2 #include "simdag/simdag.h"
3 #include "xbt/sysdep.h"
6 static void __SD_task_remove_dependencies(SD_task_t task);
9 * \brief Creates a new task.
11 * \param name the name of the task (can be \c NULL)
12 * \param data the user data you want to associate with the task (can be \c NULL)
13 * \return the new task
14 * \see SD_task_destroy()
16 SD_task_t SD_task_create(const char *name, void *data) {
19 SD_task_t task = xbt_new0(s_SD_task_t, 1);
21 /* general information */
22 task->data = data; /* user data */
24 task->name = xbt_strdup(name);
28 task->state_set = sd_global->not_scheduled_task_set;
29 xbt_swag_insert(task,task->state_set);
31 task->surf_action = NULL;
32 task->watch_points = 0;
33 task->state_changed = 0;
36 task->tasks_before = xbt_dynar_new(sizeof(SD_dependency_t), NULL);
37 task->tasks_after = xbt_dynar_new(sizeof(SD_dependency_t), NULL);
39 /* scheduling parameters */
40 task->workstation_nb = 0;
41 task->workstation_list = NULL;
42 task->computation_amount = NULL;
43 task->communication_amount = NULL;
50 * \brief Returns the user data of a task
53 * \return the user data associated with this task (can be \c NULL)
54 * \see SD_task_set_data()
56 void* SD_task_get_data(SD_task_t task) {
58 xbt_assert0(task != NULL, "Invalid parameter");
63 * \brief Sets the user data of a task
65 * The new data can be \c NULL. The old data should have been freed first
66 * if it was not \c NULL.
69 * \param data the new data you want to associate with this task
70 * \see SD_task_get_data()
72 void SD_task_set_data(SD_task_t task, void *data) {
74 xbt_assert0(task != NULL, "Invalid parameter");
79 * \brief Returns the state of a task
82 * \return the current \ref e_SD_task_state_t "state" of this task:
83 * #SD_NOT_SCHEDULED, #SD_SCHEDULED, #SD_READY, #SD_RUNNING, #SD_DONE or #SD_FAILED
84 * \see e_SD_task_state_t
86 e_SD_task_state_t SD_task_get_state(SD_task_t task) {
88 xbt_assert0(task != NULL, "Invalid parameter");
90 if (task->state_set == sd_global->scheduled_task_set)
92 if (task->state_set == sd_global->done_task_set)
94 if (task->state_set == sd_global->running_task_set)
96 if (task->state_set == sd_global->ready_task_set)
98 if (task->state_set == sd_global->not_scheduled_task_set)
99 return SD_NOT_SCHEDULED;
103 /* Changes the state of a task. Updates the swags and the flag sd_global->watch_point_reached.
105 void __SD_task_set_state(SD_task_t task, e_SD_task_state_t new_state) {
106 xbt_swag_remove(task, task->state_set);
108 case SD_NOT_SCHEDULED:
109 task->state_set = sd_global->not_scheduled_task_set;
112 task->state_set = sd_global->scheduled_task_set;
115 task->state_set = sd_global->ready_task_set;
118 task->state_set = sd_global->running_task_set;
121 task->state_set = sd_global->done_task_set;
124 task->state_set = sd_global->failed_task_set;
127 xbt_assert0(0, "Invalid state");
129 xbt_swag_insert(task, task->state_set);
131 if (task->watch_points & new_state) {
132 printf("Watch point reached with task '%s'!\n", SD_task_get_name(task));
133 sd_global->watch_point_reached = 1;
134 SD_task_unwatch(task, new_state); /* remove the watch point */
139 * \brief Returns the name of a task
142 * \return the name of this task (can be \c NULL)
144 const char* SD_task_get_name(SD_task_t task) {
145 SD_CHECK_INIT_DONE();
146 xbt_assert0(task != NULL, "Invalid parameter");
151 * \brief Returns the total amount of a task
154 * \return the total amount of this task
155 * \see SD_task_get_remaining_amount()
157 double SD_task_get_amount(SD_task_t task) {
158 SD_CHECK_INIT_DONE();
159 xbt_assert0(task != NULL, "Invalid parameter");
160 xbt_assert1(task->surf_action != NULL, "The task '%s' is not running", SD_task_get_name(task));
161 return task->surf_action->cost;
165 * \brief Returns the remaining amount of a task
168 * \return the remaining amount of this task
169 * \see SD_task_get_amount()
171 double SD_task_get_remaining_amount(SD_task_t task) {
172 SD_CHECK_INIT_DONE();
173 xbt_assert0(task != NULL, "Invalid parameter");
174 xbt_assert1(task->surf_action != NULL, "The task '%s' is not running", SD_task_get_name(task));
175 return task->surf_action->remains / task->surf_action->cost;
178 /* temporary function for debbuging */
179 static void __SD_print_dependencies(SD_task_t task) {
180 printf("The following tasks must be executed before %s:", SD_task_get_name(task));
181 xbt_dynar_t dynar = task->tasks_before;
182 int length = xbt_dynar_length(dynar);
184 SD_dependency_t dependency;
185 for (i = 0; i < length; i++) {
186 xbt_dynar_get_cpy(dynar, i, &dependency);
187 printf(" %s", SD_task_get_name(dependency->src));
190 printf("\nThe following tasks must be executed after %s:", SD_task_get_name(task));
192 dynar = task->tasks_after;
193 length = xbt_dynar_length(dynar);
194 for (i = 0; i < length; i++) {
195 xbt_dynar_get_cpy(dynar, i, &dependency);
196 printf(" %s", SD_task_get_name(dependency->dst));
198 printf("\n----------------------------\n");
201 /* Destroys a dependency between two tasks.
203 static void __SD_task_dependency_destroy(void *dependency) {
204 if (((SD_dependency_t) dependency)->name != NULL)
205 xbt_free(((SD_dependency_t) dependency)->name);
206 xbt_free(dependency);
210 * \brief Adds a dependency between two tasks
212 * \a dst will depend on \a src, ie \a dst will not start before \a src is finished.
213 * Their \ref e_SD_task_state_t "state" must be #SD_NOT_SCHEDULED, #SD_SCHEDULED or #SD_READY.
215 * \param name the name of the new dependency (can be \c NULL)
216 * \param data the user data you want to associate with this dependency (can be \c NULL)
217 * \param src the task which must be executed first
218 * \param dst the task you want to make depend on \a src
219 * \see SD_task_dependency_remove()
221 void SD_task_dependency_add(const char *name, void *data, SD_task_t src, SD_task_t dst) {
222 SD_CHECK_INIT_DONE();
223 xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
224 xbt_assert1(src != dst, "Cannot add a dependency between task '%s' and itself", SD_task_get_name(src));
225 xbt_assert1(__SD_task_is_not_scheduled(src) || __SD_task_is_scheduled_or_ready(src),
226 "Task '%s' must be SD_NOT_SCHEDULED, SD_SCHEDULED or SD_READY", SD_task_get_name(src));
227 xbt_assert1(__SD_task_is_not_scheduled(dst) || __SD_task_is_scheduled_or_ready(dst),
228 "Task '%s' must be SD_NOT_SCHEDULED, SD_SCHEDULED or SD_READY", SD_task_get_name(dst));
230 xbt_dynar_t dynar = src->tasks_after;
231 int length = xbt_dynar_length(dynar);
234 SD_dependency_t dependency;
235 for (i = 0; i < length && !found; i++) {
236 xbt_dynar_get_cpy(dynar, i, &dependency);
237 found = (dependency->dst == dst);
239 xbt_assert2(!found, "A dependency already exists between task '%s' and task '%s'",
240 SD_task_get_name(src), SD_task_get_name(dst));
242 dependency = xbt_new0(s_SD_dependency_t, 1);
245 dependency->name = xbt_strdup(name);
246 dependency->data = data;
247 dependency->src = src;
248 dependency->dst = dst;
250 /* src must be executed before dst */
251 xbt_dynar_push(src->tasks_after, &dependency);
252 xbt_dynar_push(dst->tasks_before, &dependency);
254 /* if the task was ready, then dst->tasks_before is not empty anymore,
255 so we must go back to state SD_SCHEDULED */
256 if (__SD_task_is_ready(dst)) {
257 printf("SD_task_dependency_add: %s was ready and becomes scheduled!\n", SD_task_get_name(dst));
258 __SD_task_set_state(dst, SD_SCHEDULED);
261 /* __SD_print_dependencies(src);
262 __SD_print_dependencies(dst); */
266 * \brief Remove a dependency between two tasks
269 * \param dst a task depending on \a src
270 * \see SD_task_dependency_add()
272 void SD_task_dependency_remove(SD_task_t src, SD_task_t dst) {
273 SD_CHECK_INIT_DONE();
274 xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
276 /* remove the dependency from src->tasks_after */
277 xbt_dynar_t dynar = src->tasks_after;
278 int length = xbt_dynar_length(dynar);
281 SD_dependency_t dependency;
282 for (i = 0; i < length && !found; i++) {
283 xbt_dynar_get_cpy(dynar, i, &dependency);
284 if (dependency->dst == dst) {
285 xbt_dynar_remove_at(dynar, i, NULL);
289 xbt_assert4(found, "No dependency found between task '%s' and '%s': task '%s' is not a successor of task '%s'",
290 SD_task_get_name(src), SD_task_get_name(dst), SD_task_get_name(dst), SD_task_get_name(src));
292 /* remove the dependency from dst->tasks_before */
293 dynar = dst->tasks_before;
294 length = xbt_dynar_length(dynar);
297 for (i = 0; i < length && !found; i++) {
298 xbt_dynar_get_cpy(dynar, i, &dependency);
299 if (dependency->src == src) {
300 xbt_dynar_remove_at(dynar, i, NULL);
301 __SD_task_dependency_destroy(dependency);
305 xbt_assert4(found, "SimDag error: task '%s' is a successor of '%s' but task '%s' is not a predecessor of task '%s'",
306 SD_task_get_name(dst), SD_task_get_name(src), SD_task_get_name(src), SD_task_get_name(dst)); /* should never happen... */
308 /* if the task was scheduled and dst->tasks_before is empty now, we can make it ready */
309 if (xbt_dynar_length(dst->tasks_before) == 0 && __SD_task_is_scheduled(dst))
310 __SD_task_set_state(dst, SD_READY);
312 /* __SD_print_dependencies(src);
313 __SD_print_dependencies(dst);*/
317 * \brief Returns the user data associated with a dependency between two tasks
320 * \param dst a task depending on \a src
321 * \return the user data associated with this dependency (can be \c NULL)
322 * \see SD_task_dependency_add()
324 void *SD_task_dependency_get_data(SD_task_t src, SD_task_t dst) {
325 SD_CHECK_INIT_DONE();
326 xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
328 xbt_dynar_t dynar = src->tasks_after;
329 int length = xbt_dynar_length(dynar);
332 SD_dependency_t dependency;
333 for (i = 0; i < length && !found; i++) {
334 xbt_dynar_get_cpy(dynar, i, &dependency);
335 found = (dependency->dst == dst);
337 xbt_assert2(found, "No dependency found between task '%s' and '%s'", SD_task_get_name(src), SD_task_get_name(dst));
338 return dependency->data;
341 /* temporary function for debugging */
342 static void __SD_print_watch_points(SD_task_t task) {
343 static const int state_masks[] = {SD_SCHEDULED, SD_RUNNING, SD_READY, SD_DONE, SD_FAILED};
344 static const char* state_names[] = {"scheduled", "running", "ready", "done", "failed"};
346 printf("Task '%s' watch points (%x): ", SD_task_get_name(task), task->watch_points);
349 for (i = 0; i < 5; i++) {
350 if (task->watch_points & state_masks[i])
351 printf("%s ", state_names[i]);
357 * \brief Adds a watch point to a task
359 * 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
360 * watch point is then automatically removed.
363 * \param state the \ref e_SD_task_state_t "state" you want to watch (cannot be #SD_NOT_SCHEDULED)
364 * \see SD_task_unwatch()
366 void SD_task_watch(SD_task_t task, e_SD_task_state_t state) {
367 SD_CHECK_INIT_DONE();
368 xbt_assert0(task != NULL, "Invalid parameter");
369 xbt_assert0(state != SD_NOT_SCHEDULED, "Cannot add a watch point for state SD_NOT_SCHEDULED");
371 task->watch_points = task->watch_points | state;
372 /* __SD_print_watch_points(task);*/
376 * \brief Removes a watch point from a task
379 * \param state the \ref e_SD_task_state_t "state" you no longer want to watch
380 * \see SD_task_watch()
382 void SD_task_unwatch(SD_task_t task, e_SD_task_state_t state) {
383 SD_CHECK_INIT_DONE();
384 xbt_assert0(task != NULL, "Invalid parameter");
385 xbt_assert0(state != SD_NOT_SCHEDULED, "Cannot have a watch point for state SD_NOT_SCHEDULED");
387 task->watch_points = task->watch_points & ~state;
388 /* __SD_print_watch_points(task);*/
391 /* Destroys the data memorised by SD_task_schedule. Task state must be SD_SCHEDULED or SD_READY.
393 static void __SD_task_destroy_scheduling_data(SD_task_t task) {
394 SD_CHECK_INIT_DONE();
395 xbt_assert1(__SD_task_is_scheduled_or_ready(task),
396 "Task '%s' must be SD_SCHEDULED or SD_READY", SD_task_get_name(task));
397 xbt_free(task->workstation_list);
398 xbt_free(task->computation_amount);
399 xbt_free(task->communication_amount);
403 * \brief Schedules a task
405 * The task state must be #SD_NOT_SCHEDULED.
406 * Once scheduled, a task will be executed as soon as possible in SD_simulate(),
407 * i.e. when its dependencies are satisfied.
409 * \param task the task you want to schedule
410 * \param workstation_nb number of workstations on which the task will be executed
411 * \param workstation_list the workstations on which the task will be executed
412 * \param computation_amount computation amount for each workstation
413 * \param communication_amount communication amount between each pair of workstations
414 * \param rate task execution speed rate
415 * \see SD_task_unschedule()
417 void SD_task_schedule(SD_task_t task, int workstation_nb,
418 const SD_workstation_t *workstation_list, const double *computation_amount,
419 const double *communication_amount, double rate) {
420 SD_CHECK_INIT_DONE();
421 xbt_assert0(task, "Invalid parameter");
422 xbt_assert1(__SD_task_is_not_scheduled(task), "Task '%s' has already been scheduled.", SD_task_get_name(task));
423 xbt_assert0(workstation_nb > 0, "workstation_nb must be positive");
425 task->workstation_nb = workstation_nb;
428 task->computation_amount = xbt_new0(double, workstation_nb);
429 memcpy(task->computation_amount, computation_amount, sizeof(double) * workstation_nb);
431 int communication_nb = workstation_nb * workstation_nb;
432 task->communication_amount = xbt_new0(double, communication_nb);
433 memcpy(task->communication_amount, communication_amount, sizeof(double) * communication_nb);
435 /* we have to create a Surf workstation array instead of the SimDag workstation array */
436 task->workstation_list = xbt_new0(void*, workstation_nb);
438 for (i = 0; i < workstation_nb; i++) {
439 task->workstation_list[i] = workstation_list[i]->surf_workstation;
442 /* update the task state */
443 if (xbt_dynar_length(task->tasks_before) == 0)
444 __SD_task_set_state(task, SD_READY);
446 __SD_task_set_state(task, SD_SCHEDULED);
450 * \brief Unschedules a task
452 * The task state must be #SD_SCHEDULED, #SD_READY, #SD_RUNNING or #SD_FAILED.
453 * If you call this function, the task state becomes #SD_NOT_SCHEDULED.
454 * Call SD_task_schedule() to schedule it again.
456 * \param task the task you want to unschedule
457 * \see SD_task_schedule()
459 void SD_task_unschedule(SD_task_t task) {
460 SD_CHECK_INIT_DONE();
461 xbt_assert0(task != NULL, "Invalid parameter");
462 xbt_assert1(task->state_set == sd_global->scheduled_task_set ||
463 task->state_set == sd_global->ready_task_set ||
464 task->state_set == sd_global->running_task_set ||
465 task->state_set == sd_global->failed_task_set,
466 "Task %s: the state must be SD_SCHEDULED, SD_READY, SD_RUNNING or SD_FAILED",
467 SD_task_get_name(task));
469 if (__SD_task_is_scheduled_or_ready(task)) /* if the task is scheduled or ready */
470 __SD_task_destroy_scheduling_data(task);
472 if (__SD_task_is_running(task)) /* the task should become SD_FAILED */
473 surf_workstation_resource->common_public->action_cancel(task->surf_action);
475 __SD_task_set_state(task, SD_NOT_SCHEDULED);
478 /* Runs a task. This function is called by SD_simulate when a scheduled task can start
479 * (ie when its dependencies are satisfied).
481 surf_action_t __SD_task_run(SD_task_t task) {
482 SD_CHECK_INIT_DONE();
483 xbt_assert0(task != NULL, "Invalid parameter");
484 xbt_assert2(__SD_task_is_ready(task), "Task '%s' is not ready! Task state: %d",
485 SD_task_get_name(task), SD_task_get_state(task));
487 surf_action_t surf_action = surf_workstation_resource->extension_public->
488 execute_parallel_task(task->workstation_nb,
489 task->workstation_list,
490 task->computation_amount,
491 task->communication_amount,
495 __SD_task_destroy_scheduling_data(task); /* now the scheduling data are not useful anymore */
496 __SD_task_set_state(task, SD_RUNNING);
500 /* Remove all dependencies associated with a task. This function is called when the task is destroyed.
502 static void __SD_task_remove_dependencies(SD_task_t task) {
503 /* we must destroy the dependencies carefuly (with SD_dependency_remove)
504 because each one is stored twice */
505 SD_dependency_t dependency;
506 while (xbt_dynar_length(task->tasks_before) > 0) {
507 xbt_dynar_get_cpy(task->tasks_before, 0, &dependency);
508 SD_task_dependency_remove(dependency->src, dependency->dst);
511 while (xbt_dynar_length(task->tasks_after) > 0) {
512 xbt_dynar_get_cpy(task->tasks_after, 0, &dependency);
513 SD_task_dependency_remove(dependency->src, dependency->dst);
518 * \brief Destroys a task.
520 * The user data (if any) should have been destroyed first.
522 * \param task the task you want to destroy
523 * \see SD_task_create()
525 void SD_task_destroy(SD_task_t task) {
526 SD_CHECK_INIT_DONE();
527 xbt_assert0(task != NULL, "Invalid parameter");
529 /*printf("Destroying task %s...\n", SD_task_get_name(task));*/
531 __SD_task_remove_dependencies(task);
533 /* if the task was scheduled or ready we have to free the scheduling parameters */
534 if (__SD_task_is_scheduled_or_ready(task))
535 __SD_task_destroy_scheduling_data(task);
537 if (task->name != NULL)
538 xbt_free(task->name);
540 xbt_dynar_free(&task->tasks_before);
541 xbt_dynar_free(&task->tasks_after);
544 /*printf("Task destroyed.\n");*/