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 "simgrid/s4u/host.hpp"
9 #include "src/simix/ActorImpl.hpp"
11 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_process, msg, "Logging specific to MSG (process)");
13 /** @addtogroup m_process_management
15 * Processes (#msg_process_t) are independent agents that can do stuff on their own. They are in charge of executing
16 * your code interacting with the simulated world.
17 * A process may be defined as a <em>code</em> with some <em>private data</em>.
18 * Processes must be located on <em>hosts</em> (#msg_host_t), and they exchange data by sending tasks (#msg_task_t)
19 * that are similar to envelops containing data.
22 /******************************** Process ************************************/
24 * \brief Cleans the MSG data of a process.
25 * \param smx_proc a SIMIX process
27 void MSG_process_cleanup_from_SIMIX(smx_actor_t smx_actor)
29 simgrid::MsgActorExt* msg_actor;
31 // get the MSG process from the SIMIX process
32 if (smx_actor == SIMIX_process_self()) {
33 /* avoid a SIMIX request if this function is called by the process itself */
34 msg_actor = (simgrid::MsgActorExt*)SIMIX_process_self_get_data();
35 SIMIX_process_self_set_data(nullptr);
37 msg_actor = (simgrid::MsgActorExt*)smx_actor->data;
38 simcall_process_set_data(smx_actor, nullptr);
41 TRACE_msg_process_destroy(smx_actor->name.c_str(), smx_actor->pid);
42 // free the data if a function was provided
43 if (msg_actor && msg_actor->data && msg_global->process_data_cleanup) {
44 msg_global->process_data_cleanup(msg_actor->data);
48 SIMIX_process_cleanup(smx_actor);
51 /* This function creates a MSG process. It has the prototype enforced by SIMIX_function_register_process_create */
52 smx_actor_t MSG_process_create_from_SIMIX(const char* name, std::function<void()> code, void* data, sg_host_t host,
53 xbt_dict_t properties, smx_actor_t parent_process)
55 msg_process_t p = MSG_process_create_from_stdfunc(name, std::move(code), data, host, properties);
59 /** \ingroup m_process_management
60 * \brief Creates and runs a new #msg_process_t.
62 * Does exactly the same as #MSG_process_create_with_arguments but without providing standard arguments
63 * (\a argc, \a argv, \a start_time, \a kill_time).
64 * \sa MSG_process_create_with_arguments
66 msg_process_t MSG_process_create(const char *name, xbt_main_func_t code, void *data, msg_host_t host)
68 return MSG_process_create_with_environment(name, code, data, host, 0, nullptr, nullptr);
71 /** \ingroup m_process_management
72 * \brief Creates and runs a new #msg_process_t.
74 * A constructor for #msg_process_t taking four arguments and returning the corresponding object. The structure (and
75 * the corresponding thread) is created, and put in the list of ready process.
76 * \param name a name for the object. It is for user-level information and can be nullptr.
77 * \param code is a function describing the behavior of the process. It should then only use functions described
78 * in \ref m_process_management (to create a new #msg_process_t for example),
79 in \ref m_host_management (only the read-only functions i.e. whose name contains the word get),
80 in \ref m_task_management (to create or destroy some #msg_task_t for example) and
81 in \ref msg_task_usage (to handle file transfers and task processing).
82 * \param data a pointer to any data one may want to attach to the new object. It is for user-level information and
83 * can be nullptr. It can be retrieved with the function \ref MSG_process_get_data.
84 * \param host the location where the new process is executed.
85 * \param argc first argument passed to \a code
86 * \param argv second argument passed to \a code
88 * \return The new corresponding object.
91 msg_process_t MSG_process_create_with_arguments(const char *name, xbt_main_func_t code, void *data, msg_host_t host,
92 int argc, char **argv)
94 return MSG_process_create_with_environment(name, code, data, host, argc, argv, nullptr);
97 /** \ingroup m_process_management
98 * \brief Creates and runs a new #msg_process_t.
100 * A constructor for #msg_process_t taking four arguments and returning the corresponding object. The structure (and
101 * the corresponding thread) is created, and put in the list of ready process.
102 * \param name a name for the object. It is for user-level information and can be nullptr.
103 * \param code is a function describing the behavior of the process. It should then only use functions described
104 * in \ref m_process_management (to create a new #msg_process_t for example),
105 in \ref m_host_management (only the read-only functions i.e. whose name contains the word get),
106 in \ref m_task_management (to create or destroy some #msg_task_t for example) and
107 in \ref msg_task_usage (to handle file transfers and task processing).
108 * \param data a pointer to any data one may want to attach to the new object. It is for user-level information and
109 * can be nullptr. It can be retrieved with the function \ref MSG_process_get_data.
110 * \param host the location where the new process is executed.
111 * \param argc first argument passed to \a code
112 * \param argv second argument passed to \a code. WARNING, these strings are freed by the SimGrid kernel when the
113 * process exits, so they cannot be static nor shared between several processes.
114 * \param properties list a properties defined for this process
116 * \return The new corresponding object.
118 msg_process_t MSG_process_create_with_environment(const char *name, xbt_main_func_t code, void *data, msg_host_t host,
119 int argc, char **argv, xbt_dict_t properties)
121 std::function<void()> function;
123 function = simgrid::xbt::wrapMain(code, argc, const_cast<const char*const*>(argv));
124 msg_process_t res = MSG_process_create_from_stdfunc(name, std::move(function), data, host, properties);
125 for (int i = 0; i != argc; ++i)
131 msg_process_t MSG_process_create_from_stdfunc(const char* name, std::function<void()> code, void* data, msg_host_t host,
132 xbt_dict_t properties)
134 xbt_assert(code != nullptr && host != nullptr, "Invalid parameters: host and code params must not be nullptr");
135 simgrid::MsgActorExt* msgExt = new simgrid::MsgActorExt(data);
137 msg_process_t process = simcall_process_create(name, std::move(code), msgExt, host, properties);
139 if (!process) { /* Undo everything */
144 simcall_process_on_exit(process, (int_f_pvoid_pvoid_t)TRACE_msg_process_kill, process);
148 /* Become a process in the simulation
150 * Currently this can only be called by the main thread (once) and only work with some thread factories
151 * (currently ThreadContextFactory).
153 * In the future, it might be extended in order to attach other threads created by a third party library.
155 msg_process_t MSG_process_attach(const char *name, void *data, msg_host_t host, xbt_dict_t properties)
157 xbt_assert(host != nullptr, "Invalid parameters: host and code params must not be nullptr");
159 /* Let's create the process: SIMIX may decide to start it right now, even before returning the flow control to us */
160 msg_process_t process =
161 SIMIX_process_attach(name, new simgrid::MsgActorExt(data), host->cname(), properties, nullptr);
163 xbt_die("Could not attach");
164 simcall_process_on_exit(process,(int_f_pvoid_pvoid_t)TRACE_msg_process_kill,process);
168 /** Detach a process attached with `MSG_process_attach()`
170 * This is called when the current process has finished its job.
171 * Used in the main thread, it waits for the simulation to finish before returning. When it returns, the other
172 * simulated processes and the maestro are destroyed.
174 void MSG_process_detach()
176 SIMIX_process_detach();
179 /** \ingroup m_process_management
180 * \param process poor victim
182 * This function simply kills a \a process... scary isn't it ? :)
184 void MSG_process_kill(msg_process_t process)
186 simcall_process_kill(process);
190 * \brief Wait for the completion of a #msg_process_t.
192 * \param process the process to wait for
193 * \param timeout wait until the process is over, or the timeout occurs
195 msg_error_t MSG_process_join(msg_process_t process, double timeout){
196 simcall_process_join(process, timeout);
200 /** \ingroup m_process_management
201 * \brief Migrates a process to another location.
203 * This function checks whether \a process and \a host are valid pointers and change the value of the #msg_host_t on
204 * which \a process is running.
206 msg_error_t MSG_process_migrate(msg_process_t process, msg_host_t host)
208 TRACE_msg_process_change_host(process, MSG_process_get_host(process), host);
209 simcall_process_set_host(process, host);
213 /** Yield the current actor; let the other actors execute first */
214 void MSG_process_yield()
216 simgrid::simix::kernelImmediate([] { /* do nothing*/ });
219 /** \ingroup m_process_management
220 * \brief Returns the user data of a process.
222 * This function checks whether \a process is a valid pointer and returns the user data associated to this process.
224 void* MSG_process_get_data(msg_process_t process)
226 xbt_assert(process != nullptr, "Invalid parameter: first parameter must not be nullptr!");
228 /* get from SIMIX the MSG process data, and then the user data */
229 simgrid::MsgActorExt* msgExt = (simgrid::MsgActorExt*)process->data;
236 /** \ingroup m_process_management
237 * \brief Sets the user data of a process.
239 * This function checks whether \a process is a valid pointer and sets the user data associated to this process.
241 msg_error_t MSG_process_set_data(msg_process_t process, void *data)
243 xbt_assert(process != nullptr, "Invalid parameter: first parameter must not be nullptr!");
245 static_cast<simgrid::MsgActorExt*>(process->data)->data = data;
250 /** \ingroup m_process_management
251 * \brief Sets a cleanup function to be called to free the userdata of a process when a process is destroyed.
252 * \param data_cleanup a cleanup function for the userdata of a process, or nullptr to call no function
254 XBT_PUBLIC(void) MSG_process_set_data_cleanup(void_f_pvoid_t data_cleanup) {
255 msg_global->process_data_cleanup = data_cleanup;
258 /** \ingroup m_process_management
259 * \brief Return the location on which a process is running.
260 * \param process a process (nullptr means the current one)
261 * \return the msg_host_t corresponding to the location on which \a process is running.
263 msg_host_t MSG_process_get_host(msg_process_t process)
265 if (process == nullptr) {
266 return MSG_process_self()->host;
268 return process->host;
272 /** \ingroup m_process_management
274 * \brief Return a #msg_process_t given its PID.
276 * 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.
277 * If no host is found, \c nullptr is returned.
278 Note that the PID are uniq in the whole simulation, not only on a given host.
280 msg_process_t MSG_process_from_PID(int PID)
282 return SIMIX_process_from_PID(PID);
285 /** @brief returns a list of all currently existing processes */
286 xbt_dynar_t MSG_processes_as_dynar() {
287 return SIMIX_processes_as_dynar();
290 /** @brief Return the current number MSG processes. */
291 int MSG_process_get_number()
293 return SIMIX_process_count();
296 /** \ingroup m_process_management
297 * \brief Set the kill time of a process.
299 * \param process a process
300 * \param kill_time the time when the process is killed.
302 msg_error_t MSG_process_set_kill_time(msg_process_t process, double kill_time)
304 simcall_process_set_kill_time(process,kill_time);
308 /** \ingroup m_process_management
309 * \brief Returns the process ID of \a process.
311 * This function checks whether \a process is a valid pointer and return its PID (or 0 in case of problem).
313 int MSG_process_get_PID(msg_process_t process)
315 /* Do not raise an exception here: this function is called by the logs
316 * and the exceptions, so it would be called back again and again */
317 if (process == nullptr)
322 /** \ingroup m_process_management
323 * \brief Returns the process ID of the parent of \a process.
325 * This function checks whether \a process is a valid pointer and return its PID.
326 * Returns -1 if the process has not been created by any other process.
328 int MSG_process_get_PPID(msg_process_t process)
330 return process->ppid;
333 /** \ingroup m_process_management
334 * \brief Return the name of a process.
336 * This function checks whether \a process is a valid pointer and return its name.
338 const char *MSG_process_get_name(msg_process_t process)
340 return process->name.c_str();
343 /** \ingroup m_process_management
344 * \brief Returns the value of a given process property
346 * \param process a process
347 * \param name a property name
348 * \return value of a property (or nullptr if the property is not set)
350 const char *MSG_process_get_property_value(msg_process_t process, const char *name)
352 return (char*) xbt_dict_get_or_null(MSG_process_get_properties(process), name);
355 /** \ingroup m_process_management
356 * \brief Return the list of properties
358 * This function returns all the parameters associated with a process
360 xbt_dict_t MSG_process_get_properties(msg_process_t process)
362 xbt_assert(process != nullptr, "Invalid parameter: First argument must not be nullptr");
363 return simcall_process_get_properties(process);
366 /** \ingroup m_process_management
367 * \brief Return the PID of the current process.
369 * This function returns the PID of the currently running #msg_process_t.
371 int MSG_process_self_PID()
373 return MSG_process_get_PID(MSG_process_self());
376 /** \ingroup m_process_management
377 * \brief Return the PPID of the current process.
379 * This function returns the PID of the parent of the currently running #msg_process_t.
381 int MSG_process_self_PPID()
383 return MSG_process_get_PPID(MSG_process_self());
386 /** \ingroup m_process_management
387 * \brief Return the current process.
389 * This function returns the currently running #msg_process_t.
391 msg_process_t MSG_process_self()
393 return SIMIX_process_self();
396 /** \ingroup m_process_management
397 * \brief Suspend the process.
399 * This function suspends the process by suspending the task on which it was waiting for the completion.
401 msg_error_t MSG_process_suspend(msg_process_t process)
403 xbt_assert(process != nullptr, "Invalid parameter: First argument must not be nullptr");
405 TRACE_msg_process_suspend(process);
406 simcall_process_suspend(process);
410 /** \ingroup m_process_management
411 * \brief Resume a suspended process.
413 * This function resumes a suspended process by resuming the task on which it was waiting for the completion.
415 msg_error_t MSG_process_resume(msg_process_t process)
417 xbt_assert(process != nullptr, "Invalid parameter: First argument must not be nullptr");
419 TRACE_msg_process_resume(process);
420 simcall_process_resume(process);
424 /** \ingroup m_process_management
425 * \brief Returns true if the process is suspended .
427 * This checks whether a process is suspended or not by inspecting the task on which it was waiting for the completion.
429 int MSG_process_is_suspended(msg_process_t process)
431 xbt_assert(process != nullptr, "Invalid parameter: First argument must not be nullptr");
432 return simcall_process_is_suspended(process);
435 smx_context_t MSG_process_get_smx_ctx(msg_process_t process) {
436 return SIMIX_process_get_context(process);
439 * \ingroup m_process_management
440 * \brief Add a function to the list of "on_exit" functions for the current process.
441 * The on_exit functions are the functions executed when your process is killed.
442 * You should use them to free the data used by your process.
444 void MSG_process_on_exit(int_f_pvoid_pvoid_t fun, void *data) {
445 simcall_process_on_exit(MSG_process_self(),fun,data);
448 * \ingroup m_process_management
449 * \brief Sets the "auto-restart" flag of the process.
450 * If the flag is set to 1, the process will be automatically restarted when its host comes back up.
452 XBT_PUBLIC(void) MSG_process_auto_restart_set(msg_process_t process, int auto_restart) {
453 simcall_process_auto_restart_set(process,auto_restart);
456 * \ingroup m_process_management
457 * \brief Restarts a process from the beginning.
459 XBT_PUBLIC(msg_process_t) MSG_process_restart(msg_process_t process) {
460 return simcall_process_restart(process);