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 void MSG_process_kill_from_SIMIX(smx_process_t p)
202 TRACE_msg_process_kill(p);
207 /** \ingroup m_process_management
208 * \param process poor victim
210 * This function simply kills a \a process... scary isn't it ? :)
212 void MSG_process_kill(m_process_t process)
215 TRACE_msg_process_kill(process);
218 // /* FIXME: why do we only cancel communication actions? is this useful? */
219 // simdata_process_t p_simdata = simcall_process_get_data(process);
220 // if (p_simdata->waiting_task && p_simdata->waiting_task->simdata->comm) {
221 // simcall_comm_cancel(p_simdata->waiting_task->simdata->comm);
224 simcall_process_kill(process);
229 /** \ingroup m_process_management
230 * \brief Migrates a process to another location.
232 * This function checks whether \a process and \a host are valid pointers
233 and change the value of the #m_host_t on which \a process is running.
235 MSG_error_t MSG_process_migrate(m_process_t process, m_host_t host)
237 simdata_process_t simdata = simcall_process_get_data(process);
238 simdata->m_host = host;
240 m_host_t now = simdata->m_host;
241 TRACE_msg_process_change_host(process, now, host);
243 simcall_process_change_host(process, host->smx_host);
247 /** \ingroup m_process_management
248 * \brief Returns the user data of a process.
250 * This function checks whether \a process is a valid pointer or not
251 and returns the user data associated to this process.
253 void* MSG_process_get_data(m_process_t process)
255 xbt_assert(process != NULL, "Invalid parameter");
257 /* get from SIMIX the MSG process data, and then the user data */
258 simdata_process_t simdata = simcall_process_get_data(process);
259 return simdata->data;
262 /** \ingroup m_process_management
263 * \brief Sets the user data of a process.
265 * This function checks whether \a process is a valid pointer or not
266 and sets the user data associated to this process.
268 MSG_error_t MSG_process_set_data(m_process_t process, void *data)
270 xbt_assert(process != NULL, "Invalid parameter");
272 simdata_process_t simdata = simcall_process_get_data(process);
273 simdata->data = data;
278 /** \ingroup m_process_management
279 * \brief Sets a cleanup function to be called to free the userdata of a
280 * process when a process is destroyed.
281 * \param data_cleanup a cleanup function for the userdata of a process,
282 * or NULL to call no function
284 XBT_PUBLIC(void) MSG_process_set_data_cleanup(void_f_pvoid_t data_cleanup) {
286 msg_global->process_data_cleanup = data_cleanup;
289 /** \ingroup m_process_management
290 * \brief Return the location on which a process is running.
291 * \param process a process (NULL means the current one)
292 * \return the m_host_t corresponding to the location on which \a
293 * process is running.
295 m_host_t MSG_process_get_host(m_process_t process)
297 simdata_process_t simdata;
298 if (process == NULL) {
299 simdata = SIMIX_process_self_get_data(SIMIX_process_self());
302 simdata = simcall_process_get_data(process);
304 return simdata->m_host;
307 /** \ingroup m_process_management
309 * \brief Return a #m_process_t given its PID.
311 * This function search in the list of all the created m_process_t for a m_process_t
312 whose PID is equal to \a PID. If no host is found, \c NULL is returned.
313 Note that the PID are uniq in the whole simulation, not only on a given host.
315 m_process_t MSG_process_from_PID(int PID)
317 return SIMIX_process_from_PID(PID);
320 /** @brief returns a list of all currently existing processes */
321 xbt_dynar_t MSG_processes_as_dynar(void) {
322 return SIMIX_processes_as_dynar();
325 /** \ingroup m_process_management
326 * \brief Set the kill time of a process.
328 * \param process a process
329 * \param kill_time the time when the process is killed.
331 MSG_error_t MSG_process_set_kill_time(m_process_t process, double kill_time)
333 simcall_process_set_kill_time(process,kill_time);
337 /** \ingroup m_process_management
338 * \brief Returns the process ID of \a process.
340 * This function checks whether \a process is a valid pointer or not
341 and return its PID (or 0 in case of problem).
343 int MSG_process_get_PID(m_process_t process)
345 /* Do not raise an exception here: this function is called by the logs
346 * and the exceptions, so it would be called back again and again */
347 if (process == NULL) {
351 simdata_process_t simdata = simcall_process_get_data(process);
353 return simdata != NULL ? simdata->PID : 0;
356 /** \ingroup m_process_management
357 * \brief Returns the process ID of the parent of \a process.
359 * This function checks whether \a process is a valid pointer or not
360 and return its PID. Returns -1 if the process has not been created by
363 int MSG_process_get_PPID(m_process_t process)
365 xbt_assert(process != NULL, "Invalid parameter");
367 simdata_process_t simdata = simcall_process_get_data(process);
369 return simdata->PPID;
372 /** \ingroup m_process_management
373 * \brief Return the name of a process.
375 * This function checks whether \a process is a valid pointer or not
378 const char *MSG_process_get_name(m_process_t process)
380 xbt_assert(process, "Invalid parameter");
382 return simcall_process_get_name(process);
385 /** \ingroup m_process_management
386 * \brief Returns the value of a given process property
388 * \param process a process
389 * \param name a property name
390 * \return value of a property (or NULL if the property is not set)
392 const char *MSG_process_get_property_value(m_process_t process,
395 return 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(m_process_t process)
405 xbt_assert(process != NULL, "Invalid parameter");
407 return simcall_process_get_properties(process);
411 /** \ingroup m_process_management
412 * \brief Return the PID of the current process.
414 * This function returns the PID of the currently running #m_process_t.
416 int MSG_process_self_PID(void)
418 return MSG_process_get_PID(MSG_process_self());
421 /** \ingroup m_process_management
422 * \brief Return the PPID of the current process.
424 * This function returns the PID of the parent of the currently
425 * running #m_process_t.
427 int MSG_process_self_PPID(void)
429 return MSG_process_get_PPID(MSG_process_self());
432 /** \ingroup m_process_management
433 * \brief Return the current process.
435 * This function returns the currently running #m_process_t.
437 m_process_t MSG_process_self(void)
439 return SIMIX_process_self();
442 /** \ingroup m_process_management
443 * \brief Suspend the process.
445 * This function suspends the process by suspending the task on which
446 * it was waiting for the completion.
448 MSG_error_t MSG_process_suspend(m_process_t process)
450 xbt_assert(process != NULL, "Invalid parameter");
453 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
464 * which it was waiting for the completion.
466 MSG_error_t MSG_process_resume(m_process_t process)
468 xbt_assert(process != NULL, "Invalid parameter");
471 TRACE_msg_process_resume(process);
474 simcall_process_resume(process);
478 /** \ingroup m_process_management
479 * \brief Returns true if the process is suspended .
481 * This checks whether a process is suspended or not by inspecting the
482 * task on which it was waiting for the completion.
484 int MSG_process_is_suspended(m_process_t process)
486 xbt_assert(process != NULL, "Invalid parameter");
487 return simcall_process_is_suspended(process);
490 smx_context_t MSG_process_get_smx_ctx(m_process_t process) {
491 return SIMIX_process_get_context(process);
494 * \ingroup m_process_management
495 * \brief Add a function to the list of "on_exit" functions for the current process.
496 * The on_exit functions are the functions executed when your process is killed.
497 * You should use them to free the data used by your process.
499 void MSG_process_on_exit(int_f_pvoid_t fun, void *data) {
500 SIMIX_process_on_exit(fun,data);