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);
52 * \brief Creates and runs the maestro process
54 void SIMIX_create_maestro_process()
56 smx_process_t process = NULL;
57 process = xbt_new0(s_smx_process_t, 1);
60 process->name = (char *)"";
62 process->exception = xbt_new(ex_ctx_t, 1);
63 XBT_CTX_INITIALIZE(process->exception);
65 /* Create a dummy context for maestro */
66 process->context = SIMIX_context_new(NULL, 0, NULL, NULL, NULL);
68 /* Set it as the maestro process */
69 simix_global->maestro_process = process;
70 simix_global->current_process = process;
76 * \brief Creates and runs a new #smx_process_t.
78 * 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.
80 * \param name a name for the object. It is for user-level information and can be NULL.
81 * \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.
82 * \param host the location where the new agent is executed.
83 * \param argc first argument passed to \a code
84 * \param argv second argument passed to \a code
85 * \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.
87 * \return The new corresponding object.
89 smx_process_t SIMIX_process_create(const char *name,
90 xbt_main_func_t code, void *data,
91 const char *hostname, int argc,
92 char **argv, xbt_dict_t properties)
94 smx_process_t process = NULL;
95 smx_host_t host = SIMIX_host_get_by_name(hostname);
97 DEBUG2("Start process %s on host %s", name, hostname);
99 if (!SIMIX_host_get_state(host)) {
100 WARN2("Cannot launch process '%s' on failed host '%s'", name, hostname);
103 process = xbt_new0(s_smx_process_t, 1);
105 xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
108 process->name = xbt_strdup(name);
109 process->smx_host = host;
110 process->mutex = NULL;
111 process->cond = NULL;
112 process->iwannadie = 0;
113 process->data = data;
115 VERB1("Create context %s", process->name);
116 process->context = SIMIX_context_new(code, argc, argv,
117 simix_global->cleanup_process_function,
120 process->exception = xbt_new(ex_ctx_t, 1);
121 XBT_CTX_INITIALIZE(process->exception);
124 process->properties = properties;
126 /* Add the process to it's host process list */
127 xbt_swag_insert(process, host->process_list);
129 DEBUG1("Start context '%s'", process->name);
130 SIMIX_context_start(process->context);
132 /* Now insert it in the global process list and in the process to run list */
133 xbt_swag_insert(process, simix_global->process_list);
134 DEBUG2("Inserting %s(%s) in the to_run list", process->name, host->name);
135 xbt_swag_insert(process, simix_global->process_to_run);
140 /** \brief Kill a SIMIX process
142 * This function simply kills a \a process... scarry isn't it ? :).
143 * \param process poor victim
146 void SIMIX_process_kill(smx_process_t process)
148 DEBUG2("Killing process %s on %s", process->name, process->smx_host->name);
150 /* Cleanup if we were waiting for something */
152 xbt_swag_remove(process, process->mutex->sleeping);
155 xbt_swag_remove(process, process->cond->sleeping);
157 DEBUG2("%p here! killing %p", simix_global->current_process, process);
159 process->iwannadie = 1;
161 /* If I'm killing myself then stop otherwise schedule the process to kill */
162 if (process == SIMIX_process_self())
163 SIMIX_context_stop(process->context);
165 SIMIX_process_schedule(process);
170 * \brief Return the user data of a #smx_process_t.
172 * 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.
173 * \param process SIMIX process
174 * \return A void pointer to the user data
176 void *SIMIX_process_get_data(smx_process_t process)
178 xbt_assert0((process != NULL), "Invalid parameters");
179 return (process->data);
183 * \brief Set the user data of a #m_process_t.
185 * 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.
186 * \param process SIMIX process
187 * \param data User data
189 void SIMIX_process_set_data(smx_process_t process, void *data)
191 xbt_assert0((process != NULL), "Invalid parameters");
193 process->data = data;
198 * \brief Return the location on which an agent is running.
200 * 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.
201 * \param process SIMIX process
204 smx_host_t SIMIX_process_get_host(smx_process_t process)
206 xbt_assert0((process != NULL), "Invalid parameters");
207 return (process->smx_host);
211 * \brief Return the name of an agent.
213 * This functions checks whether \a process is a valid pointer or not and return its name.
214 * \param process SIMIX process
215 * \return The process name
217 const char *SIMIX_process_get_name(smx_process_t process)
219 xbt_assert0((process != NULL), "Invalid parameters");
220 return (process->name);
224 * \brief Changes the name of an agent.
226 * This functions checks whether \a process is a valid pointer or not and return its name.
227 * \param process SIMIX process
228 * \param name The new process name
230 void SIMIX_process_set_name(smx_process_t process, char *name)
232 xbt_assert0((process != NULL), "Invalid parameters");
233 process->name = name;
236 /** \ingroup m_process_management
237 * \brief Return the properties
239 * This functions returns the properties associated with this process
241 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
243 return process->properties;
247 * \brief Return the current agent.
249 * This functions returns the currently running #smx_process_t.
250 * \return The SIMIX process
252 smx_process_t SIMIX_process_self(void)
254 return simix_global ? simix_global->current_process : NULL;
258 * \brief Suspend the process.
260 * This functions suspend the process by suspending the action on
261 * which it was waiting for the completion.
263 * \param process SIMIX process
265 void SIMIX_process_suspend(smx_process_t process)
267 xbt_assert0(process, "Invalid parameters");
269 if (process != SIMIX_process_self()) {
271 if (process->mutex) {
272 /* process blocked on a mutex, only set suspend=1 */
273 process->suspended = 1;
274 } else if (process->cond) {
275 /* process blocked cond, suspend all actions */
277 /* temporaries variables */
282 process->suspended = 1;
284 xbt_fifo_foreach(c->actions, i, act, smx_action_t) {
285 surf_workstation_model->suspend(act->surf_action);
288 process->suspended = 1;
291 /* process executing, I can create an action and suspend it */
294 char name[] = "dummy";
295 process->suspended = 1;
297 cond = SIMIX_cond_init();
298 dummy = SIMIX_action_execute(SIMIX_process_get_host(process), name, 0);
299 surf_workstation_model->suspend(dummy->surf_action);
300 SIMIX_register_action_to_condition(dummy, cond);
301 __SIMIX_cond_wait(cond);
302 SIMIX_unregister_action_to_condition(dummy, cond);
303 SIMIX_action_destroy(dummy);
304 SIMIX_cond_destroy(cond);
310 * \brief Resume a suspended process.
312 * This functions resume a suspended process by resuming the task on which it was waiting for the completion.
313 * \param process SIMIX process
315 void SIMIX_process_resume(smx_process_t process)
317 xbt_assert0((process != NULL), "Invalid parameters");
320 if (process == SIMIX_process_self())
323 if (process->mutex) {
324 DEBUG0("Resume process blocked on a mutex");
325 process->suspended = 0; /* It'll wake up by itself when mutex releases */
327 } else if (process->cond) {
328 /* temporaries variables */
332 DEBUG0("Resume process blocked on a conditional");
333 process->suspended = 0;
335 xbt_fifo_foreach(c->actions, i, act, smx_action_t) {
336 surf_workstation_model->resume(act->surf_action);
338 SIMIX_cond_signal(c);
341 process->suspended = 0;
342 xbt_swag_insert(process, simix_global->process_to_run);
347 * \brief Migrates an agent to another location.
349 * This function changes the value of the host on which \a process is running.
351 void SIMIX_process_change_host(smx_process_t process, char *source, char *dest)
353 xbt_assert0((process != NULL), "Invalid parameters");
354 smx_host_t h1 = SIMIX_host_get_by_name(source);
355 smx_host_t h2 = SIMIX_host_get_by_name(dest);
356 process->smx_host = h2;
357 xbt_swag_remove(process, h1->process_list);
358 xbt_swag_insert(process, h2->process_list);
362 * \brief Returns true if the process is suspended .
364 * This checks whether a process is suspended or not by inspecting the task on which it was waiting for the completion.
365 * \param process SIMIX process
366 * \return 1, if the process is suspended, else 0.
368 int SIMIX_process_is_suspended(smx_process_t process)
370 xbt_assert0((process != NULL), "Invalid parameters");
372 return (process->suspended);
376 * \brief Returns the amount of SIMIX processes in the system
378 * Maestro internal process is not counted, only user code processes are
380 int SIMIX_process_count()
382 return xbt_swag_size(simix_global->process_list);
386 * Calling this function makes the process process to yield. The process
387 * that scheduled it returns from __SIMIX_process_schedule as if nothing
390 * Only the processes can call this function, giving back the control
393 void SIMIX_process_yield(void)
395 DEBUG1("Yield process '%s'", simix_global->current_process->name);
396 xbt_assert0((simix_global->current_process != simix_global->maestro_process),
397 "You are not supposed to run this function here!");
399 SIMIX_context_suspend(simix_global->current_process->context);
401 if (simix_global->current_process->iwannadie)
402 SIMIX_context_stop(simix_global->current_process->context);
405 void SIMIX_process_schedule(smx_process_t new_process)
407 DEBUG1("Scheduling context: '%s'", new_process->name);
409 /* save the current process */
410 smx_process_t old_process = simix_global->current_process;
412 /* update the current process */
413 simix_global->current_process = new_process;
415 /* schedule the context */
416 SIMIX_context_resume(old_process->context, new_process->context);
418 /* restore the current process to the previously saved process */
419 simix_global->current_process = old_process;
422 /* callback: context fetching */
423 ex_ctx_t *SIMIX_process_get_exception(void)
425 return simix_global->current_process->exception;
428 /* callback: termination */
429 void SIMIX_process_exception_terminate(xbt_ex_t * e)