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;
41 while ((process = xbt_swag_extract(simix_global->process_to_destroy))){
46 for (i = 0; i < process->argc; i++)
48 free(process->argv[i]);
58 * \brief Creates and runs the maestro process
61 void __SIMIX_create_maestro_process()
63 smx_process_t process = NULL;
64 process = xbt_new0(s_smx_process_t, 1);
67 process->name = (char *)"";
69 /* Create the right context type */
70 process->context = SIMIX_context_create_maestro();
72 /* Set it as the maestro process */
73 simix_global->maestro_process = process;
74 simix_global->current_process = process;
80 * \brief Creates and runs a new #smx_process_t.
82 * 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.
84 * \param name a name for the object. It is for user-level information and can be NULL.
85 * \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.
86 * \param host the location where the new agent is executed.
87 * \param argc first argument passed to \a code
88 * \param argv second argument passed to \a code
89 * \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.
91 * \return The new corresponding object.
93 smx_process_t SIMIX_process_create(const char *name,
94 xbt_main_func_t code, void *data,
95 const char *hostname, int argc,
96 char **argv, xbt_dict_t properties)
98 smx_process_t process = NULL;
99 smx_host_t host = SIMIX_host_get_by_name(hostname);
101 DEBUG2("Start process %s on host %s", name, hostname);
103 if (!SIMIX_host_get_state(host)) {
104 WARN2("Cannot launch process '%s' on failed host '%s'", name, hostname);
107 process = xbt_new0(s_smx_process_t, 1);
109 xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
112 process->name = xbt_strdup(name);
113 process->smx_host = host;
114 process->argc = argc;
115 process->argv = argv;
116 process->mutex = NULL;
117 process->cond = NULL;
118 process->iwannadie = 0;
120 VERB1("Create context %s", process->name);
121 process->context = SIMIX_context_new(code);
123 process->data = data;
124 process->cleanup_func = simix_global->cleanup_process_function;
125 process->cleanup_arg = process;
128 process->properties = properties;
130 /* Add the process to it's host process list */
131 xbt_swag_insert(process, host->process_list);
133 DEBUG1("Start context '%s'", process->name);
134 SIMIX_context_start(process->context);
136 /* Now insert it in the global process list and in the process to run list */
137 xbt_swag_insert(process, simix_global->process_list);
138 DEBUG2("Inserting %s(%s) in the to_run list", process->name, host->name);
139 xbt_swag_insert(process, simix_global->process_to_run);
145 * \brief Creates and runs a new #smx_process_t hosting a JAVA thread
147 * Warning: this should only be used in libsimgrid4java, since it create
148 * a context with no code, which leads to segfaults in plain libsimgrid
150 void SIMIX_jprocess_create(const char *name, smx_host_t host,
152 void *jprocess, void *jenv, smx_process_t * res)
154 smx_process_t process = xbt_new0(s_smx_process_t, 1);
155 smx_process_t self = NULL;
157 /* HACK: We need this trick because when we xbt_context_new() do
158 syncronization stuff, the s_process field in the m_process needs
159 to have a valid value, and we call xbt_context_new() before
160 returning, of course, ie, before providing a right value to the
161 caller (Java_simgrid_msg_Msg_processCreate) have time to store it
162 in place. This way, we initialize the m_process->simdata->s_process
165 All this would be much simpler if the synchronization stuff would be done
166 in the JAVA world, I think.
170 DEBUG5("jprocess_create(name=%s,host=%p,data=%p,jproc=%p,jenv=%p)",
171 name, host, data, jprocess, jenv);
172 xbt_assert0(host, "Invalid parameters");
175 process->name = xbt_strdup(name);
176 process->smx_host = host;
178 process->argv = NULL;
179 process->mutex = NULL;
180 process->cond = NULL;
181 SIMIX_context_new(jprocess);
182 process->data = data;
184 /* Add the process to it's host process list */
185 xbt_swag_insert(&process, host->process_list);
187 /* fix current_process, about which xbt_context_start mocks around */
188 self = simix_global->current_process;
189 SIMIX_context_start(process->context);
190 simix_global->current_process = self;
192 /* Now insert it in the global process list and in the process to run list */
193 xbt_swag_insert(process, simix_global->process_list);
194 DEBUG2("Inserting %s(%s) in the to_run list", process->name, host->name);
195 xbt_swag_insert(process, simix_global->process_to_run);
198 /** \brief Kill a SIMIX process
200 * This function simply kills a \a process... scarry isn't it ? :).
201 * \param process poor victim
204 void SIMIX_process_kill(smx_process_t process)
206 DEBUG2("Killing process %s on %s", process->name, process->smx_host->name);
208 /* Cleanup if we were waiting for something */
210 xbt_swag_remove(process, process->mutex->sleeping);
213 xbt_swag_remove(process, process->cond->sleeping);
215 DEBUG2("%p here! killing %p", simix_global->current_process, process);
217 process->iwannadie = 1;
219 /* If I'm killing myself then stop otherwise schedule the process to kill */
220 if (process == SIMIX_process_self())
221 SIMIX_context_stop(1);
223 __SIMIX_process_schedule(process);
228 * \brief Return the user data of a #smx_process_t.
230 * 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.
231 * \param process SIMIX process
232 * \return A void pointer to the user data
234 void *SIMIX_process_get_data(smx_process_t process)
236 xbt_assert0((process != NULL), "Invalid parameters");
237 return (process->data);
241 * \brief Set the user data of a #m_process_t.
243 * 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.
244 * \param process SIMIX process
245 * \param data User data
247 void SIMIX_process_set_data(smx_process_t process, void *data)
249 xbt_assert0((process != NULL), "Invalid parameters");
251 process->data = data;
256 * \brief Return the location on which an agent is running.
258 * 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.
259 * \param process SIMIX process
262 smx_host_t SIMIX_process_get_host(smx_process_t process)
264 xbt_assert0((process != NULL), "Invalid parameters");
265 return (process->smx_host);
269 * \brief Return 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 * \return The process name
275 const char *SIMIX_process_get_name(smx_process_t process)
277 xbt_assert0((process != NULL), "Invalid parameters");
278 return (process->name);
282 * \brief Changes the name of an agent.
284 * This functions checks whether \a process is a valid pointer or not and return its name.
285 * \param process SIMIX process
286 * \param name The new process name
288 void SIMIX_process_set_name(smx_process_t process, char *name)
290 xbt_assert0((process != NULL), "Invalid parameters");
291 process->name = name;
294 /** \ingroup m_process_management
295 * \brief Return the properties
297 * This functions returns the properties associated with this process
299 xbt_dict_t SIMIX_process_get_properties(smx_process_t process)
301 return process->properties;
305 * \brief Return the current agent.
307 * This functions returns the currently running #smx_process_t.
308 * \return The SIMIX process
310 smx_process_t SIMIX_process_self(void)
312 return simix_global ? simix_global->current_process : NULL;
316 * \brief Suspend the process.
318 * This functions suspend the process by suspending the action on
319 * which it was waiting for the completion.
321 * \param process SIMIX process
323 void SIMIX_process_suspend(smx_process_t process)
325 xbt_assert0(process, "Invalid parameters");
327 if (process != SIMIX_process_self()) {
329 if (process->mutex) {
330 /* process blocked on a mutex, only set suspend=1 */
331 process->suspended = 1;
332 } else if (process->cond) {
333 /* process blocked cond, suspend all actions */
335 /* temporaries variables */
340 process->suspended = 1;
342 xbt_fifo_foreach(c->actions, i, act, smx_action_t) {
343 surf_workstation_model->suspend(act->surf_action);
346 process->suspended = 1;
349 /* process executing, I can create an action and suspend it */
352 char name[] = "dummy";
353 process->suspended = 1;
355 cond = SIMIX_cond_init();
356 dummy = SIMIX_action_execute(SIMIX_process_get_host(process), name, 0);
357 surf_workstation_model->suspend(dummy->surf_action);
358 SIMIX_register_action_to_condition(dummy, cond);
359 __SIMIX_cond_wait(cond);
360 SIMIX_unregister_action_to_condition(dummy, cond);
361 SIMIX_action_destroy(dummy);
362 SIMIX_cond_destroy(cond);
368 * \brief Resume a suspended process.
370 * This functions resume a suspended process by resuming the task on which it was waiting for the completion.
371 * \param process SIMIX process
373 void SIMIX_process_resume(smx_process_t process)
375 xbt_assert0((process != NULL), "Invalid parameters");
378 if (process == SIMIX_process_self())
381 if (process->mutex) {
382 DEBUG0("Resume process blocked on a mutex");
383 process->suspended = 0; /* It'll wake up by itself when mutex releases */
385 } else if (process->cond) {
386 /* temporaries variables */
390 DEBUG0("Resume process blocked on a conditional");
391 process->suspended = 0;
393 xbt_fifo_foreach(c->actions, i, act, smx_action_t) {
394 surf_workstation_model->resume(act->surf_action);
396 SIMIX_cond_signal(c);
399 process->suspended = 0;
400 xbt_swag_insert(process, simix_global->process_to_run);
405 * \brief Migrates an agent to another location.
407 * This function changes the value of the host on which \a process is running.
409 void SIMIX_process_change_host(smx_process_t process, char *source, char *dest)
411 xbt_assert0((process != NULL), "Invalid parameters");
412 smx_host_t h1 = SIMIX_host_get_by_name(source);
413 smx_host_t h2 = SIMIX_host_get_by_name(dest);
414 process->smx_host = h2;
415 xbt_swag_remove(process, h1->process_list);
416 xbt_swag_insert(process, h2->process_list);
420 * \brief Returns true if the process is suspended .
422 * This checks whether a process is suspended or not by inspecting the task on which it was waiting for the completion.
423 * \param process SIMIX process
424 * \return 1, if the process is suspended, else 0.
426 int SIMIX_process_is_suspended(smx_process_t process)
428 xbt_assert0((process != NULL), "Invalid parameters");
430 return (process->suspended);
434 * \brief Returns the amount of SIMIX processes in the system
436 * Maestro internal process is not counted, only user code processes are
438 int SIMIX_process_count()
440 return xbt_swag_size(simix_global->process_list);
444 * Calling this function makes the process process to yield. The process
445 * that scheduled it returns from __SIMIX_process_schedule as if nothing
448 * Only the processes can call this function, giving back the control
451 void __SIMIX_process_yield(void)
453 DEBUG1("Yield process '%s'", simix_global->current_process->name);
454 xbt_assert0((simix_global->current_process != simix_global->maestro_process),
455 "You are not supposed to run this function here!");
457 SIMIX_context_suspend(simix_global->current_process->context);
459 if (simix_global->current_process->iwannadie)
460 SIMIX_context_stop(1);
463 void __SIMIX_process_schedule(smx_process_t new_process)
465 DEBUG1("Scheduling context: '%s'", new_process->name);
467 /* save the current process */
468 smx_process_t old_process = simix_global->current_process;
470 /* update the current process */
471 simix_global->current_process = new_process;
473 /* schedule the context */
474 SIMIX_context_resume(old_process->context, new_process->context);
476 /* restore the current process to the previously saved process */
477 simix_global->current_process = old_process;