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_proc)
29 simdata_process_t msg_proc;
31 // get the MSG process from the SIMIX process
32 if (smx_proc == SIMIX_process_self()) {
33 /* avoid a SIMIX request if this function is called by the process itself */
34 msg_proc = (simdata_process_t) SIMIX_process_self_get_data();
35 SIMIX_process_self_set_data(nullptr);
37 msg_proc = (simdata_process_t) simcall_process_get_data(smx_proc);
38 simcall_process_set_data(smx_proc, nullptr);
41 TRACE_msg_process_destroy(smx_proc->name.c_str(), smx_proc->pid);
42 // free the data if a function was provided
43 if (msg_proc && msg_proc->data && msg_global->process_data_cleanup) {
44 msg_global->process_data_cleanup(msg_proc->data);
47 // free the MSG process
49 SIMIX_process_cleanup(smx_proc);
52 /* This function creates a MSG process. It has the prototype enforced by SIMIX_function_register_process_create */
53 smx_actor_t MSG_process_create_from_SIMIX(
54 const char *name, std::function<void()> code, void *data, sg_host_t host,
55 double kill_time, xbt_dict_t properties,
56 int auto_restart, smx_actor_t parent_process)
58 msg_process_t p = MSG_process_create_with_environment(name, std::move(code), data, host, properties);
60 MSG_process_set_kill_time(p,kill_time);
61 MSG_process_auto_restart_set(p,auto_restart);
66 /** \ingroup m_process_management
67 * \brief Creates and runs a new #msg_process_t.
69 * Does exactly the same as #MSG_process_create_with_arguments but without providing standard arguments
70 * (\a argc, \a argv, \a start_time, \a kill_time).
71 * \sa MSG_process_create_with_arguments
73 msg_process_t MSG_process_create(const char *name, xbt_main_func_t code, void *data, msg_host_t host)
75 return MSG_process_create_with_environment(name, code, data, host, 0, nullptr, nullptr);
78 /** \ingroup m_process_management
79 * \brief Creates and runs a new #msg_process_t.
81 * A constructor for #msg_process_t taking four arguments and returning the corresponding object. The structure (and
82 * the corresponding thread) is created, and put in the list of ready process.
83 * \param name a name for the object. It is for user-level information and can be nullptr.
84 * \param code is a function describing the behavior of the process. It should then only use functions described
85 * in \ref m_process_management (to create a new #msg_process_t for example),
86 in \ref m_host_management (only the read-only functions i.e. whose name contains the word get),
87 in \ref m_task_management (to create or destroy some #msg_task_t for example) and
88 in \ref msg_task_usage (to handle file transfers and task processing).
89 * \param data a pointer to any data one may want to attach to the new object. It is for user-level information and
90 * can be nullptr. It can be retrieved with the function \ref MSG_process_get_data.
91 * \param host the location where the new process is executed.
92 * \param argc first argument passed to \a code
93 * \param argv second argument passed to \a code
95 * \return The new corresponding object.
98 msg_process_t MSG_process_create_with_arguments(const char *name, xbt_main_func_t code, void *data, msg_host_t host,
99 int argc, char **argv)
101 return MSG_process_create_with_environment(name, code, data, host, argc, argv, nullptr);
104 /** \ingroup m_process_management
105 * \brief Creates and runs a new #msg_process_t.
107 * A constructor for #msg_process_t taking four arguments and returning the corresponding object. The structure (and
108 * the corresponding thread) is created, and put in the list of ready process.
109 * \param name a name for the object. It is for user-level information and can be nullptr.
110 * \param code is a function describing the behavior of the process. It should then only use functions described
111 * in \ref m_process_management (to create a new #msg_process_t for example),
112 in \ref m_host_management (only the read-only functions i.e. whose name contains the word get),
113 in \ref m_task_management (to create or destroy some #msg_task_t for example) and
114 in \ref msg_task_usage (to handle file transfers and task processing).
115 * \param data a pointer to any data one may want to attach to the new object. It is for user-level information and
116 * can be nullptr. It can be retrieved with the function \ref MSG_process_get_data.
117 * \param host the location where the new process is executed.
118 * \param argc first argument passed to \a code
119 * \param argv second argument passed to \a code. WARNING, these strings are freed by the SimGrid kernel when the
120 * process exits, so they cannot be static nor shared between several processes.
121 * \param properties list a properties defined for this process
123 * \return The new corresponding object.
125 msg_process_t MSG_process_create_with_environment(const char *name, xbt_main_func_t code, void *data, msg_host_t host,
126 int argc, char **argv, xbt_dict_t properties)
128 std::function<void()> function;
130 function = simgrid::xbt::wrapMain(code, argc, const_cast<const char*const*>(argv));
131 msg_process_t res = MSG_process_create_with_environment(name,
132 std::move(function), data, host, properties);
133 for (int i = 0; i != argc; ++i)
139 msg_process_t MSG_process_create_with_environment(
140 const char *name, std::function<void()> code, void *data,
141 msg_host_t host, xbt_dict_t properties)
143 xbt_assert(code != nullptr && host != nullptr, "Invalid parameters: host and code params must not be nullptr");
144 simdata_process_t simdata = xbt_new0(s_simdata_process_t, 1);
145 msg_process_t process;
147 /* Simulator data for MSG */
148 simdata->waiting_action = nullptr;
149 simdata->waiting_task = nullptr;
150 simdata->m_host = host;
151 simdata->data = data;
152 simdata->last_errno = MSG_OK;
154 /* Let's create the process: SIMIX may decide to start it right now,
155 * even before returning the flow control to us */
156 process = simcall_process_create(
157 name, std::move(code), simdata, host, -1, properties, 0);
160 /* Undo everything we have just changed */
165 simcall_process_on_exit(process,(int_f_pvoid_pvoid_t)TRACE_msg_process_kill,process);
170 static int MSG_maestro(int argc, char** argv)
172 int res = MSG_main();
176 /* Become a process in the simulation
178 * Currently this can only be called by the main thread (once) and only work with some thread factories
179 * (currently ThreadContextFactory).
181 * In the future, it might be extended in order to attach other threads created by a third party library.
183 msg_process_t MSG_process_attach(const char *name, void *data, msg_host_t host, xbt_dict_t properties)
185 xbt_assert(host != nullptr, "Invalid parameters: host and code params must not be nullptr");
186 simdata_process_t simdata = xbt_new0(s_simdata_process_t, 1);
187 msg_process_t process;
189 /* Simulator data for MSG */
190 simdata->waiting_action = nullptr;
191 simdata->waiting_task = nullptr;
192 simdata->m_host = host;
193 simdata->data = data;
194 simdata->last_errno = MSG_OK;
196 /* Let's create the process: SIMIX may decide to start it right now, even before returning the flow control to us */
197 process = SIMIX_process_attach(name, simdata, host->cname(), properties, nullptr);
199 xbt_die("Could not attach");
200 simcall_process_on_exit(process,(int_f_pvoid_pvoid_t)TRACE_msg_process_kill,process);
204 /** Detach a process attached with `MSG_process_attach()`
206 * This is called when the current process has finished its job.
207 * Used in the main thread, it waits for the simulation to finish before returning. When it returns, the other
208 * simulated processes and the maestro are destroyed.
210 void MSG_process_detach()
212 SIMIX_process_detach();
215 /** \ingroup m_process_management
216 * \param process poor victim
218 * This function simply kills a \a process... scary isn't it ? :)
220 void MSG_process_kill(msg_process_t process)
222 simcall_process_kill(process);
226 * \brief Wait for the completion of a #msg_process_t.
228 * \param process the process to wait for
229 * \param timeout wait until the process is over, or the timeout occurs
231 msg_error_t MSG_process_join(msg_process_t process, double timeout){
232 simcall_process_join(process, timeout);
236 /** \ingroup m_process_management
237 * \brief Migrates a process to another location.
239 * This function checks whether \a process and \a host are valid pointers and change the value of the #msg_host_t on
240 * which \a process is running.
242 msg_error_t MSG_process_migrate(msg_process_t process, msg_host_t host)
244 simdata_process_t simdata = (simdata_process_t) simcall_process_get_data(process);
245 simdata->m_host = host;
246 msg_host_t now = simdata->m_host;
247 TRACE_msg_process_change_host(process, now, host);
248 simcall_process_set_host(process, host);
252 /** Yield the current actor; let the other actors execute first */
253 void MSG_process_yield()
255 simgrid::simix::kernelImmediate([] { /* do nothing*/ });
258 /** \ingroup m_process_management
259 * \brief Returns the user data of a process.
261 * This function checks whether \a process is a valid pointer and returns the user data associated to this process.
263 void* MSG_process_get_data(msg_process_t process)
265 xbt_assert(process != nullptr, "Invalid parameter: first parameter must not be nullptr!");
267 /* get from SIMIX the MSG process data, and then the user data */
268 simdata_process_t simdata = (simdata_process_t) simcall_process_get_data(process);
270 return simdata->data;
275 /** \ingroup m_process_management
276 * \brief Sets the user data of a process.
278 * This function checks whether \a process is a valid pointer and sets the user data associated to this process.
280 msg_error_t MSG_process_set_data(msg_process_t process, void *data)
282 xbt_assert(process != nullptr, "Invalid parameter: first parameter must not be nullptr!");
284 simdata_process_t simdata = (simdata_process_t) simcall_process_get_data(process);
285 simdata->data = data;
290 /** \ingroup m_process_management
291 * \brief Sets a cleanup function to be called to free the userdata of a process when a process is destroyed.
292 * \param data_cleanup a cleanup function for the userdata of a process, or nullptr to call no function
294 XBT_PUBLIC(void) MSG_process_set_data_cleanup(void_f_pvoid_t data_cleanup) {
295 msg_global->process_data_cleanup = data_cleanup;
298 /** \ingroup m_process_management
299 * \brief Return the location on which a process is running.
300 * \param process a process (nullptr means the current one)
301 * \return the msg_host_t corresponding to the location on which \a process is running.
303 msg_host_t MSG_process_get_host(msg_process_t process)
305 simdata_process_t simdata;
306 if (process == nullptr) {
307 simdata = (simdata_process_t) SIMIX_process_self_get_data();
310 simdata = (simdata_process_t) simcall_process_get_data(process);
312 return simdata ? simdata->m_host : nullptr;
315 /** \ingroup m_process_management
317 * \brief Return a #msg_process_t given its PID.
319 * 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.
320 * If no host is found, \c nullptr is returned.
321 Note that the PID are uniq in the whole simulation, not only on a given host.
323 msg_process_t MSG_process_from_PID(int PID)
325 return SIMIX_process_from_PID(PID);
328 /** @brief returns a list of all currently existing processes */
329 xbt_dynar_t MSG_processes_as_dynar() {
330 return SIMIX_processes_as_dynar();
333 /** @brief Return the current number MSG processes. */
334 int MSG_process_get_number()
336 return SIMIX_process_count();
339 /** \ingroup m_process_management
340 * \brief Set the kill time of a process.
342 * \param process a process
343 * \param kill_time the time when the process is killed.
345 msg_error_t MSG_process_set_kill_time(msg_process_t process, double kill_time)
347 simcall_process_set_kill_time(process,kill_time);
351 /** \ingroup m_process_management
352 * \brief Returns the process ID of \a process.
354 * This function checks whether \a process is a valid pointer and return its PID (or 0 in case of problem).
356 int MSG_process_get_PID(msg_process_t process)
358 /* Do not raise an exception here: this function is called by the logs
359 * and the exceptions, so it would be called back again and again */
360 if (process == nullptr)
365 /** \ingroup m_process_management
366 * \brief Returns the process ID of the parent of \a process.
368 * This function checks whether \a process is a valid pointer and return its PID.
369 * Returns -1 if the process has not been created by any other process.
371 int MSG_process_get_PPID(msg_process_t process)
373 return process->ppid;
376 /** \ingroup m_process_management
377 * \brief Return the name of a process.
379 * This function checks whether \a process is a valid pointer and return its name.
381 const char *MSG_process_get_name(msg_process_t process)
383 return process->name.c_str();
386 /** \ingroup m_process_management
387 * \brief Returns the value of a given process property
389 * \param process a process
390 * \param name a property name
391 * \return value of a property (or nullptr if the property is not set)
393 const char *MSG_process_get_property_value(msg_process_t process, const char *name)
395 return (char*) xbt_dict_get_or_null(MSG_process_get_properties(process), name);
398 /** \ingroup m_process_management
399 * \brief Return the list of properties
401 * This function returns all the parameters associated with a process
403 xbt_dict_t MSG_process_get_properties(msg_process_t process)
405 xbt_assert(process != nullptr, "Invalid parameter: First argument must not be nullptr");
406 return simcall_process_get_properties(process);
409 /** \ingroup m_process_management
410 * \brief Return the PID of the current process.
412 * This function returns the PID of the currently running #msg_process_t.
414 int MSG_process_self_PID()
416 return MSG_process_get_PID(MSG_process_self());
419 /** \ingroup m_process_management
420 * \brief Return the PPID of the current process.
422 * This function returns the PID of the parent of the currently running #msg_process_t.
424 int MSG_process_self_PPID()
426 return MSG_process_get_PPID(MSG_process_self());
429 /** \ingroup m_process_management
430 * \brief Return the current process.
432 * This function returns the currently running #msg_process_t.
434 msg_process_t MSG_process_self()
436 return SIMIX_process_self();
439 /** \ingroup m_process_management
440 * \brief Suspend the process.
442 * This function suspends the process by suspending the task on which it was waiting for the completion.
444 msg_error_t MSG_process_suspend(msg_process_t process)
446 xbt_assert(process != nullptr, "Invalid parameter: First argument must not be nullptr");
448 TRACE_msg_process_suspend(process);
449 simcall_process_suspend(process);
453 /** \ingroup m_process_management
454 * \brief Resume a suspended process.
456 * This function resumes a suspended process by resuming the task on which it was waiting for the completion.
458 msg_error_t MSG_process_resume(msg_process_t process)
460 xbt_assert(process != nullptr, "Invalid parameter: First argument must not be nullptr");
462 TRACE_msg_process_resume(process);
463 simcall_process_resume(process);
467 /** \ingroup m_process_management
468 * \brief Returns true if the process is suspended .
470 * This checks whether a process is suspended or not by inspecting the task on which it was waiting for the completion.
472 int MSG_process_is_suspended(msg_process_t process)
474 xbt_assert(process != nullptr, "Invalid parameter: First argument must not be nullptr");
475 return simcall_process_is_suspended(process);
478 smx_context_t MSG_process_get_smx_ctx(msg_process_t process) {
479 return SIMIX_process_get_context(process);
482 * \ingroup m_process_management
483 * \brief Add a function to the list of "on_exit" functions for the current process.
484 * The on_exit functions are the functions executed when your process is killed.
485 * You should use them to free the data used by your process.
487 void MSG_process_on_exit(int_f_pvoid_pvoid_t fun, void *data) {
488 simcall_process_on_exit(MSG_process_self(),fun,data);
491 * \ingroup m_process_management
492 * \brief Sets the "auto-restart" flag of the process.
493 * If the flag is set to 1, the process will be automatically restarted when its host comes back up.
495 XBT_PUBLIC(void) MSG_process_auto_restart_set(msg_process_t process, int auto_restart) {
496 simcall_process_auto_restart_set(process,auto_restart);
499 * \ingroup m_process_management
500 * \brief Restarts a process from the beginning.
502 XBT_PUBLIC(msg_process_t) MSG_process_restart(msg_process_t process) {
503 return simcall_process_restart(process);