1 /* Copyright (c) 2004, 2005, 2006, 2007, 2008, 2009, 2010. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #include "msg/private.h"
8 #include "xbt/sysdep.h"
11 /** \defgroup m_task_management Managing functions of Tasks
12 * \brief This section describes the task structure of MSG
13 * (#m_task_t) and the functions for managing it.
15 /** @addtogroup m_task_management
16 * \htmlonly <!-- DOXYGEN_NAVBAR_LABEL="Tasks" --> \endhtmlonly
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 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_task, msg,
27 "Logging specific to MSG (task)");
29 /********************************* Task **************************************/
30 /** \ingroup m_task_management
31 * \brief Creates a new #m_task_t.
33 * A constructor for #m_task_t taking four arguments and returning the
35 * \param name a name for the object. It is for user-level information
37 * \param compute_duration a value of the processing amount (in flop)
38 needed to process this new task. If 0, then it cannot be executed with
39 MSG_task_execute(). This value has to be >=0.
40 * \param message_size a value of the amount of data (in bytes) needed to
41 transfer this new task. If 0, then it cannot be transfered with
42 MSG_task_get() and MSG_task_put(). This value has to be >=0.
43 * \param data a pointer to any data may want to attach to the new
44 object. It is for user-level information and can be NULL. It can
45 be retrieved with the function \ref MSG_task_get_data.
47 * \return The new corresponding object.
49 m_task_t MSG_task_create(const char *name, double compute_duration,
50 double message_size, void *data)
52 m_task_t task = xbt_new(s_m_task_t, 1);
53 simdata_task_t simdata = xbt_new(s_simdata_task_t, 1);
54 task->simdata = simdata;
56 task->name = xbt_strdup(name);
61 simdata->computation_amount = compute_duration;
62 simdata->message_size = message_size;
64 simdata->priority = 1.0;
66 simdata->sender = NULL;
67 simdata->receiver = NULL;
68 simdata->compute = NULL;
71 simdata->host_list = NULL;
72 simdata->comp_amount = NULL;
73 simdata->comm_amount = NULL;
75 TRACE_msg_task_create(task);
81 /** \ingroup m_task_management
82 * \brief Return the user data of a #m_task_t.
84 * This function checks whether \a task is a valid pointer or not and return
85 the user data associated to \a task if it is possible.
87 void *MSG_task_get_data(m_task_t task)
89 xbt_assert((task != NULL), "Invalid parameter");
94 /** \ingroup m_task_management
95 * \brief Sets the user data of a #m_task_t.
97 * This function allows to associate a new pointer to
98 the user data associated of \a task.
100 void MSG_task_set_data(m_task_t task, void *data)
102 xbt_assert((task != NULL), "Invalid parameter");
107 /** \ingroup m_task_management
108 * \brief Return the sender of a #m_task_t.
110 * This functions returns the #m_process_t which sent this task
112 m_process_t MSG_task_get_sender(m_task_t task)
114 xbt_assert(task, "Invalid parameters");
115 return ((simdata_task_t) task->simdata)->sender;
118 /** \ingroup m_task_management
119 * \brief Return the source of a #m_task_t.
121 * This functions returns the #m_host_t from which this task was sent
123 m_host_t MSG_task_get_source(m_task_t task)
125 xbt_assert(task, "Invalid parameters");
126 return ((simdata_task_t) task->simdata)->source;
129 /** \ingroup m_task_management
130 * \brief Return the name of a #m_task_t.
132 * This functions returns the name of a #m_task_t as specified on creation
134 const char *MSG_task_get_name(m_task_t task)
136 xbt_assert(task, "Invalid parameters");
140 /** \ingroup m_task_management
141 * \brief Return the name of a #m_task_t.
143 * This functions allows to associate a name to a task
145 void MSG_task_set_name(m_task_t task, const char *name)
147 xbt_assert(task, "Invalid parameters");
148 task->name = xbt_strdup(name);
151 /** \ingroup m_task_management
152 * \brief Destroy a #m_task_t.
154 * Destructor for #m_task_t. Note that you should free user data, if any, \b
155 before calling this function.
157 MSG_error_t MSG_task_destroy(m_task_t task)
159 smx_action_t action = NULL;
160 xbt_assert((task != NULL), "Invalid parameter");
162 /* 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? */
163 if (task->simdata->isused > 0) {
164 XBT_DEBUG("Cannot destroy task %p since somebody is using it", task);
168 TRACE_msg_task_destroy(task);
174 action = task->simdata->compute;
176 SIMIX_req_host_execution_destroy(action);
178 /* parallel tasks only */
179 if (task->simdata->host_list)
180 xbt_free(task->simdata->host_list);
182 /* free main structures */
183 xbt_free(task->simdata);
190 /** \ingroup m_task_management
191 * \brief Cancel a #m_task_t.
192 * \param task the task to cancel. If it was executed or transfered, it
193 stops the process that were working on it.
195 MSG_error_t MSG_task_cancel(m_task_t task)
197 xbt_assert((task != NULL), "Invalid parameter");
199 if (task->simdata->compute) {
200 SIMIX_req_host_execution_cancel(task->simdata->compute);
202 else if (task->simdata->comm) {
203 SIMIX_req_comm_cancel(task->simdata->comm);
206 XBT_DEBUG("Task %p will not be cancelled since it is not running", task);
211 /** \ingroup m_task_management
212 * \brief Returns the computation amount needed to process a task #m_task_t.
213 * Once a task has been processed, this amount is thus set to 0...
215 double MSG_task_get_compute_duration(m_task_t task)
217 xbt_assert((task != NULL)
218 && (task->simdata != NULL), "Invalid parameter");
220 return task->simdata->computation_amount;
224 /** \ingroup m_task_management
225 * \brief set the computation amount needed to process a task #m_task_t.
228 void MSG_task_set_compute_duration(m_task_t task,
229 double computation_amount)
231 xbt_assert(task, "Invalid parameter");
232 task->simdata->computation_amount = computation_amount;
236 /** \ingroup m_task_management
237 * \brief Returns the remaining computation amount of a task #m_task_t.
240 double MSG_task_get_remaining_computation(m_task_t task)
242 xbt_assert((task != NULL)
243 && (task->simdata != NULL), "Invalid parameter");
245 if (task->simdata->compute) {
246 return SIMIX_req_host_execution_get_remains(task->simdata->compute);
248 return task->simdata->computation_amount;
252 /** \ingroup m_task_management
253 * \brief Returns the total amount received by a task #m_task_t.
254 * If the communication does not exist it will return 0.
255 * So, if the communication has FINISHED or FAILED it returns
258 double MSG_task_get_remaining_communication(m_task_t task)
260 xbt_assert((task != NULL)
261 && (task->simdata != NULL), "Invalid parameter");
262 XBT_DEBUG("calling SIMIX_req_communication_get_remains(%p)",
263 task->simdata->comm);
264 return SIMIX_req_comm_get_remains(task->simdata->comm);
267 #ifdef HAVE_LATENCY_BOUND_TRACKING
268 /** \ingroup m_task_management
269 * \brief Return 1 if communication task is limited by latency, 0 otherwise
272 int MSG_task_is_latency_bounded(m_task_t task)
274 xbt_assert((task != NULL)
275 && (task->simdata != NULL), "Invalid parameter");
276 XBT_DEBUG("calling SIMIX_req_communication_is_latency_bounded(%p)",
277 task->simdata->comm);
278 return SIMIX_req_comm_is_latency_bounded(task->simdata->comm);
282 /** \ingroup m_task_management
283 * \brief Returns the size of the data attached to a task #m_task_t.
286 double MSG_task_get_data_size(m_task_t task)
288 xbt_assert((task != NULL)
289 && (task->simdata != NULL), "Invalid parameter");
291 return task->simdata->message_size;
296 /** \ingroup m_task_management
297 * \brief Changes the priority of a computation task. This priority doesn't affect
298 * the transfer rate. A priority of 2 will make a task receive two times more
299 * cpu power than the other ones.
302 void MSG_task_set_priority(m_task_t task, double priority)
304 xbt_assert((task != NULL)
305 && (task->simdata != NULL), "Invalid parameter");
307 task->simdata->priority = 1 / priority;
308 if (task->simdata->compute)
309 SIMIX_req_host_execution_set_priority(task->simdata->compute,
310 task->simdata->priority);