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).
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 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)
85 simdata_process_t simdata = xbt_new0(s_simdata_process_t,1);
86 m_process_t process = xbt_new0(s_m_process_t,1);
87 m_process_t self = NULL;
89 xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
92 simdata->PID = msg_global->PID++;
94 simdata->waiting_task = NULL;
97 simdata->context = xbt_context_new(code, NULL, NULL,
98 MSG_process_cleanup, process,
99 simdata->argc, simdata->argv);
101 if((self=msg_global->current_process)) {
102 simdata->PPID = MSG_process_get_PID(self);
106 simdata->last_errno=MSG_OK;
109 /* Process structure */
110 process->name = xbt_strdup(name);
111 process->simdata = simdata;
112 process->data = data;
114 xbt_fifo_push(host->simdata->process_list, process);
116 /* /////////////// FIX du current_process !!! ////////////// */
117 self = msg_global->current_process;
118 xbt_context_start(process->simdata->context);
119 msg_global->current_process = self;
121 xbt_fifo_push(msg_global->process_list, process);
122 xbt_fifo_push(msg_global->process_to_run, process);
124 PAJE_PROCESS_NEW(process);
129 /** \ingroup m_process_management
130 * \param process poor victim
132 * This function simply kills a \a process... scarry isn't it ? :)
134 void MSG_process_kill(m_process_t process)
137 simdata_process_t p_simdata = process->simdata;
138 simdata_host_t h_simdata= p_simdata->host->simdata;
140 /* fprintf(stderr,"Killing %s(%d) on %s.\n",process->name, */
141 /* p_simdata->PID,p_simdata->host->name); */
143 for (i=0; i<msg_global->max_channel; i++) {
144 if (h_simdata->sleeping[i] == process) {
145 h_simdata->sleeping[i] = NULL;
149 if (i==msg_global->max_channel) {
150 if(p_simdata->waiting_task) {
151 if(p_simdata->waiting_task->simdata->compute)
152 surf_workstation_resource->common_public->
153 action_free(p_simdata->waiting_task->simdata->compute);
154 else if (p_simdata->waiting_task->simdata->comm)
155 surf_workstation_resource->common_public->
156 action_change_state(p_simdata->waiting_task->simdata->comm,SURF_ACTION_FAILED);
158 CRITICAL0("UNKNOWN STATUS. Please report this bug.");
159 } else { /* Must be trying to put a task somewhere */
160 if(process==MSG_process_self()) {
163 CRITICAL0("UNKNOWN STATUS. Please report this bug.");
168 xbt_fifo_remove(msg_global->process_list,process);
169 xbt_context_free(process->simdata->context);
172 /** \ingroup m_process_management
173 * \brief Migrates an agent to another location.
175 * This functions checks whether \a process and \a host are valid pointers
176 and change the value of the #m_host_t on which \a process is running.
178 MSG_error_t MSG_process_change_host(m_process_t process, m_host_t host)
180 simdata_process_t simdata = NULL;
184 xbt_assert0(((process) && (process->simdata)
185 && (host)), "Invalid parameters");
186 simdata = process->simdata;
188 xbt_fifo_remove(simdata->host->simdata->process_list,process);
189 simdata->host = host;
190 xbt_fifo_push(host->simdata->process_list,process);
195 /** \ingroup m_process_management
196 * \brief Return the user data of a #m_process_t.
198 * This functions checks whether \a process is a valid pointer or not
199 and return the user data associated to \a process if it is possible.
201 void *MSG_process_get_data(m_process_t process)
203 xbt_assert0((process != NULL), "Invalid parameters");
205 return (process->data);
208 /** \ingroup m_process_management
209 * \brief Set the user data of a #m_process_t.
211 * This functions checks whether \a process is a valid pointer or not
212 and set the user data associated to \a process if it is possible.
214 MSG_error_t MSG_process_set_data(m_process_t process,void *data)
216 xbt_assert0((process != NULL), "Invalid parameters");
217 xbt_assert0((process->data == NULL), "Data already set");
219 process->data = data;
224 /** \ingroup m_process_management
225 * \brief Return the location on which an agent is running.
227 * This functions checks whether \a process is a valid pointer or not
228 and return the m_host_t corresponding to the location on which \a
231 m_host_t MSG_process_get_host(m_process_t process)
233 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
235 return (((simdata_process_t) process->simdata)->host);
238 /** \ingroup m_process_management
240 * \brief Return a #m_process_t given its PID.
242 * This functions search in the list of all the created m_process_t for a m_process_t
243 whose PID is equal to \a PID. If no host is found, \c NULL is returned.
244 Note that the PID are uniq in the whole simulation, not only on a given host.
246 m_process_t MSG_process_from_PID(int PID)
248 xbt_fifo_item_t i = NULL;
249 m_process_t process = NULL;
251 xbt_fifo_foreach(msg_global->process_list,i,process,m_process_t) {
252 if(MSG_process_get_PID(process) == PID) return process;
257 /** \ingroup m_process_management
258 * \brief Returns the process ID of \a process.
260 * This functions checks whether \a process is a valid pointer or not
263 int MSG_process_get_PID(m_process_t process)
265 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
267 return (((simdata_process_t) process->simdata)->PID);
270 /** \ingroup m_process_management
271 * \brief Returns the process ID of the parent of \a process.
273 * This functions checks whether \a process is a valid pointer or not
274 and return its PID. Returns -1 if the agent has not been created by
277 int MSG_process_get_PPID(m_process_t process)
279 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
281 return (((simdata_process_t) process->simdata)->PPID);
284 /** \ingroup m_process_management
285 * \brief Return the name of an agent.
287 * This functions checks whether \a process is a valid pointer or not
290 const char *MSG_process_get_name(m_process_t process)
292 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
294 return (process->name);
297 /** \ingroup m_process_management
298 * \brief Return the PID of the current agent.
300 * This functions returns the PID of the currently running #m_process_t.
302 int MSG_process_self_PID(void)
304 return (MSG_process_get_PID(MSG_process_self()));
307 /** \ingroup m_process_management
308 * \brief Return the PPID of the current agent.
310 * This functions returns the PID of the parent of the currently
311 * running #m_process_t.
313 int MSG_process_self_PPID(void)
315 return (MSG_process_get_PPID(MSG_process_self()));
318 /** \ingroup m_process_management
319 * \brief Return the current agent.
321 * This functions returns the currently running #m_process_t.
323 m_process_t MSG_process_self(void)
325 return msg_global ? msg_global->current_process : NULL;
328 /** \ingroup m_process_management
329 * \brief Suspend the process.
331 * This functions suspend the process by suspending the task on which
332 * it was waiting for the completion.
334 MSG_error_t MSG_process_suspend(m_process_t process)
336 simdata_process_t simdata = NULL;
337 simdata_task_t simdata_task = NULL;
340 xbt_assert0(((process) && (process->simdata)), "Invalid parameters");
342 PAJE_PROCESS_PUSH_STATE(process,"S");
344 if(process!=MSG_process_self()) {
345 simdata = process->simdata;
347 xbt_assert0(simdata->waiting_task,"Process not waiting for anything else. Weird !");
349 simdata_task = simdata->waiting_task->simdata;
351 simdata->suspended = 1;
352 if(simdata->blocked) return MSG_OK;
354 xbt_assert0(((simdata_task->compute)||(simdata_task->comm))&&
355 !((simdata_task->compute)&&(simdata_task->comm)),
356 "Got a problem in deciding which action to choose !");
357 simdata->suspended = 1;
358 if(simdata_task->compute)
359 surf_workstation_resource->common_public->suspend(simdata_task->compute);
361 surf_workstation_resource->common_public->suspend(simdata_task->comm);
363 m_task_t dummy = MSG_TASK_UNINITIALIZED;
364 dummy = MSG_task_create("suspended", 0.0, 0, NULL);
366 simdata = process->simdata;
367 simdata->suspended = 1;
368 __MSG_task_execute(process,dummy);
369 surf_workstation_resource->common_public->suspend(dummy->simdata->compute);
370 __MSG_wait_for_computation(process,dummy);
371 simdata->suspended = 0;
373 MSG_task_destroy(dummy);
378 /** \ingroup m_process_management
379 * \brief Resume a suspended process.
381 * This functions resume a suspended process by resuming the task on
382 * which it was waiting for the completion.
384 MSG_error_t MSG_process_resume(m_process_t process)
386 simdata_process_t simdata = NULL;
387 simdata_task_t simdata_task = NULL;
390 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
393 simdata = process->simdata;
396 if(simdata->blocked) {
397 PAJE_PROCESS_POP_STATE(process);
399 simdata->suspended = 0; /* He'll wake up by itself */
403 if(!(simdata->waiting_task)) {
404 xbt_assert0(0,"Process not waiting for anything else. Weird !");
407 simdata_task = simdata->waiting_task->simdata;
410 if(simdata_task->compute) {
411 surf_workstation_resource->common_public->resume(simdata_task->compute);
412 PAJE_PROCESS_POP_STATE(process);
415 PAJE_PROCESS_POP_STATE(process);
416 surf_workstation_resource->common_public->resume(simdata_task->comm);
422 /** \ingroup m_process_management
423 * \brief Returns true if the process is suspended .
425 * This checks whether a process is suspended or not by inspecting the
426 * task on which it was waiting for the completion.
428 int MSG_process_isSuspended(m_process_t process)
430 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
432 return (process->simdata->suspended);
435 MSG_error_t __MSG_process_block(void)
437 m_process_t process = MSG_process_self();
439 m_task_t dummy = MSG_TASK_UNINITIALIZED;
440 dummy = MSG_task_create("blocked", 0.0, 0, NULL);
442 PAJE_PROCESS_PUSH_STATE(process,"B");
444 process->simdata->blocked=1;
445 __MSG_task_execute(process,dummy);
446 surf_workstation_resource->common_public->suspend(dummy->simdata->compute);
447 __MSG_wait_for_computation(process,dummy);
448 process->simdata->blocked=0;
450 if(process->simdata->suspended)
451 MSG_process_suspend(process);
453 MSG_task_destroy(dummy);
458 MSG_error_t __MSG_process_unblock(m_process_t process)
460 simdata_process_t simdata = NULL;
461 simdata_task_t simdata_task = NULL;
464 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
467 simdata = process->simdata;
468 if(!(simdata->waiting_task)) {
469 xbt_assert0(0,"Process not waiting for anything else. Weird !");
472 simdata_task = simdata->waiting_task->simdata;
474 xbt_assert0(simdata->blocked,"Process not blocked");
476 surf_workstation_resource->common_public->resume(simdata_task->compute);
478 PAJE_PROCESS_POP_STATE(process);
483 int __MSG_process_isBlocked(m_process_t process)
485 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
487 return (process->simdata->blocked);