2 #include "xbt/sysdep.h"
5 /** \defgroup m_task_management Managing functions of Tasks
6 * \brief This section describes the task structure of MSG
7 * (#m_task_t) and the functions for managing it.
8 * \htmlonly <!-- DOXYGEN_NAVBAR_LABEL="Tasks" --> \endhtmlonly
10 * Since most scheduling algorithms rely on a concept of task
11 * that can be either <em>computed</em> locally or
12 * <em>transferred</em> on another processor, it seems to be the
13 * right level of abstraction for our purposes. A <em>task</em>
14 * may then be defined by a <em>computing amount</em>, a
15 * <em>message size</em> and some <em>private data</em>.
18 /********************************* Task **************************************/
19 /** \ingroup m_task_management
20 * \brief Creates a new #m_task_t.
22 * A constructor for #m_task_t taking four arguments and returning the
24 * \param name a name for the object. It is for user-level information
26 * \param compute_duration a value of the processing amount (in flop)
27 needed to process this new task. If 0, then it cannot be executed with
28 MSG_task_execute(). This value has to be >=0.
29 * \param message_size a value of the amount of data (in bytes) needed to
30 transfer this new task. If 0, then it cannot be transfered with
31 MSG_task_get() and MSG_task_put(). This value has to be >=0.
32 * \param data a pointer to any data may want to attach to the new
33 object. It is for user-level information and can be NULL. It can
34 be retrieved with the function \ref MSG_task_get_data.
36 * \return The new corresponding object.
38 m_task_t MSG_task_create(const char *name, double compute_duration,
39 double message_size, void *data)
41 m_task_t task = xbt_new(s_m_task_t,1);
42 simdata_task_t simdata = task->simdata;
43 task->simdata = simdata;
45 task->name = xbt_strdup(name);
49 simdata->computation_amount = compute_duration;
50 simdata->message_size = message_size;
52 simdata->priority = 1.0;
54 simdata->sender = NULL;
55 simdata->cond = SIMIX_cond_init();
56 simdata->mutex = SIMIX_mutex_init();
61 /** \ingroup m_task_management
62 * \brief Return the user data of a #m_task_t.
64 * This functions checks whether \a task is a valid pointer or not and return
65 the user data associated to \a task if it is possible.
67 void *MSG_task_get_data(m_task_t task)
69 xbt_assert0((task != NULL), "Invalid parameter");
74 /** \ingroup m_task_management
75 * \brief Return the sender of a #m_task_t.
77 * This functions returns the #m_process_t which sent this task
79 m_process_t MSG_task_get_sender(m_task_t task)
81 xbt_assert0(task, "Invalid parameters");
82 return ((simdata_task_t) task->simdata)->sender;
85 /** \ingroup m_task_management
86 * \brief Return the source of a #m_task_t.
88 * This functions returns the #m_host_t from which this task was sent
90 m_host_t MSG_task_get_source(m_task_t task)
92 xbt_assert0(task, "Invalid parameters");
93 return ((simdata_task_t) task->simdata)->source;
96 /** \ingroup m_task_management
97 * \brief Return the name of a #m_task_t.
99 * This functions returns the name of a #m_task_t as specified on creation
101 const char *MSG_task_get_name(m_task_t task)
103 xbt_assert0(task, "Invalid parameters");
108 /** \ingroup m_task_management
109 * \brief Destroy a #m_task_t.
111 * Destructor for #m_task_t. Note that you should free user data, if any, \b
112 before calling this function.
114 MSG_error_t MSG_task_destroy(m_task_t task)
116 smx_action_t action = NULL;
117 xbt_assert0((task != NULL), "Invalid parameter");
119 /* 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 code wrong? */
120 task->simdata->using--;
121 if(task->simdata->using>0) return MSG_OK;
123 if(task->name) free(task->name);
125 SIMIX_cond_destroy(task->simdata->cond);
126 SIMIX_mutex_destroy(task->simdata->mutex);
128 action = task->simdata->compute;
129 if(action) SIMIX_action_destroy(action);
130 action = task->simdata->comm;
131 if(action) SIMIX_action_destroy(action);
132 /* parallel tasks only */
133 if(task->simdata->host_list) xbt_free(task->simdata->host_list);
135 /* free main structures */
136 xbt_free(task->simdata);
143 /** \ingroup m_task_management
144 * \brief Cancel a #m_task_t.
145 * \param task the taskt to cancel. If it was executed or transfered, it
146 stops the process that were working on it.
148 MSG_error_t MSG_task_cancel(m_task_t task)
150 xbt_assert0((task != NULL), "Invalid parameter");
152 if(task->simdata->compute) {
153 SIMIX_action_cancel(task->simdata->compute);
156 if(task->simdata->comm) {
157 SIMIX_action_cancel(task->simdata->comm);
164 /** \ingroup m_task_management
165 * \brief Returns the computation amount needed to process a task #m_task_t.
166 * Once a task has been processed, this amount is thus set to 0...
168 double MSG_task_get_compute_duration(m_task_t task)
170 xbt_assert0((task != NULL) && (task->simdata != NULL), "Invalid parameter");
172 return task->simdata->computation_amount;
175 /** \ingroup m_task_management
176 * \brief Returns the remaining computation amount of a task #m_task_t.
179 double MSG_task_get_remaining_computation(m_task_t task)
181 xbt_assert0((task != NULL) && (task->simdata != NULL), "Invalid parameter");
183 if(task->simdata->compute) {
184 return SIMIX_action_get_remains(task->simdata->compute);
186 return task->simdata->computation_amount;
190 /** \ingroup m_task_management
191 * \brief Returns the size of the data attached to a task #m_task_t.
194 double MSG_task_get_data_size(m_task_t task)
196 xbt_assert0((task != NULL) && (task->simdata != NULL), "Invalid parameter");
198 return task->simdata->message_size;
203 /** \ingroup m_task_management
204 * \brief Changes the priority of a computation task. This priority doesn't affect
205 * the transfer rate. A priority of 2 will make a task receive two times more
206 * cpu power than the other ones.
209 void MSG_task_set_priority(m_task_t task, double priority)
211 xbt_assert0((task != NULL) && (task->simdata != NULL), "Invalid parameter");
213 task->simdata->priority = 1/priority;
214 if(task->simdata->compute)
215 SIMIX_action_set_priority(task->simdata->compute, task->simdata->priority);