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 /** \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.
17 * \htmlonly <!-- DOXYGEN_NAVBAR_LABEL="Tasks" --> \endhtmlonly
19 * Since most scheduling algorithms rely on a concept of task
20 * that can be either <em>computed</em> locally or
21 * <em>transferred</em> on another processor, it seems to be the
22 * right level of abstraction for our purposes. A <em>task</em>
23 * may then be defined by a <em>computing amount</em>, a
24 * <em>message size</em> and some <em>private data</em>.
27 /********************************* Task **************************************/
28 /** \ingroup m_task_management
29 * \brief Creates a new #m_task_t.
31 * A constructor for #m_task_t taking four arguments and returning the
33 * \param name a name for the object. It is for user-level information
35 * \param compute_duration a value of the processing amount (in flop)
36 needed to process this new task. If 0, then it cannot be executed with
37 MSG_task_execute(). This value has to be >=0.
38 * \param message_size a value of the amount of data (in bytes) needed to
39 transfer this new task. If 0, then it cannot be transfered with
40 MSG_task_get() and MSG_task_put(). This value has to be >=0.
41 * \param data a pointer to any data may want to attach to the new
42 object. It is for user-level information and can be NULL. It can
43 be retrieved with the function \ref MSG_task_get_data.
45 * \return The new corresponding object.
47 m_task_t MSG_task_create(const char *name, double compute_duration,
48 double message_size, void *data)
50 m_task_t task = xbt_new(s_m_task_t,1);
51 simdata_task_t simdata = xbt_new(s_simdata_task_t,1);
52 task->simdata = simdata;
54 task->name = xbt_strdup(name);
58 simdata->computation_amount = compute_duration;
59 simdata->message_size = message_size;
61 simdata->priority = 1.0;
63 simdata->sender = NULL;
64 simdata->receiver = NULL;
65 simdata->cond = SIMIX_cond_init();
66 simdata->mutex = SIMIX_mutex_init();
67 simdata->compute = NULL;
70 simdata->host_list = NULL;
71 simdata->comp_amount = NULL;
72 simdata->comm_amount = NULL;
77 /** \ingroup m_task_management
78 * \brief Return the user data of a #m_task_t.
80 * This functions checks whether \a task is a valid pointer or not and return
81 the user data associated to \a task if it is possible.
83 void *MSG_task_get_data(m_task_t task)
85 xbt_assert0((task != NULL), "Invalid parameter");
90 /** \ingroup m_task_management
91 * \brief Return the sender of a #m_task_t.
93 * This functions returns the #m_process_t which sent this task
95 m_process_t MSG_task_get_sender(m_task_t task)
97 xbt_assert0(task, "Invalid parameters");
98 return ((simdata_task_t) task->simdata)->sender;
101 /** \ingroup m_task_management
102 * \brief Return the source of a #m_task_t.
104 * This functions returns the #m_host_t from which this task was sent
106 m_host_t MSG_task_get_source(m_task_t task)
108 xbt_assert0(task, "Invalid parameters");
109 return ((simdata_task_t) task->simdata)->source;
112 /** \ingroup m_task_management
113 * \brief Return the name of a #m_task_t.
115 * This functions returns the name of a #m_task_t as specified on creation
117 const char *MSG_task_get_name(m_task_t task)
119 xbt_assert0(task, "Invalid parameters");
124 /** \ingroup m_task_management
125 * \brief Destroy a #m_task_t.
127 * Destructor for #m_task_t. Note that you should free user data, if any, \b
128 before calling this function.
130 MSG_error_t MSG_task_destroy(m_task_t task)
132 smx_action_t action = NULL;
133 xbt_assert0((task != NULL), "Invalid parameter");
135 /* why? if somebody is using, then you can't free! ok... but will return MSG_OK? when this task will be destroyed? isn't the user code wrong? */
136 task->simdata->using--;
137 if(task->simdata->using>0) return MSG_OK;
139 if(task->name) free(task->name);
141 SIMIX_cond_destroy(task->simdata->cond);
142 SIMIX_mutex_destroy(task->simdata->mutex);
144 action = task->simdata->compute;
145 if(action) SIMIX_action_destroy(action);
146 action = task->simdata->comm;
147 if(action) SIMIX_action_destroy(action);
148 /* parallel tasks only */
149 if(task->simdata->host_list) xbt_free(task->simdata->host_list);
151 /* free main structures */
152 xbt_free(task->simdata);
159 /** \ingroup m_task_management
160 * \brief Cancel a #m_task_t.
161 * \param task the taskt to cancel. If it was executed or transfered, it
162 stops the process that were working on it.
164 MSG_error_t MSG_task_cancel(m_task_t task)
166 xbt_assert0((task != NULL), "Invalid parameter");
168 if(task->simdata->compute) {
169 SIMIX_action_cancel(task->simdata->compute);
172 if(task->simdata->comm) {
173 SIMIX_action_cancel(task->simdata->comm);
180 /** \ingroup m_task_management
181 * \brief Returns the computation amount needed to process a task #m_task_t.
182 * Once a task has been processed, this amount is thus set to 0...
184 double MSG_task_get_compute_duration(m_task_t task)
186 xbt_assert0((task != NULL) && (task->simdata != NULL), "Invalid parameter");
188 return task->simdata->computation_amount;
191 /** \ingroup m_task_management
192 * \brief Returns the remaining computation amount of a task #m_task_t.
195 double MSG_task_get_remaining_computation(m_task_t task)
197 xbt_assert0((task != NULL) && (task->simdata != NULL), "Invalid parameter");
199 if(task->simdata->compute) {
200 return SIMIX_action_get_remains(task->simdata->compute);
202 return task->simdata->computation_amount;
206 /** \ingroup m_task_management
207 * \brief Returns the size of the data attached to a task #m_task_t.
210 double MSG_task_get_data_size(m_task_t task)
212 xbt_assert0((task != NULL) && (task->simdata != NULL), "Invalid parameter");
214 return task->simdata->message_size;
219 /** \ingroup m_task_management
220 * \brief Changes the priority of a computation task. This priority doesn't affect
221 * the transfer rate. A priority of 2 will make a task receive two times more
222 * cpu power than the other ones.
225 void MSG_task_set_priority(m_task_t task, double priority)
227 xbt_assert0((task != NULL) && (task->simdata != NULL), "Invalid parameter");
229 task->simdata->priority = 1/priority;
230 if(task->simdata->compute)
231 SIMIX_action_set_priority(task->simdata->compute, task->simdata->priority);