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);
41 /* Free the exception allocated at creation time */
42 if (process->exception)
43 free(process->exception);
44 if (process->properties)
45 xbt_dict_free(&process->properties);
54 * \brief Creates and runs the maestro process
56 void SIMIX_create_maestro_process()
58 smx_process_t process = NULL;
59 process = xbt_new0(s_smx_process_t, 1);
62 process->name = (char *) "";
64 process->exception = xbt_new(ex_ctx_t, 1);
65 XBT_CTX_INITIALIZE(process->exception);
67 /* Create a dummy context for maestro */
68 process->context = SIMIX_context_new(NULL, 0, NULL, NULL, NULL);
70 /* Set it as the maestro process */
71 simix_global->maestro_process = process;
72 simix_global->current_process = process;
78 * \brief Creates and runs a new #smx_process_t.
80 * 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.
82 * \param name a name for the object. It is for user-level information and can be NULL.
83 * \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.
84 * \param host the location where the new agent is executed.
85 * \param argc first argument passed to \a code
86 * \param argv second argument passed to \a code
87 * \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.
89 * \return The new corresponding object.
91 smx_process_t SIMIX_process_create(const char *name,
92 xbt_main_func_t code, void *data,
93 const char *hostname, int argc,
94 char **argv, xbt_dict_t properties)
96 smx_process_t process = NULL;
97 smx_host_t host = SIMIX_host_get_by_name(hostname);
99 DEBUG2("Start process %s on host %s", name, hostname);
101 if (!SIMIX_host_get_state(host)) {
102 WARN2("Cannot launch process '%s' on failed host '%s'", name, hostname);
105 process = xbt_new0(s_smx_process_t, 1);
107 xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
110 process->name = xbt_strdup(name);
111 process->smx_host = host;
112 process->mutex = NULL;
113 process->cond = NULL;
114 process->iwannadie = 0;
115 process->data = data;
117 VERB1("Create context %s", process->name);
118 process->context = SIMIX_context_new(code, argc, argv,
119 simix_global->cleanup_process_function,
122 process->exception = xbt_new(ex_ctx_t, 1);
123 XBT_CTX_INITIALIZE(process->exception);
126 process->properties = properties;
128 /* Add the process to it's host process list */
129 xbt_swag_insert(process, host->process_list);
131 DEBUG1("Start context '%s'", process->name);
132 SIMIX_context_start(process->context);
134 /* Now insert it in the global process list and in the process to run list */
135 xbt_swag_insert(process, simix_global->process_list);
136 DEBUG2("Inserting %s(%s) in the to_run list", process->name, host->name);
137 xbt_swag_insert(process, simix_global->process_to_run);
142 /** \brief Kill a SIMIX process
144 * This function simply kills a \a process... scarry isn't it ? :).
145 * \param process poor victim
148 void SIMIX_process_kill(smx_process_t process)
150 DEBUG2("Killing process %s on %s", process->name, process->smx_host->name);
152 process->iwannadie = 1;
154 /* If I'm killing myself then stop otherwise schedule the process to kill
155 * Two different behaviors, if I'm killing my self, remove from mutex and condition and stop. Otherwise, first we must schedule the process, wait its ending and after remove it from mutex and condition */
156 if (process == SIMIX_process_self()) {
157 /* Cleanup if we were waiting for something */
159 xbt_swag_remove(process, process->mutex->sleeping);
162 xbt_swag_remove(process, process->cond->sleeping);
163 if (process->waiting_action) {
164 SIMIX_unregister_action_to_condition(process->waiting_action, process->cond);
165 SIMIX_action_destroy(process->waiting_action);
167 SIMIX_context_stop(process->context);
169 DEBUG2("%p here! killing %p", simix_global->current_process, process);
170 SIMIX_process_schedule(process);
171 /* Cleanup if we were waiting for something */
173 xbt_swag_remove(process, process->mutex->sleeping);
176 xbt_swag_remove(process, process->cond->sleeping);
178 if (process->waiting_action) {
179 SIMIX_unregister_action_to_condition(process->waiting_action, process->cond);
180 SIMIX_action_destroy(process->waiting_action);
185 xbt_swag_remove(process, process->sem->sleeping);
187 if (process->waiting_action) {
188 SIMIX_unregister_action_to_semaphore(process->waiting_action, process->sem);
189 SIMIX_action_destroy(process->waiting_action);
196 * \brief Return the user data of a #smx_process_t.
198 * 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.
199 * \param process SIMIX process
200 * \return A void pointer to the user data
202 XBT_INLINE void *SIMIX_process_get_data(smx_process_t process)
204 xbt_assert0((process != NULL), "Invalid parameters");
205 return (process->data);
209 * \brief Set the user data of a #m_process_t.
211 * 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.
212 * \param process SIMIX process
213 * \param data User data
215 XBT_INLINE void SIMIX_process_set_data(smx_process_t process, void *data)
217 xbt_assert0((process != NULL), "Invalid parameters");
219 process->data = data;
224 * \brief Return the location on which an agent is running.
226 * 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.
227 * \param process SIMIX process
230 XBT_INLINE smx_host_t SIMIX_process_get_host(smx_process_t process)
232 xbt_assert0((process != NULL), "Invalid parameters");
233 return (process->smx_host);
237 * \brief Return the name of an agent.
239 * This functions checks whether \a process is a valid pointer or not and return its name.
240 * \param process SIMIX process
241 * \return The process name
243 XBT_INLINE const char *SIMIX_process_get_name(smx_process_t process)
245 xbt_assert0((process != NULL), "Invalid parameters");
246 return (process->name);
250 * \brief Changes the name of an agent.
252 * This functions checks whether \a process is a valid pointer or not and return its name.
253 * \param process SIMIX process
254 * \param name The new process name
256 XBT_INLINE void SIMIX_process_set_name(smx_process_t process, char *name)
258 xbt_assert0((process != NULL), "Invalid parameters");
259 process->name = name;
262 /** \ingroup m_process_management
263 * \brief Return the properties
265 * This functions returns the properties associated with this process
267 XBT_INLINE xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
269 return process->properties;
273 * \brief Return the current agent.
275 * This functions returns the currently running #smx_process_t.
276 * \return The SIMIX process
278 XBT_INLINE smx_process_t SIMIX_process_self(void)
280 return simix_global ? simix_global->current_process : NULL;
284 * \brief Suspend the process.
286 * This functions suspend the process by suspending the action on
287 * which it was waiting for the completion.
289 * \param process SIMIX process
291 void SIMIX_process_suspend(smx_process_t process)
293 xbt_assert0(process, "Invalid parameters");
295 if (process != SIMIX_process_self()) {
297 if (process->mutex) {
298 /* process blocked on a mutex, only set suspend=1 */
299 process->suspended = 1;
300 } else if (process->cond) {
301 /* process blocked cond, suspend all actions */
303 /* temporaries variables */
308 process->suspended = 1;
310 xbt_fifo_foreach(c->actions, i, act, smx_action_t) {
311 surf_workstation_model->suspend(act->surf_action);
314 process->suspended = 1;
317 /* process executing, I can create an action and suspend it */
320 char name[] = "dummy";
321 process->suspended = 1;
323 cond = SIMIX_cond_init();
324 dummy = SIMIX_action_execute(SIMIX_process_get_host(process), name, 0);
325 SIMIX_process_self()->waiting_action = dummy;
326 surf_workstation_model->suspend(dummy->surf_action);
327 SIMIX_register_action_to_condition(dummy, cond);
328 __SIMIX_cond_wait(cond);
329 SIMIX_process_self()->waiting_action = NULL;
330 SIMIX_unregister_action_to_condition(dummy, cond);
331 SIMIX_action_destroy(dummy);
332 SIMIX_cond_destroy(cond);
338 * \brief Resume a suspended process.
340 * This functions resume a suspended process by resuming the task on which it was waiting for the completion.
341 * \param process SIMIX process
343 void SIMIX_process_resume(smx_process_t process)
345 xbt_assert0((process != NULL), "Invalid parameters");
348 if (process == SIMIX_process_self())
351 if (process->mutex) {
352 DEBUG0("Resume process blocked on a mutex");
353 process->suspended = 0; /* It'll wake up by itself when mutex releases */
355 } else if (process->cond) {
356 /* temporaries variables */
360 DEBUG0("Resume process blocked on a conditional");
361 process->suspended = 0;
363 xbt_fifo_foreach(c->actions, i, act, smx_action_t) {
364 surf_workstation_model->resume(act->surf_action);
366 SIMIX_cond_signal(c);
369 process->suspended = 0;
370 xbt_swag_insert(process, simix_global->process_to_run);
375 * \brief Migrates an agent to another location.
377 * This function changes the value of the host on which \a process is running.
379 void SIMIX_process_change_host(smx_process_t process, char *source,
382 xbt_assert0((process != NULL), "Invalid parameters");
383 smx_host_t h1 = SIMIX_host_get_by_name(source);
384 smx_host_t h2 = SIMIX_host_get_by_name(dest);
385 process->smx_host = h2;
386 xbt_swag_remove(process, h1->process_list);
387 xbt_swag_insert(process, h2->process_list);
391 * \brief Returns true if the process is suspended .
393 * This checks whether a process is suspended or not by inspecting the task on which it was waiting for the completion.
394 * \param process SIMIX process
395 * \return 1, if the process is suspended, else 0.
397 XBT_INLINE int SIMIX_process_is_suspended(smx_process_t process)
399 xbt_assert0((process != NULL), "Invalid parameters");
401 return (process->suspended);
405 * \brief Returns the amount of SIMIX processes in the system
407 * Maestro internal process is not counted, only user code processes are
409 XBT_INLINE int SIMIX_process_count()
411 return xbt_swag_size(simix_global->process_list);
415 * Calling this function makes the process process to yield. The process
416 * that scheduled it returns from __SIMIX_process_schedule as if nothing
419 * Only the processes can call this function, giving back the control
422 void SIMIX_process_yield(void)
424 DEBUG1("Yield process '%s'", simix_global->current_process->name);
425 xbt_assert0((simix_global->current_process !=
426 simix_global->maestro_process),
427 "You are not supposed to run this function in maestro context!");
429 SIMIX_context_suspend(simix_global->current_process->context);
431 if (simix_global->current_process->iwannadie)
432 SIMIX_context_stop(simix_global->current_process->context);
435 void SIMIX_process_schedule(smx_process_t new_process)
437 DEBUG1("Scheduling context: '%s'", new_process->name);
439 /* save the current process */
440 smx_process_t old_process = simix_global->current_process;
442 /* update the current process */
443 simix_global->current_process = new_process;
445 /* schedule the context */
446 SIMIX_context_resume(old_process->context, new_process->context);
447 DEBUG1("Resumed from scheduling context: '%s'", new_process->name);
449 /* restore the current process to the previously saved process */
450 simix_global->current_process = old_process;
453 /* callback: context fetching */
454 ex_ctx_t *SIMIX_process_get_exception(void)
456 return simix_global->current_process->exception;
459 /* callback: termination */
460 void SIMIX_process_exception_terminate(xbt_ex_t * e)