata->comm))
313 __MSG_process_block(-1);
314 surf_workstation_resource->common_public->action_use(task_simdata->comm);
315 process->simdata->put_host = NULL;
316 process->simdata->put_channel = -1;
319 PAJE_PROCESS_PUSH_STATE(process,"C");
321 state=surf_workstation_resource->common_public->action_get_state(task_simdata->comm);
322 while (state==SURF_ACTION_RUNNING) {
323 __MSG_task_wait_event(process, task);
324 state=surf_workstation_resource->common_public->action_get_state(task_simdata->comm);
328 PAJE_PROCESS_POP_STATE(process);
330 if(state == SURF_ACTION_DONE) {
331 if(surf_workstation_resource->common_public->action_free(task_simdata->comm))
332 task_simdata->comm = NULL;
333 MSG_task_destroy(task);
335 } else if(surf_workstation_resource->extension_public->get_state(local_host->simdata->host)
337 if(surf_workstation_resource->common_public->action_free(task_simdata->comm))
338 task_simdata->comm = NULL;
339 MSG_task_destroy(task);
340 MSG_RETURN(MSG_HOST_FAILURE);
342 if(surf_workstation_resource->common_public->action_free(task_simdata->comm))
343 task_simdata->comm = NULL;
344 MSG_task_destroy(task);
345 MSG_RETURN(MSG_TRANSFER_FAILURE);
349 /** \ingroup msg_gos_functions
350 * \brief Does exactly the same as MSG_task_put but with a bounded transmition
355 MSG_error_t MSG_task_put_bounded(m_task_t task,
356 m_host_t dest, m_channel_t channel,
359 MSG_error_t res = MSG_OK;
360 task->simdata->rate=max_rate;
361 res = MSG_task_put(task, dest, channel);
362 task->simdata->rate=-1.0;
366 /** \ingroup msg_gos_functions
367 * \brief Executes a task and waits for its termination.
369 * This function is used for describing the behavior of an agent. It
370 * takes only one parameter.
371 * \param task a #m_task_t to execute on the location on which the
373 * \return #MSG_FATAL if \a task is not properly initialized and
376 MSG_error_t MSG_task_execute(m_task_t task)
378 m_process_t process = MSG_process_self();
381 DEBUG1("Computing on %s", process->simdata->host->name);
383 __MSG_task_execute(process, task);
385 PAJE_PROCESS_PUSH_STATE(process,"E");
386 res = __MSG_wait_for_computation(process,task);
387 PAJE_PROCESS_POP_STATE(process);
391 void __MSG_task_execute(m_process_t process, m_task_t task)
393 simdata_task_t simdata = NULL;
397 simdata = task->simdata;
399 simdata->compute = surf_workstation_resource->extension_public->
400 execute(MSG_process_get_host(process)->simdata->host,
401 simdata->computation_amount);
402 surf_workstation_resource->common_public->
403 set_priority(simdata->compute, simdata->priority);
405 surf_workstation_resource->common_public->action_set_data(simdata->compute,task);
408 MSG_error_t __MSG_wait_for_computation(m_process_t process, m_task_t task)
410 e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
411 simdata_task_t simdata = task->simdata;
415 __MSG_task_wait_event(process, task);
416 state=surf_workstation_resource->common_public->action_get_state(simdata->compute);
417 } while (state==SURF_ACTION_RUNNING);
421 if(state == SURF_ACTION_DONE) {
422 if(surf_workstation_resource->common_public->action_free(simdata->compute))
423 simdata->compute = NULL;
424 simdata->computation_amount = 0.0;
426 } else if(surf_workstation_resource->extension_public->
427 get_state(MSG_process_get_host(process)->simdata->host)
429 if(surf_workstation_resource->common_public->action_free(simdata->compute))
430 simdata->compute = NULL;
431 MSG_RETURN(MSG_HOST_FAILURE);
433 if(surf_workstation_resource->common_public->action_free(simdata->compute))
434 simdata->compute = NULL;
435 MSG_RETURN(MSG_TASK_CANCELLED);
438 /** \ingroup m_task_management
439 * \brief Creates a new #m_task_t (a parallel one....).
441 * A constructor for #m_task_t taking six arguments and returning the
442 corresponding object.
443 * \param name a name for the object. It is for user-level information
445 * \param host_nb the number of hosts implied in the parallel task.
446 * \param host_list an array of #host_nb m_host_t.
447 * \param computation_amount an array of #host_nb
448 doubles. computation_amount[i] is the total number of operations
449 that have to be performed on host_list[i].
450 * \param communication_amount an array of #host_nb*#host_nb doubles.
451 * \param data a pointer to any data may want to attach to the new
452 object. It is for user-level information and can be NULL. It can
453 be retrieved with the function \ref MSG_task_get_data.
455 * \return The new corresponding object.
457 m_task_t MSG_parallel_task_create(const char *name,
459 const m_host_t *host_list,
460 double *computation_amount,
461 double *communication_amount,
464 simdata_task_t simdata = xbt_new0(s_simdata_task_t,1);
465 m_task_t task = xbt_new0(s_m_task_t,1);
469 task->name = xbt_strdup(name);
470 task->simdata = simdata;
474 simdata->sleeping = xbt_dynar_new(sizeof(m_process_t),NULL);
475 simdata->rate = -1.0;
477 simdata->sender = NULL;
478 simdata->host_nb = host_nb;
480 simdata->host_list = xbt_new0(void *, host_nb);
481 simdata->comp_amount = computation_amount;
482 simdata->comm_amount = communication_amount;
484 for(i=0;i<host_nb;i++)
485 simdata->host_list[i] = host_list[i]->simdata->host;
491 static void __MSG_parallel_task_execute(m_process_t process, m_task_t task)
493 simdata_task_t simdata = NULL;
497 simdata = task->simdata;
499 xbt_assert0(simdata->host_nb,"This is not a parallel task. Go to hell.");
501 simdata->compute = surf_workstation_resource->extension_public->
502 execute_parallel_task(task->simdata->host_nb,
503 task->simdata->host_list,
504 task->simdata->comp_amount,
505 task->simdata->comm_amount,
509 surf_workstation_resource->common_public->action_set_data(simdata->compute,task);
512 MSG_error_t MSG_parallel_task_execute(m_task_t task)
514 m_process_t process = MSG_process_self();
517 DEBUG0("Computing on a tons of guys");
519 __MSG_parallel_task_execute(process, task);
521 if(task->simdata->compute)
522 res = __MSG_wait_for_computation(process,task);
530 /** \ingroup msg_gos_functions
531 * \brief Sleep for the specified number of seconds
533 * Makes the current process sleep until \a time seconds have elapsed.
535 * \param nb_sec a number of second
537 MSG_error_t MSG_process_sleep(double nb_sec)
539 e_surf_action_state_t state = SURF_ACTION_NOT_IN_THE_SYSTEM;
540 m_process_t process = MSG_process_self();
541 m_task_t dummy = NULL;
542 simdata_task_t simdata = NULL;
545 dummy = MSG_task_create("MSG_sleep", nb_sec, 0.0, NULL);
546 simdata = dummy->simdata;
548 simdata->compute = surf_workstation_resource->extension_public->
549 sleep(MSG_process_get_host(process)->simdata->host,
550 simdata->computation_amount);
551 surf_workstation_resource->common_public->action_set_data(simdata->compute,dummy);
556 __MSG_task_wait_event(process, dummy);
557 state=surf_workstation_resource->common_public->action_get_state(simdata->compute);
558 } while (state==SURF_ACTION_RUNNING);
561 if(state == SURF_ACTION_DONE) {
562 if(surf_workstation_resource->extension_public->
563 get_state(MSG_process_get_host(process)->simdata->host)
565 if(surf_workstation_resource->common_public->action_free(simdata->compute))
566 simdata->compute = NULL;
567 MSG_RETURN(MSG_HOST_FAILURE);
569 if(__MSG_process_isBlocked(process)) {
570 __MSG_process_unblock(MSG_process_self());
572 if(surf_workstation_resource->extension_public->
573 get_state(MSG_process_get_host(process)->simdata->host)
575 if(surf_workstation_resource->common_public->action_free(simdata->compute))
576 simdata->compute = NULL;
577 MSG_RETURN(MSG_HOST_FAILURE);
579 if(surf_workstation_resource->common_public->action_free(simdata->compute))
580 simdata->compute = NULL;
581 MSG_task_destroy(dummy);
583 } else MSG_RETURN(MSG_HOST_FAILURE);
586 /** \ingroup msg_gos_functions
587 * \brief Return the number of MSG tasks currently running on a
588 * the host of the current running process.
590 static int MSG_get_msgload(void)
596 xbt_assert0(0, "This function is still to be specified correctly (what do you mean by 'load', exactly?). In the meantime, please don't use it");
597 process = MSG_process_self();
598 return xbt_fifo_size(process->simdata->host->simdata->process_list);
601 /** \ingroup msg_gos_functions
603 * \brief Return the the last value returned by a MSG function (except
606 MSG_error_t MSG_get_errno(void)
608 return PROCESS_GET_ERRNO();