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(m_process, msg,
12 "Logging specific to MSG (process)");
14 /** \defgroup m_process_management Management Functions of Agents
15 * \brief This section describes the agent structure of MSG
16 * (#m_process_t) and the functions for managing it.
18 * We need to simulate many independent scheduling decisions, so
19 * the concept of <em>process</em> is at the heart of the
20 * simulator. A process may be defined as a <em>code</em>, with
21 * some <em>private data</em>, executing in a <em>location</em>.
25 /******************************** Process ************************************/
26 /** \ingroup m_process_management
27 * \brief Creates and runs a new #m_process_t.
29 * Does exactly the same as #MSG_process_create_with_arguments but without
30 providing standard arguments (\a argc, \a argv, \a start_time, \a kill_time).
31 * \sa MSG_process_create_with_arguments
33 m_process_t MSG_process_create(const char *name,
34 m_process_code_t code, void *data,
37 return MSG_process_create_with_arguments(name, code, data, host, -1, NULL);
40 static void MSG_process_cleanup(void *arg)
43 while(((m_process_t)arg)->simdata->paje_state) {
44 PAJE_PROCESS_POP_STATE((m_process_t)arg);
47 PAJE_PROCESS_FREE(arg);
49 xbt_fifo_remove(msg_global->process_list, arg);
50 xbt_fifo_remove(msg_global->process_to_run, arg);
51 xbt_fifo_remove(((m_process_t) arg)->simdata->host->simdata->process_list, arg);
52 free(((m_process_t) arg)->name);
53 ((m_process_t) arg)->name = NULL;
54 free(((m_process_t) arg)->simdata);
55 ((m_process_t) arg)->simdata = NULL;
59 /** \ingroup m_process_management
60 * \brief Creates and runs a new #m_process_t.
62 * A constructor for #m_process_t taking four arguments and returning the
63 * corresponding object. The structure (and the corresponding thread) is
64 * created, and put in the list of ready process.
65 * \param name a name for the object. It is for user-level information
67 * \param code is a function describing the behavior of the agent. It
68 should then only use functions described in \ref
69 m_process_management (to create a new #m_process_t for example),
70 in \ref m_host_management (only the read-only functions i.e. whose
71 name contains the word get), in \ref m_task_management (to create
72 or destroy some #m_task_t for example) and in \ref
73 msg_gos_functions (to handle file transfers and task processing).
74 * \param data a pointer to any data one may want to attach to the new
75 object. It is for user-level information and can be NULL. It can
76 be retrieved with the function \ref MSG_process_get_data.
77 * \param host the location where the new agent is executed.
78 * \param argc first argument passed to \a code
79 * \param argv second argument passed to \a code
81 * \return The new corresponding object.
83 m_process_t MSG_process_create_with_arguments(const char *name,
84 m_process_code_t code, void *data,
85 m_host_t host, int argc, char **argv)
87 simdata_process_t simdata = xbt_new0(s_simdata_process_t,1);
88 m_process_t process = xbt_new0(s_m_process_t,1);
89 m_process_t self = NULL;
91 xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
94 simdata->PID = msg_global->PID++;
96 simdata->waiting_task = NULL;
99 simdata->context = xbt_context_new(code, NULL, NULL,
100 MSG_process_cleanup, process,
101 simdata->argc, simdata->argv);
103 if((self=msg_global->current_process)) {
104 simdata->PPID = MSG_process_get_PID(self);
108 simdata->last_errno=MSG_OK;
111 /* Process structure */
112 process->name = xbt_strdup(name);
113 process->simdata = simdata;
114 process->data = data;
116 xbt_fifo_push(host->simdata->process_list, process);
118 /* /////////////// FIX du current_process !!! ////////////// */
119 self = msg_global->current_process;
120 xbt_context_start(process->simdata->context);
121 msg_global->current_process = self;
123 xbt_fifo_push(msg_global->process_list, process);
124 xbt_fifo_push(msg_global->process_to_run, process);
126 PAJE_PROCESS_NEW(process);
131 /** \ingroup m_process_management
132 * \param process poor victim
134 * This function simply kills a \a process... scarry isn't it ? :)
136 void MSG_process_kill(m_process_t process)
139 simdata_process_t p_simdata = process->simdata;
140 simdata_host_t h_simdata= p_simdata->host->simdata;
142 m_process_t proc = NULL;
144 /* fprintf(stderr,"Killing %s(%d) on %s.\n",process->name, */
145 /* p_simdata->PID,p_simdata->host->name); */
147 for (i=0; i<msg_global->max_channel; i++) {
148 if (h_simdata->sleeping[i] == process) {
149 h_simdata->sleeping[i] = NULL;
153 if (i==msg_global->max_channel) {
154 if(p_simdata->waiting_task) {
155 xbt_dynar_foreach(p_simdata->waiting_task->simdata->sleeping,_cursor,proc) {
157 xbt_dynar_remove_at(p_simdata->waiting_task->simdata->sleeping,_cursor,&proc);
159 if(p_simdata->waiting_task->simdata->compute)
160 surf_workstation_resource->common_public->
161 action_free(p_simdata->waiting_task->simdata->compute);
162 else if (p_simdata->waiting_task->simdata->comm) {
163 surf_workstation_resource->common_public->
164 action_change_state(p_simdata->waiting_task->simdata->comm,SURF_ACTION_FAILED);
165 surf_workstation_resource->common_public->
166 action_free(p_simdata->waiting_task->simdata->comm);
168 CRITICAL0("UNKNOWN STATUS. Please report this bug.");
169 } else { /* Must be trying to put a task somewhere */
170 if(process==MSG_process_self()) {
173 CRITICAL0("UNKNOWN STATUS. Please report this bug.");
178 xbt_fifo_remove(msg_global->process_to_run,process);
179 xbt_fifo_remove(msg_global->process_list,process);
180 xbt_context_free(process->simdata->context);
183 /** \ingroup m_process_management
184 * \brief Migrates an agent to another location.
186 * This functions checks whether \a process and \a host are valid pointers
187 and change the value of the #m_host_t on which \a process is running.
189 MSG_error_t MSG_process_change_host(m_process_t process, m_host_t host)
191 simdata_process_t simdata = NULL;
195 xbt_assert0(((process) && (process->simdata)
196 && (host)), "Invalid parameters");
197 simdata = process->simdata;
199 xbt_fifo_remove(simdata->host->simdata->process_list,process);
200 simdata->host = host;
201 xbt_fifo_push(host->simdata->process_list,process);
206 /** \ingroup m_process_management
207 * \brief Return the user data of a #m_process_t.
209 * This functions checks whether \a process is a valid pointer or not
210 and return the user data associated to \a process if it is possible.
212 void *MSG_process_get_data(m_process_t process)
214 xbt_assert0((process != NULL), "Invalid parameters");
216 return (process->data);
219 /** \ingroup m_process_management
220 * \brief Set the user data of a #m_process_t.
222 * This functions checks whether \a process is a valid pointer or not
223 and set the user data associated to \a process if it is possible.
225 MSG_error_t MSG_process_set_data(m_process_t process,void *data)
227 xbt_assert0((process != NULL), "Invalid parameters");
228 xbt_assert0((process->data == NULL), "Data already set");
230 process->data = data;
235 /** \ingroup m_process_management
236 * \brief Return the location on which an agent is running.
238 * This functions checks whether \a process is a valid pointer or not
239 and return the m_host_t corresponding to the location on which \a
242 m_host_t MSG_process_get_host(m_process_t process)
244 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
246 return (((simdata_process_t) process->simdata)->host);
249 /** \ingroup m_process_management
251 * \brief Return a #m_process_t given its PID.
253 * This functions search in the list of all the created m_process_t for a m_process_t
254 whose PID is equal to \a PID. If no host is found, \c NULL is returned.
255 Note that the PID are uniq in the whole simulation, not only on a given host.
257 m_process_t MSG_process_from_PID(int PID)
259 xbt_fifo_item_t i = NULL;
260 m_process_t process = NULL;
262 xbt_fifo_foreach(msg_global->process_list,i,process,m_process_t) {
263 if(MSG_process_get_PID(process) == PID) return process;
268 /** \ingroup m_process_management
269 * \brief Returns the process ID of \a process.
271 * This functions checks whether \a process is a valid pointer or not
274 int MSG_process_get_PID(m_process_t process)
276 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
278 return (((simdata_process_t) process->simdata)->PID);
281 /** \ingroup m_process_management
282 * \brief Returns the process ID of the parent of \a process.
284 * This functions checks whether \a process is a valid pointer or not
285 and return its PID. Returns -1 if the agent has not been created by
288 int MSG_process_get_PPID(m_process_t process)
290 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
292 return (((simdata_process_t) process->simdata)->PPID);
295 /** \ingroup m_process_management
296 * \brief Return the name of an agent.
298 * This functions checks whether \a process is a valid pointer or not
301 const char *MSG_process_get_name(m_process_t process)
303 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
305 return (process->name);
308 /** \ingroup m_process_management
309 * \brief Return the PID of the current agent.
311 * This functions returns the PID of the currently running #m_process_t.
313 int MSG_process_self_PID(void)
315 return (MSG_process_get_PID(MSG_process_self()));
318 /** \ingroup m_process_management
319 * \brief Return the PPID of the current agent.
321 * This functions returns the PID of the parent of the currently
322 * running #m_process_t.
324 int MSG_process_self_PPID(void)
326 return (MSG_process_get_PPID(MSG_process_self()));
329 /** \ingroup m_process_management
330 * \brief Return the current agent.
332 * This functions returns the currently running #m_process_t.
334 m_process_t MSG_process_self(void)
336 return msg_global ? msg_global->current_process : NULL;
339 /** \ingroup m_process_management
340 * \brief Suspend the process.
342 * This functions suspend the process by suspending the task on which
343 * it was waiting for the completion.
345 MSG_error_t MSG_process_suspend(m_process_t process)
347 simdata_process_t simdata = NULL;
348 simdata_task_t simdata_task = NULL;
350 XBT_IN2("(%p(%s))", process, process->name);
352 xbt_assert0(((process) && (process->simdata)), "Invalid parameters");
354 PAJE_PROCESS_PUSH_STATE(process,"S");
356 if(process!=MSG_process_self()) {
357 simdata = process->simdata;
359 xbt_assert0(simdata->waiting_task,"Process not waiting for anything else. Weird !");
361 simdata_task = simdata->waiting_task->simdata;
363 simdata->suspended = 1;
364 if(simdata->blocked) {
369 xbt_assert0(((simdata_task->compute)||(simdata_task->comm))&&
370 !((simdata_task->compute)&&(simdata_task->comm)),
371 "Got a problem in deciding which action to choose !");
372 simdata->suspended = 1;
373 if(simdata_task->compute)
374 surf_workstation_resource->common_public->suspend(simdata_task->compute);
376 surf_workstation_resource->common_public->suspend(simdata_task->comm);
378 m_task_t dummy = MSG_TASK_UNINITIALIZED;
379 dummy = MSG_task_create("suspended", 0.0, 0, NULL);
381 simdata = process->simdata;
382 simdata->suspended = 1;
383 __MSG_task_execute(process,dummy);
384 surf_workstation_resource->common_public->suspend(dummy->simdata->compute);
385 __MSG_wait_for_computation(process,dummy);
386 simdata->suspended = 0;
388 MSG_task_destroy(dummy);
394 /** \ingroup m_process_management
395 * \brief Resume a suspended process.
397 * This functions resume a suspended process by resuming the task on
398 * which it was waiting for the completion.
400 MSG_error_t MSG_process_resume(m_process_t process)
402 simdata_process_t simdata = NULL;
403 simdata_task_t simdata_task = NULL;
405 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
408 XBT_IN2("(%p(%s))", process, process->name);
410 if(process == MSG_process_self()) {
415 simdata = process->simdata;
417 if(simdata->blocked) {
418 PAJE_PROCESS_POP_STATE(process);
420 simdata->suspended = 0; /* He'll wake up by itself */
425 if(!(simdata->waiting_task)) {
426 xbt_assert0(0,"Process not waiting for anything else. Weird !");
430 simdata_task = simdata->waiting_task->simdata;
433 if(simdata_task->compute) {
434 surf_workstation_resource->common_public->resume(simdata_task->compute);
435 PAJE_PROCESS_POP_STATE(process);
438 PAJE_PROCESS_POP_STATE(process);
439 surf_workstation_resource->common_public->resume(simdata_task->comm);
446 /** \ingroup m_process_management
447 * \brief Returns true if the process is suspended .
449 * This checks whether a process is suspended or not by inspecting the
450 * task on which it was waiting for the completion.
452 int MSG_process_is_suspended(m_process_t process)
454 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
456 return (process->simdata->suspended);
459 static char blocked_name[512];
461 int __MSG_process_block(double max_duration)
463 m_process_t process = MSG_process_self();
465 m_task_t dummy = MSG_TASK_UNINITIALIZED;
466 snprintf(blocked_name,512,"blocked (%s:%s)",process->name,
467 process->simdata->host->name);
469 XBT_IN1(": max_duration=%g",max_duration);
471 dummy = MSG_task_create(blocked_name, 0.0, 0, NULL);
473 PAJE_PROCESS_PUSH_STATE(process,"B");
475 process->simdata->blocked=1;
476 __MSG_task_execute(process,dummy);
477 surf_workstation_resource->common_public->suspend(dummy->simdata->compute);
479 surf_workstation_resource->common_public->set_max_duration(dummy->simdata->compute,
481 __MSG_wait_for_computation(process,dummy);
482 MSG_task_destroy(dummy);
483 process->simdata->blocked=0;
485 if(process->simdata->suspended) {
486 DEBUG0("I've been suspended in the meantime");
487 MSG_process_suspend(process);
488 DEBUG0("I've been resumed, let's keep going");
495 MSG_error_t __MSG_process_unblock(m_process_t process)
497 simdata_process_t simdata = NULL;
498 simdata_task_t simdata_task = NULL;
500 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
503 XBT_IN2(": %s unblocking %s", MSG_process_self()->name,process->name);
505 simdata = process->simdata;
506 if(!(simdata->waiting_task)) {
507 xbt_assert0(0,"Process not waiting for anything else. Weird !");
511 simdata_task = simdata->waiting_task->simdata;
513 xbt_assert0(simdata->blocked,"Process not blocked");
515 surf_workstation_resource->common_public->resume(simdata_task->compute);
517 PAJE_PROCESS_POP_STATE(process);
524 int __MSG_process_isBlocked(m_process_t process)
526 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
528 return (process->simdata->blocked);