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. */
7 #include "msg_private.h"
8 #include "xbt/sysdep.h"
10 #include "src/simix/smx_process_private.h"
11 #include "src/simix/smx_private.h"
13 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_process, msg,
14 "Logging specific to MSG (process)");
16 /** @addtogroup m_process_management
17 * \htmlonly <!-- DOXYGEN_NAVBAR_LABEL="Processes" --> \endhtmlonly
19 * Processes (#msg_process_t) are independent agents that can do stuff on their own. They are in charge of executing your code interacting with the simulated world.
20 * A process may be defined as a <em>code</em> with some <em>private data</em>.
21 * Processes must be located on <em>hosts</em> (#msg_host_t), and they exchange data by sending tasks (#msg_task_t) that are similar to envelops containing data.
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 = (simdata_process_t) SIMIX_process_self_get_data(smx_proc);
38 SIMIX_process_self_set_data(smx_proc, 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, 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(const char *name,
58 xbt_main_func_t code, void *data,
59 const char *hostname, double kill_time,
60 int argc, char **argv,
61 xbt_dict_t properties, int auto_restart,
62 smx_process_t parent_process)
64 msg_host_t host = MSG_host_by_name(hostname);
65 msg_process_t p = MSG_process_create_with_environment(name, code, data,
69 MSG_process_set_kill_time(p,kill_time);
70 MSG_process_auto_restart_set(p,auto_restart);
75 /** \ingroup m_process_management
76 * \brief Creates and runs a new #msg_process_t.
78 * Does exactly the same as #MSG_process_create_with_arguments but without
79 providing standard arguments (\a argc, \a argv, \a start_time, \a kill_time).
80 * \sa MSG_process_create_with_arguments
82 msg_process_t MSG_process_create(const char *name,
83 xbt_main_func_t code, void *data,
86 return MSG_process_create_with_environment(name, code, data, host, 0,
90 /** \ingroup m_process_management
91 * \brief Creates and runs a new #msg_process_t.
93 * A constructor for #msg_process_t taking four arguments and returning the
94 * corresponding object. The structure (and the corresponding thread) is
95 * created, and put in the list of ready process.
96 * \param name a name for the object. It is for user-level information
98 * \param code is a function describing the behavior of the process. It
99 should then only use functions described in \ref
100 m_process_management (to create a new #msg_process_t for example),
101 in \ref m_host_management (only the read-only functions i.e. whose
102 name contains the word get), in \ref m_task_management (to create
103 or destroy some #msg_task_t for example) and in \ref
104 msg_task_usage (to handle file transfers and task processing).
105 * \param data a pointer to any data one may want to attach to the new
106 object. It is for user-level information and can be NULL. It can
107 be retrieved with the function \ref MSG_process_get_data.
108 * \param host the location where the new process is executed.
109 * \param argc first argument passed to \a code
110 * \param argv second argument passed to \a code
112 * \return The new corresponding object.
115 msg_process_t MSG_process_create_with_arguments(const char *name,
116 xbt_main_func_t code,
117 void *data, msg_host_t host,
118 int argc, char **argv)
120 return MSG_process_create_with_environment(name, code, data, host,
124 /** \ingroup m_process_management
125 * \brief Creates and runs a new #msg_process_t.
127 * A constructor for #msg_process_t taking four arguments and returning the
128 * corresponding object. The structure (and the corresponding thread) is
129 * created, and put in the list of ready process.
130 * \param name a name for the object. It is for user-level information
132 * \param code is a function describing the behavior of the process. It
133 should then only use functions described in \ref
134 m_process_management (to create a new #msg_process_t for example),
135 in \ref m_host_management (only the read-only functions i.e. whose
136 name contains the word get), in \ref m_task_management (to create
137 or destroy some #msg_task_t for example) and in \ref
138 msg_task_usage (to handle file transfers and task processing).
139 * \param data a pointer to any data one may want to attach to the new
140 object. It is for user-level information and can be NULL. It can
141 be retrieved with the function \ref MSG_process_get_data.
142 * \param host the location where the new process is executed.
143 * \param argc first argument passed to \a code
144 * \param argv second argument passed to \a code. WARNING, these strings are freed by the SimGrid kernel when the process exits, so they cannot be static nor shared between several processes.
145 * \param properties list a properties defined for this process
147 * \return The new corresponding object.
149 msg_process_t MSG_process_create_with_environment(const char *name,
150 xbt_main_func_t code,
151 void *data, msg_host_t host,
152 int argc, char **argv,
153 xbt_dict_t properties)
155 xbt_assert(code != NULL && host != NULL, "Invalid parameters: host and code params must not be NULL");
156 simdata_process_t simdata = xbt_new0(s_simdata_process_t, 1);
157 msg_process_t process;
159 /* Simulator data for MSG */
160 simdata->waiting_action = NULL;
161 simdata->waiting_task = NULL;
162 simdata->m_host = host;
163 simdata->argc = argc;
164 simdata->argv = argv;
165 simdata->data = data;
166 simdata->last_errno = MSG_OK;
168 /* Let's create the process: SIMIX may decide to start it right now,
169 * even before returning the flow control to us */
170 process = simcall_process_create(name, code, simdata, sg_host_get_name(host), -1,
171 argc, argv, properties,0);
174 /* Undo everything we have just changed */
179 simcall_process_on_exit(process,(int_f_pvoid_pvoid_t)TRACE_msg_process_kill,process);
184 /** \ingroup m_process_management
185 * \param process poor victim
187 * This function simply kills a \a process... scary isn't it ? :)
189 void MSG_process_kill(msg_process_t process)
191 // /* FIXME: why do we only cancel communication actions? is this useful? */
192 // simdata_process_t p_simdata = simcall_process_get_data(process);
193 // if (p_simdata->waiting_task && p_simdata->waiting_task->simdata->comm) {
194 // simcall_comm_cancel(p_simdata->waiting_task->simdata->comm);
197 simcall_process_kill(process);
203 * \brief Wait for the completion of a #msg_process_t.
205 * \param process the process to wait for
206 * \param timeout wait until the process is over, or the timeout occurs
208 msg_error_t MSG_process_join(msg_process_t process, double timeout){
209 simcall_process_join(process, timeout);
213 /** \ingroup m_process_management
214 * \brief Migrates a process to another location.
216 * This function checks whether \a process and \a host are valid pointers
217 and change the value of the #msg_host_t on which \a process is running.
219 msg_error_t MSG_process_migrate(msg_process_t process, msg_host_t host)
221 simdata_process_t simdata = (simdata_process_t) simcall_process_get_data(process);
222 simdata->m_host = host;
223 msg_host_t now = simdata->m_host;
224 TRACE_msg_process_change_host(process, now, host);
225 simcall_process_set_host(process, host);
229 /** \ingroup m_process_management
230 * \brief Returns the user data of a process.
232 * This function checks whether \a process is a valid pointer or not
233 and returns the user data associated to this process.
235 void* MSG_process_get_data(msg_process_t process)
237 xbt_assert(process != NULL, "Invalid parameter: first parameter must not be NULL!");
239 /* get from SIMIX the MSG process data, and then the user data */
240 simdata_process_t simdata = (simdata_process_t) simcall_process_get_data(process);
242 return simdata->data;
247 /** \ingroup m_process_management
248 * \brief Sets the user data of a process.
250 * This function checks whether \a process is a valid pointer or not
251 and sets the user data associated to this process.
253 msg_error_t MSG_process_set_data(msg_process_t process, void *data)
255 xbt_assert(process != NULL, "Invalid parameter: first parameter must not be NULL!");
257 simdata_process_t simdata =
258 (simdata_process_t) simcall_process_get_data(process);
259 simdata->data = data;
264 /** \ingroup m_process_management
265 * \brief Sets a cleanup function to be called to free the userdata of a
266 * process when a process is destroyed.
267 * \param data_cleanup a cleanup function for the userdata of a process,
268 * or NULL to call no function
270 XBT_PUBLIC(void) MSG_process_set_data_cleanup(void_f_pvoid_t data_cleanup) {
272 msg_global->process_data_cleanup = data_cleanup;
275 /** \ingroup m_process_management
276 * \brief Return the location on which a process is running.
277 * \param process a process (NULL means the current one)
278 * \return the msg_host_t corresponding to the location on which \a
279 * process is running.
281 msg_host_t MSG_process_get_host(msg_process_t process)
283 simdata_process_t simdata;
284 if (process == NULL) {
285 simdata = (simdata_process_t) SIMIX_process_self_get_data(SIMIX_process_self());
288 simdata = (simdata_process_t) simcall_process_get_data(process);
290 return simdata ? simdata->m_host : NULL;
293 /** \ingroup m_process_management
295 * \brief Return a #msg_process_t given its PID.
297 * This function search in the list of all the created msg_process_t for a msg_process_t
298 whose PID is equal to \a PID. If no host is found, \c NULL is returned.
299 Note that the PID are uniq in the whole simulation, not only on a given host.
301 msg_process_t MSG_process_from_PID(int PID)
303 return SIMIX_process_from_PID(PID);
306 /** @brief returns a list of all currently existing processes */
307 xbt_dynar_t MSG_processes_as_dynar(void) {
308 return SIMIX_processes_as_dynar();
310 /** @brief Return the current number MSG processes.
312 int MSG_process_get_number(void)
314 return SIMIX_process_count();
317 /** \ingroup m_process_management
318 * \brief Set the kill time of a process.
320 * \param process a process
321 * \param kill_time the time when the process is killed.
323 msg_error_t MSG_process_set_kill_time(msg_process_t process, double kill_time)
325 simcall_process_set_kill_time(process,kill_time);
329 /** \ingroup m_process_management
330 * \brief Returns the process ID of \a process.
332 * This function checks whether \a process is a valid pointer or not
333 and return its PID (or 0 in case of problem).
335 int MSG_process_get_PID(msg_process_t process)
337 /* Do not raise an exception here: this function is called by the logs
338 * and the exceptions, so it would be called back again and again */
339 if (process == NULL) {
342 return simcall_process_get_PID(process);
345 /** \ingroup m_process_management
346 * \brief Returns the process ID of the parent of \a process.
348 * This function checks whether \a process is a valid pointer or not
349 and return its PID. Returns -1 if the process has not been created by
352 int MSG_process_get_PPID(msg_process_t process)
354 xbt_assert(process != NULL, "Invalid parameter: First argument must not be NULL");
356 return simcall_process_get_PPID(process);
359 /** \ingroup m_process_management
360 * \brief Return the name of a process.
362 * This function checks whether \a process is a valid pointer or not
365 const char *MSG_process_get_name(msg_process_t process)
367 xbt_assert(process != NULL, "Invalid parameter: First argument must not be NULL");
369 return simcall_process_get_name(process);
372 /** \ingroup m_process_management
373 * \brief Returns the value of a given process property
375 * \param process a process
376 * \param name a property name
377 * \return value of a property (or NULL if the property is not set)
379 const char *MSG_process_get_property_value(msg_process_t process,
382 return (char*) xbt_dict_get_or_null(MSG_process_get_properties(process), name);
385 /** \ingroup m_process_management
386 * \brief Return the list of properties
388 * This function returns all the parameters associated with a process
390 xbt_dict_t MSG_process_get_properties(msg_process_t process)
392 xbt_assert(process != NULL, "Invalid parameter: First argument must not be NULL");
394 return simcall_process_get_properties(process);
398 /** \ingroup m_process_management
399 * \brief Return the PID of the current process.
401 * This function returns the PID of the currently running #msg_process_t.
403 int MSG_process_self_PID(void)
405 return MSG_process_get_PID(MSG_process_self());
408 /** \ingroup m_process_management
409 * \brief Return the PPID of the current process.
411 * This function returns the PID of the parent of the currently
412 * running #msg_process_t.
414 int MSG_process_self_PPID(void)
416 return MSG_process_get_PPID(MSG_process_self());
419 /** \ingroup m_process_management
420 * \brief Return the current process.
422 * This function returns the currently running #msg_process_t.
424 msg_process_t MSG_process_self(void)
426 return SIMIX_process_self();
429 /** \ingroup m_process_management
430 * \brief Suspend the process.
432 * This function suspends the process by suspending the task on which
433 * it was waiting for the completion.
435 msg_error_t MSG_process_suspend(msg_process_t process)
437 xbt_assert(process != NULL, "Invalid parameter: First argument must not be NULL");
439 TRACE_msg_process_suspend(process);
440 simcall_process_suspend(process);
444 /** \ingroup m_process_management
445 * \brief Resume a suspended process.
447 * This function resumes a suspended process by resuming the task on
448 * which it was waiting for the completion.
450 msg_error_t MSG_process_resume(msg_process_t process)
452 xbt_assert(process != NULL, "Invalid parameter: First argument must not be NULL");
454 TRACE_msg_process_resume(process);
455 simcall_process_resume(process);
459 /** \ingroup m_process_management
460 * \brief Returns true if the process is suspended .
462 * This checks whether a process is suspended or not by inspecting the
463 * task on which it was waiting for the completion.
465 int MSG_process_is_suspended(msg_process_t process)
467 xbt_assert(process != NULL, "Invalid parameter: First argument must not be NULL");
468 return simcall_process_is_suspended(process);
471 smx_context_t MSG_process_get_smx_ctx(msg_process_t process) {
472 return SIMIX_process_get_context(process);
475 * \ingroup m_process_management
476 * \brief Add a function to the list of "on_exit" functions for the current process.
477 * The on_exit functions are the functions executed when your process is killed.
478 * You should use them to free the data used by your process.
480 void MSG_process_on_exit(int_f_pvoid_pvoid_t fun, void *data) {
481 simcall_process_on_exit(MSG_process_self(),fun,data);
484 * \ingroup m_process_management
485 * \brief Sets the "auto-restart" flag of the process.
486 * If the flag is set to 1, the process will be automatically restarted when
487 * its host comes back up.
489 XBT_PUBLIC(void) MSG_process_auto_restart_set(msg_process_t process, int auto_restart) {
490 simcall_process_auto_restart_set(process,auto_restart);
493 * \ingroup m_process_management
494 * \brief Restarts a process from the beginning.
496 XBT_PUBLIC(msg_process_t) MSG_process_restart(msg_process_t process) {
497 return simcall_process_restart(process);