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"
12 #include "msg/mailbox.h"
14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_process, simix,
15 "Logging specific to SIMIX (process)");
18 * \brief Move a process to the list of process to destroy. *
20 void SIMIX_process_cleanup(void *arg)
22 xbt_swag_remove(arg, simix_global->process_to_run);
23 xbt_swag_remove(arg, simix_global->process_list);
24 xbt_swag_remove(arg, ((smx_process_t)arg)->smx_host->process_list);
25 xbt_swag_insert(arg, simix_global->process_to_destroy);
31 * Should be called some time to time to free the memory allocated for processes
32 * that have finished (or killed).
34 void SIMIX_process_empty_trash(void)
36 smx_process_t process = NULL;
38 while ((process = xbt_swag_extract(simix_global->process_to_destroy))){
39 SIMIX_context_free(process->context);
47 * \brief Creates and runs the maestro process
49 void __SIMIX_create_maestro_process()
51 smx_process_t process = NULL;
52 process = xbt_new0(s_smx_process_t, 1);
55 process->name = (char *)"";
57 /* Create a dummy context for maestro */
58 process->context = SIMIX_context_new(NULL, 0, NULL, NULL, NULL);
60 /* Set it as the maestro process */
61 simix_global->maestro_process = process;
62 simix_global->current_process = process;
68 * \brief Creates and runs a new #smx_process_t.
70 * A constructor for #m_process_t taking four arguments and returning the corresponding object. The structure (and the corresponding thread) is created, and put in the list of ready process.
72 * \param name a name for the object. It is for user-level information and can be NULL.
73 * \param data a pointer to any data one may want to attach to the new object. It is for user-level information and can be NULL. It can be retrieved with the function \ref MSG_process_get_data.
74 * \param host the location where the new agent is executed.
75 * \param argc first argument passed to \a code
76 * \param argv second argument passed to \a code
77 * \param clean_process_function The cleanup function of user process. It will be called when the process finish. This function have to call the SIMIX_process_cleanup.
79 * \return The new corresponding object.
81 smx_process_t SIMIX_process_create(const char *name,
82 xbt_main_func_t code, void *data,
83 const char *hostname, int argc,
84 char **argv, xbt_dict_t properties)
86 smx_process_t process = NULL;
87 smx_host_t host = SIMIX_host_get_by_name(hostname);
89 DEBUG2("Start process %s on host %s", name, hostname);
91 if (!SIMIX_host_get_state(host)) {
92 WARN2("Cannot launch process '%s' on failed host '%s'", name, hostname);
95 process = xbt_new0(s_smx_process_t, 1);
97 xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
100 process->name = xbt_strdup(name);
101 process->smx_host = host;
102 process->mutex = NULL;
103 process->cond = NULL;
104 process->iwannadie = 0;
106 VERB1("Create context %s", process->name);
107 process->context = SIMIX_context_new(code, argc, argv,
108 simix_global->cleanup_process_function,
111 process->data = data;
114 process->properties = properties;
116 /* Add the process to it's host process list */
117 xbt_swag_insert(process, host->process_list);
119 DEBUG1("Start context '%s'", process->name);
120 SIMIX_context_start(process->context);
122 /* Now insert it in the global process list and in the process to run list */
123 xbt_swag_insert(process, simix_global->process_list);
124 DEBUG2("Inserting %s(%s) in the to_run list", process->name, host->name);
125 xbt_swag_insert(process, simix_global->process_to_run);
130 /** \brief Kill a SIMIX process
132 * This function simply kills a \a process... scarry isn't it ? :).
133 * \param process poor victim
136 void SIMIX_process_kill(smx_process_t process)
138 DEBUG2("Killing process %s on %s", process->name, process->smx_host->name);
140 /* Cleanup if we were waiting for something */
142 xbt_swag_remove(process, process->mutex->sleeping);
145 xbt_swag_remove(process, process->cond->sleeping);
147 DEBUG2("%p here! killing %p", simix_global->current_process, process);
149 process->iwannadie = 1;
151 /* If I'm killing myself then stop otherwise schedule the process to kill */
152 if (process == SIMIX_process_self())
153 SIMIX_context_stop(process->context);
155 __SIMIX_process_schedule(process);
160 * \brief Return the user data of a #smx_process_t.
162 * This functions checks whether \a process is a valid pointer or not and return the user data associated to \a process if it is possible.
163 * \param process SIMIX process
164 * \return A void pointer to the user data
166 void *SIMIX_process_get_data(smx_process_t process)
168 xbt_assert0((process != NULL), "Invalid parameters");
169 return (process->data);
173 * \brief Set the user data of a #m_process_t.
175 * This functions checks whether \a process is a valid pointer or not and set the user data associated to \a process if it is possible.
176 * \param process SIMIX process
177 * \param data User data
179 void SIMIX_process_set_data(smx_process_t process, void *data)
181 xbt_assert0((process != NULL), "Invalid parameters");
183 process->data = data;
188 * \brief Return the location on which an agent is running.
190 * This functions checks whether \a process is a valid pointer or not and return the m_host_t corresponding to the location on which \a process is running.
191 * \param process SIMIX process
194 smx_host_t SIMIX_process_get_host(smx_process_t process)
196 xbt_assert0((process != NULL), "Invalid parameters");
197 return (process->smx_host);
201 * \brief Return the name of an agent.
203 * This functions checks whether \a process is a valid pointer or not and return its name.
204 * \param process SIMIX process
205 * \return The process name
207 const char *SIMIX_process_get_name(smx_process_t process)
209 xbt_assert0((process != NULL), "Invalid parameters");
210 return (process->name);
214 * \brief Changes the name of an agent.
216 * This functions checks whether \a process is a valid pointer or not and return its name.
217 * \param process SIMIX process
218 * \param name The new process name
220 void SIMIX_process_set_name(smx_process_t process, char *name)
222 xbt_assert0((process != NULL), "Invalid parameters");
223 process->name = name;
226 /** \ingroup m_process_management
227 * \brief Return the properties
229 * This functions returns the properties associated with this process
231 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
233 return process->properties;
237 * \brief Return the current agent.
239 * This functions returns the currently running #smx_process_t.
240 * \return The SIMIX process
242 smx_process_t SIMIX_process_self(void)
244 return simix_global ? simix_global->current_process : NULL;
248 * \brief Suspend the process.
250 * This functions suspend the process by suspending the action on
251 * which it was waiting for the completion.
253 * \param process SIMIX process
255 void SIMIX_process_suspend(smx_process_t process)
257 xbt_assert0(process, "Invalid parameters");
259 if (process != SIMIX_process_self()) {
261 if (process->mutex) {
262 /* process blocked on a mutex, only set suspend=1 */
263 process->suspended = 1;
264 } else if (process->cond) {
265 /* process blocked cond, suspend all actions */
267 /* temporaries variables */
272 process->suspended = 1;
274 xbt_fifo_foreach(c->actions, i, act, smx_action_t) {
275 surf_workstation_model->suspend(act->surf_action);
278 process->suspended = 1;
281 /* process executing, I can create an action and suspend it */
284 char name[] = "dummy";
285 process->suspended = 1;
287 cond = SIMIX_cond_init();
288 dummy = SIMIX_action_execute(SIMIX_process_get_host(process), name, 0);
289 surf_workstation_model->suspend(dummy->surf_action);
290 SIMIX_register_action_to_condition(dummy, cond);
291 __SIMIX_cond_wait(cond);
292 SIMIX_unregister_action_to_condition(dummy, cond);
293 SIMIX_action_destroy(dummy);
294 SIMIX_cond_destroy(cond);
300 * \brief Resume a suspended process.
302 * This functions resume a suspended process by resuming the task on which it was waiting for the completion.
303 * \param process SIMIX process
305 void SIMIX_process_resume(smx_process_t process)
307 xbt_assert0((process != NULL), "Invalid parameters");
310 if (process == SIMIX_process_self())
313 if (process->mutex) {
314 DEBUG0("Resume process blocked on a mutex");
315 process->suspended = 0; /* It'll wake up by itself when mutex releases */
317 } else if (process->cond) {
318 /* temporaries variables */
322 DEBUG0("Resume process blocked on a conditional");
323 process->suspended = 0;
325 xbt_fifo_foreach(c->actions, i, act, smx_action_t) {
326 surf_workstation_model->resume(act->surf_action);
328 SIMIX_cond_signal(c);
331 process->suspended = 0;
332 xbt_swag_insert(process, simix_global->process_to_run);
337 * \brief Migrates an agent to another location.
339 * This function changes the value of the host on which \a process is running.
341 void SIMIX_process_change_host(smx_process_t process, char *source, char *dest)
343 xbt_assert0((process != NULL), "Invalid parameters");
344 smx_host_t h1 = SIMIX_host_get_by_name(source);
345 smx_host_t h2 = SIMIX_host_get_by_name(dest);
346 process->smx_host = h2;
347 xbt_swag_remove(process, h1->process_list);
348 xbt_swag_insert(process, h2->process_list);
352 * \brief Returns true if the process is suspended .
354 * This checks whether a process is suspended or not by inspecting the task on which it was waiting for the completion.
355 * \param process SIMIX process
356 * \return 1, if the process is suspended, else 0.
358 int SIMIX_process_is_suspended(smx_process_t process)
360 xbt_assert0((process != NULL), "Invalid parameters");
362 return (process->suspended);
366 * \brief Returns the amount of SIMIX processes in the system
368 * Maestro internal process is not counted, only user code processes are
370 int SIMIX_process_count()
372 return xbt_swag_size(simix_global->process_list);
376 * Calling this function makes the process process to yield. The process
377 * that scheduled it returns from __SIMIX_process_schedule as if nothing
380 * Only the processes can call this function, giving back the control
383 void __SIMIX_process_yield(void)
385 DEBUG1("Yield process '%s'", simix_global->current_process->name);
386 xbt_assert0((simix_global->current_process != simix_global->maestro_process),
387 "You are not supposed to run this function here!");
389 SIMIX_context_suspend(simix_global->current_process->context);
391 if (simix_global->current_process->iwannadie)
392 SIMIX_context_stop(simix_global->current_process->context);
395 void __SIMIX_process_schedule(smx_process_t new_process)
397 DEBUG1("Scheduling context: '%s'", new_process->name);
399 /* save the current process */
400 smx_process_t old_process = simix_global->current_process;
402 /* update the current process */
403 simix_global->current_process = new_process;
405 /* schedule the context */
406 SIMIX_context_resume(old_process->context, new_process->context);
408 /* restore the current process to the previously saved process */
409 simix_global->current_process = old_process;