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 /** \defgroup m_process_management Management Functions of Agents
15 * \brief This section describes the agent structure of MSG
16 * (#m_process_t) and the functions for managing it.
18 /** @addtogroup m_process_management
19 * \htmlonly <!-- DOXYGEN_NAVBAR_LABEL="Agents" --> \endhtmlonly
21 * We need to simulate many independent scheduling decisions, so
22 * the concept of <em>process</em> is at the heart of the
23 * simulator. A process may be defined as a <em>code</em>, with
24 * some <em>private data</em>, executing in a <em>location</em>.
28 /******************************** Process ************************************/
29 void MSG_process_cleanup_from_SIMIX(smx_process_t smx_proc)
31 simdata_process_t msg_proc;
33 if (smx_proc == SIMIX_process_self()) {
34 /* avoid a SIMIX request if this function is called by the process itself */
35 msg_proc = SIMIX_process_self_get_data();
38 msg_proc = SIMIX_req_process_get_data(smx_proc);
42 TRACE_msg_process_end(smx_proc);
46 SIMIX_req_process_cleanup(smx_proc);
49 /* This function creates a MSG process. It has the prototype enforced by SIMIX_function_register_process_create */
50 void MSG_process_create_from_SIMIX(smx_process_t* process, const char *name,
51 xbt_main_func_t code, void *data,
52 const char *hostname, int argc, char **argv,
53 xbt_dict_t properties)
55 m_host_t host = MSG_get_host_by_name(hostname);
56 m_process_t p = MSG_process_create_with_environment(name, code, data,
59 *((m_process_t*) process) = p;
62 /** \ingroup m_process_management
63 * \brief Creates and runs a new #m_process_t.
65 * Does exactly the same as #MSG_process_create_with_arguments but without
66 providing standard arguments (\a argc, \a argv, \a start_time, \a kill_time).
67 * \sa MSG_process_create_with_arguments
69 m_process_t MSG_process_create(const char *name,
70 xbt_main_func_t code, void *data,
73 return MSG_process_create_with_environment(name, code, data, host, -1,
77 /** \ingroup m_process_management
78 * \brief Creates and runs a new #m_process_t.
80 * A constructor for #m_process_t taking four arguments and returning the
81 * corresponding object. The structure (and the corresponding thread) is
82 * created, and put in the list of ready process.
83 * \param name a name for the object. It is for user-level information
85 * \param code is a function describing the behavior of the agent. It
86 should then only use functions described in \ref
87 m_process_management (to create a new #m_process_t for example),
88 in \ref m_host_management (only the read-only functions i.e. whose
89 name contains the word get), in \ref m_task_management (to create
90 or destroy some #m_task_t for example) and in \ref
91 msg_gos_functions (to handle file transfers and task processing).
92 * \param data a pointer to any data one may want to attach to the new
93 object. It is for user-level information and can be NULL. It can
94 be retrieved with the function \ref MSG_process_get_data.
95 * \param host the location where the new agent is executed.
96 * \param argc first argument passed to \a code
97 * \param argv second argument passed to \a code
99 * \return The new corresponding object.
102 m_process_t MSG_process_create_with_arguments(const char *name,
103 xbt_main_func_t code,
104 void *data, m_host_t host,
105 int argc, char **argv)
107 return MSG_process_create_with_environment(name, code, data, host,
111 /** \ingroup m_process_management
112 * \brief Creates and runs a new #m_process_t.
114 * A constructor for #m_process_t taking four arguments and returning the
115 * corresponding object. The structure (and the corresponding thread) is
116 * created, and put in the list of ready process.
117 * \param name a name for the object. It is for user-level information
119 * \param code is a function describing the behavior of the agent. It
120 should then only use functions described in \ref
121 m_process_management (to create a new #m_process_t for example),
122 in \ref m_host_management (only the read-only functions i.e. whose
123 name contains the word get), in \ref m_task_management (to create
124 or destroy some #m_task_t for example) and in \ref
125 msg_gos_functions (to handle file transfers and task processing).
126 * \param data a pointer to any data one may want to attach to the new
127 object. It is for user-level information and can be NULL. It can
128 be retrieved with the function \ref MSG_process_get_data.
129 * \param host the location where the new agent is executed.
130 * \param argc first argument passed to \a code
131 * \param argv second argument passed to \a code
132 * \param properties list a properties defined for this process
134 * \return The new corresponding object.
136 m_process_t MSG_process_create_with_environment(const char *name,
137 xbt_main_func_t code,
138 void *data, m_host_t host,
139 int argc, char **argv,
140 xbt_dict_t properties)
142 xbt_assert0(code != NULL && host != NULL, "Invalid parameters");
143 simdata_process_t simdata = xbt_new0(s_simdata_process_t, 1);
146 /* Simulator data for MSG */
147 simdata->PID = msg_global->PID++;
148 simdata->waiting_action = NULL;
149 simdata->waiting_task = NULL;
150 simdata->m_host = host;
151 simdata->argc = argc;
152 simdata->argv = argv;
153 simdata->data = data;
154 simdata->last_errno = MSG_OK;
156 if (SIMIX_process_self()) {
157 simdata->PPID = MSG_process_get_PID(MSG_process_self());
162 /* Let's create the process: SIMIX may decide to start it right now,
163 * even before returning the flow control to us */
164 SIMIX_req_process_create(&process, name, code, simdata, host->name,
165 argc, argv, properties);
168 TRACE_msg_process_create(process);
172 /* Undo everything we have just changed */
181 void MSG_process_kill_from_SIMIX(smx_process_t p)
184 TRACE_msg_process_kill(p);
189 /** \ingroup m_process_management
190 * \param process poor victim
192 * This function simply kills a \a process... scary isn't it ? :)
194 void MSG_process_kill(m_process_t process)
197 TRACE_msg_process_kill(process);
200 /* FIXME: why do we only cancel communication actions? is this useful? */
201 simdata_process_t p_simdata = SIMIX_req_process_get_data(process);
202 if (p_simdata->waiting_task && p_simdata->waiting_task->simdata->comm) {
203 SIMIX_req_comm_cancel(p_simdata->waiting_task->simdata->comm);
206 SIMIX_req_process_kill(process);
211 /** \ingroup m_process_management
212 * \brief Migrates an agent to another location.
214 * This function checks whether \a process and \a host are valid pointers
215 and change the value of the #m_host_t on which \a process is running.
217 MSG_error_t MSG_process_change_host(m_host_t host)
219 m_process_t process = MSG_process_self();
220 simdata_process_t simdata = SIMIX_process_self_get_data();
221 m_host_t now = simdata->m_host;
222 simdata->m_host = host;
224 TRACE_msg_process_change_host(process, now, host);
226 SIMIX_req_process_change_host(process, now->name, host->name);
230 /** \ingroup m_process_management
231 * \brief Returns the user data of a process.
233 * This function checks whether \a process is a valid pointer or not
234 and returns the user data associated to this process.
236 void* MSG_process_get_data(m_process_t process)
238 xbt_assert0(process != NULL, "Invalid parameter");
240 /* get from SIMIX the MSG process data, and then the user data */
241 simdata_process_t simdata = SIMIX_req_process_get_data(process);
242 return simdata->data;
245 /** \ingroup m_process_management
246 * \brief Sets the user data of a process.
248 * This function checks whether \a process is a valid pointer or not
249 and sets the user data associated to this process.
251 MSG_error_t MSG_process_set_data(m_process_t process, void *data)
253 xbt_assert0(process != NULL, "Invalid parameter");
255 simdata_process_t simdata = SIMIX_req_process_get_data(process);
256 simdata->data = data;
261 /** \ingroup m_process_management
262 * \brief Return the location on which an agent is running.
264 * This function checks whether \a process is a valid pointer or not
265 and return the m_host_t corresponding to the location on which \a
268 m_host_t MSG_process_get_host(m_process_t process)
270 xbt_assert0(process != NULL, "Invalid parameter");
272 simdata_process_t simdata = SIMIX_req_process_get_data(process);
273 return simdata->m_host;
276 /** \ingroup m_process_management
278 * \brief Return a #m_process_t given its PID.
280 * This function search in the list of all the created m_process_t for a m_process_t
281 whose PID is equal to \a PID. If no host is found, \c NULL is returned.
282 Note that the PID are uniq in the whole simulation, not only on a given host.
284 m_process_t MSG_process_from_PID(int PID)
286 /* FIXME: reimplement this function using SIMIX when we have a good PID.
287 * In the meantime, I guess nobody uses it so it should not break anything. */
291 /** \ingroup m_process_management
292 * \brief Returns the process ID of \a process.
294 * This function checks whether \a process is a valid pointer or not
295 and return its PID (or 0 in case of problem).
297 int MSG_process_get_PID(m_process_t process)
299 /* Do not raise an exception here: this function is called by the logs
300 * and the exceptions, so it would be called back again and again */
301 if (process == NULL) {
305 simdata_process_t simdata = SIMIX_req_process_get_data(process);
307 return simdata != NULL ? simdata->PID : 0;
310 /** \ingroup m_process_management
311 * \brief Returns the process ID of the parent of \a process.
313 * This function checks whether \a process is a valid pointer or not
314 and return its PID. Returns -1 if the agent has not been created by
317 int MSG_process_get_PPID(m_process_t process)
319 xbt_assert0(process != NULL, "Invalid parameter");
321 simdata_process_t simdata = SIMIX_req_process_get_data(process);
323 return simdata->PPID;
326 /** \ingroup m_process_management
327 * \brief Return the name of an agent.
329 * This function checks whether \a process is a valid pointer or not
332 const char *MSG_process_get_name(m_process_t process)
334 xbt_assert0(process, "Invalid parameter");
336 return SIMIX_req_process_get_name(process);
339 /** \ingroup m_process_management
340 * \brief Returns the value of a given process property
342 * \param process a process
343 * \param name a property name
344 * \return value of a property (or NULL if the property is not set)
346 const char *MSG_process_get_property_value(m_process_t process,
349 return xbt_dict_get_or_null(MSG_process_get_properties(process), name);
352 /** \ingroup m_process_management
353 * \brief Return the list of properties
355 * This function returns all the parameters associated with a process
357 xbt_dict_t MSG_process_get_properties(m_process_t process)
359 xbt_assert0(process != NULL, "Invalid parameter");
361 return SIMIX_req_process_get_properties(process);
365 /** \ingroup m_process_management
366 * \brief Return the PID of the current agent.
368 * This function returns the PID of the currently running #m_process_t.
370 int MSG_process_self_PID(void)
372 return MSG_process_get_PID(MSG_process_self());
375 /** \ingroup m_process_management
376 * \brief Return the PPID of the current agent.
378 * This function returns the PID of the parent of the currently
379 * running #m_process_t.
381 int MSG_process_self_PPID(void)
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 #m_process_t.
391 m_process_t MSG_process_self(void)
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
400 * it was waiting for the completion.
402 MSG_error_t MSG_process_suspend(m_process_t process)
404 xbt_assert0(process != NULL, "Invalid parameter");
408 TRACE_msg_process_suspend(process);
411 SIMIX_req_process_suspend(process);
415 /** \ingroup m_process_management
416 * \brief Resume a suspended process.
418 * This function resumes a suspended process by resuming the task on
419 * which it was waiting for the completion.
421 MSG_error_t MSG_process_resume(m_process_t process)
423 xbt_assert0(process != NULL, "Invalid parameter");
427 TRACE_msg_process_resume(process);
430 SIMIX_req_process_resume(process);
434 /** \ingroup m_process_management
435 * \brief Returns true if the process is suspended .
437 * This checks whether a process is suspended or not by inspecting the
438 * task on which it was waiting for the completion.
440 int MSG_process_is_suspended(m_process_t process)
442 xbt_assert0(process != NULL, "Invalid parameter");
443 return SIMIX_req_process_is_suspended(process);
446 smx_context_t MSG_process_get_smx_ctx(m_process_t process) {
447 return SIMIX_process_get_context(process);