3 /* Copyright (c) 2002-2007 Arnaud Legrand. */
4 /* Copyright (c) 2007 Bruno Donassolo. */
5 /* All rights reserved. */
7 /* This program is free software; you can redistribute it and/or modify it
8 * under the terms of the license (GNU LGPL) which comes with this package. */
10 #include "msg/private.h"
11 #include "xbt/sysdep.h"
13 #include "../simix/private.h"
15 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_process, msg,
16 "Logging specific to MSG (process)");
18 /** \defgroup m_process_management Management Functions of Agents
19 * \brief This section describes the agent structure of MSG
20 * (#m_process_t) and the functions for managing it.
22 /** @addtogroup m_process_management
23 * \htmlonly <!-- DOXYGEN_NAVBAR_LABEL="Agents" --> \endhtmlonly
25 * We need to simulate many independent scheduling decisions, so
26 * the concept of <em>process</em> is at the heart of the
27 * simulator. A process may be defined as a <em>code</em>, with
28 * some <em>private data</em>, executing in a <em>location</em>.
32 /******************************** Process ************************************/
33 void __MSG_process_cleanup(void *arg)
35 /* arg is a pointer to a simix process, we can get the msg process with the field data */
36 m_process_t proc = ((smx_process_t) arg)->data;
37 xbt_fifo_remove(msg_global->process_list, proc);
38 SIMIX_process_cleanup(arg);
48 /* This function creates a MSG process. It has the prototype enforced by SIMIX_function_register_process_create */
49 void *_MSG_process_create_from_SIMIX(const char *name,
50 xbt_main_func_t code, void *data,
51 char *hostname, int argc, char **argv,
52 xbt_dict_t properties)
54 m_host_t host = MSG_get_host_by_name(hostname);
55 return (void *) MSG_process_create_with_environment(name, code, data, host,
56 argc, argv, properties);
59 /** \ingroup m_process_management
60 * \brief Creates and runs a new #m_process_t.
62 * Does exactly the same as #MSG_process_create_with_arguments but without
63 providing standard arguments (\a argc, \a argv, \a start_time, \a kill_time).
64 * \sa MSG_process_create_with_arguments
66 m_process_t MSG_process_create(const char *name,
67 xbt_main_func_t code, void *data,
70 return MSG_process_create_with_environment(name, code, data, host, -1,
74 /** \ingroup m_process_management
75 * \brief Creates and runs a new #m_process_t.
77 * A constructor for #m_process_t taking four arguments and returning the
78 * corresponding object. The structure (and the corresponding thread) is
79 * created, and put in the list of ready process.
80 * \param name a name for the object. It is for user-level information
82 * \param code is a function describing the behavior of the agent. It
83 should then only use functions described in \ref
84 m_process_management (to create a new #m_process_t for example),
85 in \ref m_host_management (only the read-only functions i.e. whose
86 name contains the word get), in \ref m_task_management (to create
87 or destroy some #m_task_t for example) and in \ref
88 msg_gos_functions (to handle file transfers and task processing).
89 * \param data a pointer to any data one may want to attach to the new
90 object. It is for user-level information and can be NULL. It can
91 be retrieved with the function \ref MSG_process_get_data.
92 * \param host the location where the new agent is executed.
93 * \param argc first argument passed to \a code
94 * \param argv second argument passed to \a code
96 * \return The new corresponding object.
99 m_process_t MSG_process_create_with_arguments(const char *name,
100 xbt_main_func_t code,
101 void *data, m_host_t host,
102 int argc, char **argv)
104 return MSG_process_create_with_environment(name, code, data, host,
108 /** \ingroup m_process_management
109 * \brief Creates and runs a new #m_process_t.
111 * A constructor for #m_process_t taking four arguments and returning the
112 * corresponding object. The structure (and the corresponding thread) is
113 * created, and put in the list of ready process.
114 * \param name a name for the object. It is for user-level information
116 * \param code is a function describing the behavior of the agent. It
117 should then only use functions described in \ref
118 m_process_management (to create a new #m_process_t for example),
119 in \ref m_host_management (only the read-only functions i.e. whose
120 name contains the word get), in \ref m_task_management (to create
121 or destroy some #m_task_t for example) and in \ref
122 msg_gos_functions (to handle file transfers and task processing).
123 * \param data a pointer to any data one may want to attach to the new
124 object. It is for user-level information and can be NULL. It can
125 be retrieved with the function \ref MSG_process_get_data.
126 * \param host the location where the new agent is executed.
127 * \param argc first argument passed to \a code
128 * \param argv second argument passed to \a code
129 * \param properties list a properties defined for this process
131 * \return The new corresponding object.
133 m_process_t MSG_process_create_with_environment(const char *name,
134 xbt_main_func_t code,
135 void *data, m_host_t host,
136 int argc, char **argv,
137 xbt_dict_t properties)
139 simdata_process_t simdata = NULL;
140 m_process_t process = xbt_new0(s_m_process_t, 1);
141 smx_process_t smx_process = NULL;
142 xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
144 smx_process = SIMIX_process_create(name, code,
145 (void *) process, host->name,
146 argc, argv, properties);
152 simdata = xbt_new0(s_simdata_process_t, 1);
155 simdata->PID = msg_global->PID++;
156 simdata->waiting_action = NULL;
157 simdata->m_host = host;
158 simdata->argc = argc;
159 simdata->argv = argv;
160 simdata->s_process = smx_process;
162 if (SIMIX_process_self()) {
163 simdata->PPID = MSG_process_get_PID(SIMIX_process_self()->data);
167 simdata->last_errno = MSG_OK;
170 /* Process structure */
171 process->name = xbt_strdup(name);
172 process->simdata = simdata;
173 process->data = data;
175 xbt_fifo_unshift(msg_global->process_list, process);
181 void _MSG_process_kill_from_SIMIX(void *p)
183 MSG_process_kill((m_process_t) p);
186 /** \ingroup m_process_management
187 * \param process poor victim
189 * This function simply kills a \a process... scarry isn't it ? :)
191 void MSG_process_kill(m_process_t process)
193 simdata_process_t p_simdata = process->simdata;
195 DEBUG3("Killing %s(%d) on %s",
196 process->name, p_simdata->PID, p_simdata->m_host->name);
198 if (p_simdata->waiting_action) {
199 DEBUG1("Canceling waiting task %s",
200 SIMIX_action_get_name(p_simdata->waiting_action));
201 SIMIX_action_cancel(p_simdata->waiting_action);
204 xbt_fifo_remove(msg_global->process_list, process);
205 SIMIX_process_kill(process->simdata->s_process);
210 /** \ingroup m_process_management
211 * \brief Migrates an agent to another location.
213 * This function checks whether \a process and \a host are valid pointers
214 and change the value of the #m_host_t on which \a process is running.
216 MSG_error_t MSG_process_change_host(m_host_t host)
218 m_process_t process = MSG_process_self();
219 m_host_t now = process->simdata->m_host;
220 process->simdata->m_host = host;
221 SIMIX_process_change_host(process->simdata->s_process, now->name,
226 /** \ingroup m_process_management
227 * \brief Return the user data of a #m_process_t.
229 * This function checks whether \a process is a valid pointer or not
230 and return the user data associated to \a process if it is possible.
232 void *MSG_process_get_data(m_process_t process)
234 xbt_assert0((process != NULL), "Invalid parameters");
236 return (process->data);
239 /** \ingroup m_process_management
240 * \brief Set the user data of a #m_process_t.
242 * This function checks whether \a process is a valid pointer or not
243 and set the user data associated to \a process if it is possible.
245 MSG_error_t MSG_process_set_data(m_process_t process, void *data)
247 xbt_assert0((process != NULL), "Invalid parameters");
248 xbt_assert0((process->data == NULL), "Data already set");
250 process->data = data;
255 /** \ingroup m_process_management
256 * \brief Return the location on which an agent is running.
258 * This function checks whether \a process is a valid pointer or not
259 and return the m_host_t corresponding to the location on which \a
262 m_host_t MSG_process_get_host(m_process_t process)
264 xbt_assert0(((process != NULL)
265 && (process->simdata)), "Invalid parameters");
267 return (((simdata_process_t) process->simdata)->m_host);
270 /** \ingroup m_process_management
272 * \brief Return a #m_process_t given its PID.
274 * This function search in the list of all the created m_process_t for a m_process_t
275 whose PID is equal to \a PID. If no host is found, \c NULL is returned.
276 Note that the PID are uniq in the whole simulation, not only on a given host.
278 m_process_t MSG_process_from_PID(int PID)
280 xbt_fifo_item_t i = NULL;
281 m_process_t process = NULL;
283 xbt_fifo_foreach(msg_global->process_list, i, process, m_process_t) {
284 if (MSG_process_get_PID(process) == PID)
290 /** \ingroup m_process_management
291 * \brief Returns the process ID of \a process.
293 * This function checks whether \a process is a valid pointer or not
294 and return its PID (or 0 in case of problem).
296 int MSG_process_get_PID(m_process_t process)
298 /* Do not raise an exception here: this function is used in the logs,
299 and it will be called back by the exception handling stuff */
300 if (process == NULL || process->simdata == NULL)
303 return (((simdata_process_t) process->simdata)->PID);
306 /** \ingroup m_process_management
307 * \brief Returns the process ID of the parent of \a process.
309 * This function checks whether \a process is a valid pointer or not
310 and return its PID. Returns -1 if the agent has not been created by
313 int MSG_process_get_PPID(m_process_t process)
315 xbt_assert0(((process != NULL)
316 && (process->simdata)), "Invalid parameters");
318 return (((simdata_process_t) process->simdata)->PPID);
321 /** \ingroup m_process_management
322 * \brief Return the name of an agent.
324 * This function checks whether \a process is a valid pointer or not
327 const char *MSG_process_get_name(m_process_t process)
329 xbt_assert0(process, "Invalid parameter: process is NULL");
330 xbt_assert0(process->simdata,
331 "Invalid parameter: process->simdata is NULL");
333 return (process->name);
336 /** \ingroup m_process_management
337 * \brief Returns the value of a given process property
339 * \param process a process
340 * \param name a property name
341 * \return value of a property (or NULL if the property is not set)
343 const char *MSG_process_get_property_value(m_process_t process,
346 return xbt_dict_get_or_null(MSG_process_get_properties(process), name);
349 /** \ingroup m_process_management
350 * \brief Return the list of properties
352 * This function returns all the parameters associated with a process
354 xbt_dict_t MSG_process_get_properties(m_process_t process)
356 xbt_assert0((process != NULL), "Invalid parameters");
358 return (SIMIX_process_get_properties
359 (((simdata_process_t) process->simdata)->s_process));
363 /** \ingroup m_process_management
364 * \brief Return the PID of the current agent.
366 * This function returns the PID of the currently running #m_process_t.
368 int MSG_process_self_PID(void)
370 return (MSG_process_get_PID(MSG_process_self()));
373 /** \ingroup m_process_management
374 * \brief Return the PPID of the current agent.
376 * This function returns the PID of the parent of the currently
377 * running #m_process_t.
379 int MSG_process_self_PPID(void)
381 return (MSG_process_get_PPID(MSG_process_self()));
384 /** \ingroup m_process_management
385 * \brief Return the current agent.
387 * This function returns the currently running #m_process_t.
389 m_process_t MSG_process_self(void)
391 smx_process_t proc = SIMIX_process_self();
393 return (m_process_t) proc->data;
400 /** \ingroup m_process_management
401 * \brief Suspend the process.
403 * This function suspends the process by suspending the task on which
404 * it was waiting for the completion.
406 MSG_error_t MSG_process_suspend(m_process_t process)
408 xbt_assert0(((process != NULL)
409 && (process->simdata)), "Invalid parameters");
412 SIMIX_process_suspend(process->simdata->s_process);
416 /** \ingroup m_process_management
417 * \brief Resume a suspended process.
419 * This function resumes a suspended process by resuming the task on
420 * which it was waiting for the completion.
422 MSG_error_t MSG_process_resume(m_process_t process)
425 xbt_assert0(((process != NULL)
426 && (process->simdata)), "Invalid parameters");
429 SIMIX_process_resume(process->simdata->s_process);
433 /** \ingroup m_process_management
434 * \brief Returns true if the process is suspended .
436 * This checks whether a process is suspended or not by inspecting the
437 * task on which it was waiting for the completion.
439 int MSG_process_is_suspended(m_process_t process)
441 xbt_assert0(((process != NULL)
442 && (process->simdata)), "Invalid parameters");
443 return SIMIX_process_is_suspended(process->simdata->s_process);