3 /* Copyright (c) 2002,2003,2004 Arnaud Legrand. All rights reserved. */
5 /* This program is free software; you can redistribute it and/or modify it
6 * under the terms of the license (GNU LGPL) which comes with this package. */
9 #include "xbt/sysdep.h"
11 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(task, msg,
12 "Logging specific to MSG (task)");
14 /** \defgroup m_task_management Managing functions of Tasks
15 * \brief This section describes the task structure of MSG
16 * (#m_task_t) and the functions for managing it.
18 * Since most scheduling algorithms rely on a concept of task
19 * that can be either <em>computed</em> locally or
20 * <em>transferred</em> on another processor, it seems to be the
21 * right level of abstraction for our purposes. A <em>task</em>
22 * may then be defined by a <em>computing amount</em>, a
23 * <em>message size</em> and some <em>private data</em>.
26 /********************************* Task **************************************/
27 /** \ingroup m_task_management
28 * \brief Creates a new #m_task_t.
30 * A constructor for #m_task_t taking four arguments and returning the
32 * \param name a name for the object. It is for user-level information
34 * \param compute_duration a value of the processing amount (in Mflop)
35 needed to process this new task. If 0, then it cannot be executed with
36 MSG_task_execute(). This value has to be >=0.
37 * \param message_size a value of the amount of data (in Mb) needed to
38 transfer this new task. If 0, then it cannot be transfered with
39 MSG_task_get() and MSG_task_put(). This value has to be >=0.
40 * \param data a pointer to any data may want to attach to the new
41 object. It is for user-level information and can be NULL. It can
42 be retrieved with the function \ref MSG_task_get_data.
44 * \return The new corresponding object.
46 m_task_t MSG_task_create(const char *name, double compute_duration,
47 double message_size, void *data)
49 simdata_task_t simdata = xbt_new0(s_simdata_task_t,1);
50 m_task_t task = xbt_new0(s_m_task_t,1);
53 task->name = xbt_strdup(name);
54 task->simdata = simdata;
58 simdata->sleeping = xbt_dynar_new(sizeof(m_process_t),NULL);
59 simdata->computation_amount = compute_duration;
60 simdata->message_size = message_size;
63 simdata->sender = NULL;
68 /** \ingroup m_task_management
69 * \brief Return the user data of a #m_task_t.
71 * This functions checks whether \a task is a valid pointer or not and return
72 the user data associated to \a task if it is possible.
74 void *MSG_task_get_data(m_task_t task)
76 xbt_assert0((task != NULL), "Invalid parameter");
81 /** \ingroup m_task_management
82 * \brief Return the sender of a #m_task_t.
84 * This functions returns the #m_process_t which sent this task
86 m_process_t MSG_task_get_sender(m_task_t task)
88 xbt_assert0(task, "Invalid parameters");
89 return ((simdata_task_t) task->simdata)->sender;
92 /** \ingroup m_task_management
93 * \brief Return the name of a #m_task_t.
95 * This functions returns the name of a #m_task_t as specified on creation
97 const char *MSG_task_get_name(m_task_t task)
99 xbt_assert0(task, "Invalid parameters");
104 /** \ingroup m_task_management
105 * \brief Destroy a #m_task_t.
107 * Destructor for #m_task_t. Note that you should free user data, if any, \b
108 before calling this function.
110 MSG_error_t MSG_task_destroy(m_task_t task)
112 surf_action_t action = NULL;
114 xbt_assert0((task != NULL), "Invalid parameter");
116 task->simdata->using--;
117 if(task->simdata->using>0) return MSG_OK;
119 xbt_assert0((xbt_dynar_length(task->simdata->sleeping)==0),
120 "Task still used. There is a problem. Cannot destroy it now!");
122 if(task->name) free(task->name);
124 xbt_dynar_free(&(task->simdata->sleeping));
126 action = task->simdata->compute;
127 if(action) action->resource_type->common_public->action_free(action);
128 action = task->simdata->comm;
129 if(action) action->resource_type->common_public->action_free(action);
130 if(task->simdata->host_list) xbt_free(task->simdata->host_list);
139 /** \ingroup m_task_management
140 * \brief Cancel a #m_task_t.
141 * \param task the taskt to cancel. If it was executed or transfered, it
142 stops the process that were working on it.
144 MSG_error_t MSG_task_cancel(m_task_t task)
146 xbt_assert0((task != NULL), "Invalid parameter");
148 if(task->simdata->compute) {
149 surf_workstation_resource->common_public->action_cancel(task->simdata->compute);
152 if(task->simdata->comm) {
153 surf_workstation_resource->common_public->action_cancel(task->simdata->comm);
160 /** \ingroup m_task_management
161 * \brief Returns the computation amount needed to process a task #m_task_t.
162 * Once a task has been processed, this amount is thus set to 0...
164 double MSG_task_get_compute_duration(m_task_t task) {
165 xbt_assert0((task != NULL) && (task->simdata != NULL), "Invalid parameter");
167 return task->simdata->computation_amount;
170 /** \ingroup m_task_management
171 * \brief Returns the remaining computation amount of a task #m_task_t.
174 double MSG_task_get_remaining_computation(m_task_t task)
176 xbt_assert0((task != NULL) && (task->simdata != NULL), "Invalid parameter");
178 if(task->simdata->compute) {
179 return task->simdata->compute->remains;
181 return task->simdata->computation_amount;
185 /** \ingroup m_task_management
186 * \brief Returns the size of the data attached to a task #m_task_t.
189 double MSG_task_get_data_size(m_task_t task) {
190 xbt_assert0((task != NULL) && (task->simdata != NULL), "Invalid parameter");
192 return task->simdata->message_size;
195 /* static MSG_error_t __MSG_task_check(m_task_t task) */
197 /* simdata_task_t simdata = NULL; */
198 /* int warning = 0; */
200 /* if (task == NULL) { /\* Fatal *\/ */
201 /* WARNING("Task uninitialized"); */
202 /* return MSG_FATAL; */
204 /* simdata = task->simdata; */
206 /* if (simdata == NULL) { /\* Fatal *\/ */
207 /* WARNING("Simulator Data uninitialized"); */
208 /* return MSG_FATAL; */
211 /* if (simdata->compute == NULL) { /\* Fatal if execute ... *\/ */
212 /* WARNING("No duration set for this task"); */
216 /* if (simdata->message_size == 0) { /\* Fatal if transfered ... *\/ */
217 /* WARNING("No message_size set for this task"); */
221 /* /\* if (task->data == NULL) { *\/ */
222 /* /\* WARNING("User Data uninitialized"); *\/ */
223 /* /\* warning++; *\/ */
227 /* return MSG_WARNING; */
231 /* static m_task_t __MSG_task_copy(m_task_t src) */
233 /* m_task_t copy = NULL; */
234 /* simdata_task_t simdata = NULL; */
236 /* __MSG_task_check(src); */
238 /* simdata = src->simdata; */
239 /* copy = MSG_task_create(src->name, SG_getTaskCost(simdata->compute), */
240 /* simdata->message_size, MSG_task_get_data(src)); */
245 MSG_error_t __MSG_task_wait_event(m_process_t process, m_task_t task)
248 m_process_t proc = NULL;
250 xbt_assert0(((task != NULL)
251 && (task->simdata != NULL)), "Invalid parameters");
253 xbt_dynar_push(task->simdata->sleeping, &process);
254 process->simdata->waiting_task = task;
256 process->simdata->waiting_task = NULL;
257 xbt_dynar_foreach(task->simdata->sleeping,_cursor,proc) {
259 xbt_dynar_remove_at(task->simdata->sleeping,_cursor,&proc);