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.
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 /** \ingroup m_process_management
30 * \brief Creates and runs a new #m_process_t.
32 * Does exactly the same as #MSG_process_create_with_arguments but without
33 providing standard arguments (\a argc, \a argv, \a start_time, \a kill_time).
34 * \sa MSG_process_create_with_arguments
36 m_process_t MSG_process_create(const char *name,
37 m_process_code_t code, void *data,
40 return MSG_process_create_with_arguments(name, code, data, host, -1, NULL);
43 static void MSG_process_cleanup(void *arg)
45 /* arg is a pointer to a simix process, we can get the msg process with the field data */
46 m_process_t proc = ((smx_process_t)arg)->data;
47 xbt_fifo_remove(msg_global->process_list, proc);
48 SIMIX_process_cleanup(arg);
58 /** \ingroup m_process_management
59 * \brief Creates and runs a new #m_process_t.
61 * A constructor for #m_process_t taking four arguments and returning the
62 * corresponding object. The structure (and the corresponding thread) is
63 * created, and put in the list of ready process.
64 * \param name a name for the object. It is for user-level information
66 * \param code is a function describing the behavior of the agent. It
67 should then only use functions described in \ref
68 m_process_management (to create a new #m_process_t for example),
69 in \ref m_host_management (only the read-only functions i.e. whose
70 name contains the word get), in \ref m_task_management (to create
71 or destroy some #m_task_t for example) and in \ref
72 msg_gos_functions (to handle file transfers and task processing).
73 * \param data a pointer to any data one may want to attach to the new
74 object. It is for user-level information and can be NULL. It can
75 be retrieved with the function \ref MSG_process_get_data.
76 * \param host the location where the new agent is executed.
77 * \param argc first argument passed to \a code
78 * \param argv second argument passed to \a code
80 * \return The new corresponding object.
85 m_process_t __MSG_process_create_with_arguments(const char *name,
86 m_process_code_t code, void *data,
87 char * hostname, int argc, char **argv)
89 m_host_t host = MSG_get_host_by_name(hostname);
90 return MSG_process_create_with_arguments(name,code,data,host,argc,argv);
93 m_process_t MSG_process_create_with_arguments(const char *name,
94 m_process_code_t code, void *data,
95 m_host_t host, int argc, char **argv)
97 simdata_process_t simdata = xbt_new0(s_simdata_process_t,1);
98 m_process_t process = xbt_new0(s_m_process_t,1);
99 xbt_assert0(((code != NULL) && (host != NULL)), "Invalid parameters");
102 simdata->PID = msg_global->PID++;
103 simdata->waiting_task = NULL;
104 simdata->host = host;
105 simdata->argc = argc;
106 simdata->argv = argv;
107 simdata->smx_process = SIMIX_process_create(name, (smx_process_code_t)code, (void*)process, host->name, argc, argv, MSG_process_cleanup );
109 if (SIMIX_process_self()) {
110 simdata->PPID = MSG_process_get_PID(SIMIX_process_self()->data);
112 else simdata->PPID = -1;
113 simdata->last_errno=MSG_OK;
116 /* Process structure */
117 process->name = xbt_strdup(name);
118 process->simdata = simdata;
119 process->data = data;
121 xbt_fifo_unshift(msg_global->process_list, process);
126 /** \ingroup m_process_management
127 * \param process poor victim
129 * This function simply kills a \a process... scarry isn't it ? :)
131 void MSG_process_kill(m_process_t process)
133 simdata_process_t p_simdata = process->simdata;
135 DEBUG3("Killing %s(%d) on %s",process->name, p_simdata->PID, p_simdata->host->name);
137 if(p_simdata->waiting_task) {
138 DEBUG1("Canceling waiting task %s",p_simdata->waiting_task->name);
139 if(p_simdata->waiting_task->simdata->compute) {
140 SIMIX_action_cancel(p_simdata->waiting_task->simdata->compute);
142 else if (p_simdata->waiting_task->simdata->comm) {
143 SIMIX_action_cancel(p_simdata->waiting_task->simdata->comm);
147 xbt_fifo_remove(msg_global->process_list,process);
148 SIMIX_process_kill(process->simdata->smx_process);
153 /** \ingroup m_process_management
154 * \brief Migrates an agent to another location.
156 * This functions checks whether \a process and \a host are valid pointers
157 and change the value of the #m_host_t on which \a process is running.
159 MSG_error_t MSG_process_change_host(m_process_t process, m_host_t host)
161 xbt_die("MSG_process_change_host - not implemented yet - maybe useless function");
165 /** \ingroup m_process_management
166 * \brief Return the user data of a #m_process_t.
168 * This functions checks whether \a process is a valid pointer or not
169 and return the user data associated to \a process if it is possible.
171 void *MSG_process_get_data(m_process_t process)
173 xbt_assert0((process != NULL), "Invalid parameters");
175 return (process->data);
178 /** \ingroup m_process_management
179 * \brief Set the user data of a #m_process_t.
181 * This functions checks whether \a process is a valid pointer or not
182 and set the user data associated to \a process if it is possible.
184 MSG_error_t MSG_process_set_data(m_process_t process,void *data)
186 xbt_assert0((process != NULL), "Invalid parameters");
187 xbt_assert0((process->data == NULL), "Data already set");
189 process->data = data;
194 /** \ingroup m_process_management
195 * \brief Return the location on which an agent is running.
197 * This functions checks whether \a process is a valid pointer or not
198 and return the m_host_t corresponding to the location on which \a
201 m_host_t MSG_process_get_host(m_process_t process)
203 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
205 return (((simdata_process_t) process->simdata)->host);
208 /** \ingroup m_process_management
210 * \brief Return a #m_process_t given its PID.
212 * This functions search in the list of all the created m_process_t for a m_process_t
213 whose PID is equal to \a PID. If no host is found, \c NULL is returned.
214 Note that the PID are uniq in the whole simulation, not only on a given host.
216 m_process_t MSG_process_from_PID(int PID)
218 xbt_fifo_item_t i = NULL;
219 m_process_t process = NULL;
221 xbt_fifo_foreach(msg_global->process_list,i,process,m_process_t) {
222 if(MSG_process_get_PID(process) == PID) return process;
227 /** \ingroup m_process_management
228 * \brief Returns the process ID of \a process.
230 * This functions checks whether \a process is a valid pointer or not
233 int MSG_process_get_PID(m_process_t process)
235 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
237 return (((simdata_process_t) process->simdata)->PID);
240 /** \ingroup m_process_management
241 * \brief Returns the process ID of the parent of \a process.
243 * This functions checks whether \a process is a valid pointer or not
244 and return its PID. Returns -1 if the agent has not been created by
247 int MSG_process_get_PPID(m_process_t process)
249 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
251 return (((simdata_process_t) process->simdata)->PPID);
254 /** \ingroup m_process_management
255 * \brief Return the name of an agent.
257 * This functions checks whether \a process is a valid pointer or not
260 const char *MSG_process_get_name(m_process_t process)
262 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
264 return (process->name);
267 /** \ingroup m_process_management
268 * \brief Return the PID of the current agent.
270 * This functions returns the PID of the currently running #m_process_t.
272 int MSG_process_self_PID(void)
274 return (MSG_process_get_PID(MSG_process_self()));
277 /** \ingroup m_process_management
278 * \brief Return the PPID of the current agent.
280 * This functions returns the PID of the parent of the currently
281 * running #m_process_t.
283 int MSG_process_self_PPID(void)
285 return (MSG_process_get_PPID(MSG_process_self()));
288 /** \ingroup m_process_management
289 * \brief Return the current agent.
291 * This functions returns the currently running #m_process_t.
293 m_process_t MSG_process_self(void)
295 smx_process_t proc = SIMIX_process_self();
297 return (m_process_t)proc->data;
305 /** \ingroup m_process_management
306 * \brief Suspend the process.
308 * This functions suspend the process by suspending the task on which
309 * it was waiting for the completion.
311 MSG_error_t MSG_process_suspend(m_process_t process)
313 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
316 SIMIX_process_suspend(process->simdata->smx_process);
320 /** \ingroup m_process_management
321 * \brief Resume a suspended process.
323 * This functions resume a suspended process by resuming the task on
324 * which it was waiting for the completion.
326 MSG_error_t MSG_process_resume(m_process_t process)
329 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
332 SIMIX_process_resume(process->simdata->smx_process);
336 /** \ingroup m_process_management
337 * \brief Returns true if the process is suspended .
339 * This checks whether a process is suspended or not by inspecting the
340 * task on which it was waiting for the completion.
342 int MSG_process_is_suspended(m_process_t process)
344 xbt_assert0(((process != NULL) && (process->simdata)), "Invalid parameters");
345 return SIMIX_process_is_suspended(process->simdata->smx_process);