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"
14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_process, msg, "Logging specific to MSG (process)");
16 /** \defgroup m_process_management Management Functions of Agents
17 * \brief This section describes the agent structure of MSG
18 * (#m_process_t) and the functions for managing it.
20 /** @addtogroup m_process_management
21 * \htmlonly <!-- DOXYGEN_NAVBAR_LABEL="Agents" --> \endhtmlonly
23 * We need to simulate many independent scheduling decisions, so
24 * the concept of <em>process</em> is at the heart of the
25 * simulator. A process may be defined as a <em>code</em>, with
26 * some <em>private data</em>, executing in a <em>location</em>.
30 /******************************** Process ************************************/
31 /** \ingroup m_process_management
32 * \brief Creates and runs a new #m_process_t.
34 * Does exactly the same as #MSG_process_create_with_arguments but without
35 providing standard arguments (\a argc, \a argv, \a start_time, \a kill_time).
36 * \sa MSG_process_create_with_arguments
38 m_process_t MSG_process_create(const char *name,
39 xbt_main_func_t code, void *data,
42 return MSG_process_create_with_arguments(name, code, data, host, -1, NULL);
45 void __MSG_process_cleanup(void *arg)
47 /* arg is a pointer to a simix process, we can get the msg process with the field data */
48 m_process_t proc = ((smx_process_t)arg)->data;
49 xbt_fifo_remove(msg_global->process_list, proc);
50 SIMIX_process_cleanup(arg);
60 /* This function creates a MSG process. It has the prototype by SIMIX_function_register_process_create */
61 void *_MSG_process_create_from_SIMIX(const char *name,
62 xbt_main_func_t code, void *data,
63 char * hostname, int argc, char **argv)
65 m_host_t host = MSG_get_host_by_name(hostname);
66 return (void*)MSG_process_create_with_arguments(name,code,data,host,argc,argv);
70 /** \ingroup m_process_management
71 * \brief Creates and runs a new #m_process_t.
73 * A constructor for #m_process_t taking four arguments and returning the
74 * corresponding object. The structure (and the corresponding thread) is
75 * created, and put in the list of ready process.
76 * \param name a name for the object. It is for user-level information
78 * \param code is a function describing the behavior of the agent. It
79 should then only use functions described in \ref
80 m_process_management (to create a new #m_process_t for example),
81 in \ref m_host_management (only the read-only functions i.e. whose
82 name contains the word get), in \ref m_task_management (to create
83 or destroy some #m_task_t for example) and in \ref
84 msg_gos_functions (to handle file transfers and task processing).
85 * \param data a pointer to any data one may want to attach to the new
86 object. It is for user-level information and can be NULL. It can
87 be retrieved with the function \ref MSG_process_get_data.
88 * \param host the location where the new agent is executed.
89 * \param argc first argument passed to \a code
90 * \param argv second argument passed to \a code
92 * \return The new corresponding object.
95 m_process_t MSG_process_create_with_arguments(const char *name,
96 xbt_main_func_t code, void *data,
97 m_host_t host, int argc, char **argv)
99 simdata_process_t simdata = xbt_new0(s_simdata_process_t,1);
100 m_process_t process = xbt_new0(s_m_process_t,1);
101 xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
104 simdata->PID = msg_global->PID++;
105 simdata->waiting_task = NULL;
106 simdata->m_host = host;
107 simdata->argc = argc;
108 simdata->argv = argv;
109 simdata->s_process = SIMIX_process_create(name, code,
110 (void*)process, host->name, argc, argv,
111 __MSG_process_cleanup );
113 if (SIMIX_process_self()) {
114 simdata->PPID = MSG_process_get_PID(SIMIX_process_self()->data);
118 simdata->last_errno=MSG_OK;
121 /* Process structure */
122 process->name = xbt_strdup(name);
123 process->simdata = simdata;
124 process->data = data;
126 xbt_fifo_unshift(msg_global->process_list, process);
132 void _MSG_process_kill_from_SIMIX(void *p) {
133 MSG_process_kill((m_process_t)p);
136 /** \ingroup m_process_management
137 * \param process poor victim
139 * This function simply kills a \a process... scarry isn't it ? :)
141 void MSG_process_kill(m_process_t process)
143 simdata_process_t p_simdata = process->simdata;
145 DEBUG3("Killing %s(%d) on %s",
146 process->name, p_simdata->PID, p_simdata->m_host->name);
148 if(p_simdata->waiting_task) {
149 DEBUG1("Canceling waiting task %s",p_simdata->waiting_task->name);
150 if(p_simdata->waiting_task->simdata->compute) {
151 SIMIX_action_cancel(p_simdata->waiting_task->simdata->compute);
152 } else if (p_simdata->waiting_task->simdata->comm) {
153 SIMIX_action_cancel(p_simdata->waiting_task->simdata->comm);
157 xbt_fifo_remove(msg_global->process_list,process);
158 SIMIX_process_kill(process->simdata->s_process);
163 /** \ingroup m_process_management
164 * \brief Migrates an agent to another location.
166 * This functions checks whether \a process and \a host are valid pointers
167 and change the value of the #m_host_t on which \a process is running.
169 MSG_error_t MSG_process_change_host(m_process_t process, m_host_t host)
171 xbt_die("MSG_process_change_host - not implemented yet - maybe useless function");
175 /** \ingroup m_process_management
176 * \brief Return the user data of a #m_process_t.
178 * This functions checks whether \a process is a valid pointer or not
179 and return the user data associated to \a process if it is possible.
181 void *MSG_process_get_data(m_process_t process)
183 xbt_assert0((process != NULL), "Invalid parameters");
185 return (process->data);
188 /** \ingroup m_process_management
189 * \brief Set the user data of a #m_process_t.
191 * This functions checks whether \a process is a valid pointer or not
192 and set the user data associated to \a process if it is possible.
194 MSG_error_t MSG_process_set_data(m_process_t process,void *data)
196 xbt_assert0((process != NULL), "Invalid parameters");
197 xbt_assert0((process->data == NULL), "Data already set");
199 process->data = data;
204 /** \ingroup m_process_management
205 * \brief Return the location on which an agent is running.
207 * This functions checks whether \a process is a valid pointer or not
208 and return the m_host_t corresponding to the location on which \a
211 m_host_t MSG_process_get_host(m_process_t process)
213 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
215 return (((simdata_process_t) process->simdata)->m_host);
218 /** \ingroup m_process_management
220 * \brief Return a #m_process_t given its PID.
222 * This functions search in the list of all the created m_process_t for a m_process_t
223 whose PID is equal to \a PID. If no host is found, \c NULL is returned.
224 Note that the PID are uniq in the whole simulation, not only on a given host.
226 m_process_t MSG_process_from_PID(int PID)
228 xbt_fifo_item_t i = NULL;
229 m_process_t process = NULL;
231 xbt_fifo_foreach(msg_global->process_list,i,process,m_process_t) {
232 if(MSG_process_get_PID(process) == PID) return process;
237 /** \ingroup m_process_management
238 * \brief Returns the process ID of \a process.
240 * This functions checks whether \a process is a valid pointer or not
241 and return its PID (or 0 in case of problem).
243 int MSG_process_get_PID(m_process_t process)
245 /* Do not raise an exception here: this function is used in the logs,
246 and it will be called back by the exception handling stuff */
247 if (process == NULL || process->simdata == NULL)
250 return (((simdata_process_t) process->simdata)->PID);
253 /** \ingroup m_process_management
254 * \brief Returns the process ID of the parent of \a process.
256 * This functions checks whether \a process is a valid pointer or not
257 and return its PID. Returns -1 if the agent has not been created by
260 int MSG_process_get_PPID(m_process_t process)
262 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
264 return (((simdata_process_t) process->simdata)->PPID);
267 /** \ingroup m_process_management
268 * \brief Return the name of an agent.
270 * This functions checks whether \a process is a valid pointer or not
273 const char *MSG_process_get_name(m_process_t process)
275 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
277 return (process->name);
280 /** \ingroup m_process_management
281 * \brief Return the PID of the current agent.
283 * This functions returns the PID of the currently running #m_process_t.
285 int MSG_process_self_PID(void)
287 return (MSG_process_get_PID(MSG_process_self()));
290 /** \ingroup m_process_management
291 * \brief Return the PPID of the current agent.
293 * This functions returns the PID of the parent of the currently
294 * running #m_process_t.
296 int MSG_process_self_PPID(void)
298 return (MSG_process_get_PPID(MSG_process_self()));
301 /** \ingroup m_process_management
302 * \brief Return the current agent.
304 * This functions returns the currently running #m_process_t.
306 m_process_t MSG_process_self(void)
308 smx_process_t proc = SIMIX_process_self();
310 return (m_process_t)proc->data;
318 /** \ingroup m_process_management
319 * \brief Suspend the process.
321 * This functions suspend the process by suspending the task on which
322 * it was waiting for the completion.
324 MSG_error_t MSG_process_suspend(m_process_t process)
326 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
329 SIMIX_process_suspend(process->simdata->s_process);
333 /** \ingroup m_process_management
334 * \brief Resume a suspended process.
336 * This functions resume a suspended process by resuming the task on
337 * which it was waiting for the completion.
339 MSG_error_t MSG_process_resume(m_process_t process)
342 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
345 SIMIX_process_resume(process->simdata->s_process);
349 /** \ingroup m_process_management
350 * \brief Returns true if the process is suspended .
352 * This checks whether a process is suspended or not by inspecting the
353 * task on which it was waiting for the completion.
355 int MSG_process_is_suspended(m_process_t process)
357 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
358 return SIMIX_process_is_suspended(process->simdata->s_process);