SD_global_t sd_global = NULL;
-/* Initialises SD internal data. This function should be called before any other SD function.
+/**
+ * \brief Initialises SD internal data
+ *
+ * This function must be called before any other SD function. Then you
+ * should call SD_create_environment().
+ *
+ * \param argc argument number
+ * \param argv argument list
+ * \see SD_create_environment(), SD_exit()
*/
void SD_init(int *argc, char **argv) {
xbt_assert0(sd_global == NULL, "SD_init already called");
surf_init(argc, argv);
}
-/* Creates the environnement described in a xml file of a platform description.
+/**
+ * \brief Creates the environment
+ *
+ * The environment (i.e. the \ref SD_workstation_management "workstations" and the
+ * \ref SD_link_management "links") is created with the data stored in the given XML
+ * platform file.
+ *
+ * \param platform_file name of an XML file describing the environment to create
+ * \see SD_workstation_management, SD_link_management
+ *
+ * The XML file follows this DTD:
+ *
+ * \include surfxml.dtd
+ *
+ * Here is a small example of such a platform:
+ *
+ * \include small_platform.xml
*/
void SD_create_environment(const char *platform_file) {
xbt_dict_cursor_t cursor = NULL;
}
}
-/* Launches the simulation. Returns a NULL-terminated array of SD_task_t whose state has changed.
+/**
+ * \brief Launches the simulation.
+ *
+ * The function will execute the \ref SD_READY ready tasks.
+ * The simulation will be stopped when its time reaches \a how_long,
+ * when a watch point is reached, or when no more task can be executed.
+ * Then you can call SD_simulate() again.
+ *
+ * \param how_long maximum duration of the simulation
+ * \return a NULL-terminated array of \ref SD_task_t whose state has changed.
+ * \see SD_task_schedule(), SD_task_watch()
*/
SD_task_t* SD_simulate(double how_long)
{
double total_time = 0.0; /* we stop the simulation when total_time >= how_long */
double elapsed_time = 0.0;
- SD_task_t task;
+ SD_task_t task, dst;
+ SD_dependency_t dependency;
surf_action_t action;
SD_task_t *changed_tasks = NULL;
int changed_task_number = 0;
int changed_task_capacity = 16; /* will be increased if necessary */
+ int i;
+ static int first_time = 1;
+
+ INFO0("Starting simulation...");
/* create the array that will be returned */
changed_tasks = xbt_new0(SD_task_t, changed_task_capacity);
changed_tasks[0] = NULL;
- surf_solve(); /* Takes traces into account. Returns 0.0 */
+ if (first_time) {
+ surf_solve(); /* Takes traces into account. Returns 0.0 */
+ first_time = 0;
+ }
sd_global->watch_point_reached = 0;
+ /* explore the ready tasks */
+ xbt_swag_foreach(task, sd_global->ready_task_set) {
+ INFO1("Executing task '%s'", SD_task_get_name(task));
+ action = __SD_task_run(task);
+ surf_workstation_resource->common_public->action_set_data(action, task);
+ task->state_changed = 1;
+
+ changed_tasks[changed_task_number++] = task; /* replace NULL by the task */
+ if (changed_task_number == changed_task_capacity) {
+ changed_task_capacity *= 2;
+ changed_tasks = xbt_realloc(changed_tasks, sizeof(SD_task_t) * changed_task_capacity);
+ }
+ changed_tasks[changed_task_number] = NULL;
+ }
+
/* main loop */
+ elapsed_time = 0.0;
while (elapsed_time >= 0.0 && total_time < how_long && !sd_global->watch_point_reached) {
- /* explore the ready tasks */
- xbt_swag_foreach(task, sd_global->ready_task_set) {
- INFO1("Executing task '%s'", SD_task_get_name(task));
- task->state_changed = 0;
- action = __SD_task_run(task);
- surf_workstation_resource->common_public->action_set_data(action, task);
- task->state_changed = 1;
-
- changed_tasks[changed_task_number++] = task; /* replace NULL by the task */
- if (changed_task_number == changed_task_capacity) {
- changed_task_capacity *= 2;
- changed_tasks = xbt_realloc(changed_tasks, sizeof(SD_task_t) * changed_task_capacity);
- }
- changed_tasks[changed_task_number] = NULL;
- }
-
elapsed_time = surf_solve();
if (elapsed_time > 0.0)
total_time += elapsed_time;
task = action->data;
INFO1("Task '%s' done", SD_task_get_name(task));
__SD_task_set_state(task, SD_DONE);
- __SD_task_remove_dependencies(task);
+
+ /* the state has changed */
if (!task->state_changed) {
task->state_changed = 1;
changed_tasks[changed_task_number++] = task;
+ if (changed_task_number == changed_task_capacity) {
+ changed_task_capacity *= 2;
+ changed_tasks = xbt_realloc(changed_tasks, sizeof(SD_task_t) * changed_task_capacity);
+ }
+ changed_tasks[changed_task_number] = NULL;
+ }
+
+ /* remove the dependencies after this task */
+ while (xbt_dynar_length(task->tasks_after) > 0) {
+ xbt_dynar_get_cpy(task->tasks_after, 0, &dependency);
+ dst = dependency->dst;
+ SD_task_dependency_remove(task, dst);
+
+ /* is dst ready now? */
+ if (__SD_task_is_ready(dst) && !sd_global->watch_point_reached) {
+ INFO1("Executing task '%s'", SD_task_get_name(dst));
+ action = __SD_task_run(dst);
+ surf_workstation_resource->common_public->action_set_data(action, dst);
+ dst->state_changed = 1;
+
+ changed_tasks[changed_task_number++] = dst;
+ if (changed_task_number == changed_task_capacity) {
+ changed_task_capacity *= 2;
+ changed_tasks = xbt_realloc(changed_tasks, sizeof(SD_task_t) * changed_task_capacity);
+ }
+ changed_tasks[changed_task_number] = NULL;
+ }
}
}
if (!task->state_changed) {
task->state_changed = 1;
changed_tasks[changed_task_number++] = task;
+ if (changed_task_number == changed_task_capacity) {
+ changed_task_capacity *= 2;
+ changed_tasks = xbt_realloc(changed_tasks, sizeof(SD_task_t) * changed_task_capacity);
+ }
+ changed_tasks[changed_task_number] = NULL;
}
}
}
+ /* we must reset every task->state_changed */
+ i = 0;
+ while (changed_tasks[i] != NULL) {
+ changed_tasks[i]->state_changed = 0;
+ i++;
+ }
+
INFO0("Simulation finished");
- INFO1("Number of tasks whose state has changed: %d", changed_task_number);
+ /* printf("elapsed_time = %f, total_time = %f, watch_point_reached = %d\n", elapsed_time, total_time, sd_global->watch_point_reached);*/
return changed_tasks;
}
-/* Destroys all SD internal data. This function should be called when the simulation is over.
- * The tasks should have been destroyed first.
+/**
+ * \brief Destroys all SD internal data.
+ *
+ * This function should be called when the simulation is over. Don't forget also to destroy
+ * the tasks.
+ *
+ * \see SD_init(), SD_task_destroy()
*/
void SD_exit(void) {
if (sd_global != NULL) {
