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 * \param amount the computing amount necessary to do this task
14 * \return the new task
15 * \see SD_task_destroy()
17 SD_task_t SD_task_create(const char *name, void *data, double amount) {
19 xbt_assert0(amount > 0, "amount must be positive");
21 SD_task_t task = xbt_new0(s_SD_task_t, 1);
23 /* general information */
24 task->data = data; /* user data */
26 task->name = xbt_strdup(name);
30 task->state_set = sd_global->not_scheduled_task_set;
31 xbt_swag_insert(task,task->state_set);
33 task->amount = amount;
34 task->surf_action = NULL;
35 task->watch_points = 0;
36 task->state_changed = 0;
39 task->tasks_before = xbt_dynar_new(sizeof(SD_dependency_t), NULL);
40 task->tasks_after = xbt_dynar_new(sizeof(SD_dependency_t), NULL);
42 /* scheduling parameters */
43 task->workstation_nb = 0;
44 task->workstation_list = NULL;
45 task->computation_amount = NULL;
46 task->communication_amount = NULL;
53 * \brief Returns the user data of a task
56 * \return the user data associated with this task (can be \c NULL)
57 * \see SD_task_set_data()
59 void* SD_task_get_data(SD_task_t task) {
61 xbt_assert0(task != NULL, "Invalid parameter");
66 * \brief Sets the user data of a task
68 * The new data can be \c NULL. The old data should have been freed first
69 * if it was not \c NULL.
72 * \param data the new data you want to associate with this task
73 * \see SD_task_get_data()
75 void SD_task_set_data(SD_task_t task, void *data) {
77 xbt_assert0(task != NULL, "Invalid parameter");
82 * \brief Returns the state of a task
85 * \return the current \ref e_SD_task_state_t "state" of this task:
86 * #SD_NOT_SCHEDULED, #SD_SCHEDULED, #SD_READY, #SD_RUNNING, #SD_DONE or #SD_FAILED
87 * \see e_SD_task_state_t
89 e_SD_task_state_t SD_task_get_state(SD_task_t task) {
91 xbt_assert0(task != NULL, "Invalid parameter");
93 if (task->state_set == sd_global->scheduled_task_set)
95 if (task->state_set == sd_global->done_task_set)
97 if (task->state_set == sd_global->running_task_set)
99 if (task->state_set == sd_global->ready_task_set)
101 if (task->state_set == sd_global->not_scheduled_task_set)
102 return SD_NOT_SCHEDULED;
106 /* Changes the state of a task. Updates the swags and the flag sd_global->watch_point_reached.
108 void __SD_task_set_state(SD_task_t task, e_SD_task_state_t new_state) {
109 xbt_swag_remove(task, task->state_set);
111 case SD_NOT_SCHEDULED:
112 task->state_set = sd_global->not_scheduled_task_set;
115 task->state_set = sd_global->scheduled_task_set;
118 task->state_set = sd_global->ready_task_set;
121 task->state_set = sd_global->running_task_set;
124 task->state_set = sd_global->done_task_set;
127 task->state_set = sd_global->failed_task_set;
130 xbt_assert0(0, "Invalid state");
132 xbt_swag_insert(task, task->state_set);
134 if (task->watch_points & new_state) {
135 printf("Watch point reached with task '%s'!\n", SD_task_get_name(task));
136 sd_global->watch_point_reached = 1;
137 SD_task_unwatch(task, new_state); /* remove the watch point */
142 * \brief Returns the name of a task
145 * \return the name of this task (can be \c NULL)
147 const char* SD_task_get_name(SD_task_t task) {
148 SD_CHECK_INIT_DONE();
149 xbt_assert0(task != NULL, "Invalid parameter");
154 * \brief Returns the computing amount of a task
157 * \return the total computing amount of this task
158 * \see SD_task_get_remaining_amount()
160 double SD_task_get_amount(SD_task_t task) {
161 SD_CHECK_INIT_DONE();
162 xbt_assert0(task != NULL, "Invalid parameter");
167 * \brief Returns the remaining computing amount of a task
170 * \return the remaining computing amount of this task
171 * \see SD_task_get_amount()
173 double SD_task_get_remaining_amount(SD_task_t task) {
174 SD_CHECK_INIT_DONE();
175 xbt_assert0(task != NULL, "Invalid parameter");
177 if (task->surf_action)
180 return task->surf_action->remains;
183 /* temporary function for debbuging */
184 static void __SD_print_dependencies(SD_task_t task) {
185 printf("The following tasks must be executed before %s:", SD_task_get_name(task));
186 xbt_dynar_t dynar = task->tasks_before;
187 int length = xbt_dynar_length(dynar);
189 SD_dependency_t dependency;
190 for (i = 0; i < length; i++) {
191 xbt_dynar_get_cpy(dynar, i, &dependency);
192 printf(" %s", SD_task_get_name(dependency->src));
195 printf("\nThe following tasks must be executed after %s:", SD_task_get_name(task));
197 dynar = task->tasks_after;
198 length = xbt_dynar_length(dynar);
199 for (i = 0; i < length; i++) {
200 xbt_dynar_get_cpy(dynar, i, &dependency);
201 printf(" %s", SD_task_get_name(dependency->dst));
203 printf("\n----------------------------\n");
206 /* Destroys a dependency between two tasks.
208 static void __SD_task_dependency_destroy(void *dependency) {
209 if (((SD_dependency_t) dependency)->name != NULL)
210 xbt_free(((SD_dependency_t) dependency)->name);
211 xbt_free(dependency);
215 * \brief Adds a dependency between two tasks
217 * \a dst will depend on \a src, ie \a dst will not start before \a src is finished.
218 * Their \ref e_SD_task_state_t "state" must be #SD_NOT_SCHEDULED, #SD_SCHEDULED or #SD_READY.
220 * \param name the name of the new dependency (can be \c NULL)
221 * \param data the user data you want to associate with this dependency (can be \c NULL)
222 * \param src the task which must be executed first
223 * \param dst the task you want to make depend on \a src
224 * \see SD_task_dependency_remove()
226 void SD_task_dependency_add(const char *name, void *data, SD_task_t src, SD_task_t dst) {
227 SD_CHECK_INIT_DONE();
228 xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
229 xbt_assert1(src != dst, "Cannot add a dependency between task '%s' and itself", SD_task_get_name(src));
230 xbt_assert1(__SD_task_is_not_scheduled(src) || __SD_task_is_scheduled_or_ready(src),
231 "Task '%s' must be SD_NOT_SCHEDULED, SD_SCHEDULED or SD_READY", SD_task_get_name(src));
232 xbt_assert1(__SD_task_is_not_scheduled(dst) || __SD_task_is_scheduled_or_ready(dst),
233 "Task '%s' must be SD_NOT_SCHEDULED, SD_SCHEDULED or SD_READY", SD_task_get_name(dst));
235 xbt_dynar_t dynar = src->tasks_after;
236 int length = xbt_dynar_length(dynar);
239 SD_dependency_t dependency;
240 for (i = 0; i < length && !found; i++) {
241 xbt_dynar_get_cpy(dynar, i, &dependency);
242 found = (dependency->dst == dst);
244 xbt_assert2(!found, "A dependency already exists between task '%s' and task '%s'",
245 SD_task_get_name(src), SD_task_get_name(dst));
247 dependency = xbt_new0(s_SD_dependency_t, 1);
250 dependency->name = xbt_strdup(name);
251 dependency->data = data;
252 dependency->src = src;
253 dependency->dst = dst;
255 /* src must be executed before dst */
256 xbt_dynar_push(src->tasks_after, &dependency);
257 xbt_dynar_push(dst->tasks_before, &dependency);
259 /* if the task was ready, then dst->tasks_before is not empty anymore,
260 so we must go back to state SD_SCHEDULED */
261 if (__SD_task_is_ready(dst)) {
262 printf("SD_task_dependency_add: %s was ready and becomes scheduled!\n", SD_task_get_name(dst));
263 __SD_task_set_state(dst, SD_SCHEDULED);
266 /* __SD_print_dependencies(src);
267 __SD_print_dependencies(dst); */
271 * \brief Remove a dependency between two tasks
274 * \param dst a task depending on \a src
275 * \see SD_task_dependency_add()
277 void SD_task_dependency_remove(SD_task_t src, SD_task_t dst) {
278 SD_CHECK_INIT_DONE();
279 xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
281 /* remove the dependency from src->tasks_after */
282 xbt_dynar_t dynar = src->tasks_after;
283 int length = xbt_dynar_length(dynar);
286 SD_dependency_t dependency;
287 for (i = 0; i < length && !found; i++) {
288 xbt_dynar_get_cpy(dynar, i, &dependency);
289 if (dependency->dst == dst) {
290 xbt_dynar_remove_at(dynar, i, NULL);
294 xbt_assert4(found, "No dependency found between task '%s' and '%s': task '%s' is not a successor of task '%s'",
295 SD_task_get_name(src), SD_task_get_name(dst), SD_task_get_name(dst), SD_task_get_name(src));
297 /* remove the dependency from dst->tasks_before */
298 dynar = dst->tasks_before;
299 length = xbt_dynar_length(dynar);
302 for (i = 0; i < length && !found; i++) {
303 xbt_dynar_get_cpy(dynar, i, &dependency);
304 if (dependency->src == src) {
305 xbt_dynar_remove_at(dynar, i, NULL);
306 __SD_task_dependency_destroy(dependency);
310 xbt_assert4(found, "SimDag error: task '%s' is a successor of '%s' but task '%s' is not a predecessor of task '%s'",
311 SD_task_get_name(dst), SD_task_get_name(src), SD_task_get_name(src), SD_task_get_name(dst)); /* should never happen... */
313 /* if the task was scheduled and dst->tasks_before is empty now, we can make it ready */
314 if (xbt_dynar_length(dst->tasks_before) == 0 && __SD_task_is_scheduled(dst))
315 __SD_task_set_state(dst, SD_READY);
317 /* __SD_print_dependencies(src);
318 __SD_print_dependencies(dst);*/
322 * \brief Returns the user data associated with a dependency between two tasks
325 * \param dst a task depending on \a src
326 * \return the user data associated with this dependency (can be \c NULL)
327 * \see SD_task_dependency_add()
329 void *SD_task_dependency_get_data(SD_task_t src, SD_task_t dst) {
330 SD_CHECK_INIT_DONE();
331 xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
333 xbt_dynar_t dynar = src->tasks_after;
334 int length = xbt_dynar_length(dynar);
337 SD_dependency_t dependency;
338 for (i = 0; i < length && !found; i++) {
339 xbt_dynar_get_cpy(dynar, i, &dependency);
340 found = (dependency->dst == dst);
342 xbt_assert2(found, "No dependency found between task '%s' and '%s'", SD_task_get_name(src), SD_task_get_name(dst));
343 return dependency->data;
346 /* temporary function for debugging */
347 static void __SD_print_watch_points(SD_task_t task) {
348 static const int state_masks[] = {SD_SCHEDULED, SD_RUNNING, SD_READY, SD_DONE, SD_FAILED};
349 static const char* state_names[] = {"scheduled", "running", "ready", "done", "failed"};
351 printf("Task '%s' watch points (%x): ", SD_task_get_name(task), task->watch_points);
354 for (i = 0; i < 5; i++) {
355 if (task->watch_points & state_masks[i])
356 printf("%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, double *computation_amount,
424 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 /*printf("Destroying task %s...\n", 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 /*printf("Task destroyed.\n");*/