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. */
10 #include "xbt/error.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, 0.0, -1.0);
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 free(((m_process_t) arg)->simdata);
57 /** \ingroup m_process_management
58 * \brief Creates and runs a new #m_process_t.
60 * A constructor for #m_process_t taking four arguments and returning the
61 * corresponding object. The structure (and the corresponding thread) is
62 * created, and put in the list of ready process.
63 * \param name a name for the object. It is for user-level information
65 * \param code is a function describing the behavior of the agent. It
66 should then only use functions described in \ref
67 m_process_management (to create a new #m_process_t for example),
68 in \ref m_host_management (only the read-only functions i.e. whose
69 name contains the word get), in \ref m_task_management (to create
70 or destroy some #m_task_t for example) and in \ref
71 msg_gos_functions (to handle file transfers and task processing).
72 * \param data a pointer to any data may want to attach to the new
73 object. It is for user-level information and can be NULL. It can
74 be retrieved with the function \ref MSG_process_get_data.
75 * \param host the location where the new agent is executed.
76 * \param argc first argument passed to \a code
77 * \param argv second argument passed to \a code
79 * \return The new corresponding object.
81 m_process_t MSG_process_create_with_arguments(const char *name,
82 m_process_code_t code, void *data,
83 m_host_t host, int argc, char **argv,
84 double start_time, double kill_time)
86 simdata_process_t simdata = xbt_new0(s_simdata_process_t,1);
87 m_process_t process = xbt_new0(s_m_process_t,1);
88 m_process_t self = NULL;
90 xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
93 simdata->PID = msg_global->PID++;
95 simdata->waiting_task = NULL;
98 simdata->kill_time = kill_time;
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 if (start_time == 0.0) {
125 xbt_fifo_push(msg_global->process_to_run, process);
127 /* FIXME: let the process sleep for the specified amount of time */
128 xbt_fifo_push(msg_global->process_to_run, process);
131 PAJE_PROCESS_NEW(process);
136 /** \ingroup m_process_management
137 * \param process poor victim
139 * This function simply kills a \a process... scarry isn't it ? :)
141 void MSG_process_kill(m_process_t process)
144 simdata_process_t p_simdata = process->simdata;
145 simdata_host_t h_simdata= p_simdata->host->simdata;
147 /* fprintf(stderr,"Killing %s(%d) on %s.\n",process->name, */
148 /* p_simdata->PID,p_simdata->host->name); */
150 for (i=0; i<msg_global->max_channel; i++) {
151 if (h_simdata->sleeping[i] == process) {
152 h_simdata->sleeping[i] = NULL;
156 if (i==msg_global->max_channel) {
157 if(p_simdata->waiting_task) {
158 if(p_simdata->waiting_task->simdata->compute)
159 surf_workstation_resource->common_public->
160 action_free(p_simdata->waiting_task->simdata->compute);
161 else if (p_simdata->waiting_task->simdata->comm)
162 surf_workstation_resource->common_public->
163 action_change_state(p_simdata->waiting_task->simdata->comm,SURF_ACTION_FAILED);
165 CRITICAL0("UNKNOWN STATUS. Please report this bug.");
166 } else { /* Must be trying to put a task somewhere */
167 if(process==MSG_process_self()) {
170 CRITICAL0("UNKNOWN STATUS. Please report this bug.");
175 xbt_fifo_remove(msg_global->process_list,process);
176 xbt_context_free(process->simdata->context);
179 /** \ingroup m_process_management
180 * \brief Migrates an agent to another location.
182 * This functions checks whether \a process and \a host are valid pointers
183 and change the value of the #m_host_t on which \a process is running.
185 MSG_error_t MSG_process_change_host(m_process_t process, m_host_t host)
187 simdata_process_t simdata = NULL;
191 xbt_assert0(((process) && (process->simdata)
192 && (host)), "Invalid parameters");
193 simdata = process->simdata;
195 xbt_fifo_remove(simdata->host->simdata->process_list,process);
196 simdata->host = host;
197 xbt_fifo_push(host->simdata->process_list,process);
202 /** \ingroup m_process_management
203 * \brief Return the user data of a #m_process_t.
205 * This functions checks whether \a process is a valid pointer or not
206 and return the user data associated to \a process if it is possible.
208 void *MSG_process_get_data(m_process_t process)
210 xbt_assert0((process != NULL), "Invalid parameters");
212 return (process->data);
215 /** \ingroup m_process_management
216 * \brief Set the user data of a #m_process_t.
218 * This functions checks whether \a process is a valid pointer or not
219 and set the user data associated to \a process if it is possible.
221 MSG_error_t MSG_process_set_data(m_process_t process,void *data)
223 xbt_assert0((process != NULL), "Invalid parameters");
224 xbt_assert0((process->data == NULL), "Data already set");
226 process->data = data;
231 /** \ingroup m_process_management
232 * \brief Return the location on which an agent is running.
234 * This functions checks whether \a process is a valid pointer or not
235 and return the m_host_t corresponding to the location on which \a
238 m_host_t MSG_process_get_host(m_process_t process)
240 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
242 return (((simdata_process_t) process->simdata)->host);
245 /** \ingroup m_process_management
247 * \brief Return a #m_process_t given its PID.
249 * This functions search in the list of all the created m_process_t for a m_process_t
250 whose PID is equal to \a PID. If no host is found, \c NULL is returned.
251 Note that the PID are uniq in the whole simulation, not only on a given host.
253 m_process_t MSG_process_from_PID(int PID)
255 xbt_fifo_item_t i = NULL;
256 m_process_t process = NULL;
258 xbt_fifo_foreach(msg_global->process_list,i,process,m_process_t) {
259 if(MSG_process_get_PID(process) == PID) return process;
264 /** \ingroup m_process_management
265 * \brief Returns the process ID of \a process.
267 * This functions checks whether \a process is a valid pointer or not
270 int MSG_process_get_PID(m_process_t process)
272 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
274 return (((simdata_process_t) process->simdata)->PID);
277 /** \ingroup m_process_management
278 * \brief Returns the process ID of the parent of \a process.
280 * This functions checks whether \a process is a valid pointer or not
281 and return its PID. Returns -1 if the agent has not been created by
284 int MSG_process_get_PPID(m_process_t process)
286 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
288 return (((simdata_process_t) process->simdata)->PPID);
291 /** \ingroup m_process_management
292 * \brief Return the name of an agent.
294 * This functions checks whether \a process is a valid pointer or not
297 const char *MSG_process_get_name(m_process_t process)
299 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
301 return (process->name);
304 /** \ingroup m_process_management
305 * \brief Return the PID of the current agent.
307 * This functions returns the PID of the currently running #m_process_t.
309 int MSG_process_self_PID(void)
311 return (MSG_process_get_PID(MSG_process_self()));
314 /** \ingroup m_process_management
315 * \brief Return the PPID of the current agent.
317 * This functions returns the PID of the parent of the currently
318 * running #m_process_t.
320 int MSG_process_self_PPID(void)
322 return (MSG_process_get_PPID(MSG_process_self()));
325 /** \ingroup m_process_management
326 * \brief Return the current agent.
328 * This functions returns the currently running #m_process_t.
330 m_process_t MSG_process_self(void)
332 return msg_global ? msg_global->current_process : NULL;
335 /** \ingroup m_process_management
336 * \brief Suspend the process.
338 * This functions suspend the process by suspending the task on which
339 * it was waiting for the completion.
341 MSG_error_t MSG_process_suspend(m_process_t process)
343 simdata_process_t simdata = NULL;
344 simdata_task_t simdata_task = NULL;
347 xbt_assert0(((process) && (process->simdata)), "Invalid parameters");
349 PAJE_PROCESS_PUSH_STATE(process,"S");
351 if(process!=MSG_process_self()) {
352 simdata = process->simdata;
354 xbt_assert0(simdata->waiting_task,"Process not waiting for anything else. Weird !");
356 simdata_task = simdata->waiting_task->simdata;
358 simdata->suspended = 1;
359 if(simdata->blocked) return MSG_OK;
361 xbt_assert0(((simdata_task->compute)||(simdata_task->comm))&&
362 !((simdata_task->compute)&&(simdata_task->comm)),
363 "Got a problem in deciding which action to choose !");
364 simdata->suspended = 1;
365 if(simdata_task->compute)
366 surf_workstation_resource->common_public->suspend(simdata_task->compute);
368 surf_workstation_resource->common_public->suspend(simdata_task->comm);
370 m_task_t dummy = MSG_TASK_UNINITIALIZED;
371 dummy = MSG_task_create("suspended", 0.0, 0, NULL);
373 simdata = process->simdata;
374 simdata->suspended = 1;
375 __MSG_task_execute(process,dummy);
376 surf_workstation_resource->common_public->suspend(dummy->simdata->compute);
377 __MSG_wait_for_computation(process,dummy);
378 simdata->suspended = 0;
380 MSG_task_destroy(dummy);
385 /** \ingroup m_process_management
386 * \brief Resume a suspended process.
388 * This functions resume a suspended process by resuming the task on
389 * which it was waiting for the completion.
391 MSG_error_t MSG_process_resume(m_process_t process)
393 simdata_process_t simdata = NULL;
394 simdata_task_t simdata_task = NULL;
397 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
400 simdata = process->simdata;
403 if(simdata->blocked) {
404 PAJE_PROCESS_POP_STATE(process);
406 simdata->suspended = 0; /* He'll wake up by itself */
410 if(!(simdata->waiting_task)) {
411 xbt_assert0(0,"Process not waiting for anything else. Weird !");
414 simdata_task = simdata->waiting_task->simdata;
417 if(simdata_task->compute) {
418 surf_workstation_resource->common_public->resume(simdata_task->compute);
419 PAJE_PROCESS_POP_STATE(process);
422 PAJE_PROCESS_POP_STATE(process);
423 surf_workstation_resource->common_public->resume(simdata_task->comm);
429 /** \ingroup m_process_management
430 * \brief Returns true if the process is suspended .
432 * This checks whether a process is suspended or not by inspecting the
433 * task on which it was waiting for the completion.
435 int MSG_process_isSuspended(m_process_t process)
437 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
439 return (process->simdata->suspended);
442 MSG_error_t __MSG_process_block(void)
444 m_process_t process = MSG_process_self();
446 m_task_t dummy = MSG_TASK_UNINITIALIZED;
447 dummy = MSG_task_create("blocked", 0.0, 0, NULL);
449 PAJE_PROCESS_PUSH_STATE(process,"B");
451 process->simdata->blocked=1;
452 __MSG_task_execute(process,dummy);
453 surf_workstation_resource->common_public->suspend(dummy->simdata->compute);
454 __MSG_wait_for_computation(process,dummy);
455 process->simdata->blocked=0;
457 if(process->simdata->suspended)
458 MSG_process_suspend(process);
460 MSG_task_destroy(dummy);
465 MSG_error_t __MSG_process_unblock(m_process_t process)
467 simdata_process_t simdata = NULL;
468 simdata_task_t simdata_task = NULL;
471 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
474 simdata = process->simdata;
475 if(!(simdata->waiting_task)) {
476 xbt_assert0(0,"Process not waiting for anything else. Weird !");
479 simdata_task = simdata->waiting_task->simdata;
481 xbt_assert0(simdata->blocked,"Process not blocked");
483 surf_workstation_resource->common_public->resume(simdata_task->compute);
485 PAJE_PROCESS_POP_STATE(process);
490 int __MSG_process_isBlocked(m_process_t process)
492 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
494 return (process->simdata->blocked);