1 /* Copyright (c) 2004, 2005, 2006, 2007, 2008, 2009, 2010. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #include "msg_private.h"
8 #include "xbt/sysdep.h"
11 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_process, msg,
12 "Logging specific to MSG (process)");
14 /** @addtogroup m_process_management
15 * \htmlonly <!-- DOXYGEN_NAVBAR_LABEL="Processes" --> \endhtmlonly
17 * We need to simulate many independent scheduling decisions, so
18 * the concept of <em>process</em> is at the heart of the
19 * simulator. A process may be defined as a <em>code</em>, with
20 * some <em>private data</em>, executing in a <em>location</em>.
24 /******************************** Process ************************************/
27 * \brief Cleans the MSG data of a process.
28 * \param smx_proc a SIMIX process
30 void MSG_process_cleanup_from_SIMIX(smx_process_t smx_proc)
32 simdata_process_t msg_proc;
34 // get the MSG process from the SIMIX process
35 if (smx_proc == SIMIX_process_self()) {
36 /* avoid a SIMIX request if this function is called by the process itself */
37 msg_proc = SIMIX_process_self_get_data(smx_proc);
38 SIMIX_process_self_set_data(smx_proc, NULL);
41 msg_proc = simcall_process_get_data(smx_proc);
42 simcall_process_set_data(smx_proc, NULL);
46 TRACE_msg_process_end(smx_proc);
48 // free the data if a function was provided
49 if (msg_proc->data && msg_global->process_data_cleanup) {
50 msg_global->process_data_cleanup(msg_proc->data);
53 // remove the process from its virtual machine
55 int pos = xbt_dynar_search(msg_proc->vm->processes,&smx_proc);
56 xbt_dynar_remove_at(msg_proc->vm->processes,pos, NULL);
59 // free the MSG process
63 /* This function creates a MSG process. It has the prototype enforced by SIMIX_function_register_process_create */
64 void MSG_process_create_from_SIMIX(smx_process_t* process, const char *name,
65 xbt_main_func_t code, void *data,
66 const char *hostname, double kill_time, int argc, char **argv,
67 xbt_dict_t properties, int auto_restart)
69 msg_host_t host = MSG_get_host_by_name(hostname);
70 msg_process_t p = MSG_process_create_with_environment(name, code, data,
74 MSG_process_set_kill_time(p,kill_time);
75 MSG_process_auto_restart_set(p,auto_restart);
77 *((msg_process_t*) process) = p;
80 /** \ingroup m_process_management
81 * \brief Creates and runs a new #msg_process_t.
83 * Does exactly the same as #MSG_process_create_with_arguments but without
84 providing standard arguments (\a argc, \a argv, \a start_time, \a kill_time).
85 * \sa MSG_process_create_with_arguments
87 msg_process_t MSG_process_create(const char *name,
88 xbt_main_func_t code, void *data,
91 return MSG_process_create_with_environment(name, code, data, host, -1,
95 /** \ingroup m_process_management
96 * \brief Creates and runs a new #msg_process_t.
98 * A constructor for #msg_process_t taking four arguments and returning the
99 * corresponding object. The structure (and the corresponding thread) is
100 * created, and put in the list of ready process.
101 * \param name a name for the object. It is for user-level information
103 * \param code is a function describing the behavior of the process. It
104 should then only use functions described in \ref
105 m_process_management (to create a new #msg_process_t for example),
106 in \ref m_host_management (only the read-only functions i.e. whose
107 name contains the word get), in \ref m_task_management (to create
108 or destroy some #msg_task_t for example) and in \ref
109 msg_task_usage (to handle file transfers and task processing).
110 * \param data a pointer to any data one may want to attach to the new
111 object. It is for user-level information and can be NULL. It can
112 be retrieved with the function \ref MSG_process_get_data.
113 * \param host the location where the new process is executed.
114 * \param argc first argument passed to \a code
115 * \param argv second argument passed to \a code
117 * \return The new corresponding object.
120 msg_process_t MSG_process_create_with_arguments(const char *name,
121 xbt_main_func_t code,
122 void *data, msg_host_t host,
123 int argc, char **argv)
125 return MSG_process_create_with_environment(name, code, data, host,
129 /** \ingroup m_process_management
130 * \brief Creates and runs a new #msg_process_t.
132 * A constructor for #msg_process_t taking four arguments and returning the
133 * corresponding object. The structure (and the corresponding thread) is
134 * created, and put in the list of ready process.
135 * \param name a name for the object. It is for user-level information
137 * \param code is a function describing the behavior of the process. It
138 should then only use functions described in \ref
139 m_process_management (to create a new #msg_process_t for example),
140 in \ref m_host_management (only the read-only functions i.e. whose
141 name contains the word get), in \ref m_task_management (to create
142 or destroy some #msg_task_t for example) and in \ref
143 msg_task_usage (to handle file transfers and task processing).
144 * \param data a pointer to any data one may want to attach to the new
145 object. It is for user-level information and can be NULL. It can
146 be retrieved with the function \ref MSG_process_get_data.
147 * \param host the location where the new process is executed.
148 * \param argc first argument passed to \a code
149 * \param argv second argument passed to \a code
150 * \param properties list a properties defined for this process
152 * \return The new corresponding object.
154 msg_process_t MSG_process_create_with_environment(const char *name,
155 xbt_main_func_t code,
156 void *data, msg_host_t host,
157 int argc, char **argv,
158 xbt_dict_t properties)
160 xbt_assert(code != NULL && host != NULL, "Invalid parameters");
161 simdata_process_t simdata = xbt_new0(s_simdata_process_t, 1);
162 msg_process_t process;
164 /* Simulator data for MSG */
165 simdata->PID = msg_global->PID++;
166 simdata->waiting_action = NULL;
167 simdata->waiting_task = NULL;
168 simdata->m_host = host;
169 simdata->argc = argc;
170 simdata->argv = argv;
171 simdata->data = data;
172 simdata->last_errno = MSG_OK;
174 if (SIMIX_process_self()) {
175 simdata->PPID = MSG_process_get_PID(MSG_process_self());
181 TRACE_msg_process_create(name, simdata->PID, simdata->m_host);
183 /* Let's create the process: SIMIX may decide to start it right now,
184 * even before returning the flow control to us */
185 simcall_process_create(&process, name, code, simdata, SIMIX_host_get_name(host->smx_host), -1,
186 argc, argv, properties,0);
189 /* Undo everything we have just changed */
191 TRACE_msg_process_destroy (name, simdata->PID, simdata->m_host);
199 simcall_process_on_exit(process,(int_f_pvoid_t)TRACE_msg_process_kill,MSG_process_self());
205 /** \ingroup m_process_management
206 * \param process poor victim
208 * This function simply kills a \a process... scary isn't it ? :)
210 void MSG_process_kill(msg_process_t process)
212 // /* FIXME: why do we only cancel communication actions? is this useful? */
213 // simdata_process_t p_simdata = simcall_process_get_data(process);
214 // if (p_simdata->waiting_task && p_simdata->waiting_task->simdata->comm) {
215 // simcall_comm_cancel(p_simdata->waiting_task->simdata->comm);
218 simcall_process_kill(process);
223 /** \ingroup m_process_management
224 * \brief Migrates a process to another location.
226 * This function checks whether \a process and \a host are valid pointers
227 and change the value of the #msg_host_t on which \a process is running.
229 msg_error_t MSG_process_migrate(msg_process_t process, msg_host_t host)
231 simdata_process_t simdata = simcall_process_get_data(process);
232 simdata->m_host = host;
234 msg_host_t now = simdata->m_host;
235 TRACE_msg_process_change_host(process, now, host);
237 simcall_process_change_host(process, host->smx_host);
241 /** \ingroup m_process_management
242 * \brief Returns the user data of a process.
244 * This function checks whether \a process is a valid pointer or not
245 and returns the user data associated to this process.
247 void* MSG_process_get_data(msg_process_t process)
249 xbt_assert(process != NULL, "Invalid parameter");
251 /* get from SIMIX the MSG process data, and then the user data */
252 simdata_process_t simdata = simcall_process_get_data(process);
253 return simdata->data;
256 /** \ingroup m_process_management
257 * \brief Sets the user data of a process.
259 * This function checks whether \a process is a valid pointer or not
260 and sets the user data associated to this process.
262 msg_error_t MSG_process_set_data(msg_process_t process, void *data)
264 xbt_assert(process != NULL, "Invalid parameter");
266 simdata_process_t simdata = simcall_process_get_data(process);
267 simdata->data = data;
272 /** \ingroup m_process_management
273 * \brief Sets a cleanup function to be called to free the userdata of a
274 * process when a process is destroyed.
275 * \param data_cleanup a cleanup function for the userdata of a process,
276 * or NULL to call no function
278 XBT_PUBLIC(void) MSG_process_set_data_cleanup(void_f_pvoid_t data_cleanup) {
280 msg_global->process_data_cleanup = data_cleanup;
283 /** \ingroup m_process_management
284 * \brief Return the location on which a process is running.
285 * \param process a process (NULL means the current one)
286 * \return the msg_host_t corresponding to the location on which \a
287 * process is running.
289 msg_host_t MSG_process_get_host(msg_process_t process)
291 simdata_process_t simdata;
292 if (process == NULL) {
293 simdata = SIMIX_process_self_get_data(SIMIX_process_self());
296 simdata = simcall_process_get_data(process);
298 return simdata->m_host;
301 /** \ingroup m_process_management
303 * \brief Return a #msg_process_t given its PID.
305 * This function search in the list of all the created msg_process_t for a msg_process_t
306 whose PID is equal to \a PID. If no host is found, \c NULL is returned.
307 Note that the PID are uniq in the whole simulation, not only on a given host.
309 msg_process_t MSG_process_from_PID(int PID)
311 return SIMIX_process_from_PID(PID);
314 /** @brief returns a list of all currently existing processes */
315 xbt_dynar_t MSG_processes_as_dynar(void) {
316 return SIMIX_processes_as_dynar();
319 /** \ingroup m_process_management
320 * \brief Set the kill time of a process.
322 * \param process a process
323 * \param kill_time the time when the process is killed.
325 msg_error_t MSG_process_set_kill_time(msg_process_t process, double kill_time)
327 simcall_process_set_kill_time(process,kill_time);
331 /** \ingroup m_process_management
332 * \brief Returns the process ID of \a process.
334 * This function checks whether \a process is a valid pointer or not
335 and return its PID (or 0 in case of problem).
337 int MSG_process_get_PID(msg_process_t process)
339 /* Do not raise an exception here: this function is called by the logs
340 * and the exceptions, so it would be called back again and again */
341 if (process == NULL) {
345 simdata_process_t simdata = simcall_process_get_data(process);
347 return simdata != NULL ? simdata->PID : 0;
350 /** \ingroup m_process_management
351 * \brief Returns the process ID of the parent of \a process.
353 * This function checks whether \a process is a valid pointer or not
354 and return its PID. Returns -1 if the process has not been created by
357 int MSG_process_get_PPID(msg_process_t process)
359 xbt_assert(process != NULL, "Invalid parameter");
361 simdata_process_t simdata = simcall_process_get_data(process);
363 return simdata->PPID;
366 /** \ingroup m_process_management
367 * \brief Return the name of a process.
369 * This function checks whether \a process is a valid pointer or not
372 const char *MSG_process_get_name(msg_process_t process)
374 xbt_assert(process, "Invalid parameter");
376 return simcall_process_get_name(process);
379 /** \ingroup m_process_management
380 * \brief Returns the value of a given process property
382 * \param process a process
383 * \param name a property name
384 * \return value of a property (or NULL if the property is not set)
386 const char *MSG_process_get_property_value(msg_process_t process,
389 return xbt_dict_get_or_null(MSG_process_get_properties(process), name);
392 /** \ingroup m_process_management
393 * \brief Return the list of properties
395 * This function returns all the parameters associated with a process
397 xbt_dict_t MSG_process_get_properties(msg_process_t process)
399 xbt_assert(process != NULL, "Invalid parameter");
401 return simcall_process_get_properties(process);
405 /** \ingroup m_process_management
406 * \brief Return the PID of the current process.
408 * This function returns the PID of the currently running #msg_process_t.
410 int MSG_process_self_PID(void)
412 return MSG_process_get_PID(MSG_process_self());
415 /** \ingroup m_process_management
416 * \brief Return the PPID of the current process.
418 * This function returns the PID of the parent of the currently
419 * running #msg_process_t.
421 int MSG_process_self_PPID(void)
423 return MSG_process_get_PPID(MSG_process_self());
426 /** \ingroup m_process_management
427 * \brief Return the current process.
429 * This function returns the currently running #msg_process_t.
431 msg_process_t MSG_process_self(void)
433 return SIMIX_process_self();
436 /** \ingroup m_process_management
437 * \brief Suspend the process.
439 * This function suspends the process by suspending the task on which
440 * it was waiting for the completion.
442 msg_error_t MSG_process_suspend(msg_process_t process)
444 xbt_assert(process != NULL, "Invalid parameter");
447 TRACE_msg_process_suspend(process);
450 simcall_process_suspend(process);
454 /** \ingroup m_process_management
455 * \brief Resume a suspended process.
457 * This function resumes a suspended process by resuming the task on
458 * which it was waiting for the completion.
460 msg_error_t MSG_process_resume(msg_process_t process)
462 xbt_assert(process != NULL, "Invalid parameter");
465 TRACE_msg_process_resume(process);
468 simcall_process_resume(process);
472 /** \ingroup m_process_management
473 * \brief Returns true if the process is suspended .
475 * This checks whether a process is suspended or not by inspecting the
476 * task on which it was waiting for the completion.
478 int MSG_process_is_suspended(msg_process_t process)
480 xbt_assert(process != NULL, "Invalid parameter");
481 return simcall_process_is_suspended(process);
484 smx_context_t MSG_process_get_smx_ctx(msg_process_t process) {
485 return SIMIX_process_get_context(process);
488 * \ingroup m_process_management
489 * \brief Add a function to the list of "on_exit" functions for the current process.
490 * The on_exit functions are the functions executed when your process is killed.
491 * You should use them to free the data used by your process.
493 void MSG_process_on_exit(int_f_pvoid_t fun, void *data) {
494 simcall_process_on_exit(MSG_process_self(),fun,data);
497 * \ingroup m_process_management
498 * \brief Sets the "auto-restart" flag of the process.
499 * If the flag is set to 1, the process will be automatically restarted when
500 * its host comes back up.
502 XBT_PUBLIC(void) MSG_process_auto_restart_set(msg_process_t process, int auto_restart) {
503 simcall_process_auto_restart_set(process,auto_restart);
506 * \ingroup m_process_management
507 * \brief Restarts a process from the beginning.
509 XBT_PUBLIC(msg_process_t) MSG_process_restart(msg_process_t process) {
510 return simcall_process_restart(process);