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. */
10 #include "xbt/error.h"
11 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(task, msg,
12 "Logging specific to MSG (task)");
14 static char sprint_buffer[64];
16 /** \defgroup m_task_management Managing functions of Tasks
17 * \brief This section describes the task structure of MSG
18 * (#m_task_t) and the functions for managing it.
20 * Since most scheduling algorithms rely on a concept of task
21 * that can be either <em>computed</em> locally or
22 * <em>transferred</em> on another processor, it seems to be the
23 * right level of abstraction for our purposes. A <em>task</em>
24 * may then be defined by a <em>computing amount</em>, a
25 * <em>message size</em> and some <em>private data</em>.
28 /********************************* Task **************************************/
29 /** \ingroup m_task_management
30 * \brief Creates a new #m_task_t.
32 * A constructor for #m_task_t taking four arguments and returning the
34 * \param name a name for the object. It is for user-level information
36 * \param compute_duration a value of the processing amount (in Mflop)
37 needed to process this new task. If 0, then it cannot be executed with
38 MSG_task_execute(). This value has to be >=0.
39 * \param message_size a value of the amount of data (in Mb) needed to
40 transfer this new task. If 0, then it cannot be transfered with
41 MSG_task_get() and MSG_task_put(). This value has to be >=0.
42 * \param data a pointer to any data may want to attach to the new
43 object. It is for user-level information and can be NULL. It can
44 be retrieved with the function \ref MSG_task_get_data.
46 * \return The new corresponding object.
48 m_task_t MSG_task_create(const char *name, long double compute_duration,
49 long double message_size, void *data)
51 simdata_task_t simdata = xbt_new0(s_simdata_task_t,1);
52 m_task_t task = xbt_new0(s_m_task_t,1);
55 task->name = xbt_strdup(name);
56 task->simdata = simdata;
60 simdata->sleeping = xbt_dynar_new(sizeof(m_process_t),NULL);
61 simdata->computation_amount = compute_duration;
62 simdata->message_size = message_size;
65 simdata->sender = NULL;
71 /** \ingroup m_task_management
72 * \brief Return the user data of a #m_task_t.
74 * This functions checks whether \a task is a valid pointer or not and return
75 the user data associated to \a task if it is possible.
77 void *MSG_task_get_data(m_task_t task)
79 xbt_assert0((task != NULL), "Invalid parameter");
84 /** \ingroup m_task_management
85 * \brief Return the sender of a #m_task_t.
87 * This functions returns the #m_process_t which sent this task
89 m_process_t MSG_task_get_sender(m_task_t task)
91 xbt_assert0(task, "Invalid parameters");
92 return ((simdata_task_t) task->simdata)->sender;
96 /** \ingroup m_task_management
97 * \brief Destroy a #m_task_t.
99 * Destructor for #m_task_t. Note that you should free user data, if any, \b
100 before calling this function.
102 MSG_error_t MSG_task_destroy(m_task_t task)
104 simdata_task_t simdata = NULL;
105 surf_action_t action = NULL;
108 xbt_assert0((task != NULL), "Invalid parameter");
110 task->simdata->using--;
111 if(task->simdata->using>0) return MSG_OK;
113 xbt_assert0((xbt_dynar_length(task->simdata->sleeping)==0),
114 "Task still used. There is a problem. Cannot destroy it now!");
116 if(task->name) xbt_free(task->name);
118 xbt_dynar_free(&(task->simdata->sleeping));
120 action = task->simdata->compute;
121 if(action) action->resource_type->common_public->action_free(action);
122 action = task->simdata->comm;
123 if(action) action->resource_type->common_public->action_free(action);
126 xbt_free(task->simdata);
132 /* static MSG_error_t __MSG_task_check(m_task_t task) */
134 /* simdata_task_t simdata = NULL; */
135 /* int warning = 0; */
137 /* if (task == NULL) { /\* Fatal *\/ */
138 /* WARNING("Task uninitialized"); */
139 /* return MSG_FATAL; */
141 /* simdata = task->simdata; */
143 /* if (simdata == NULL) { /\* Fatal *\/ */
144 /* WARNING("Simulator Data uninitialized"); */
145 /* return MSG_FATAL; */
148 /* if (simdata->compute == NULL) { /\* Fatal if execute ... *\/ */
149 /* WARNING("No duration set for this task"); */
153 /* if (simdata->message_size == 0) { /\* Fatal if transfered ... *\/ */
154 /* WARNING("No message_size set for this task"); */
158 /* /\* if (task->data == NULL) { *\/ */
159 /* /\* WARNING("User Data uninitialized"); *\/ */
160 /* /\* warning++; *\/ */
164 /* return MSG_WARNING; */
168 /* static m_task_t __MSG_task_copy(m_task_t src) */
170 /* m_task_t copy = NULL; */
171 /* simdata_task_t simdata = NULL; */
173 /* __MSG_task_check(src); */
175 /* simdata = src->simdata; */
176 /* copy = MSG_task_create(src->name, SG_getTaskCost(simdata->compute), */
177 /* simdata->message_size, MSG_task_get_data(src)); */
182 MSG_error_t __MSG_task_wait_event(m_process_t process, m_task_t task)
185 m_process_t proc = NULL;
187 xbt_assert0(((task != NULL)
188 && (task->simdata != NULL)), "Invalid parameters");
190 xbt_dynar_push(task->simdata->sleeping, &process);
191 process->simdata->waiting_task = task;
193 process->simdata->waiting_task = NULL;
194 xbt_dynar_foreach(task->simdata->sleeping,_cursor,proc) {
196 xbt_dynar_remove_at(task->simdata->sleeping,_cursor,&proc);