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. *
22 void SIMIX_process_cleanup(void *arg)
24 xbt_swag_remove(arg, simix_global->process_to_run);
25 xbt_swag_remove(arg, simix_global->process_list);
26 xbt_swag_remove(arg, ((smx_process_t)arg)->smx_host->process_list);
27 xbt_swag_insert(arg, simix_global->process_to_destroy);
33 * Should be called some time to time to free the memory allocated for processes
34 * that have finished (or killed).
36 void SIMIX_process_empty_trash(void)
38 smx_process_t process = NULL;
40 while ((process = xbt_swag_extract(simix_global->process_to_destroy))){
41 SIMIX_context_free(process->context);
49 * \brief Creates and runs the maestro process
52 void __SIMIX_create_maestro_process()
54 smx_process_t process = NULL;
55 process = xbt_new0(s_smx_process_t, 1);
58 process->name = (char *)"";
60 /* Create the right context type */
61 process->context = SIMIX_context_create_maestro();
63 /* Set it as the maestro process */
64 simix_global->maestro_process = process;
65 simix_global->current_process = process;
71 * \brief Creates and runs a new #smx_process_t.
73 * 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.
75 * \param name a name for the object. It is for user-level information and can be NULL.
76 * \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.
77 * \param host the location where the new agent is executed.
78 * \param argc first argument passed to \a code
79 * \param argv second argument passed to \a code
80 * \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.
82 * \return The new corresponding object.
84 smx_process_t SIMIX_process_create(const char *name,
85 xbt_main_func_t code, void *data,
86 const char *hostname, int argc,
87 char **argv, xbt_dict_t properties)
89 smx_process_t process = NULL;
90 smx_host_t host = SIMIX_host_get_by_name(hostname);
92 DEBUG2("Start process %s on host %s", name, hostname);
94 if (!SIMIX_host_get_state(host)) {
95 WARN2("Cannot launch process '%s' on failed host '%s'", name, hostname);
98 process = xbt_new0(s_smx_process_t, 1);
100 xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
103 process->name = xbt_strdup(name);
104 process->smx_host = host;
105 process->mutex = NULL;
106 process->cond = NULL;
107 process->iwannadie = 0;
109 VERB1("Create context %s", process->name);
110 process->context = SIMIX_context_new(code, argc, argv,
111 simix_global->cleanup_process_function,
114 process->data = data;
117 process->properties = properties;
119 /* Add the process to it's host process list */
120 xbt_swag_insert(process, host->process_list);
122 DEBUG1("Start context '%s'", process->name);
123 SIMIX_context_start(process->context);
125 /* Now insert it in the global process list and in the process to run list */
126 xbt_swag_insert(process, simix_global->process_list);
127 DEBUG2("Inserting %s(%s) in the to_run list", process->name, host->name);
128 xbt_swag_insert(process, simix_global->process_to_run);
134 * \brief Creates and runs a new #smx_process_t hosting a JAVA thread
136 * Warning: this should only be used in libsimgrid4java, since it create
137 * a context with no code, which leads to segfaults in plain libsimgrid
139 void SIMIX_jprocess_create(const char *name, smx_host_t host,
141 void *jprocess, void *jenv, smx_process_t * res)
143 smx_process_t process = xbt_new0(s_smx_process_t, 1);
144 smx_process_t self = NULL;
146 /* HACK: We need this trick because when we xbt_context_new() do
147 syncronization stuff, the s_process field in the m_process needs
148 to have a valid value, and we call xbt_context_new() before
149 returning, of course, ie, before providing a right value to the
150 caller (Java_simgrid_msg_Msg_processCreate) have time to store it
151 in place. This way, we initialize the m_process->simdata->s_process
154 All this would be much simpler if the synchronization stuff would be done
155 in the JAVA world, I think.
159 DEBUG5("jprocess_create(name=%s,host=%p,data=%p,jproc=%p,jenv=%p)",
160 name, host, data, jprocess, jenv);
161 xbt_assert0(host, "Invalid parameters");
164 process->name = xbt_strdup(name);
165 process->smx_host = host;
166 process->mutex = NULL;
167 process->cond = NULL;
168 SIMIX_context_new(jprocess, 0, NULL, NULL, NULL);
169 process->data = data;
171 /* Add the process to it's host process list */
172 xbt_swag_insert(&process, host->process_list);
174 /* fix current_process, about which xbt_context_start mocks around */
175 self = simix_global->current_process;
176 SIMIX_context_start(process->context);
177 simix_global->current_process = self;
179 /* Now insert it in the global process list and in the process to run list */
180 xbt_swag_insert(process, simix_global->process_list);
181 DEBUG2("Inserting %s(%s) in the to_run list", process->name, host->name);
182 xbt_swag_insert(process, simix_global->process_to_run);
185 /** \brief Kill a SIMIX process
187 * This function simply kills a \a process... scarry isn't it ? :).
188 * \param process poor victim
191 void SIMIX_process_kill(smx_process_t process)
193 DEBUG2("Killing process %s on %s", process->name, process->smx_host->name);
195 /* Cleanup if we were waiting for something */
197 xbt_swag_remove(process, process->mutex->sleeping);
200 xbt_swag_remove(process, process->cond->sleeping);
202 DEBUG2("%p here! killing %p", simix_global->current_process, process);
204 process->iwannadie = 1;
206 /* If I'm killing myself then stop otherwise schedule the process to kill */
207 if (process == SIMIX_process_self())
208 SIMIX_context_stop(process->context);
210 __SIMIX_process_schedule(process);
215 * \brief Return the user data of a #smx_process_t.
217 * 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.
218 * \param process SIMIX process
219 * \return A void pointer to the user data
221 void *SIMIX_process_get_data(smx_process_t process)
223 xbt_assert0((process != NULL), "Invalid parameters");
224 return (process->data);
228 * \brief Set the user data of a #m_process_t.
230 * 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.
231 * \param process SIMIX process
232 * \param data User data
234 void SIMIX_process_set_data(smx_process_t process, void *data)
236 xbt_assert0((process != NULL), "Invalid parameters");
238 process->data = data;
243 * \brief Return the location on which an agent is running.
245 * 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.
246 * \param process SIMIX process
249 smx_host_t SIMIX_process_get_host(smx_process_t process)
251 xbt_assert0((process != NULL), "Invalid parameters");
252 return (process->smx_host);
256 * \brief Return the name of an agent.
258 * This functions checks whether \a process is a valid pointer or not and return its name.
259 * \param process SIMIX process
260 * \return The process name
262 const char *SIMIX_process_get_name(smx_process_t process)
264 xbt_assert0((process != NULL), "Invalid parameters");
265 return (process->name);
269 * \brief Changes the name of an agent.
271 * This functions checks whether \a process is a valid pointer or not and return its name.
272 * \param process SIMIX process
273 * \param name The new process name
275 void SIMIX_process_set_name(smx_process_t process, char *name)
277 xbt_assert0((process != NULL), "Invalid parameters");
278 process->name = name;
281 /** \ingroup m_process_management
282 * \brief Return the properties
284 * This functions returns the properties associated with this process
286 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
288 return process->properties;
292 * \brief Return the current agent.
294 * This functions returns the currently running #smx_process_t.
295 * \return The SIMIX process
297 smx_process_t SIMIX_process_self(void)
299 return simix_global ? simix_global->current_process : NULL;
303 * \brief Suspend the process.
305 * This functions suspend the process by suspending the action on
306 * which it was waiting for the completion.
308 * \param process SIMIX process
310 void SIMIX_process_suspend(smx_process_t process)
312 xbt_assert0(process, "Invalid parameters");
314 if (process != SIMIX_process_self()) {
316 if (process->mutex) {
317 /* process blocked on a mutex, only set suspend=1 */
318 process->suspended = 1;
319 } else if (process->cond) {
320 /* process blocked cond, suspend all actions */
322 /* temporaries variables */
327 process->suspended = 1;
329 xbt_fifo_foreach(c->actions, i, act, smx_action_t) {
330 surf_workstation_model->suspend(act->surf_action);
333 process->suspended = 1;
336 /* process executing, I can create an action and suspend it */
339 char name[] = "dummy";
340 process->suspended = 1;
342 cond = SIMIX_cond_init();
343 dummy = SIMIX_action_execute(SIMIX_process_get_host(process), name, 0);
344 surf_workstation_model->suspend(dummy->surf_action);
345 SIMIX_register_action_to_condition(dummy, cond);
346 __SIMIX_cond_wait(cond);
347 SIMIX_unregister_action_to_condition(dummy, cond);
348 SIMIX_action_destroy(dummy);
349 SIMIX_cond_destroy(cond);
355 * \brief Resume a suspended process.
357 * This functions resume a suspended process by resuming the task on which it was waiting for the completion.
358 * \param process SIMIX process
360 void SIMIX_process_resume(smx_process_t process)
362 xbt_assert0((process != NULL), "Invalid parameters");
365 if (process == SIMIX_process_self())
368 if (process->mutex) {
369 DEBUG0("Resume process blocked on a mutex");
370 process->suspended = 0; /* It'll wake up by itself when mutex releases */
372 } else if (process->cond) {
373 /* temporaries variables */
377 DEBUG0("Resume process blocked on a conditional");
378 process->suspended = 0;
380 xbt_fifo_foreach(c->actions, i, act, smx_action_t) {
381 surf_workstation_model->resume(act->surf_action);
383 SIMIX_cond_signal(c);
386 process->suspended = 0;
387 xbt_swag_insert(process, simix_global->process_to_run);
392 * \brief Migrates an agent to another location.
394 * This function changes the value of the host on which \a process is running.
396 void SIMIX_process_change_host(smx_process_t process, char *source, char *dest)
398 xbt_assert0((process != NULL), "Invalid parameters");
399 smx_host_t h1 = SIMIX_host_get_by_name(source);
400 smx_host_t h2 = SIMIX_host_get_by_name(dest);
401 process->smx_host = h2;
402 xbt_swag_remove(process, h1->process_list);
403 xbt_swag_insert(process, h2->process_list);
407 * \brief Returns true if the process is suspended .
409 * This checks whether a process is suspended or not by inspecting the task on which it was waiting for the completion.
410 * \param process SIMIX process
411 * \return 1, if the process is suspended, else 0.
413 int SIMIX_process_is_suspended(smx_process_t process)
415 xbt_assert0((process != NULL), "Invalid parameters");
417 return (process->suspended);
421 * \brief Returns the amount of SIMIX processes in the system
423 * Maestro internal process is not counted, only user code processes are
425 int SIMIX_process_count()
427 return xbt_swag_size(simix_global->process_list);
431 * Calling this function makes the process process to yield. The process
432 * that scheduled it returns from __SIMIX_process_schedule as if nothing
435 * Only the processes can call this function, giving back the control
438 void __SIMIX_process_yield(void)
440 DEBUG1("Yield process '%s'", simix_global->current_process->name);
441 xbt_assert0((simix_global->current_process != simix_global->maestro_process),
442 "You are not supposed to run this function here!");
444 SIMIX_context_suspend(simix_global->current_process->context);
446 if (simix_global->current_process->iwannadie)
447 SIMIX_context_stop(simix_global->current_process->context);
450 void __SIMIX_process_schedule(smx_process_t new_process)
452 DEBUG1("Scheduling context: '%s'", new_process->name);
454 /* save the current process */
455 smx_process_t old_process = simix_global->current_process;
457 /* update the current process */
458 simix_global->current_process = new_process;
460 /* schedule the context */
461 SIMIX_context_resume(old_process->context, new_process->context);
463 /* restore the current process to the previously saved process */
464 simix_global->current_process = old_process;