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)");
17 /******************************** Process ************************************/
19 * \brief Move a process to the list of process to destroy. *
21 void SIMIX_process_cleanup(void *arg)
23 xbt_swag_remove(arg, simix_global->process_to_run);
24 xbt_swag_remove(arg, simix_global->process_list);
25 xbt_swag_remove(arg, ((smx_process_t)arg)->smx_host->process_list);
26 xbt_swag_insert(arg, simix_global->process_to_destroy);
32 * Should be called some time to time to free the memory allocated for processes
33 * that have finished (or killed).
35 void SIMIX_process_empty_trash(void)
37 smx_process_t process = NULL;
39 while ((process = xbt_swag_extract(simix_global->process_to_destroy))){
40 SIMIX_context_free(process->context);
48 * \brief Creates and runs the maestro process
50 void __SIMIX_create_maestro_process()
52 smx_process_t process = NULL;
53 process = xbt_new0(s_smx_process_t, 1);
56 process->name = (char *)"";
58 /* Create the right context type */
59 process->context = SIMIX_context_create_maestro();
61 /* Set it as the maestro process */
62 simix_global->maestro_process = process;
63 simix_global->current_process = process;
69 * \brief Creates and runs a new #smx_process_t.
71 * 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.
73 * \param name a name for the object. It is for user-level information and can be NULL.
74 * \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.
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
78 * \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.
80 * \return The new corresponding object.
82 smx_process_t SIMIX_process_create(const char *name,
83 xbt_main_func_t code, void *data,
84 const char *hostname, int argc,
85 char **argv, xbt_dict_t properties)
87 smx_process_t process = NULL;
88 smx_host_t host = SIMIX_host_get_by_name(hostname);
90 DEBUG2("Start process %s on host %s", name, hostname);
92 if (!SIMIX_host_get_state(host)) {
93 WARN2("Cannot launch process '%s' on failed host '%s'", name, hostname);
96 process = xbt_new0(s_smx_process_t, 1);
98 xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
101 process->name = xbt_strdup(name);
102 process->smx_host = host;
103 process->mutex = NULL;
104 process->cond = NULL;
105 process->iwannadie = 0;
107 VERB1("Create context %s", process->name);
108 process->context = SIMIX_context_new(code, argc, argv,
109 simix_global->cleanup_process_function,
112 process->data = data;
115 process->properties = properties;
117 /* Add the process to it's host process list */
118 xbt_swag_insert(process, host->process_list);
120 DEBUG1("Start context '%s'", process->name);
121 SIMIX_context_start(process->context);
123 /* Now insert it in the global process list and in the process to run list */
124 xbt_swag_insert(process, simix_global->process_list);
125 DEBUG2("Inserting %s(%s) in the to_run list", process->name, host->name);
126 xbt_swag_insert(process, simix_global->process_to_run);
132 * \brief Creates and runs a new #smx_process_t hosting a JAVA thread
134 * Warning: this should only be used in libsimgrid4java, since it create
135 * a context with no code, which leads to segfaults in plain libsimgrid
137 void SIMIX_jprocess_create(const char *name, smx_host_t host,
139 void *jprocess, void *jenv, smx_process_t * res)
141 smx_process_t process = xbt_new0(s_smx_process_t, 1);
142 smx_process_t self = NULL;
144 /* HACK: We need this trick because when we xbt_context_new() do
145 syncronization stuff, the s_process field in the m_process needs
146 to have a valid value, and we call xbt_context_new() before
147 returning, of course, ie, before providing a right value to the
148 caller (Java_simgrid_msg_Msg_processCreate) have time to store it
149 in place. This way, we initialize the m_process->simdata->s_process
152 All this would be much simpler if the synchronization stuff would be done
153 in the JAVA world, I think.
157 DEBUG5("jprocess_create(name=%s,host=%p,data=%p,jproc=%p,jenv=%p)",
158 name, host, data, jprocess, jenv);
159 xbt_assert0(host, "Invalid parameters");
162 process->name = xbt_strdup(name);
163 process->smx_host = host;
164 process->mutex = NULL;
165 process->cond = NULL;
166 SIMIX_context_new(jprocess, 0, NULL, NULL, NULL);
167 process->data = data;
169 /* Add the process to it's host process list */
170 xbt_swag_insert(&process, host->process_list);
172 /* fix current_process, about which xbt_context_start mocks around */
173 self = simix_global->current_process;
174 SIMIX_context_start(process->context);
175 simix_global->current_process = self;
177 /* Now insert it in the global process list and in the process to run list */
178 xbt_swag_insert(process, simix_global->process_list);
179 DEBUG2("Inserting %s(%s) in the to_run list", process->name, host->name);
180 xbt_swag_insert(process, simix_global->process_to_run);
183 /** \brief Kill a SIMIX process
185 * This function simply kills a \a process... scarry isn't it ? :).
186 * \param process poor victim
189 void SIMIX_process_kill(smx_process_t process)
191 DEBUG2("Killing process %s on %s", process->name, process->smx_host->name);
193 /* Cleanup if we were waiting for something */
195 xbt_swag_remove(process, process->mutex->sleeping);
198 xbt_swag_remove(process, process->cond->sleeping);
200 DEBUG2("%p here! killing %p", simix_global->current_process, process);
202 process->iwannadie = 1;
204 /* If I'm killing myself then stop otherwise schedule the process to kill */
205 if (process == SIMIX_process_self())
206 SIMIX_context_stop(process->context);
208 __SIMIX_process_schedule(process);
213 * \brief Return the user data of a #smx_process_t.
215 * 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.
216 * \param process SIMIX process
217 * \return A void pointer to the user data
219 void *SIMIX_process_get_data(smx_process_t process)
221 xbt_assert0((process != NULL), "Invalid parameters");
222 return (process->data);
226 * \brief Set the user data of a #m_process_t.
228 * 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.
229 * \param process SIMIX process
230 * \param data User data
232 void SIMIX_process_set_data(smx_process_t process, void *data)
234 xbt_assert0((process != NULL), "Invalid parameters");
236 process->data = data;
241 * \brief Return the location on which an agent is running.
243 * 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.
244 * \param process SIMIX process
247 smx_host_t SIMIX_process_get_host(smx_process_t process)
249 xbt_assert0((process != NULL), "Invalid parameters");
250 return (process->smx_host);
254 * \brief Return the name of an agent.
256 * This functions checks whether \a process is a valid pointer or not and return its name.
257 * \param process SIMIX process
258 * \return The process name
260 const char *SIMIX_process_get_name(smx_process_t process)
262 xbt_assert0((process != NULL), "Invalid parameters");
263 return (process->name);
267 * \brief Changes the name of an agent.
269 * This functions checks whether \a process is a valid pointer or not and return its name.
270 * \param process SIMIX process
271 * \param name The new process name
273 void SIMIX_process_set_name(smx_process_t process, char *name)
275 xbt_assert0((process != NULL), "Invalid parameters");
276 process->name = name;
279 /** \ingroup m_process_management
280 * \brief Return the properties
282 * This functions returns the properties associated with this process
284 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
286 return process->properties;
290 * \brief Return the current agent.
292 * This functions returns the currently running #smx_process_t.
293 * \return The SIMIX process
295 smx_process_t SIMIX_process_self(void)
297 return simix_global ? simix_global->current_process : NULL;
301 * \brief Suspend the process.
303 * This functions suspend the process by suspending the action on
304 * which it was waiting for the completion.
306 * \param process SIMIX process
308 void SIMIX_process_suspend(smx_process_t process)
310 xbt_assert0(process, "Invalid parameters");
312 if (process != SIMIX_process_self()) {
314 if (process->mutex) {
315 /* process blocked on a mutex, only set suspend=1 */
316 process->suspended = 1;
317 } else if (process->cond) {
318 /* process blocked cond, suspend all actions */
320 /* temporaries variables */
325 process->suspended = 1;
327 xbt_fifo_foreach(c->actions, i, act, smx_action_t) {
328 surf_workstation_model->suspend(act->surf_action);
331 process->suspended = 1;
334 /* process executing, I can create an action and suspend it */
337 char name[] = "dummy";
338 process->suspended = 1;
340 cond = SIMIX_cond_init();
341 dummy = SIMIX_action_execute(SIMIX_process_get_host(process), name, 0);
342 surf_workstation_model->suspend(dummy->surf_action);
343 SIMIX_register_action_to_condition(dummy, cond);
344 __SIMIX_cond_wait(cond);
345 SIMIX_unregister_action_to_condition(dummy, cond);
346 SIMIX_action_destroy(dummy);
347 SIMIX_cond_destroy(cond);
353 * \brief Resume a suspended process.
355 * This functions resume a suspended process by resuming the task on which it was waiting for the completion.
356 * \param process SIMIX process
358 void SIMIX_process_resume(smx_process_t process)
360 xbt_assert0((process != NULL), "Invalid parameters");
363 if (process == SIMIX_process_self())
366 if (process->mutex) {
367 DEBUG0("Resume process blocked on a mutex");
368 process->suspended = 0; /* It'll wake up by itself when mutex releases */
370 } else if (process->cond) {
371 /* temporaries variables */
375 DEBUG0("Resume process blocked on a conditional");
376 process->suspended = 0;
378 xbt_fifo_foreach(c->actions, i, act, smx_action_t) {
379 surf_workstation_model->resume(act->surf_action);
381 SIMIX_cond_signal(c);
384 process->suspended = 0;
385 xbt_swag_insert(process, simix_global->process_to_run);
390 * \brief Migrates an agent to another location.
392 * This function changes the value of the host on which \a process is running.
394 void SIMIX_process_change_host(smx_process_t process, char *source, char *dest)
396 xbt_assert0((process != NULL), "Invalid parameters");
397 smx_host_t h1 = SIMIX_host_get_by_name(source);
398 smx_host_t h2 = SIMIX_host_get_by_name(dest);
399 process->smx_host = h2;
400 xbt_swag_remove(process, h1->process_list);
401 xbt_swag_insert(process, h2->process_list);
405 * \brief Returns true if the process is suspended .
407 * This checks whether a process is suspended or not by inspecting the task on which it was waiting for the completion.
408 * \param process SIMIX process
409 * \return 1, if the process is suspended, else 0.
411 int SIMIX_process_is_suspended(smx_process_t process)
413 xbt_assert0((process != NULL), "Invalid parameters");
415 return (process->suspended);
419 * \brief Returns the amount of SIMIX processes in the system
421 * Maestro internal process is not counted, only user code processes are
423 int SIMIX_process_count()
425 return xbt_swag_size(simix_global->process_list);
429 * Calling this function makes the process process to yield. The process
430 * that scheduled it returns from __SIMIX_process_schedule as if nothing
433 * Only the processes can call this function, giving back the control
436 void __SIMIX_process_yield(void)
438 DEBUG1("Yield process '%s'", simix_global->current_process->name);
439 xbt_assert0((simix_global->current_process != simix_global->maestro_process),
440 "You are not supposed to run this function here!");
442 SIMIX_context_suspend(simix_global->current_process->context);
444 if (simix_global->current_process->iwannadie)
445 SIMIX_context_stop(simix_global->current_process->context);
448 void __SIMIX_process_schedule(smx_process_t new_process)
450 DEBUG1("Scheduling context: '%s'", new_process->name);
452 /* save the current process */
453 smx_process_t old_process = simix_global->current_process;
455 /* update the current process */
456 simix_global->current_process = new_process;
458 /* schedule the context */
459 SIMIX_context_resume(old_process->context, new_process->context);
461 /* restore the current process to the previously saved process */
462 simix_global->current_process = old_process;