5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1998 - 2007 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; version 2 of the License.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
23 /************************** Types and definitions ***************************/
25 /* Platform specific implementation */
26 extern const SilcScheduleOps schedule_ops;
28 static void silc_schedule_task_remove(SilcSchedule schedule, SilcTask task);
29 static void silc_schedule_dispatch_fd(SilcSchedule schedule);
30 static void silc_schedule_dispatch_timeout(SilcSchedule schedule,
31 SilcBool dispatch_all);
34 /************************ Static utility functions **************************/
36 /* Fd task hash table destructor */
38 static void silc_schedule_fd_destructor(void *key, void *context,
44 /* Executes file descriptor tasks. Invalid tasks are removed here. */
46 static void silc_schedule_dispatch_fd(SilcSchedule schedule)
51 /* The dispatch list includes only valid tasks, and tasks that have
52 something to dispatch. Dispatching is atomic; no matter if another
53 thread invalidates a task when we unlock, we dispatch to completion. */
54 SILC_SCHEDULE_UNLOCK(schedule);
55 silc_list_start(schedule->fd_dispatch);
56 while ((task = silc_list_get(schedule->fd_dispatch))) {
59 /* Is the task ready for reading */
60 if (task->revents & SILC_TASK_READ)
61 t->callback(schedule, schedule->app_context, SILC_TASK_READ,
62 task->fd, t->context);
64 /* Is the task ready for writing */
65 if (t->valid && task->revents & SILC_TASK_WRITE)
66 t->callback(schedule, schedule->app_context, SILC_TASK_WRITE,
67 task->fd, t->context);
69 SILC_SCHEDULE_LOCK(schedule);
71 /* Remove invalidated tasks */
72 silc_list_start(schedule->fd_dispatch);
73 while ((task = silc_list_get(schedule->fd_dispatch)))
74 if (silc_unlikely(!task->header.valid))
75 silc_schedule_task_remove(schedule, (SilcTask)task);
78 /* Executes all tasks whose timeout has expired. The task is removed from
79 the task queue after the callback function has returned. Also, invalid
80 tasks are removed here. */
82 static void silc_schedule_dispatch_timeout(SilcSchedule schedule,
83 SilcBool dispatch_all)
87 struct timeval curtime;
90 SILC_LOG_DEBUG(("Running timeout tasks"));
92 silc_gettimeofday(&curtime);
94 /* First task in the task queue has always the earliest timeout. */
95 silc_list_start(schedule->timeout_queue);
96 task = silc_list_get(schedule->timeout_queue);
97 if (silc_unlikely(!task))
102 /* Remove invalid task */
103 if (silc_unlikely(!t->valid)) {
104 silc_schedule_task_remove(schedule, t);
108 /* Execute the task if the timeout has expired */
109 if (silc_compare_timeval(&task->timeout, &curtime) > 0 && !dispatch_all)
113 SILC_SCHEDULE_UNLOCK(schedule);
114 t->callback(schedule, schedule->app_context, SILC_TASK_EXPIRE, 0,
116 SILC_SCHEDULE_LOCK(schedule);
118 /* Remove the expired task */
119 silc_schedule_task_remove(schedule, t);
121 /* Balance when we have lots of small timeouts */
122 if (silc_unlikely((++count) > 40))
124 } while (silc_likely((task = silc_list_get(schedule->timeout_queue))));
127 /* Calculates next timeout. This is the timeout value when at earliest some
128 of the timeout tasks expire. If this is in the past, they will be
131 static void silc_schedule_select_timeout(SilcSchedule schedule)
134 SilcTaskTimeout task;
135 struct timeval curtime;
136 SilcBool dispatch = TRUE;
138 /* Get the current time */
139 silc_gettimeofday(&curtime);
140 schedule->has_timeout = FALSE;
142 /* First task in the task queue has always the earliest timeout. */
143 silc_list_start(schedule->timeout_queue);
144 task = silc_list_get(schedule->timeout_queue);
145 if (silc_unlikely(!task))
150 /* Remove invalid task */
151 if (silc_unlikely(!t->valid)) {
152 silc_schedule_task_remove(schedule, t);
156 /* If the timeout is in past, we will run the task and all other
157 timeout tasks from the past. */
158 if (silc_compare_timeval(&task->timeout, &curtime) <= 0 && dispatch) {
159 silc_schedule_dispatch_timeout(schedule, FALSE);
160 if (silc_unlikely(!schedule->valid))
163 /* Start selecting new timeout again after dispatch */
164 silc_list_start(schedule->timeout_queue);
169 /* Calculate the next timeout */
170 curtime.tv_sec = task->timeout.tv_sec - curtime.tv_sec;
171 curtime.tv_usec = task->timeout.tv_usec - curtime.tv_usec;
172 if (curtime.tv_sec < 0)
175 /* We wouldn't want to go under zero, check for it. */
176 if (curtime.tv_usec < 0) {
178 if (curtime.tv_sec < 0)
180 curtime.tv_usec += 1000000L;
183 } while ((task = silc_list_get(schedule->timeout_queue)));
185 /* Save the timeout */
187 schedule->timeout = curtime;
188 schedule->has_timeout = TRUE;
189 SILC_LOG_DEBUG(("timeout: sec=%d, usec=%d", schedule->timeout.tv_sec,
190 schedule->timeout.tv_usec));
194 /* Removes task from the scheduler. This must be called with scheduler
197 static void silc_schedule_task_remove(SilcSchedule schedule, SilcTask task)
201 if (silc_unlikely(task == SILC_ALL_TASKS)) {
203 SilcHashTableList htl;
206 /* Delete from fd queue */
207 silc_hash_table_list(schedule->fd_queue, &htl);
208 while (silc_hash_table_get(&htl, (void *)&fd, (void *)&task))
209 silc_hash_table_del(schedule->fd_queue, SILC_32_TO_PTR(fd));
210 silc_hash_table_list_reset(&htl);
212 /* Delete from timeout queue */
213 silc_list_start(schedule->timeout_queue);
214 while ((task = silc_list_get(schedule->timeout_queue))) {
215 silc_list_del(schedule->timeout_queue, task);
222 if (silc_likely(task->type == 1)) {
223 /* Delete from timeout queue */
224 silc_list_del(schedule->timeout_queue, task);
226 /* Put to free list */
227 silc_list_add(schedule->free_tasks, task);
229 /* Delete from fd queue */
230 ftask = (SilcTaskFd)task;
231 silc_hash_table_del(schedule->fd_queue, SILC_32_TO_PTR(ftask->fd));
235 /* Timeout freelist garbage collection */
237 SILC_TASK_CALLBACK(silc_schedule_timeout_gc)
242 if (!schedule->valid)
245 SILC_LOG_DEBUG(("Timeout freelist garbage collection"));
247 SILC_SCHEDULE_LOCK(schedule);
249 if (silc_list_count(schedule->free_tasks) <= 10) {
250 SILC_SCHEDULE_UNLOCK(schedule);
251 silc_schedule_task_add_timeout(schedule, silc_schedule_timeout_gc,
255 if (silc_list_count(schedule->timeout_queue) >
256 silc_list_count(schedule->free_tasks)) {
257 SILC_SCHEDULE_UNLOCK(schedule);
258 silc_schedule_task_add_timeout(schedule, silc_schedule_timeout_gc,
263 c = silc_list_count(schedule->free_tasks) / 2;
264 if (c > silc_list_count(schedule->timeout_queue))
265 c = (silc_list_count(schedule->free_tasks) -
266 silc_list_count(schedule->timeout_queue));
267 if (silc_list_count(schedule->free_tasks) - c < 10)
268 c -= (10 - (silc_list_count(schedule->free_tasks) - c));
270 SILC_LOG_DEBUG(("Freeing %d unused tasks, leaving %d", c,
271 silc_list_count(schedule->free_tasks) - c));
273 silc_list_start(schedule->free_tasks);
274 while ((t = silc_list_get(schedule->free_tasks)) && c-- > 0) {
275 silc_list_del(schedule->free_tasks, t);
278 silc_list_start(schedule->free_tasks);
280 SILC_SCHEDULE_UNLOCK(schedule);
282 silc_schedule_task_add_timeout(schedule, silc_schedule_timeout_gc,
286 #ifdef SILC_DIST_INPLACE
287 /* Print schedule statistics to stdout */
289 void silc_schedule_stats(SilcSchedule schedule)
292 fprintf(stdout, "Schedule %p statistics:\n\n", schedule);
293 fprintf(stdout, "Num FD tasks : %lu (%lu bytes allocated)\n",
294 silc_hash_table_count(schedule->fd_queue),
295 sizeof(*ftask) * silc_hash_table_count(schedule->fd_queue));
296 fprintf(stdout, "Num Timeout tasks : %d (%d bytes allocated)\n",
297 silc_list_count(schedule->timeout_queue),
298 sizeof(struct SilcTaskTimeoutStruct) *
299 silc_list_count(schedule->timeout_queue));
300 fprintf(stdout, "Num Timeout freelist : %d (%d bytes allocated)\n",
301 silc_list_count(schedule->free_tasks),
302 sizeof(struct SilcTaskTimeoutStruct) *
303 silc_list_count(schedule->free_tasks));
305 #endif /* SILC_DIST_INPLACE */
307 /****************************** Public API **********************************/
309 /* Initializes the scheduler. This returns the scheduler context that
310 is given as arugment usually to all silc_schedule_* functions.
311 The `max_tasks' indicates the number of maximum tasks that the
312 scheduler can handle. The `app_context' is application specific
313 context that is delivered to task callbacks. */
315 SilcSchedule silc_schedule_init(int max_tasks, void *app_context)
317 SilcSchedule schedule;
319 SILC_LOG_DEBUG(("Initializing scheduler"));
321 schedule = silc_calloc(1, sizeof(*schedule));
326 silc_hash_table_alloc(0, silc_hash_uint, NULL, NULL, NULL,
327 silc_schedule_fd_destructor, NULL, TRUE);
328 if (!schedule->fd_queue) {
333 silc_list_init(schedule->timeout_queue, struct SilcTaskStruct, next);
334 silc_list_init(schedule->free_tasks, struct SilcTaskStruct, next);
336 schedule->app_context = app_context;
337 schedule->valid = TRUE;
338 schedule->max_tasks = max_tasks;
340 /* Allocate scheduler lock */
341 silc_mutex_alloc(&schedule->lock);
343 /* Initialize the platform specific scheduler. */
344 schedule->internal = schedule_ops.init(schedule, app_context);
345 if (!schedule->internal) {
346 silc_hash_table_free(schedule->fd_queue);
347 silc_mutex_free(schedule->lock);
352 /* Timeout freelist garbage collection */
353 silc_schedule_task_add_timeout(schedule, silc_schedule_timeout_gc,
359 /* Uninitializes the schedule. This is called when the program is ready
360 to end. This removes all tasks and task queues. Returns FALSE if the
361 scheduler could not be uninitialized. This happens when the scheduler
362 is still valid and silc_schedule_stop has not been called. */
364 SilcBool silc_schedule_uninit(SilcSchedule schedule)
368 SILC_LOG_DEBUG(("Uninitializing scheduler"));
370 if (schedule->valid == TRUE)
373 /* Dispatch all timeouts before going away */
374 SILC_SCHEDULE_LOCK(schedule);
375 silc_schedule_dispatch_timeout(schedule, TRUE);
376 SILC_SCHEDULE_UNLOCK(schedule);
378 /* Deliver signals before going away */
379 if (schedule->signal_tasks) {
380 schedule_ops.signals_call(schedule, schedule->internal);
381 schedule->signal_tasks = FALSE;
384 /* Unregister all tasks */
385 silc_schedule_task_del(schedule, SILC_ALL_TASKS);
386 silc_schedule_task_remove(schedule, SILC_ALL_TASKS);
388 /* Delete timeout task freelist */
389 silc_list_start(schedule->free_tasks);
390 while ((task = silc_list_get(schedule->free_tasks)))
393 /* Unregister all task queues */
394 silc_hash_table_free(schedule->fd_queue);
396 /* Uninit the platform specific scheduler. */
397 schedule_ops.uninit(schedule, schedule->internal);
399 silc_mutex_free(schedule->lock);
405 /* Stops the schedule even if it is not supposed to be stopped yet.
406 After calling this, one should call silc_schedule_uninit (after the
407 silc_schedule has returned). */
409 void silc_schedule_stop(SilcSchedule schedule)
411 SILC_LOG_DEBUG(("Stopping scheduler"));
412 SILC_SCHEDULE_LOCK(schedule);
413 schedule->valid = FALSE;
414 SILC_SCHEDULE_UNLOCK(schedule);
417 /* Runs the scheduler once and then returns. Must be called locked. */
419 static SilcBool silc_schedule_iterate(SilcSchedule schedule, int timeout_usecs)
421 struct timeval timeout;
425 SILC_LOG_DEBUG(("In scheduler loop"));
427 /* Deliver signals if any has been set to be called */
428 if (silc_unlikely(schedule->signal_tasks)) {
429 SILC_SCHEDULE_UNLOCK(schedule);
430 schedule_ops.signals_call(schedule, schedule->internal);
431 schedule->signal_tasks = FALSE;
432 SILC_SCHEDULE_LOCK(schedule);
435 /* Check if scheduler is valid */
436 if (silc_unlikely(schedule->valid == FALSE)) {
437 SILC_LOG_DEBUG(("Scheduler not valid anymore, exiting"));
441 /* Calculate next timeout for silc_select(). This is the timeout value
442 when at earliest some of the timeout tasks expire. This may dispatch
443 already expired timeouts. */
444 silc_schedule_select_timeout(schedule);
446 /* Check if scheduler is valid */
447 if (silc_unlikely(schedule->valid == FALSE)) {
448 SILC_LOG_DEBUG(("Scheduler not valid anymore, exiting"));
452 if (timeout_usecs >= 0) {
454 timeout.tv_usec = timeout_usecs;
455 schedule->timeout = timeout;
456 schedule->has_timeout = TRUE;
459 /* This is the main silc_select(). The program blocks here until some
460 of the selected file descriptors change status or the selected
462 SILC_LOG_DEBUG(("Select"));
463 ret = schedule_ops.schedule(schedule, schedule->internal);
465 if (silc_likely(ret == 0)) {
467 SILC_LOG_DEBUG(("Running timeout tasks"));
468 if (silc_likely(silc_list_count(schedule->timeout_queue)))
469 silc_schedule_dispatch_timeout(schedule, FALSE);
472 } else if (silc_likely(ret > 0)) {
473 /* There is some data available now */
474 SILC_LOG_DEBUG(("Running fd tasks"));
475 silc_schedule_dispatch_fd(schedule);
479 /* Error or special case handling */
485 SILC_LOG_ERROR(("Error in select()/poll(): %s", strerror(errno)));
488 } while (timeout_usecs == -1);
493 /* Runs the scheduler once and then returns. */
495 SilcBool silc_schedule_one(SilcSchedule schedule, int timeout_usecs)
498 SILC_SCHEDULE_LOCK(schedule);
499 ret = silc_schedule_iterate(schedule, timeout_usecs);
500 SILC_SCHEDULE_UNLOCK(schedule);
504 /* Runs the scheduler and blocks here. When this returns the scheduler
508 void silc_schedule(SilcSchedule schedule)
510 SILC_LOG_DEBUG(("Running scheduler"));
512 /* Start the scheduler loop */
513 SILC_SCHEDULE_LOCK(schedule);
514 silc_schedule_iterate(schedule, -1);
515 SILC_SCHEDULE_UNLOCK(schedule);
517 #endif /* !SILC_SYMBIAN */
519 /* Wakes up the scheduler. This is used only in multi-threaded
520 environments where threads may add new tasks or remove old tasks
521 from task queues. This is called to wake up the scheduler in the
522 main thread so that it detects the changes in the task queues.
523 If threads support is not compiled in this function has no effect.
524 Implementation of this function is platform specific. */
526 void silc_schedule_wakeup(SilcSchedule schedule)
529 SILC_LOG_DEBUG(("Wakeup scheduler"));
530 SILC_SCHEDULE_LOCK(schedule);
531 schedule_ops.wakeup(schedule, schedule->internal);
532 SILC_SCHEDULE_UNLOCK(schedule);
536 /* Returns the application specific context that was saved into the
537 scheduler in silc_schedule_init function. The context is also
538 returned to application in task callback functions, but this function
539 may be used to get it as well if needed. */
541 void *silc_schedule_get_context(SilcSchedule schedule)
543 return schedule->app_context;
546 /* Add new task to the scheduler */
548 SilcTask silc_schedule_task_add(SilcSchedule schedule, SilcUInt32 fd,
549 SilcTaskCallback callback, void *context,
550 long seconds, long useconds,
553 SilcTask task = NULL;
555 if (silc_unlikely(!schedule->valid))
558 SILC_SCHEDULE_LOCK(schedule);
560 if (silc_likely(type == SILC_TASK_TIMEOUT)) {
561 SilcTaskTimeout tmp, prev, ttask;
564 silc_list_start(schedule->free_tasks);
565 ttask = silc_list_get(schedule->free_tasks);
566 if (silc_unlikely(!ttask)) {
567 ttask = silc_calloc(1, sizeof(*ttask));
568 if (silc_unlikely(!ttask))
571 silc_list_del(schedule->free_tasks, ttask);
573 ttask->header.type = 1;
574 ttask->header.callback = callback;
575 ttask->header.context = context;
576 ttask->header.valid = TRUE;
579 silc_gettimeofday(&ttask->timeout);
580 if ((seconds + useconds) > 0) {
581 ttask->timeout.tv_sec += seconds + (useconds / 1000000L);
582 ttask->timeout.tv_usec += (useconds % 1000000L);
583 if (ttask->timeout.tv_usec >= 1000000L) {
584 ttask->timeout.tv_sec += 1;
585 ttask->timeout.tv_usec -= 1000000L;
589 SILC_LOG_DEBUG(("New timeout task %p: sec=%d, usec=%d", ttask,
592 /* Add task to correct spot so that the first task in the list has
593 the earliest timeout. */
594 list = schedule->timeout_queue;
595 silc_list_start(list);
597 while ((tmp = silc_list_get(list)) != SILC_LIST_END) {
598 /* If we have shorter timeout, we have found our spot */
599 if (silc_compare_timeval(&ttask->timeout, &tmp->timeout) < 0) {
600 silc_list_insert(schedule->timeout_queue, prev, ttask);
606 silc_list_add(schedule->timeout_queue, ttask);
608 task = (SilcTask)ttask;
610 } else if (silc_likely(type == SILC_TASK_FD)) {
613 /* Check if fd is already added */
614 if (silc_unlikely(silc_hash_table_find(schedule->fd_queue,
616 NULL, (void *)&task))) {
620 /* Remove invalid task. We must have unique fd key to hash table. */
621 silc_schedule_task_remove(schedule, task);
624 /* Check max tasks */
625 if (silc_unlikely(schedule->max_tasks > 0 &&
626 silc_hash_table_count(schedule->fd_queue) >=
627 schedule->max_tasks)) {
628 SILC_LOG_WARNING(("Scheduler task limit reached: cannot add new task"));
633 ftask = silc_calloc(1, sizeof(*ftask));
634 if (silc_unlikely(!ftask)) {
639 SILC_LOG_DEBUG(("New fd task %p fd=%d", ftask, fd));
641 ftask->header.type = 0;
642 ftask->header.callback = callback;
643 ftask->header.context = context;
644 ftask->header.valid = TRUE;
645 ftask->events = SILC_TASK_READ;
648 /* Add task and schedule it */
649 if (!silc_hash_table_add(schedule->fd_queue, SILC_32_TO_PTR(fd), ftask)) {
654 if (!schedule_ops.schedule_fd(schedule, schedule->internal,
655 ftask, ftask->events)) {
656 silc_hash_table_del(schedule->fd_queue, SILC_32_TO_PTR(fd));
661 task = (SilcTask)ftask;
663 } else if (silc_unlikely(type == SILC_TASK_SIGNAL)) {
664 SILC_SCHEDULE_UNLOCK(schedule);
665 schedule_ops.signal_register(schedule, schedule->internal, fd,
671 SILC_SCHEDULE_UNLOCK(schedule);
674 /* On symbian we wakeup scheduler immediately after adding timeout task
675 in case the task is added outside the scheduler loop (in some active
677 if (task && task->type == 1)
678 silc_schedule_wakeup(schedule);
679 #endif /* SILC_SYMBIAN */
684 /* Invalidates task */
686 SilcBool silc_schedule_task_del(SilcSchedule schedule, SilcTask task)
688 if (silc_unlikely(task == SILC_ALL_TASKS)) {
689 SilcHashTableList htl;
691 SILC_LOG_DEBUG(("Unregister all tasks"));
693 SILC_SCHEDULE_LOCK(schedule);
695 /* Delete from fd queue */
696 silc_hash_table_list(schedule->fd_queue, &htl);
697 while (silc_hash_table_get(&htl, NULL, (void *)&task))
699 silc_hash_table_list_reset(&htl);
701 /* Delete from timeout queue */
702 silc_list_start(schedule->timeout_queue);
703 while ((task = (SilcTask)silc_list_get(schedule->timeout_queue))
707 SILC_SCHEDULE_UNLOCK(schedule);
711 SILC_LOG_DEBUG(("Unregistering task %p", task));
712 SILC_SCHEDULE_LOCK(schedule);
714 SILC_SCHEDULE_UNLOCK(schedule);
719 /* Invalidate task by fd */
721 SilcBool silc_schedule_task_del_by_fd(SilcSchedule schedule, SilcUInt32 fd)
723 SilcTask task = NULL;
724 SilcBool ret = FALSE;
726 SILC_LOG_DEBUG(("Unregister task by fd %d", fd));
728 SILC_SCHEDULE_LOCK(schedule);
730 /* fd is unique, so there is only one task with this fd in the table */
731 if (silc_likely(silc_hash_table_find(schedule->fd_queue,
732 SILC_32_TO_PTR(fd), NULL,
734 SILC_LOG_DEBUG(("Deleting task %p", task));
739 SILC_SCHEDULE_UNLOCK(schedule);
741 /* If it is signal, remove it */
742 if (silc_unlikely(!task)) {
743 schedule_ops.signal_unregister(schedule, schedule->internal, fd);
750 /* Invalidate task by task callback. */
752 SilcBool silc_schedule_task_del_by_callback(SilcSchedule schedule,
753 SilcTaskCallback callback)
756 SilcHashTableList htl;
758 SilcBool ret = FALSE;
760 SILC_LOG_DEBUG(("Unregister task by callback"));
762 SILC_SCHEDULE_LOCK(schedule);
764 /* Delete from fd queue */
765 silc_hash_table_list(schedule->fd_queue, &htl);
766 while (silc_hash_table_get(&htl, NULL, (void *)&task)) {
767 if (task->callback == callback) {
772 silc_hash_table_list_reset(&htl);
774 /* Delete from timeout queue */
775 list = schedule->timeout_queue;
776 silc_list_start(list);
777 while ((task = (SilcTask)silc_list_get(list))) {
778 if (task->callback == callback) {
784 SILC_SCHEDULE_UNLOCK(schedule);
789 /* Invalidate task by context. */
791 SilcBool silc_schedule_task_del_by_context(SilcSchedule schedule,
795 SilcHashTableList htl;
797 SilcBool ret = FALSE;
799 SILC_LOG_DEBUG(("Unregister task by context"));
801 SILC_SCHEDULE_LOCK(schedule);
803 /* Delete from fd queue */
804 silc_hash_table_list(schedule->fd_queue, &htl);
805 while (silc_hash_table_get(&htl, NULL, (void *)&task)) {
806 if (task->context == context) {
811 silc_hash_table_list_reset(&htl);
813 /* Delete from timeout queue */
814 list = schedule->timeout_queue;
815 silc_list_start(list);
816 while ((task = (SilcTask)silc_list_get(list))) {
817 if (task->context == context) {
823 SILC_SCHEDULE_UNLOCK(schedule);
828 /* Invalidate task by all */
830 SilcBool silc_schedule_task_del_by_all(SilcSchedule schedule, int fd,
831 SilcTaskCallback callback,
836 SilcBool ret = FALSE;
838 SILC_LOG_DEBUG(("Unregister task by fd, callback and context"));
840 /* For fd task, callback and context is irrelevant as fd is unique */
842 return silc_schedule_task_del_by_fd(schedule, fd);
844 SILC_SCHEDULE_LOCK(schedule);
846 /* Delete from timeout queue */
847 list = schedule->timeout_queue;
848 silc_list_start(list);
849 while ((task = (SilcTask)silc_list_get(list))) {
850 if (task->callback == callback && task->context == context) {
856 SILC_SCHEDULE_UNLOCK(schedule);
861 /* Sets a file descriptor to be listened by scheduler. One can call this
862 directly if wanted. This can be called multiple times for one file
863 descriptor to set different iomasks. */
865 SilcBool silc_schedule_set_listen_fd(SilcSchedule schedule, SilcUInt32 fd,
866 SilcTaskEvent mask, SilcBool send_events)
870 if (silc_unlikely(!schedule->valid))
873 SILC_SCHEDULE_LOCK(schedule);
875 if (silc_hash_table_find(schedule->fd_queue, SILC_32_TO_PTR(fd),
876 NULL, (void *)&task)) {
877 if (!schedule_ops.schedule_fd(schedule, schedule->internal, task, mask)) {
878 SILC_SCHEDULE_UNLOCK(schedule);
882 if (silc_unlikely(send_events) && mask) {
883 task->revents = mask;
884 silc_schedule_dispatch_fd(schedule);
888 SILC_SCHEDULE_UNLOCK(schedule);
893 /* Returns the file descriptor's current requested event mask. */
895 SilcTaskEvent silc_schedule_get_fd_events(SilcSchedule schedule,
899 SilcTaskEvent event = 0;
901 if (silc_unlikely(!schedule->valid))
904 SILC_SCHEDULE_LOCK(schedule);
905 if (silc_hash_table_find(schedule->fd_queue, SILC_32_TO_PTR(fd),
906 NULL, (void *)&task))
907 event = task->events;
908 SILC_SCHEDULE_UNLOCK(schedule);
913 /* Removes a file descriptor from listen list. */
915 void silc_schedule_unset_listen_fd(SilcSchedule schedule, SilcUInt32 fd)
917 silc_schedule_set_listen_fd(schedule, fd, 0, FALSE);