1 /* Copyright (c) 2004, 2005, 2006, 2007, 2008, 2009, 2010. 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"
11 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_process, msg,
12 "Logging specific to MSG (process)");
14 /** @addtogroup m_process_management
15 * \htmlonly <!-- DOXYGEN_NAVBAR_LABEL="Processes" --> \endhtmlonly
17 * We need to simulate many independent scheduling decisions, so
18 * the concept of <em>process</em> is at the heart of the
19 * simulator. A process may be defined as a <em>code</em>, with
20 * some <em>private data</em>, executing in a <em>location</em>.
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 = SIMIX_process_self_get_data(smx_proc);
38 SIMIX_process_self_set_data(smx_proc, NULL);
41 msg_proc = simcall_process_get_data(smx_proc);
42 simcall_process_set_data(smx_proc, NULL);
46 TRACE_msg_process_end(smx_proc);
49 // free the data if a function was provided
50 if (msg_proc->data && msg_global->process_data_cleanup) {
51 msg_global->process_data_cleanup(msg_proc->data);
54 // remove the process from its virtual machine
56 int pos = xbt_dynar_search(msg_proc->vm->processes,&smx_proc);
57 xbt_dynar_remove_at(msg_proc->vm->processes,pos, NULL);
60 // free the MSG process
64 /* This function creates a MSG process. It has the prototype enforced by SIMIX_function_register_process_create */
65 void MSG_process_create_from_SIMIX(smx_process_t* process, const char *name,
66 xbt_main_func_t code, void *data,
67 const char *hostname, double kill_time, int argc, char **argv,
68 xbt_dict_t properties)
70 m_host_t host = MSG_get_host_by_name(hostname);
71 m_process_t p = MSG_process_create_with_environment(name, code, data,
74 MSG_process_set_kill_time(p,kill_time);
75 *((m_process_t*) process) = p;
78 /** \ingroup m_process_management
79 * \brief Creates and runs a new #m_process_t.
81 * Does exactly the same as #MSG_process_create_with_arguments but without
82 providing standard arguments (\a argc, \a argv, \a start_time, \a kill_time).
83 * \sa MSG_process_create_with_arguments
85 m_process_t MSG_process_create(const char *name,
86 xbt_main_func_t code, void *data,
89 return MSG_process_create_with_environment(name, code, data, host, -1,
93 /** \ingroup m_process_management
94 * \brief Creates and runs a new #m_process_t.
96 * A constructor for #m_process_t taking four arguments and returning the
97 * corresponding object. The structure (and the corresponding thread) is
98 * created, and put in the list of ready process.
99 * \param name a name for the object. It is for user-level information
101 * \param code is a function describing the behavior of the process. It
102 should then only use functions described in \ref
103 m_process_management (to create a new #m_process_t for example),
104 in \ref m_host_management (only the read-only functions i.e. whose
105 name contains the word get), in \ref m_task_management (to create
106 or destroy some #m_task_t for example) and in \ref
107 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
109 object. It is for user-level information and can be NULL. It can
110 be retrieved with the function \ref MSG_process_get_data.
111 * \param host the location where the new process is executed.
112 * \param argc first argument passed to \a code
113 * \param argv second argument passed to \a code
115 * \return The new corresponding object.
118 m_process_t MSG_process_create_with_arguments(const char *name,
119 xbt_main_func_t code,
120 void *data, m_host_t host,
121 int argc, char **argv)
123 return MSG_process_create_with_environment(name, code, data, host,
127 /** \ingroup m_process_management
128 * \brief Creates and runs a new #m_process_t.
130 * A constructor for #m_process_t taking four arguments and returning the
131 * corresponding object. The structure (and the corresponding thread) is
132 * created, and put in the list of ready process.
133 * \param name a name for the object. It is for user-level information
135 * \param code is a function describing the behavior of the process. It
136 should then only use functions described in \ref
137 m_process_management (to create a new #m_process_t for example),
138 in \ref m_host_management (only the read-only functions i.e. whose
139 name contains the word get), in \ref m_task_management (to create
140 or destroy some #m_task_t for example) and in \ref
141 msg_task_usage (to handle file transfers and task processing).
142 * \param data a pointer to any data one may want to attach to the new
143 object. It is for user-level information and can be NULL. It can
144 be retrieved with the function \ref MSG_process_get_data.
145 * \param host the location where the new process is executed.
146 * \param argc first argument passed to \a code
147 * \param argv second argument passed to \a code
148 * \param properties list a properties defined for this process
150 * \return The new corresponding object.
152 m_process_t MSG_process_create_with_environment(const char *name,
153 xbt_main_func_t code,
154 void *data, m_host_t host,
155 int argc, char **argv,
156 xbt_dict_t properties)
158 xbt_assert(code != NULL && host != NULL, "Invalid parameters");
159 simdata_process_t simdata = xbt_new0(s_simdata_process_t, 1);
162 /* Simulator data for MSG */
163 simdata->PID = msg_global->PID++;
164 simdata->waiting_action = NULL;
165 simdata->waiting_task = NULL;
166 simdata->m_host = host;
167 simdata->argc = argc;
168 simdata->argv = argv;
169 simdata->data = data;
170 simdata->last_errno = MSG_OK;
172 if (SIMIX_process_self()) {
173 simdata->PPID = MSG_process_get_PID(MSG_process_self());
175 MSG_process_on_exit((int_f_pvoid_t)TRACE_msg_process_kill,MSG_process_self());
182 TRACE_msg_process_create(name, simdata->PID, simdata->m_host);
184 /* Let's create the process: SIMIX may decide to start it right now,
185 * even before returning the flow control to us */
186 simcall_process_create(&process, name, code, simdata, SIMIX_host_get_name(host->smx_host), -1,
187 argc, argv, properties);
190 /* Undo everything we have just changed */
199 /** \ingroup m_process_management
200 * \param process poor victim
202 * This function simply kills a \a process... scary isn't it ? :)
204 void MSG_process_kill(m_process_t process)
206 // /* FIXME: why do we only cancel communication actions? is this useful? */
207 // simdata_process_t p_simdata = simcall_process_get_data(process);
208 // if (p_simdata->waiting_task && p_simdata->waiting_task->simdata->comm) {
209 // simcall_comm_cancel(p_simdata->waiting_task->simdata->comm);
212 simcall_process_kill(process);
217 /** \ingroup m_process_management
218 * \brief Migrates a process to another location.
220 * This function checks whether \a process and \a host are valid pointers
221 and change the value of the #m_host_t on which \a process is running.
223 MSG_error_t MSG_process_migrate(m_process_t process, m_host_t host)
225 simdata_process_t simdata = simcall_process_get_data(process);
226 simdata->m_host = host;
228 m_host_t now = simdata->m_host;
229 TRACE_msg_process_change_host(process, now, host);
231 simcall_process_change_host(process, host->smx_host);
235 /** \ingroup m_process_management
236 * \brief Returns the user data of a process.
238 * This function checks whether \a process is a valid pointer or not
239 and returns the user data associated to this process.
241 void* MSG_process_get_data(m_process_t process)
243 xbt_assert(process != NULL, "Invalid parameter");
245 /* get from SIMIX the MSG process data, and then the user data */
246 simdata_process_t simdata = simcall_process_get_data(process);
247 return simdata->data;
250 /** \ingroup m_process_management
251 * \brief Sets the user data of a process.
253 * This function checks whether \a process is a valid pointer or not
254 and sets the user data associated to this process.
256 MSG_error_t MSG_process_set_data(m_process_t process, void *data)
258 xbt_assert(process != NULL, "Invalid parameter");
260 simdata_process_t simdata = simcall_process_get_data(process);
261 simdata->data = data;
266 /** \ingroup m_process_management
267 * \brief Sets a cleanup function to be called to free the userdata of a
268 * process when a process is destroyed.
269 * \param data_cleanup a cleanup function for the userdata of a process,
270 * or NULL to call no function
272 XBT_PUBLIC(void) MSG_process_set_data_cleanup(void_f_pvoid_t data_cleanup) {
274 msg_global->process_data_cleanup = data_cleanup;
277 /** \ingroup m_process_management
278 * \brief Return the location on which a process is running.
279 * \param process a process (NULL means the current one)
280 * \return the m_host_t corresponding to the location on which \a
281 * process is running.
283 m_host_t MSG_process_get_host(m_process_t process)
285 simdata_process_t simdata;
286 if (process == NULL) {
287 simdata = SIMIX_process_self_get_data(SIMIX_process_self());
290 simdata = simcall_process_get_data(process);
292 return simdata->m_host;
295 /** \ingroup m_process_management
297 * \brief Return a #m_process_t given its PID.
299 * This function search in the list of all the created m_process_t for a m_process_t
300 whose PID is equal to \a PID. If no host is found, \c NULL is returned.
301 Note that the PID are uniq in the whole simulation, not only on a given host.
303 m_process_t MSG_process_from_PID(int PID)
305 return SIMIX_process_from_PID(PID);
308 /** @brief returns a list of all currently existing processes */
309 xbt_dynar_t MSG_processes_as_dynar(void) {
310 return SIMIX_processes_as_dynar();
313 /** \ingroup m_process_management
314 * \brief Set the kill time of a process.
316 * \param process a process
317 * \param kill_time the time when the process is killed.
319 MSG_error_t MSG_process_set_kill_time(m_process_t process, double kill_time)
321 simcall_process_set_kill_time(process,kill_time);
325 /** \ingroup m_process_management
326 * \brief Returns the process ID of \a process.
328 * This function checks whether \a process is a valid pointer or not
329 and return its PID (or 0 in case of problem).
331 int MSG_process_get_PID(m_process_t process)
333 /* Do not raise an exception here: this function is called by the logs
334 * and the exceptions, so it would be called back again and again */
335 if (process == NULL) {
339 simdata_process_t simdata = simcall_process_get_data(process);
341 return simdata != NULL ? simdata->PID : 0;
344 /** \ingroup m_process_management
345 * \brief Returns the process ID of the parent of \a process.
347 * This function checks whether \a process is a valid pointer or not
348 and return its PID. Returns -1 if the process has not been created by
351 int MSG_process_get_PPID(m_process_t process)
353 xbt_assert(process != NULL, "Invalid parameter");
355 simdata_process_t simdata = simcall_process_get_data(process);
357 return simdata->PPID;
360 /** \ingroup m_process_management
361 * \brief Return the name of a process.
363 * This function checks whether \a process is a valid pointer or not
366 const char *MSG_process_get_name(m_process_t process)
368 xbt_assert(process, "Invalid parameter");
370 return simcall_process_get_name(process);
373 /** \ingroup m_process_management
374 * \brief Returns the value of a given process property
376 * \param process a process
377 * \param name a property name
378 * \return value of a property (or NULL if the property is not set)
380 const char *MSG_process_get_property_value(m_process_t process,
383 return xbt_dict_get_or_null(MSG_process_get_properties(process), name);
386 /** \ingroup m_process_management
387 * \brief Return the list of properties
389 * This function returns all the parameters associated with a process
391 xbt_dict_t MSG_process_get_properties(m_process_t process)
393 xbt_assert(process != NULL, "Invalid parameter");
395 return simcall_process_get_properties(process);
399 /** \ingroup m_process_management
400 * \brief Return the PID of the current process.
402 * This function returns the PID of the currently running #m_process_t.
404 int MSG_process_self_PID(void)
406 return MSG_process_get_PID(MSG_process_self());
409 /** \ingroup m_process_management
410 * \brief Return the PPID of the current process.
412 * This function returns the PID of the parent of the currently
413 * running #m_process_t.
415 int MSG_process_self_PPID(void)
417 return MSG_process_get_PPID(MSG_process_self());
420 /** \ingroup m_process_management
421 * \brief Return the current process.
423 * This function returns the currently running #m_process_t.
425 m_process_t MSG_process_self(void)
427 return SIMIX_process_self();
430 /** \ingroup m_process_management
431 * \brief Suspend the process.
433 * This function suspends the process by suspending the task on which
434 * it was waiting for the completion.
436 MSG_error_t MSG_process_suspend(m_process_t process)
438 xbt_assert(process != NULL, "Invalid parameter");
441 TRACE_msg_process_suspend(process);
444 simcall_process_suspend(process);
448 /** \ingroup m_process_management
449 * \brief Resume a suspended process.
451 * This function resumes a suspended process by resuming the task on
452 * which it was waiting for the completion.
454 MSG_error_t MSG_process_resume(m_process_t process)
456 xbt_assert(process != NULL, "Invalid parameter");
459 TRACE_msg_process_resume(process);
462 simcall_process_resume(process);
466 /** \ingroup m_process_management
467 * \brief Returns true if the process is suspended .
469 * This checks whether a process is suspended or not by inspecting the
470 * task on which it was waiting for the completion.
472 int MSG_process_is_suspended(m_process_t process)
474 xbt_assert(process != NULL, "Invalid parameter");
475 return simcall_process_is_suspended(process);
478 smx_context_t MSG_process_get_smx_ctx(m_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_t fun, void *data) {
488 SIMIX_process_on_exit(fun,data);