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 "xbt/sysdep.h"
11 #include "xbt/functional.hpp"
13 #include "msg_private.hpp"
14 #include "src/simix/ActorImpl.hpp"
15 #include "src/simix/smx_private.h"
17 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_process, msg, "Logging specific to MSG (process)");
19 /** @addtogroup m_process_management
21 * Processes (#msg_process_t) are independent agents that can do stuff on their own. They are in charge of executing
22 * your code interacting with the simulated world.
23 * A process may be defined as a <em>code</em> with some <em>private data</em>.
24 * Processes must be located on <em>hosts</em> (#msg_host_t), and they exchange data by sending tasks (#msg_task_t)
25 * that are similar to envelops containing data.
28 /******************************** Process ************************************/
30 * \brief Cleans the MSG data of a process.
31 * \param smx_proc a SIMIX process
33 void MSG_process_cleanup_from_SIMIX(smx_actor_t smx_proc)
35 simdata_process_t msg_proc;
37 // get the MSG process from the SIMIX process
38 if (smx_proc == SIMIX_process_self()) {
39 /* avoid a SIMIX request if this function is called by the process itself */
40 msg_proc = (simdata_process_t) SIMIX_process_self_get_data();
41 SIMIX_process_self_set_data(nullptr);
43 msg_proc = (simdata_process_t) simcall_process_get_data(smx_proc);
44 simcall_process_set_data(smx_proc, nullptr);
47 TRACE_msg_process_destroy(smx_proc->name.c_str(), smx_proc->pid);
48 // free the data if a function was provided
49 if (msg_proc && msg_proc->data && msg_global->process_data_cleanup) {
50 msg_global->process_data_cleanup(msg_proc->data);
53 // free the MSG process
55 SIMIX_process_cleanup(smx_proc);
58 /* This function creates a MSG process. It has the prototype enforced by SIMIX_function_register_process_create */
59 smx_actor_t MSG_process_create_from_SIMIX(
60 const char *name, std::function<void()> code, void *data, const char *hostname,
61 double kill_time, xbt_dict_t properties,
62 int auto_restart, smx_actor_t parent_process)
64 msg_host_t host = MSG_host_by_name(hostname);
65 msg_process_t p = MSG_process_create_with_environment(
66 name, std::move(code), data, host, properties);
68 MSG_process_set_kill_time(p,kill_time);
69 MSG_process_auto_restart_set(p,auto_restart);
74 /** \ingroup m_process_management
75 * \brief Creates and runs a new #msg_process_t.
77 * Does exactly the same as #MSG_process_create_with_arguments but without providing standard arguments
78 * (\a argc, \a argv, \a start_time, \a kill_time).
79 * \sa MSG_process_create_with_arguments
81 msg_process_t MSG_process_create(const char *name, xbt_main_func_t code, void *data, msg_host_t host)
83 return MSG_process_create_with_environment(name, code, data, host, 0, nullptr, nullptr);
86 /** \ingroup m_process_management
87 * \brief Creates and runs a new #msg_process_t.
89 * A constructor for #msg_process_t taking four arguments and returning the corresponding object. The structure (and
90 * the corresponding thread) is created, and put in the list of ready process.
91 * \param name a name for the object. It is for user-level information and can be nullptr.
92 * \param code is a function describing the behavior of the process. It should then only use functions described
93 * in \ref m_process_management (to create a new #msg_process_t for example),
94 in \ref m_host_management (only the read-only functions i.e. whose name contains the word get),
95 in \ref m_task_management (to create or destroy some #msg_task_t for example) and
96 in \ref msg_task_usage (to handle file transfers and task processing).
97 * \param data a pointer to any data one may want to attach to the new object. It is for user-level information and
98 * can be nullptr. It can be retrieved with the function \ref MSG_process_get_data.
99 * \param host the location where the new process is executed.
100 * \param argc first argument passed to \a code
101 * \param argv second argument passed to \a code
103 * \return The new corresponding object.
106 msg_process_t MSG_process_create_with_arguments(const char *name, xbt_main_func_t code, void *data, msg_host_t host,
107 int argc, char **argv)
109 return MSG_process_create_with_environment(name, code, data, host, argc, argv, nullptr);
112 /** \ingroup m_process_management
113 * \brief Creates and runs a new #msg_process_t.
115 * A constructor for #msg_process_t taking four arguments and returning the corresponding object. The structure (and
116 * the corresponding thread) is created, and put in the list of ready process.
117 * \param name a name for the object. It is for user-level information and can be nullptr.
118 * \param code is a function describing the behavior of the process. It should then only use functions described
119 * in \ref m_process_management (to create a new #msg_process_t for example),
120 in \ref m_host_management (only the read-only functions i.e. whose name contains the word get),
121 in \ref m_task_management (to create or destroy some #msg_task_t for example) and
122 in \ref msg_task_usage (to handle file transfers and task processing).
123 * \param data a pointer to any data one may want to attach to the new object. It is for user-level information and
124 * can be nullptr. It can be retrieved with the function \ref MSG_process_get_data.
125 * \param host the location where the new process is executed.
126 * \param argc first argument passed to \a code
127 * \param argv second argument passed to \a code. WARNING, these strings are freed by the SimGrid kernel when the
128 * process exits, so they cannot be static nor shared between several processes.
129 * \param properties list a properties defined for this process
131 * \return The new corresponding object.
133 msg_process_t MSG_process_create_with_environment(const char *name, xbt_main_func_t code, void *data, msg_host_t host,
134 int argc, char **argv, xbt_dict_t properties)
136 std::function<void()> function;
138 function = simgrid::xbt::wrapMain(code, argc, const_cast<const char*const*>(argv));
139 msg_process_t res = MSG_process_create_with_environment(name,
140 std::move(function), data, host, properties);
141 for (int i = 0; i != argc; ++i)
147 msg_process_t MSG_process_create_with_environment(
148 const char *name, std::function<void()> code, void *data,
149 msg_host_t host, xbt_dict_t properties)
151 xbt_assert(code != nullptr && host != nullptr, "Invalid parameters: host and code params must not be nullptr");
152 simdata_process_t simdata = xbt_new0(s_simdata_process_t, 1);
153 msg_process_t process;
155 /* Simulator data for MSG */
156 simdata->waiting_action = nullptr;
157 simdata->waiting_task = nullptr;
158 simdata->m_host = host;
159 simdata->data = data;
160 simdata->last_errno = MSG_OK;
162 /* Let's create the process: SIMIX may decide to start it right now,
163 * even before returning the flow control to us */
164 process = simcall_process_create(
165 name, std::move(code), simdata, sg_host_get_name(host), -1, properties, 0);
168 /* Undo everything we have just changed */
173 simcall_process_on_exit(process,(int_f_pvoid_pvoid_t)TRACE_msg_process_kill,process);
178 static int MSG_maestro(int argc, char** argv)
180 int res = MSG_main();
184 /* Become a process in the simulation
186 * Currently this can only be called by the main thread (once) and only work with some thread factories
187 * (currently ThreadContextFactory).
189 * In the future, it might be extended in order to attach other threads created by a third party library.
191 msg_process_t MSG_process_attach(const char *name, void *data, msg_host_t host, xbt_dict_t properties)
193 xbt_assert(host != nullptr, "Invalid parameters: host and code params must not be nullptr");
194 simdata_process_t simdata = xbt_new0(s_simdata_process_t, 1);
195 msg_process_t process;
197 /* Simulator data for MSG */
198 simdata->waiting_action = nullptr;
199 simdata->waiting_task = nullptr;
200 simdata->m_host = host;
201 simdata->data = data;
202 simdata->last_errno = MSG_OK;
204 /* Let's create the process: SIMIX may decide to start it right now, even before returning the flow control to us */
205 process = SIMIX_process_attach(name, simdata, sg_host_get_name(host), properties, nullptr);
207 xbt_die("Could not attach");
208 simcall_process_on_exit(process,(int_f_pvoid_pvoid_t)TRACE_msg_process_kill,process);
212 /** Detach a process attached with `MSG_process_attach()`
214 * This is called when the current process has finished its job.
215 * Used in the main thread, it waits for the simulation to finish before returning. When it returns, the other
216 * simulated processes and the maestro are destroyed.
218 void MSG_process_detach()
220 SIMIX_process_detach();
223 /** \ingroup m_process_management
224 * \param process poor victim
226 * This function simply kills a \a process... scary isn't it ? :)
228 void MSG_process_kill(msg_process_t process)
230 // /* FIXME: why do we only cancel communication actions? is this useful? */
231 // simdata_process_t p_simdata = simcall_process_get_data(process);
232 // if (p_simdata->waiting_task && p_simdata->waiting_task->simdata->comm) {
233 // simcall_comm_cancel(p_simdata->waiting_task->simdata->comm);
235 simcall_process_kill(process);
239 * \brief Wait for the completion of a #msg_process_t.
241 * \param process the process to wait for
242 * \param timeout wait until the process is over, or the timeout occurs
244 msg_error_t MSG_process_join(msg_process_t process, double timeout){
245 simcall_process_join(process, timeout);
249 /** \ingroup m_process_management
250 * \brief Migrates a process to another location.
252 * This function checks whether \a process and \a host are valid pointers and change the value of the #msg_host_t on
253 * which \a process is running.
255 msg_error_t MSG_process_migrate(msg_process_t process, msg_host_t host)
257 simdata_process_t simdata = (simdata_process_t) simcall_process_get_data(process);
258 simdata->m_host = host;
259 msg_host_t now = simdata->m_host;
260 TRACE_msg_process_change_host(process, now, host);
261 simcall_process_set_host(process, host);
265 /** \ingroup m_process_management
266 * \brief Returns the user data of a process.
268 * This function checks whether \a process is a valid pointer and returns the user data associated to this process.
270 void* MSG_process_get_data(msg_process_t process)
272 xbt_assert(process != nullptr, "Invalid parameter: first parameter must not be nullptr!");
274 /* get from SIMIX the MSG process data, and then the user data */
275 simdata_process_t simdata = (simdata_process_t) simcall_process_get_data(process);
277 return simdata->data;
282 /** \ingroup m_process_management
283 * \brief Sets the user data of a process.
285 * This function checks whether \a process is a valid pointer and sets the user data associated to this process.
287 msg_error_t MSG_process_set_data(msg_process_t process, void *data)
289 xbt_assert(process != nullptr, "Invalid parameter: first parameter must not be nullptr!");
291 simdata_process_t simdata = (simdata_process_t) simcall_process_get_data(process);
292 simdata->data = data;
297 /** \ingroup m_process_management
298 * \brief Sets a cleanup function to be called to free the userdata of a process when a process is destroyed.
299 * \param data_cleanup a cleanup function for the userdata of a process, or nullptr to call no function
301 XBT_PUBLIC(void) MSG_process_set_data_cleanup(void_f_pvoid_t data_cleanup) {
302 msg_global->process_data_cleanup = data_cleanup;
305 /** \ingroup m_process_management
306 * \brief Return the location on which a process is running.
307 * \param process a process (nullptr means the current one)
308 * \return the msg_host_t corresponding to the location on which \a process is running.
310 msg_host_t MSG_process_get_host(msg_process_t process)
312 simdata_process_t simdata;
313 if (process == nullptr) {
314 simdata = (simdata_process_t) SIMIX_process_self_get_data();
317 simdata = (simdata_process_t) simcall_process_get_data(process);
319 return simdata ? simdata->m_host : nullptr;
322 /** \ingroup m_process_management
324 * \brief Return a #msg_process_t given its PID.
326 * 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.
327 * If no host is found, \c nullptr is returned.
328 Note that the PID are uniq in the whole simulation, not only on a given host.
330 msg_process_t MSG_process_from_PID(int PID)
332 return SIMIX_process_from_PID(PID);
335 /** @brief returns a list of all currently existing processes */
336 xbt_dynar_t MSG_processes_as_dynar() {
337 return SIMIX_processes_as_dynar();
340 /** @brief Return the current number MSG processes. */
341 int MSG_process_get_number()
343 return SIMIX_process_count();
346 /** \ingroup m_process_management
347 * \brief Set the kill time of a process.
349 * \param process a process
350 * \param kill_time the time when the process is killed.
352 msg_error_t MSG_process_set_kill_time(msg_process_t process, double kill_time)
354 simcall_process_set_kill_time(process,kill_time);
358 /** \ingroup m_process_management
359 * \brief Returns the process ID of \a process.
361 * This function checks whether \a process is a valid pointer and return its PID (or 0 in case of problem).
363 int MSG_process_get_PID(msg_process_t process)
365 /* Do not raise an exception here: this function is called by the logs
366 * and the exceptions, so it would be called back again and again */
367 if (process == nullptr)
372 /** \ingroup m_process_management
373 * \brief Returns the process ID of the parent of \a process.
375 * This function checks whether \a process is a valid pointer and return its PID.
376 * Returns -1 if the process has not been created by any other process.
378 int MSG_process_get_PPID(msg_process_t process)
380 return process->ppid;
383 /** \ingroup m_process_management
384 * \brief Return the name of a process.
386 * This function checks whether \a process is a valid pointer and return its name.
388 const char *MSG_process_get_name(msg_process_t process)
390 return process->name.c_str();
393 /** \ingroup m_process_management
394 * \brief Returns the value of a given process property
396 * \param process a process
397 * \param name a property name
398 * \return value of a property (or nullptr if the property is not set)
400 const char *MSG_process_get_property_value(msg_process_t process, const char *name)
402 return (char*) xbt_dict_get_or_null(MSG_process_get_properties(process), name);
405 /** \ingroup m_process_management
406 * \brief Return the list of properties
408 * This function returns all the parameters associated with a process
410 xbt_dict_t MSG_process_get_properties(msg_process_t process)
412 xbt_assert(process != nullptr, "Invalid parameter: First argument must not be nullptr");
413 return simcall_process_get_properties(process);
416 /** \ingroup m_process_management
417 * \brief Return the PID of the current process.
419 * This function returns the PID of the currently running #msg_process_t.
421 int MSG_process_self_PID()
423 return MSG_process_get_PID(MSG_process_self());
426 /** \ingroup m_process_management
427 * \brief Return the PPID of the current process.
429 * This function returns the PID of the parent of the currently running #msg_process_t.
431 int MSG_process_self_PPID()
433 return MSG_process_get_PPID(MSG_process_self());
436 /** \ingroup m_process_management
437 * \brief Return the current process.
439 * This function returns the currently running #msg_process_t.
441 msg_process_t MSG_process_self()
443 return SIMIX_process_self();
446 /** \ingroup m_process_management
447 * \brief Suspend the process.
449 * This function suspends the process by suspending the task on which it was waiting for the completion.
451 msg_error_t MSG_process_suspend(msg_process_t process)
453 xbt_assert(process != nullptr, "Invalid parameter: First argument must not be nullptr");
455 TRACE_msg_process_suspend(process);
456 simcall_process_suspend(process);
460 /** \ingroup m_process_management
461 * \brief Resume a suspended process.
463 * This function resumes a suspended process by resuming the task on which it was waiting for the completion.
465 msg_error_t MSG_process_resume(msg_process_t process)
467 xbt_assert(process != nullptr, "Invalid parameter: First argument must not be nullptr");
469 TRACE_msg_process_resume(process);
470 simcall_process_resume(process);
474 /** \ingroup m_process_management
475 * \brief Returns true if the process is suspended .
477 * This checks whether a process is suspended or not by inspecting the task on which it was waiting for the completion.
479 int MSG_process_is_suspended(msg_process_t process)
481 xbt_assert(process != nullptr, "Invalid parameter: First argument must not be nullptr");
482 return simcall_process_is_suspended(process);
485 smx_context_t MSG_process_get_smx_ctx(msg_process_t process) {
486 return SIMIX_process_get_context(process);
489 * \ingroup m_process_management
490 * \brief Add a function to the list of "on_exit" functions for the current process.
491 * The on_exit functions are the functions executed when your process is killed.
492 * You should use them to free the data used by your process.
494 void MSG_process_on_exit(int_f_pvoid_pvoid_t fun, void *data) {
495 simcall_process_on_exit(MSG_process_self(),fun,data);
498 * \ingroup m_process_management
499 * \brief Sets the "auto-restart" flag of the process.
500 * If the flag is set to 1, the process will be automatically restarted when 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);