2 #include "simdag/simdag.h"
3 #include "xbt/sysdep.h"
6 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sd_task,sd,
7 "Logging specific to SimDag (task)");
9 static void __SD_task_remove_dependencies(SD_task_t task);
12 * \brief Creates a new task.
14 * \param name the name of the task (can be \c NULL)
15 * \param data the user data you want to associate with the task (can be \c NULL)
16 * \return the new task
17 * \see SD_task_destroy()
19 SD_task_t SD_task_create(const char *name, void *data, double amount) {
22 SD_task_t task = xbt_new0(s_SD_task_t, 1);
24 /* general information */
25 task->data = data; /* user data */
27 task->name = xbt_strdup(name);
31 task->state_set = sd_global->not_scheduled_task_set;
32 xbt_swag_insert(task,task->state_set);
34 task->amount = amount;
35 task->surf_action = NULL;
36 task->watch_points = 0;
37 task->state_changed = 0;
40 task->tasks_before = xbt_dynar_new(sizeof(SD_dependency_t), NULL);
41 task->tasks_after = xbt_dynar_new(sizeof(SD_dependency_t), NULL);
43 /* scheduling parameters */
44 task->workstation_nb = 0;
45 task->workstation_list = NULL;
46 task->computation_amount = NULL;
47 task->communication_amount = NULL;
54 * \brief Returns the user data of a task
57 * \return the user data associated with this task (can be \c NULL)
58 * \see SD_task_set_data()
60 void* SD_task_get_data(SD_task_t task) {
62 xbt_assert0(task != NULL, "Invalid parameter");
67 * \brief Sets the user data of a task
69 * The new data can be \c NULL. The old data should have been freed first
70 * if it was not \c NULL.
73 * \param data the new data you want to associate with this task
74 * \see SD_task_get_data()
76 void SD_task_set_data(SD_task_t task, void *data) {
78 xbt_assert0(task != NULL, "Invalid parameter");
83 * \brief Returns the state of a task
86 * \return the current \ref e_SD_task_state_t "state" of this task:
87 * #SD_NOT_SCHEDULED, #SD_SCHEDULED, #SD_READY, #SD_RUNNING, #SD_DONE or #SD_FAILED
88 * \see e_SD_task_state_t
90 e_SD_task_state_t SD_task_get_state(SD_task_t task) {
92 xbt_assert0(task != NULL, "Invalid parameter");
94 if (task->state_set == sd_global->scheduled_task_set)
96 if (task->state_set == sd_global->done_task_set)
98 if (task->state_set == sd_global->running_task_set)
100 if (task->state_set == sd_global->ready_task_set)
102 if (task->state_set == sd_global->not_scheduled_task_set)
103 return SD_NOT_SCHEDULED;
107 /* Changes the state of a task. Updates the swags and the flag sd_global->watch_point_reached.
109 void __SD_task_set_state(SD_task_t task, e_SD_task_state_t new_state) {
110 xbt_swag_remove(task, task->state_set);
112 case SD_NOT_SCHEDULED:
113 task->state_set = sd_global->not_scheduled_task_set;
116 task->state_set = sd_global->scheduled_task_set;
119 task->state_set = sd_global->ready_task_set;
122 task->state_set = sd_global->running_task_set;
125 task->state_set = sd_global->done_task_set;
128 task->state_set = sd_global->failed_task_set;
131 xbt_assert0(0, "Invalid state");
133 xbt_swag_insert(task, task->state_set);
135 if (task->watch_points & new_state) {
136 INFO1("Watch point reached with task '%s'!", SD_task_get_name(task));
137 sd_global->watch_point_reached = 1;
138 SD_task_unwatch(task, new_state); /* remove the watch point */
143 * \brief Returns the name of a task
146 * \return the name of this task (can be \c NULL)
148 const char* SD_task_get_name(SD_task_t task) {
149 SD_CHECK_INIT_DONE();
150 xbt_assert0(task != NULL, "Invalid parameter");
155 * \brief Returns the total amount of a task
158 * \return the total amount of this task
159 * \see SD_task_get_remaining_amount()
161 double SD_task_get_amount(SD_task_t task) {
162 SD_CHECK_INIT_DONE();
163 xbt_assert0(task != NULL, "Invalid parameter");
168 * \brief Returns the remaining amount of a task
171 * \return the remaining amount of this task
172 * \see SD_task_get_amount()
174 double SD_task_get_remaining_amount(SD_task_t task) {
175 SD_CHECK_INIT_DONE();
176 xbt_assert0(task != NULL, "Invalid parameter");
178 if (task->surf_action)
179 return task->surf_action->remains;
184 /* temporary function for debbuging */
185 static void __SD_print_dependencies(SD_task_t task) {
186 INFO1("The following tasks must be executed before %s:", SD_task_get_name(task));
187 xbt_dynar_t dynar = task->tasks_before;
188 int length = xbt_dynar_length(dynar);
190 SD_dependency_t dependency;
191 for (i = 0; i < length; i++) {
192 xbt_dynar_get_cpy(dynar, i, &dependency);
193 INFO1(" %s", SD_task_get_name(dependency->src));
196 INFO1("The following tasks must be executed after %s:", SD_task_get_name(task));
198 dynar = task->tasks_after;
199 length = xbt_dynar_length(dynar);
200 for (i = 0; i < length; i++) {
201 xbt_dynar_get_cpy(dynar, i, &dependency);
202 INFO1(" %s", SD_task_get_name(dependency->dst));
204 INFO0("----------------------------");
207 /* Destroys a dependency between two tasks.
209 static void __SD_task_dependency_destroy(void *dependency) {
210 if (((SD_dependency_t) dependency)->name != NULL)
211 xbt_free(((SD_dependency_t) dependency)->name);
212 xbt_free(dependency);
216 * \brief Adds a dependency between two tasks
218 * \a dst will depend on \a src, ie \a dst will not start before \a src is finished.
219 * Their \ref e_SD_task_state_t "state" must be #SD_NOT_SCHEDULED, #SD_SCHEDULED or #SD_READY.
221 * \param name the name of the new dependency (can be \c NULL)
222 * \param data the user data you want to associate with this dependency (can be \c NULL)
223 * \param src the task which must be executed first
224 * \param dst the task you want to make depend on \a src
225 * \see SD_task_dependency_remove()
227 void SD_task_dependency_add(const char *name, void *data, SD_task_t src, SD_task_t dst) {
228 SD_CHECK_INIT_DONE();
229 xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
230 xbt_assert1(src != dst, "Cannot add a dependency between task '%s' and itself", SD_task_get_name(src));
231 xbt_assert1(__SD_task_is_not_scheduled(src) || __SD_task_is_scheduled_or_ready(src),
232 "Task '%s' must be SD_NOT_SCHEDULED, SD_SCHEDULED or SD_READY", SD_task_get_name(src));
233 xbt_assert1(__SD_task_is_not_scheduled(dst) || __SD_task_is_scheduled_or_ready(dst),
234 "Task '%s' must be SD_NOT_SCHEDULED, SD_SCHEDULED or SD_READY", SD_task_get_name(dst));
236 xbt_dynar_t dynar = src->tasks_after;
237 int length = xbt_dynar_length(dynar);
240 SD_dependency_t dependency;
241 for (i = 0; i < length && !found; i++) {
242 xbt_dynar_get_cpy(dynar, i, &dependency);
243 found = (dependency->dst == dst);
245 xbt_assert2(!found, "A dependency already exists between task '%s' and task '%s'",
246 SD_task_get_name(src), SD_task_get_name(dst));
248 dependency = xbt_new0(s_SD_dependency_t, 1);
251 dependency->name = xbt_strdup(name);
252 dependency->data = data;
253 dependency->src = src;
254 dependency->dst = dst;
256 /* src must be executed before dst */
257 xbt_dynar_push(src->tasks_after, &dependency);
258 xbt_dynar_push(dst->tasks_before, &dependency);
260 /* if the task was ready, then dst->tasks_before is not empty anymore,
261 so we must go back to state SD_SCHEDULED */
262 if (__SD_task_is_ready(dst)) {
263 DEBUG1("SD_task_dependency_add: %s was ready and becomes scheduled!", SD_task_get_name(dst));
264 __SD_task_set_state(dst, SD_SCHEDULED);
267 /* __SD_print_dependencies(src);
268 __SD_print_dependencies(dst); */
272 * \brief Remove a dependency between two tasks
275 * \param dst a task depending on \a src
276 * \see SD_task_dependency_add()
278 void SD_task_dependency_remove(SD_task_t src, SD_task_t dst) {
279 SD_CHECK_INIT_DONE();
280 xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
282 /* remove the dependency from src->tasks_after */
283 xbt_dynar_t dynar = src->tasks_after;
284 int length = xbt_dynar_length(dynar);
287 SD_dependency_t dependency;
288 for (i = 0; i < length && !found; i++) {
289 xbt_dynar_get_cpy(dynar, i, &dependency);
290 if (dependency->dst == dst) {
291 xbt_dynar_remove_at(dynar, i, NULL);
295 xbt_assert4(found, "No dependency found between task '%s' and '%s': task '%s' is not a successor of task '%s'",
296 SD_task_get_name(src), SD_task_get_name(dst), SD_task_get_name(dst), SD_task_get_name(src));
298 /* remove the dependency from dst->tasks_before */
299 dynar = dst->tasks_before;
300 length = xbt_dynar_length(dynar);
303 for (i = 0; i < length && !found; i++) {
304 xbt_dynar_get_cpy(dynar, i, &dependency);
305 if (dependency->src == src) {
306 xbt_dynar_remove_at(dynar, i, NULL);
307 __SD_task_dependency_destroy(dependency);
311 xbt_assert4(found, "SimDag error: task '%s' is a successor of '%s' but task '%s' is not a predecessor of task '%s'",
312 SD_task_get_name(dst), SD_task_get_name(src), SD_task_get_name(src), SD_task_get_name(dst)); /* should never happen... */
314 /* if the task was scheduled and dst->tasks_before is empty now, we can make it ready */
315 if (xbt_dynar_length(dst->tasks_before) == 0 && __SD_task_is_scheduled(dst))
316 __SD_task_set_state(dst, SD_READY);
318 /* __SD_print_dependencies(src);
319 __SD_print_dependencies(dst);*/
323 * \brief Returns the user data associated with a dependency between two tasks
326 * \param dst a task depending on \a src
327 * \return the user data associated with this dependency (can be \c NULL)
328 * \see SD_task_dependency_add()
330 void *SD_task_dependency_get_data(SD_task_t src, SD_task_t dst) {
331 SD_CHECK_INIT_DONE();
332 xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
334 xbt_dynar_t dynar = src->tasks_after;
335 int length = xbt_dynar_length(dynar);
338 SD_dependency_t dependency;
339 for (i = 0; i < length && !found; i++) {
340 xbt_dynar_get_cpy(dynar, i, &dependency);
341 found = (dependency->dst == dst);
343 xbt_assert2(found, "No dependency found between task '%s' and '%s'", SD_task_get_name(src), SD_task_get_name(dst));
344 return dependency->data;
347 /* temporary function for debugging */
348 static void __SD_print_watch_points(SD_task_t task) {
349 static const int state_masks[] = {SD_SCHEDULED, SD_RUNNING, SD_READY, SD_DONE, SD_FAILED};
350 static const char* state_names[] = {"scheduled", "running", "ready", "done", "failed"};
352 INFO2("Task '%s' watch points (%x): ", SD_task_get_name(task), task->watch_points);
355 for (i = 0; i < 5; i++) {
356 if (task->watch_points & state_masks[i])
357 INFO1("%s ", state_names[i]);
362 * \brief Adds a watch point to a task
364 * SD_simulate() will stop as soon as the \ref e_SD_task_state_t "state" of this task becomes the one given in argument. The
365 * watch point is then automatically removed.
368 * \param state the \ref e_SD_task_state_t "state" you want to watch (cannot be #SD_NOT_SCHEDULED)
369 * \see SD_task_unwatch()
371 void SD_task_watch(SD_task_t task, e_SD_task_state_t state) {
372 SD_CHECK_INIT_DONE();
373 xbt_assert0(task != NULL, "Invalid parameter");
374 xbt_assert0(state != SD_NOT_SCHEDULED, "Cannot add a watch point for state SD_NOT_SCHEDULED");
376 task->watch_points = task->watch_points | state;
377 /* __SD_print_watch_points(task);*/
381 * \brief Removes a watch point from a task
384 * \param state the \ref e_SD_task_state_t "state" you no longer want to watch
385 * \see SD_task_watch()
387 void SD_task_unwatch(SD_task_t task, e_SD_task_state_t state) {
388 SD_CHECK_INIT_DONE();
389 xbt_assert0(task != NULL, "Invalid parameter");
390 xbt_assert0(state != SD_NOT_SCHEDULED, "Cannot have a watch point for state SD_NOT_SCHEDULED");
392 task->watch_points = task->watch_points & ~state;
393 /* __SD_print_watch_points(task);*/
396 /* Destroys the data memorised by SD_task_schedule. Task state must be SD_SCHEDULED or SD_READY.
398 static void __SD_task_destroy_scheduling_data(SD_task_t task) {
399 SD_CHECK_INIT_DONE();
400 xbt_assert1(__SD_task_is_scheduled_or_ready(task),
401 "Task '%s' must be SD_SCHEDULED or SD_READY", SD_task_get_name(task));
402 xbt_free(task->workstation_list);
403 xbt_free(task->computation_amount);
404 xbt_free(task->communication_amount);
408 * \brief Schedules a task
410 * The task state must be #SD_NOT_SCHEDULED.
411 * Once scheduled, a task will be executed as soon as possible in SD_simulate(),
412 * i.e. when its dependencies are satisfied.
414 * \param task the task you want to schedule
415 * \param workstation_nb number of workstations on which the task will be executed
416 * \param workstation_list the workstations on which the task will be executed
417 * \param computation_amount computation amount for each workstation
418 * \param communication_amount communication amount between each pair of workstations
419 * \param rate task execution speed rate
420 * \see SD_task_unschedule()
422 void SD_task_schedule(SD_task_t task, int workstation_nb,
423 const SD_workstation_t *workstation_list, const double *computation_amount,
424 const double *communication_amount, double rate) {
425 SD_CHECK_INIT_DONE();
426 xbt_assert0(task, "Invalid parameter");
427 xbt_assert1(__SD_task_is_not_scheduled(task), "Task '%s' has already been scheduled.", SD_task_get_name(task));
428 xbt_assert0(workstation_nb > 0, "workstation_nb must be positive");
430 task->workstation_nb = workstation_nb;
433 task->computation_amount = xbt_new0(double, workstation_nb);
434 memcpy(task->computation_amount, computation_amount, sizeof(double) * workstation_nb);
436 int communication_nb = workstation_nb * workstation_nb;
437 task->communication_amount = xbt_new0(double, communication_nb);
438 memcpy(task->communication_amount, communication_amount, sizeof(double) * communication_nb);
440 /* we have to create a Surf workstation array instead of the SimDag workstation array */
441 task->workstation_list = xbt_new0(void*, workstation_nb);
443 for (i = 0; i < workstation_nb; i++) {
444 task->workstation_list[i] = workstation_list[i]->surf_workstation;
447 /* update the task state */
448 if (xbt_dynar_length(task->tasks_before) == 0)
449 __SD_task_set_state(task, SD_READY);
451 __SD_task_set_state(task, SD_SCHEDULED);
455 * \brief Unschedules a task
457 * The task state must be #SD_SCHEDULED, #SD_READY, #SD_RUNNING or #SD_FAILED.
458 * If you call this function, the task state becomes #SD_NOT_SCHEDULED.
459 * Call SD_task_schedule() to schedule it again.
461 * \param task the task you want to unschedule
462 * \see SD_task_schedule()
464 void SD_task_unschedule(SD_task_t task) {
465 SD_CHECK_INIT_DONE();
466 xbt_assert0(task != NULL, "Invalid parameter");
467 xbt_assert1(task->state_set == sd_global->scheduled_task_set ||
468 task->state_set == sd_global->ready_task_set ||
469 task->state_set == sd_global->running_task_set ||
470 task->state_set == sd_global->failed_task_set,
471 "Task %s: the state must be SD_SCHEDULED, SD_READY, SD_RUNNING or SD_FAILED",
472 SD_task_get_name(task));
474 if (__SD_task_is_scheduled_or_ready(task)) /* if the task is scheduled or ready */
475 __SD_task_destroy_scheduling_data(task);
477 if (__SD_task_is_running(task)) /* the task should become SD_FAILED */
478 surf_workstation_resource->common_public->action_cancel(task->surf_action);
480 __SD_task_set_state(task, SD_NOT_SCHEDULED);
483 /* Runs a task. This function is called by SD_simulate when a scheduled task can start
484 * (ie when its dependencies are satisfied).
486 surf_action_t __SD_task_run(SD_task_t task) {
487 SD_CHECK_INIT_DONE();
488 xbt_assert0(task != NULL, "Invalid parameter");
489 xbt_assert2(__SD_task_is_ready(task), "Task '%s' is not ready! Task state: %d",
490 SD_task_get_name(task), SD_task_get_state(task));
492 surf_action_t surf_action = surf_workstation_resource->extension_public->
493 execute_parallel_task(task->workstation_nb,
494 task->workstation_list,
495 task->computation_amount,
496 task->communication_amount,
500 __SD_task_destroy_scheduling_data(task); /* now the scheduling data are not useful anymore */
501 __SD_task_set_state(task, SD_RUNNING);
505 /* Remove all dependencies associated with a task. This function is called when the task is destroyed.
507 static void __SD_task_remove_dependencies(SD_task_t task) {
508 /* we must destroy the dependencies carefuly (with SD_dependency_remove)
509 because each one is stored twice */
510 SD_dependency_t dependency;
511 while (xbt_dynar_length(task->tasks_before) > 0) {
512 xbt_dynar_get_cpy(task->tasks_before, 0, &dependency);
513 SD_task_dependency_remove(dependency->src, dependency->dst);
516 while (xbt_dynar_length(task->tasks_after) > 0) {
517 xbt_dynar_get_cpy(task->tasks_after, 0, &dependency);
518 SD_task_dependency_remove(dependency->src, dependency->dst);
523 * \brief Destroys a task.
525 * The user data (if any) should have been destroyed first.
527 * \param task the task you want to destroy
528 * \see SD_task_create()
530 void SD_task_destroy(SD_task_t task) {
531 SD_CHECK_INIT_DONE();
532 xbt_assert0(task != NULL, "Invalid parameter");
534 DEBUG1("Destroying task %s...", SD_task_get_name(task));
536 __SD_task_remove_dependencies(task);
538 /* if the task was scheduled or ready we have to free the scheduling parameters */
539 if (__SD_task_is_scheduled_or_ready(task))
540 __SD_task_destroy_scheduling_data(task);
542 if (task->name != NULL)
543 xbt_free(task->name);
545 xbt_dynar_free(&task->tasks_before);
546 xbt_dynar_free(&task->tasks_after);
549 DEBUG0("Task destroyed.");