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.
18 /** @addtogroup m_task_management
19 * \htmlonly <!-- DOXYGEN_NAVBAR_LABEL="Tasks" --> \endhtmlonly
21 * Since most scheduling algorithms rely on a concept of task
22 * that can be either <em>computed</em> locally or
23 * <em>transferred</em> on another processor, it seems to be the
24 * right level of abstraction for our purposes. A <em>task</em>
25 * may then be defined by a <em>computing amount</em>, a
26 * <em>message size</em> and some <em>private data</em>.
29 #ifdef HAVE_RUBY /* FIXME: KILLME */
30 XBT_LOG_EXTERNAL_CATEGORY(ruby);
33 /********************************* Task **************************************/
34 /** \ingroup m_task_management
35 * \brief Creates a new #m_task_t.
37 * A constructor for #m_task_t taking four arguments and returning the
39 * \param name a name for the object. It is for user-level information
41 * \param compute_duration a value of the processing amount (in flop)
42 needed to process this new task. If 0, then it cannot be executed with
43 MSG_task_execute(). This value has to be >=0.
44 * \param message_size a value of the amount of data (in bytes) needed to
45 transfer this new task. If 0, then it cannot be transfered with
46 MSG_task_get() and MSG_task_put(). This value has to be >=0.
47 * \param data a pointer to any data may want to attach to the new
48 object. It is for user-level information and can be NULL. It can
49 be retrieved with the function \ref MSG_task_get_data.
51 * \return The new corresponding object.
53 m_task_t MSG_task_create(const char *name, double compute_duration,
54 double message_size, void *data)
56 m_task_t task = xbt_new(s_m_task_t, 1);
57 simdata_task_t simdata = xbt_new(s_simdata_task_t, 1);
58 task->simdata = simdata;
60 task->name = xbt_strdup(name);
64 simdata->computation_amount = compute_duration;
65 simdata->message_size = message_size;
67 simdata->priority = 1.0;
68 simdata->refcount = 1;
69 simdata->sender = NULL;
70 simdata->receiver = NULL;
71 simdata->cond = SIMIX_cond_init();
72 simdata->mutex = SIMIX_mutex_init();
73 simdata->compute = NULL;
76 simdata->host_list = NULL;
77 simdata->comp_amount = NULL;
78 simdata->comm_amount = NULL;
80 #ifdef HAVE_RUBY /* FIXME: KILLME */
81 CINFO2(ruby,"Created task %p: %s",task,name);
87 /** \ingroup m_task_management
88 * \brief Return the user data of a #m_task_t.
90 * This functions checks whether \a task is a valid pointer or not and return
91 the user data associated to \a task if it is possible.
93 void *MSG_task_get_data(m_task_t task)
95 xbt_assert0((task != NULL), "Invalid parameter");
100 /** \ingroup m_task_management
101 * \brief Return the sender of a #m_task_t.
103 * This functions returns the #m_process_t which sent this task
105 m_process_t MSG_task_get_sender(m_task_t task)
107 xbt_assert0(task, "Invalid parameters");
108 return ((simdata_task_t) task->simdata)->sender;
111 /** \ingroup m_task_management
112 * \brief Return the source of a #m_task_t.
114 * This functions returns the #m_host_t from which this task was sent
116 m_host_t MSG_task_get_source(m_task_t task)
118 xbt_assert0(task, "Invalid parameters");
119 return ((simdata_task_t) task->simdata)->source;
122 /** \ingroup m_task_management
123 * \brief Return the name of a #m_task_t.
125 * This functions returns the name of a #m_task_t as specified on creation
127 const char *MSG_task_get_name(m_task_t task)
129 xbt_assert0(task, "Invalid parameters");
134 /** \ingroup m_task_management
135 * \brief Destroy a #m_task_t.
137 * Destructor for #m_task_t. Note that you should free user data, if any, \b
138 before calling this function.
140 MSG_error_t MSG_task_destroy(m_task_t task)
142 smx_action_t action = NULL;
143 xbt_assert0((task != NULL), "Invalid parameter");
145 /* 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? */
146 task->simdata->refcount--;
147 if (task->simdata->refcount > 0)
153 SIMIX_cond_destroy(task->simdata->cond);
154 SIMIX_mutex_destroy(task->simdata->mutex);
156 action = task->simdata->compute;
158 SIMIX_action_destroy(action);
160 /* parallel tasks only */
161 if (task->simdata->host_list)
162 xbt_free(task->simdata->host_list);
164 /* free main structures */
165 xbt_free(task->simdata);
172 /** \ingroup m_task_management
173 * \brief Cancel a #m_task_t.
174 * \param task the taskt to cancel. If it was executed or transfered, it
175 stops the process that were working on it.
177 MSG_error_t MSG_task_cancel(m_task_t task)
179 xbt_assert0((task != NULL), "Invalid parameter");
181 if (task->simdata->compute) {
182 SIMIX_action_cancel(task->simdata->compute);
185 if (task->simdata->comm) {
186 SIMIX_communication_cancel(task->simdata->comm);
193 /** \ingroup m_task_management
194 * \brief Returns the computation amount needed to process a task #m_task_t.
195 * Once a task has been processed, this amount is thus set to 0...
197 double MSG_task_get_compute_duration(m_task_t task)
199 xbt_assert0((task != NULL)
200 && (task->simdata != NULL), "Invalid parameter");
202 return task->simdata->computation_amount;
205 /** \ingroup m_task_management
206 * \brief Returns the remaining computation amount of a task #m_task_t.
209 double MSG_task_get_remaining_computation(m_task_t task)
211 xbt_assert0((task != NULL)
212 && (task->simdata != NULL), "Invalid parameter");
214 if (task->simdata->compute) {
215 return SIMIX_action_get_remains(task->simdata->compute);
217 return task->simdata->computation_amount;
223 /** \ingroup m_task_management
224 * \brief Returns the total amount received by a task #m_task_t.
227 double MSG_task_get_remaining_communication(m_task_t task)
229 xbt_assert0((task != NULL)
230 && (task->simdata != NULL), "Invalid parameter");
232 return SIMIX_communication_get_remains(task->simdata->comm);
235 /** \ingroup m_task_management
236 * \brief Returns the size of the data attached to a task #m_task_t.
239 double MSG_task_get_data_size(m_task_t task)
241 xbt_assert0((task != NULL)
242 && (task->simdata != NULL), "Invalid parameter");
244 return task->simdata->message_size;
249 /** \ingroup m_task_management
250 * \brief Changes the priority of a computation task. This priority doesn't affect
251 * the transfer rate. A priority of 2 will make a task receive two times more
252 * cpu power than the other ones.
255 void MSG_task_set_priority(m_task_t task, double priority)
257 xbt_assert0((task != NULL)
258 && (task->simdata != NULL), "Invalid parameter");
260 task->simdata->priority = 1 / priority;
261 if (task->simdata->compute)
262 SIMIX_action_set_priority(task->simdata->compute,
263 task->simdata->priority);