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"
10 #include "../simix/private.h"
12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_process, msg,
13 "Logging specific to MSG (process)");
15 /** \defgroup m_process_management Management Functions of Agents
16 * \brief This section describes the agent structure of MSG
17 * (#m_process_t) and the functions for managing it.
19 /** @addtogroup m_process_management
20 * \htmlonly <!-- DOXYGEN_NAVBAR_LABEL="Agents" --> \endhtmlonly
22 * We need to simulate many independent scheduling decisions, so
23 * the concept of <em>process</em> is at the heart of the
24 * simulator. A process may be defined as a <em>code</em>, with
25 * some <em>private data</em>, executing in a <em>location</em>.
29 /******************************** Process ************************************/
30 void __MSG_process_cleanup(void *arg)
32 /* arg is a pointer to a simix process, we can get the msg process with the field data */
33 m_process_t proc = ((smx_process_t) arg)->data;
35 TRACE_msg_process_end (proc);
37 xbt_fifo_remove(msg_global->process_list, proc);
38 SIMIX_process_cleanup(arg);
52 /* This function creates a MSG process. It has the prototype enforced by SIMIX_function_register_process_create */
53 void *_MSG_process_create_from_SIMIX(const char *name,
54 xbt_main_func_t code, void *data,
55 char *hostname, int argc, char **argv,
56 xbt_dict_t properties)
58 m_host_t host = MSG_get_host_by_name(hostname);
59 return (void *) MSG_process_create_with_environment(name, code, data, host,
60 argc, argv, properties);
63 /** \ingroup m_process_management
64 * \brief Creates and runs a new #m_process_t.
66 * Does exactly the same as #MSG_process_create_with_arguments but without
67 providing standard arguments (\a argc, \a argv, \a start_time, \a kill_time).
68 * \sa MSG_process_create_with_arguments
70 m_process_t MSG_process_create(const char *name,
71 xbt_main_func_t code, void *data,
74 return MSG_process_create_with_environment(name, code, data, host, -1,
78 /** \ingroup m_process_management
79 * \brief Creates and runs a new #m_process_t.
81 * A constructor for #m_process_t taking four arguments and returning the
82 * corresponding object. The structure (and the corresponding thread) is
83 * created, and put in the list of ready process.
84 * \param name a name for the object. It is for user-level information
86 * \param code is a function describing the behavior of the agent. It
87 should then only use functions described in \ref
88 m_process_management (to create a new #m_process_t for example),
89 in \ref m_host_management (only the read-only functions i.e. whose
90 name contains the word get), in \ref m_task_management (to create
91 or destroy some #m_task_t for example) and in \ref
92 msg_gos_functions (to handle file transfers and task processing).
93 * \param data a pointer to any data one may want to attach to the new
94 object. It is for user-level information and can be NULL. It can
95 be retrieved with the function \ref MSG_process_get_data.
96 * \param host the location where the new agent is executed.
97 * \param argc first argument passed to \a code
98 * \param argv second argument passed to \a code
100 * \return The new corresponding object.
103 m_process_t MSG_process_create_with_arguments(const char *name,
104 xbt_main_func_t code,
105 void *data, m_host_t host,
106 int argc, char **argv)
108 return MSG_process_create_with_environment(name, code, data, host,
112 /** \ingroup m_process_management
113 * \brief Creates and runs a new #m_process_t.
115 * A constructor for #m_process_t taking four arguments and returning the
116 * corresponding object. The structure (and the corresponding thread) is
117 * created, and put in the list of ready process.
118 * \param name a name for the object. It is for user-level information
120 * \param code is a function describing the behavior of the agent. It
121 should then only use functions described in \ref
122 m_process_management (to create a new #m_process_t for example),
123 in \ref m_host_management (only the read-only functions i.e. whose
124 name contains the word get), in \ref m_task_management (to create
125 or destroy some #m_task_t for example) and in \ref
126 msg_gos_functions (to handle file transfers and task processing).
127 * \param data a pointer to any data one may want to attach to the new
128 object. It is for user-level information and can be NULL. It can
129 be retrieved with the function \ref MSG_process_get_data.
130 * \param host the location where the new agent is executed.
131 * \param argc first argument passed to \a code
132 * \param argv second argument passed to \a code
133 * \param properties list a properties defined for this process
135 * \return The new corresponding object.
137 m_process_t MSG_process_create_with_environment(const char *name,
138 xbt_main_func_t code,
139 void *data, m_host_t host,
140 int argc, char **argv,
141 xbt_dict_t properties)
143 simdata_process_t simdata = NULL;
144 m_process_t process = xbt_new0(s_m_process_t, 1);
145 smx_process_t smx_process = NULL;
146 xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
148 smx_process = SIMIX_process_create(name, code,
149 (void *) process, host->name,
150 argc, argv, properties);
156 simdata = xbt_new0(s_simdata_process_t, 1);
159 simdata->PID = msg_global->PID++;
160 simdata->waiting_action = NULL;
161 simdata->waiting_task = NULL;
162 simdata->m_host = host;
163 simdata->argc = argc;
164 simdata->argv = argv;
165 simdata->s_process = smx_process;
167 if (SIMIX_process_self()) {
168 simdata->PPID = MSG_process_get_PID(SIMIX_process_self()->data);
172 simdata->last_errno = MSG_OK;
175 /* Process structure */
176 process->name = xbt_strdup(name);
177 process->simdata = simdata;
178 process->data = data;
180 xbt_fifo_unshift(msg_global->process_list, process);
186 void _MSG_process_kill_from_SIMIX(void *p)
189 TRACE_msg_process_kill ((m_process_t) p);
191 MSG_process_kill((m_process_t) p);
194 /** \ingroup m_process_management
195 * \param process poor victim
197 * This function simply kills a \a process... scarry isn't it ? :)
199 void MSG_process_kill(m_process_t process)
201 simdata_process_t p_simdata = process->simdata;
204 TRACE_msg_process_kill (process);
207 DEBUG3("Killing %s(%d) on %s",
208 process->name, p_simdata->PID, p_simdata->m_host->name);
210 if (p_simdata->waiting_task && p_simdata->waiting_task->simdata->comm) {
211 SIMIX_communication_cancel(p_simdata->waiting_task->simdata->comm);
214 if (p_simdata->waiting_action) {
215 DEBUG1("Canceling waiting task %s",
216 SIMIX_action_get_name(p_simdata->waiting_action));
217 SIMIX_action_cancel(p_simdata->waiting_action);
220 xbt_fifo_remove(msg_global->process_list, process);
221 SIMIX_process_kill(process->simdata->s_process);
226 /** \ingroup m_process_management
227 * \brief Migrates an agent to another location.
229 * This function checks whether \a process and \a host are valid pointers
230 and change the value of the #m_host_t on which \a process is running.
232 MSG_error_t MSG_process_change_host(m_host_t host)
234 m_process_t process = MSG_process_self();
235 m_host_t now = process->simdata->m_host;
236 process->simdata->m_host = host;
238 TRACE_msg_process_change_host (process, now, host);
240 SIMIX_process_change_host(process->simdata->s_process, now->name,
245 /** \ingroup m_process_management
246 * \brief Return the user data of a #m_process_t.
248 * This function checks whether \a process is a valid pointer or not
249 and return the user data associated to \a process if it is possible.
251 void *MSG_process_get_data(m_process_t process)
253 xbt_assert0((process != NULL), "Invalid parameters");
255 return (process->data);
258 /** \ingroup m_process_management
259 * \brief Set the user data of a #m_process_t.
261 * This function checks whether \a process is a valid pointer or not
262 and set the user data associated to \a process if it is possible.
264 MSG_error_t MSG_process_set_data(m_process_t process, void *data)
266 xbt_assert0((process != NULL), "Invalid parameters");
268 process->data = data;
273 /** \ingroup m_process_management
274 * \brief Return the location on which an agent is running.
276 * This function checks whether \a process is a valid pointer or not
277 and return the m_host_t corresponding to the location on which \a
280 m_host_t MSG_process_get_host(m_process_t process)
282 xbt_assert0(((process != NULL)
283 && (process->simdata)), "Invalid parameters");
285 return (((simdata_process_t) process->simdata)->m_host);
288 /** \ingroup m_process_management
290 * \brief Return a #m_process_t given its PID.
292 * This function search in the list of all the created m_process_t for a m_process_t
293 whose PID is equal to \a PID. If no host is found, \c NULL is returned.
294 Note that the PID are uniq in the whole simulation, not only on a given host.
296 m_process_t MSG_process_from_PID(int PID)
298 xbt_fifo_item_t i = NULL;
299 m_process_t process = NULL;
301 xbt_fifo_foreach(msg_global->process_list, i, process, m_process_t) {
302 if (MSG_process_get_PID(process) == PID)
308 /** \ingroup m_process_management
309 * \brief Returns the process ID of \a process.
311 * This function checks whether \a process is a valid pointer or not
312 and return its PID (or 0 in case of problem).
314 int MSG_process_get_PID(m_process_t process)
316 /* Do not raise an exception here: this function is used in the logs,
317 and it will be called back by the exception handling stuff */
318 if (process == NULL || process->simdata == NULL)
321 return (((simdata_process_t) process->simdata)->PID);
324 /** \ingroup m_process_management
325 * \brief Returns the process ID of the parent of \a process.
327 * This function checks whether \a process is a valid pointer or not
328 and return its PID. Returns -1 if the agent has not been created by
331 int MSG_process_get_PPID(m_process_t process)
333 xbt_assert0(((process != NULL)
334 && (process->simdata)), "Invalid parameters");
336 return (((simdata_process_t) process->simdata)->PPID);
339 /** \ingroup m_process_management
340 * \brief Return the name of an agent.
342 * This function checks whether \a process is a valid pointer or not
345 const char *MSG_process_get_name(m_process_t process)
347 xbt_assert0(process, "Invalid parameter: process is NULL");
348 xbt_assert0(process->simdata,
349 "Invalid parameter: process->simdata is NULL");
351 return (process->name);
354 /** \ingroup m_process_management
355 * \brief Returns the value of a given process property
357 * \param process a process
358 * \param name a property name
359 * \return value of a property (or NULL if the property is not set)
361 const char *MSG_process_get_property_value(m_process_t process,
364 return xbt_dict_get_or_null(MSG_process_get_properties(process), name);
367 /** \ingroup m_process_management
368 * \brief Return the list of properties
370 * This function returns all the parameters associated with a process
372 xbt_dict_t MSG_process_get_properties(m_process_t process)
374 xbt_assert0((process != NULL), "Invalid parameters");
376 return (SIMIX_process_get_properties
377 (((simdata_process_t) process->simdata)->s_process));
381 /** \ingroup m_process_management
382 * \brief Return the PID of the current agent.
384 * This function returns the PID of the currently running #m_process_t.
386 int MSG_process_self_PID(void)
388 return (MSG_process_get_PID(MSG_process_self()));
391 /** \ingroup m_process_management
392 * \brief Return the PPID of the current agent.
394 * This function returns the PID of the parent of the currently
395 * running #m_process_t.
397 int MSG_process_self_PPID(void)
399 return (MSG_process_get_PPID(MSG_process_self()));
402 /** \ingroup m_process_management
403 * \brief Return the current agent.
405 * This function returns the currently running #m_process_t.
407 m_process_t MSG_process_self(void)
409 smx_process_t proc = SIMIX_process_self();
411 return (m_process_t) proc->data;
418 /** \ingroup m_process_management
419 * \brief Suspend the process.
421 * This function suspends the process by suspending the task on which
422 * it was waiting for the completion.
424 MSG_error_t MSG_process_suspend(m_process_t process)
426 xbt_assert0(((process != NULL)
427 && (process->simdata)), "Invalid parameters");
431 TRACE_msg_process_suspend (process);
434 SIMIX_process_suspend(process->simdata->s_process);
438 /** \ingroup m_process_management
439 * \brief Resume a suspended process.
441 * This function resumes a suspended process by resuming the task on
442 * which it was waiting for the completion.
444 MSG_error_t MSG_process_resume(m_process_t process)
447 xbt_assert0(((process != NULL)
448 && (process->simdata)), "Invalid parameters");
452 TRACE_msg_process_resume (process);
455 SIMIX_process_resume(process->simdata->s_process);
459 /** \ingroup m_process_management
460 * \brief Returns true if the process is suspended .
462 * This checks whether a process is suspended or not by inspecting the
463 * task on which it was waiting for the completion.
465 int MSG_process_is_suspended(m_process_t process)
467 xbt_assert0(((process != NULL)
468 && (process->simdata)), "Invalid parameters");
469 return SIMIX_process_is_suspended(process->simdata->s_process);