1 /* Copyright (c) 2004-2015. 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. */
9 #include "msg_private.h"
10 #include "xbt/sysdep.h"
12 #include "src/simix/smx_process_private.h"
13 #include "src/simix/smx_private.h"
15 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_process, msg, "Logging specific to MSG (process)");
17 /** @addtogroup m_process_management
19 * Processes (#msg_process_t) are independent agents that can do stuff on their own. They are in charge of executing
20 * your code interacting with the simulated world.
21 * A process may be defined as a <em>code</em> with some <em>private data</em>.
22 * Processes must be located on <em>hosts</em> (#msg_host_t), and they exchange data by sending tasks (#msg_task_t)
23 * that are similar to envelops containing data.
26 /******************************** Process ************************************/
28 * \brief Cleans the MSG data of a process.
29 * \param smx_proc a SIMIX process
31 void MSG_process_cleanup_from_SIMIX(smx_process_t smx_proc)
33 simdata_process_t msg_proc;
35 // get the MSG process from the SIMIX process
36 if (smx_proc == SIMIX_process_self()) {
37 /* avoid a SIMIX request if this function is called by the process itself */
38 msg_proc = (simdata_process_t) SIMIX_process_self_get_data();
39 SIMIX_process_self_set_data(NULL);
41 msg_proc = (simdata_process_t) simcall_process_get_data(smx_proc);
42 simcall_process_set_data(smx_proc, NULL);
45 TRACE_msg_process_destroy(smx_proc->name.c_str(), smx_proc->pid);
46 // free the data if a function was provided
47 if (msg_proc && msg_proc->data && msg_global->process_data_cleanup) {
48 msg_global->process_data_cleanup(msg_proc->data);
51 // free the MSG process
53 SIMIX_process_cleanup(smx_proc);
56 /* This function creates a MSG process. It has the prototype enforced by SIMIX_function_register_process_create */
57 smx_process_t MSG_process_create_from_SIMIX(
58 const char *name, std::function<void()> code, void *data, const char *hostname,
59 double kill_time, xbt_dict_t properties,
60 int auto_restart, smx_process_t parent_process)
62 msg_host_t host = MSG_host_by_name(hostname);
63 msg_process_t p = MSG_process_create_with_environment(
64 name, std::move(code), data, host, properties);
66 MSG_process_set_kill_time(p,kill_time);
67 MSG_process_auto_restart_set(p,auto_restart);
72 /** \ingroup m_process_management
73 * \brief Creates and runs a new #msg_process_t.
75 * Does exactly the same as #MSG_process_create_with_arguments but without providing standard arguments
76 * (\a argc, \a argv, \a start_time, \a kill_time).
77 * \sa MSG_process_create_with_arguments
79 msg_process_t MSG_process_create(const char *name, xbt_main_func_t code, void *data, msg_host_t host)
81 return MSG_process_create_with_environment(name, code, data, host, 0, NULL, NULL);
84 /** \ingroup m_process_management
85 * \brief Creates and runs a new #msg_process_t.
87 * A constructor for #msg_process_t taking four arguments and returning the corresponding object. The structure (and
88 * the corresponding thread) is created, and put in the list of ready process.
89 * \param name a name for the object. It is for user-level information and can be NULL.
90 * \param code is a function describing the behavior of the process. It should then only use functions described
91 * in \ref m_process_management (to create a new #msg_process_t for example),
92 in \ref m_host_management (only the read-only functions i.e. whose name contains the word get),
93 in \ref m_task_management (to create or destroy some #msg_task_t for example) and
94 in \ref msg_task_usage (to handle file transfers and task processing).
95 * \param data a pointer to any data one may want to attach to the new object. It is for user-level information and
96 * can be NULL. It can be retrieved with the function \ref MSG_process_get_data.
97 * \param host the location where the new process is executed.
98 * \param argc first argument passed to \a code
99 * \param argv second argument passed to \a code
101 * \return The new corresponding object.
104 msg_process_t MSG_process_create_with_arguments(const char *name, xbt_main_func_t code, void *data, msg_host_t host,
105 int argc, char **argv)
107 return MSG_process_create_with_environment(name, code, data, host, argc, argv, NULL);
110 /** \ingroup m_process_management
111 * \brief Creates and runs a new #msg_process_t.
113 * A constructor for #msg_process_t taking four arguments and returning the corresponding object. The structure (and
114 * the corresponding thread) is created, and put in the list of ready process.
115 * \param name a name for the object. It is for user-level information and can be NULL.
116 * \param code is a function describing the behavior of the process. It should then only use functions described
117 * in \ref m_process_management (to create a new #msg_process_t for example),
118 in \ref m_host_management (only the read-only functions i.e. whose name contains the word get),
119 in \ref m_task_management (to create or destroy some #msg_task_t for example) and
120 in \ref msg_task_usage (to handle file transfers and task processing).
121 * \param data a pointer to any data one may want to attach to the new object. It is for user-level information and
122 * can be NULL. It can be retrieved with the function \ref MSG_process_get_data.
123 * \param host the location where the new process is executed.
124 * \param argc first argument passed to \a code
125 * \param argv second argument passed to \a code. WARNING, these strings are freed by the SimGrid kernel when the
126 * process exits, so they cannot be static nor shared between several processes.
127 * \param properties list a properties defined for this process
129 * \return The new corresponding object.
131 msg_process_t MSG_process_create_with_environment(const char *name, xbt_main_func_t code, void *data, msg_host_t host,
132 int argc, char **argv, xbt_dict_t properties)
134 msg_process_t res = MSG_process_create_with_environment(name,
135 simgrid::simix::wrap_main(code, argc, argv), data, host,
137 for (int i = 0; i != argc; ++i)
143 msg_process_t MSG_process_create_with_environment(
144 const char *name, std::function<void()> code, void *data,
145 msg_host_t host, xbt_dict_t properties)
147 xbt_assert(code != NULL && host != NULL, "Invalid parameters: host and code params must not be NULL");
148 simdata_process_t simdata = xbt_new0(s_simdata_process_t, 1);
149 msg_process_t process;
151 /* Simulator data for MSG */
152 simdata->waiting_action = NULL;
153 simdata->waiting_task = NULL;
154 simdata->m_host = host;
155 simdata->data = data;
156 simdata->last_errno = MSG_OK;
158 /* Let's create the process: SIMIX may decide to start it right now,
159 * even before returning the flow control to us */
160 process = simcall_process_create(
161 name, std::move(code), simdata, sg_host_get_name(host), -1, properties, 0);
164 /* Undo everything we have just changed */
169 simcall_process_on_exit(process,(int_f_pvoid_pvoid_t)TRACE_msg_process_kill,process);
174 static int MSG_maestro(int argc, char** argv)
176 int res = MSG_main();
180 /* Become a process in the simulation
182 * Currently this can only be called by the main thread (once) and only work with some thread factories
183 * (currently ThreadContextFactory).
185 * In the future, it might be extended in order to attach other threads created by a third party library.
187 msg_process_t MSG_process_attach(const char *name, void *data, msg_host_t host, xbt_dict_t properties)
189 xbt_assert(host != NULL, "Invalid parameters: host and code params must not be NULL");
190 simdata_process_t simdata = xbt_new0(s_simdata_process_t, 1);
191 msg_process_t process;
193 /* Simulator data for MSG */
194 simdata->waiting_action = NULL;
195 simdata->waiting_task = NULL;
196 simdata->m_host = host;
197 simdata->data = data;
198 simdata->last_errno = MSG_OK;
200 /* Let's create the process: SIMIX may decide to start it right now, even before returning the flow control to us */
201 process = SIMIX_process_attach(name, simdata, sg_host_get_name(host), properties, NULL);
203 xbt_die("Could not attach");
204 simcall_process_on_exit(process,(int_f_pvoid_pvoid_t)TRACE_msg_process_kill,process);
208 /** Detach a process attached with `MSG_process_attach()`
210 * This is called when the current process has finished its job.
211 * Used in the main thread, it waits for the simulation to finish before returning. When it returns, the other
212 * simulated processes and the maestro are destroyed.
214 void MSG_process_detach(void)
216 SIMIX_process_detach();
219 /** \ingroup m_process_management
220 * \param process poor victim
222 * This function simply kills a \a process... scary isn't it ? :)
224 void MSG_process_kill(msg_process_t process)
226 // /* FIXME: why do we only cancel communication actions? is this useful? */
227 // simdata_process_t p_simdata = simcall_process_get_data(process);
228 // if (p_simdata->waiting_task && p_simdata->waiting_task->simdata->comm) {
229 // simcall_comm_cancel(p_simdata->waiting_task->simdata->comm);
231 simcall_process_kill(process);
235 * \brief Wait for the completion of a #msg_process_t.
237 * \param process the process to wait for
238 * \param timeout wait until the process is over, or the timeout occurs
240 msg_error_t MSG_process_join(msg_process_t process, double timeout){
241 simcall_process_join(process, timeout);
245 /** \ingroup m_process_management
246 * \brief Migrates a process to another location.
248 * This function checks whether \a process and \a host are valid pointers and change the value of the #msg_host_t on
249 * which \a process is running.
251 msg_error_t MSG_process_migrate(msg_process_t process, msg_host_t host)
253 simdata_process_t simdata = (simdata_process_t) simcall_process_get_data(process);
254 simdata->m_host = host;
255 msg_host_t now = simdata->m_host;
256 TRACE_msg_process_change_host(process, now, host);
257 simcall_process_set_host(process, host);
261 /** \ingroup m_process_management
262 * \brief Returns the user data of a process.
264 * This function checks whether \a process is a valid pointer and returns the user data associated to this process.
266 void* MSG_process_get_data(msg_process_t process)
268 xbt_assert(process != NULL, "Invalid parameter: first parameter must not be NULL!");
270 /* get from SIMIX the MSG process data, and then the user data */
271 simdata_process_t simdata = (simdata_process_t) simcall_process_get_data(process);
273 return simdata->data;
278 /** \ingroup m_process_management
279 * \brief Sets the user data of a process.
281 * This function checks whether \a process is a valid pointer and sets the user data associated to this process.
283 msg_error_t MSG_process_set_data(msg_process_t process, void *data)
285 xbt_assert(process != NULL, "Invalid parameter: first parameter must not be NULL!");
287 simdata_process_t simdata = (simdata_process_t) simcall_process_get_data(process);
288 simdata->data = data;
293 /** \ingroup m_process_management
294 * \brief Sets a cleanup function to be called to free the userdata of a process when a process is destroyed.
295 * \param data_cleanup a cleanup function for the userdata of a process, or NULL to call no function
297 XBT_PUBLIC(void) MSG_process_set_data_cleanup(void_f_pvoid_t data_cleanup) {
298 msg_global->process_data_cleanup = data_cleanup;
301 /** \ingroup m_process_management
302 * \brief Return the location on which a process is running.
303 * \param process a process (NULL means the current one)
304 * \return the msg_host_t corresponding to the location on which \a process is running.
306 msg_host_t MSG_process_get_host(msg_process_t process)
308 simdata_process_t simdata;
309 if (process == NULL) {
310 simdata = (simdata_process_t) SIMIX_process_self_get_data();
313 simdata = (simdata_process_t) simcall_process_get_data(process);
315 return simdata ? simdata->m_host : NULL;
318 /** \ingroup m_process_management
320 * \brief Return a #msg_process_t given its PID.
322 * This function search in the list of all the created msg_process_t for a msg_process_t whose PID is equal to \a PID.
323 * If no host is found, \c NULL is returned.
324 Note that the PID are uniq in the whole simulation, not only on a given host.
326 msg_process_t MSG_process_from_PID(int PID)
328 return SIMIX_process_from_PID(PID);
331 /** @brief returns a list of all currently existing processes */
332 xbt_dynar_t MSG_processes_as_dynar(void) {
333 return SIMIX_processes_as_dynar();
336 /** @brief Return the current number MSG processes. */
337 int MSG_process_get_number(void)
339 return SIMIX_process_count();
342 /** \ingroup m_process_management
343 * \brief Set the kill time of a process.
345 * \param process a process
346 * \param kill_time the time when the process is killed.
348 msg_error_t MSG_process_set_kill_time(msg_process_t process, double kill_time)
350 simcall_process_set_kill_time(process,kill_time);
354 /** \ingroup m_process_management
355 * \brief Returns the process ID of \a process.
357 * This function checks whether \a process is a valid pointer and return its PID (or 0 in case of problem).
359 int MSG_process_get_PID(msg_process_t process)
361 /* Do not raise an exception here: this function is called by the logs
362 * and the exceptions, so it would be called back again and again */
363 if (process == NULL) {
366 return simcall_process_get_PID(process);
369 /** \ingroup m_process_management
370 * \brief Returns the process ID of the parent of \a process.
372 * This function checks whether \a process is a valid pointer and return its PID.
373 * Returns -1 if the process has not been created by any other process.
375 int MSG_process_get_PPID(msg_process_t process)
377 xbt_assert(process != NULL, "Invalid parameter: First argument must not be NULL");
378 return simcall_process_get_PPID(process);
381 /** \ingroup m_process_management
382 * \brief Return the name of a process.
384 * This function checks whether \a process is a valid pointer and return its name.
386 const char *MSG_process_get_name(msg_process_t process)
388 xbt_assert(process != NULL, "Invalid parameter: First argument must not be NULL");
389 return simcall_process_get_name(process);
392 /** \ingroup m_process_management
393 * \brief Returns the value of a given process property
395 * \param process a process
396 * \param name a property name
397 * \return value of a property (or NULL if the property is not set)
399 const char *MSG_process_get_property_value(msg_process_t process, const char *name)
401 return (char*) xbt_dict_get_or_null(MSG_process_get_properties(process), name);
404 /** \ingroup m_process_management
405 * \brief Return the list of properties
407 * This function returns all the parameters associated with a process
409 xbt_dict_t MSG_process_get_properties(msg_process_t process)
411 xbt_assert(process != NULL, "Invalid parameter: First argument must not be NULL");
412 return simcall_process_get_properties(process);
415 /** \ingroup m_process_management
416 * \brief Return the PID of the current process.
418 * This function returns the PID of the currently running #msg_process_t.
420 int MSG_process_self_PID(void)
422 return MSG_process_get_PID(MSG_process_self());
425 /** \ingroup m_process_management
426 * \brief Return the PPID of the current process.
428 * This function returns the PID of the parent of the currently running #msg_process_t.
430 int MSG_process_self_PPID(void)
432 return MSG_process_get_PPID(MSG_process_self());
435 /** \ingroup m_process_management
436 * \brief Return the current process.
438 * This function returns the currently running #msg_process_t.
440 msg_process_t MSG_process_self(void)
442 return SIMIX_process_self();
445 /** \ingroup m_process_management
446 * \brief Suspend the process.
448 * This function suspends the process by suspending the task on which it was waiting for the completion.
450 msg_error_t MSG_process_suspend(msg_process_t process)
452 xbt_assert(process != NULL, "Invalid parameter: First argument must not be NULL");
454 TRACE_msg_process_suspend(process);
455 simcall_process_suspend(process);
459 /** \ingroup m_process_management
460 * \brief Resume a suspended process.
462 * This function resumes a suspended process by resuming the task on which it was waiting for the completion.
464 msg_error_t MSG_process_resume(msg_process_t process)
466 xbt_assert(process != NULL, "Invalid parameter: First argument must not be NULL");
468 TRACE_msg_process_resume(process);
469 simcall_process_resume(process);
473 /** \ingroup m_process_management
474 * \brief Returns true if the process is suspended .
476 * This checks whether a process is suspended or not by inspecting the 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: First argument must not be NULL");
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_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 its host comes back up.
501 XBT_PUBLIC(void) MSG_process_auto_restart_set(msg_process_t process, int auto_restart) {
502 simcall_process_auto_restart_set(process,auto_restart);
505 * \ingroup m_process_management
506 * \brief Restarts a process from the beginning.
508 XBT_PUBLIC(msg_process_t) MSG_process_restart(msg_process_t process) {
509 return simcall_process_restart(process);