5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1998 - 2008 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.
20 #include "silcruntime.h"
22 #if defined(HAVE_EPOLL_WAIT)
23 #include <sys/epoll.h>
24 #elif defined(HAVE_POLL) && defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
28 const SilcScheduleOps schedule_ops;
30 /* Internal context. */
32 #if defined(HAVE_EPOLL_WAIT)
33 struct epoll_event *fds;
36 #elif defined(HAVE_POLL) && defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
40 #endif /* HAVE_POLL && HAVE_SETRLIMIT && RLIMIT_NOFILE */
45 sigset_t signals_blocked;
50 SilcTaskCallback callback;
53 SilcSchedule schedule;
56 #define SIGNAL_COUNT 32
57 SilcUnixSignal signal_call[SIGNAL_COUNT];
59 #if defined(HAVE_EPOLL_WAIT)
61 /* Linux's fast epoll system (level triggered) */
63 int silc_epoll(SilcSchedule schedule, void *context)
65 SilcUnixScheduler internal = context;
67 struct epoll_event *fds = internal->fds;
68 SilcUInt32 fds_count = internal->fds_count;
69 int ret, i, timeout = -1;
71 /* Allocate larger fd table if needed */
72 i = silc_hash_table_count(schedule->fd_queue);
74 fds = silc_realloc(internal->fds, sizeof(*internal->fds) *
75 (fds_count + (i / 2)));
76 if (silc_likely(fds)) {
78 internal->fds_count = fds_count = fds_count + (i / 2);
82 if (schedule->has_timeout)
83 timeout = ((schedule->timeout.tv_sec * 1000) +
84 (schedule->timeout.tv_usec / 1000));
86 SILC_SCHEDULE_UNLOCK(schedule);
87 ret = epoll_wait(internal->epfd, fds, fds_count, timeout);
88 SILC_SCHEDULE_LOCK(schedule);
92 silc_list_init(schedule->fd_dispatch, struct SilcTaskStruct, next);
94 for (i = 0; i < ret; i++) {
95 task = fds[i].data.ptr;
97 if (!task->header.valid || !task->events) {
98 epoll_ctl(internal->epfd, EPOLL_CTL_DEL, task->fd, &fds[i]);
101 if (fds[i].events & (EPOLLIN | EPOLLPRI | EPOLLHUP | EPOLLERR))
102 task->revents |= SILC_TASK_READ;
103 if (fds[i].events & EPOLLOUT)
104 task->revents |= SILC_TASK_WRITE;
105 silc_list_add(schedule->fd_dispatch, task);
111 #elif defined(HAVE_POLL) && defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
113 /* Calls normal poll() system call. */
115 int silc_poll(SilcSchedule schedule, void *context)
117 SilcUnixScheduler internal = context;
118 SilcHashTableList htl;
120 struct pollfd *fds = internal->fds;
121 SilcUInt32 fds_count = internal->fds_count;
122 int fd, ret, i = 0, timeout = -1;
125 silc_hash_table_list(schedule->fd_queue, &htl);
126 while (silc_hash_table_get(&htl, &fdp, (void *)&task)) {
129 fd = SILC_PTR_TO_32(fdp);
131 /* Allocate larger fd table if needed */
132 if (i >= fds_count) {
133 struct rlimit nofile;
135 fds = silc_realloc(internal->fds, sizeof(*internal->fds) *
136 (fds_count + (fds_count / 2)));
137 if (silc_unlikely(!fds))
140 internal->fds_count = fds_count = fds_count + (fds_count / 2);
141 internal->nofile.rlim_cur = fds_count;
142 if (fds_count > internal->nofile.rlim_max)
143 internal->nofile.rlim_max = fds_count;
144 if (setrlimit(RLIMIT_NOFILE, &nofile) < 0)
150 task->revents = fds[i].revents = 0;
152 if (task->events & SILC_TASK_READ)
153 fds[i].events |= (POLLIN | POLLPRI);
154 if (task->events & SILC_TASK_WRITE)
155 fds[i].events |= POLLOUT;
158 silc_hash_table_list_reset(&htl);
159 silc_list_init(schedule->fd_dispatch, struct SilcTaskStruct, next);
161 if (schedule->has_timeout)
162 timeout = ((schedule->timeout.tv_sec * 1000) +
163 (schedule->timeout.tv_usec / 1000));
166 SILC_SCHEDULE_UNLOCK(schedule);
167 ret = poll(fds, fds_count, timeout);
168 SILC_SCHEDULE_LOCK(schedule);
172 for (i = 0; i < fds_count; i++) {
175 if (!silc_hash_table_find(schedule->fd_queue, SILC_32_TO_PTR(fds[i].fd),
176 NULL, (void *)&task))
178 if (!task->header.valid || !task->events)
182 if (fd & (POLLIN | POLLPRI | POLLERR | POLLHUP | POLLNVAL))
183 task->revents |= SILC_TASK_READ;
185 task->revents |= SILC_TASK_WRITE;
186 silc_list_add(schedule->fd_dispatch, task);
194 /* Calls normal select() system call. */
196 int silc_select(SilcSchedule schedule, void *context)
198 SilcHashTableList htl;
201 int fd, max_fd = 0, ret;
207 silc_hash_table_list(schedule->fd_queue, &htl);
208 while (silc_hash_table_get(&htl, &fdp, (void *)&task)) {
211 fd = SILC_PTR_TO_32(fdp);
214 if (fd >= FD_SETSIZE)
216 #endif /* FD_SETSIZE */
221 if (task->events & SILC_TASK_READ)
223 if (task->events & SILC_TASK_WRITE)
228 silc_hash_table_list_reset(&htl);
229 silc_list_init(schedule->fd_dispatch, struct SilcTaskStruct, next);
231 SILC_SCHEDULE_UNLOCK(schedule);
232 ret = select(max_fd + 1, &in, &out, NULL, (schedule->has_timeout ?
233 &schedule->timeout : NULL));
234 SILC_SCHEDULE_LOCK(schedule);
238 silc_hash_table_list(schedule->fd_queue, &htl);
239 while (silc_hash_table_get(&htl, &fdp, (void *)&task)) {
240 if (!task->header.valid || !task->events)
242 fd = SILC_PTR_TO_32(fdp);
245 if (fd >= FD_SETSIZE)
247 #endif /* FD_SETSIZE */
249 if (FD_ISSET(fd, &in))
250 task->revents |= SILC_TASK_READ;
251 if (FD_ISSET(fd, &out))
252 task->revents |= SILC_TASK_WRITE;
253 silc_list_add(schedule->fd_dispatch, task);
255 silc_hash_table_list_reset(&htl);
260 #endif /* HAVE_POLL && HAVE_SETRLIMIT && RLIMIT_NOFILE */
262 /* Schedule `task' with events `event_mask'. Zero `event_mask' unschedules. */
264 SilcBool silc_schedule_internal_schedule_fd(SilcSchedule schedule,
267 SilcTaskEvent event_mask)
269 #if defined(HAVE_EPOLL_WAIT)
270 SilcUnixScheduler internal = (SilcUnixScheduler)context;
271 struct epoll_event event;
276 SILC_LOG_DEBUG(("Scheduling fd %lu, mask %x", task->fd, event_mask));
278 memset(&event, 0, sizeof(event));
279 if (event_mask & SILC_TASK_READ)
280 event.events |= (EPOLLIN | EPOLLPRI);
281 if (event_mask & SILC_TASK_WRITE)
282 event.events |= EPOLLOUT;
284 /* Zero mask unschedules task */
285 if (silc_unlikely(!event.events)) {
286 if (epoll_ctl(internal->epfd, EPOLL_CTL_DEL, task->fd, &event)) {
287 SILC_LOG_DEBUG(("epoll_ctl (DEL): %s", strerror(errno)));
290 task->scheduled = FALSE;
294 /* Schedule the task */
295 if (silc_unlikely(!task->scheduled)) {
296 event.data.ptr = task;
297 if (epoll_ctl(internal->epfd, EPOLL_CTL_ADD, task->fd, &event)) {
298 SILC_LOG_DEBUG(("epoll_ctl (ADD): %s", strerror(errno)));
301 task->scheduled = TRUE;
305 /* Schedule for specific mask */
306 event.data.ptr = task;
307 if (epoll_ctl(internal->epfd, EPOLL_CTL_MOD, task->fd, &event)) {
308 SILC_LOG_DEBUG(("epoll_ctl (MOD): %s", strerror(errno)));
311 #endif /* HAVE_EPOLL_WAIT */
317 SILC_TASK_CALLBACK(silc_schedule_wakeup_cb)
319 SilcUnixScheduler internal = (SilcUnixScheduler)context;
322 SILC_LOG_DEBUG(("Wokeup"));
324 (void)read(internal->wakeup_pipe[0], &c, 1);
327 SILC_TASK_CALLBACK(silc_schedule_wakeup_init)
329 SilcUnixScheduler internal = schedule->internal;
331 internal->wakeup_task =
332 silc_schedule_task_add(schedule, internal->wakeup_pipe[0],
333 silc_schedule_wakeup_cb, internal,
335 if (!internal->wakeup_task) {
336 SILC_LOG_WARNING(("Could not add a wakeup task, threads won't work"));
337 close(internal->wakeup_pipe[0]);
340 silc_schedule_internal_schedule_fd(schedule, internal,
341 (SilcTaskFd)internal->wakeup_task,
344 #endif /* SILC_THREADS */
346 /* Initializes the platform specific scheduler. This for example initializes
347 the wakeup mechanism of the scheduler. In multi-threaded environment
348 the scheduler needs to be woken up when tasks are added or removed from
349 the task queues. Returns context to the platform specific scheduler. */
351 void *silc_schedule_internal_init(SilcSchedule schedule,
354 SilcUnixScheduler internal;
357 internal = silc_scalloc(schedule->stack, 1, sizeof(*internal));
361 #if defined(HAVE_EPOLL_WAIT)
362 internal->epfd = epoll_create(4);
363 if (internal->epfd < 0) {
364 SILC_LOG_ERROR(("epoll_create() failed: %s", strerror(errno)));
367 internal->fds = silc_calloc(4, sizeof(*internal->fds));
368 if (!internal->fds) {
369 close(internal->epfd);
372 internal->fds_count = 4;
373 #elif defined(HAVE_POLL) && defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
374 getrlimit(RLIMIT_NOFILE, &internal->nofile);
376 if (schedule->max_tasks > 0) {
377 internal->nofile.rlim_cur = schedule->max_tasks;
378 if (schedule->max_tasks > internal->nofile.rlim_max)
379 internal->nofile.rlim_max = schedule->max_tasks;
380 setrlimit(RLIMIT_NOFILE, &internal->nofile);
381 getrlimit(RLIMIT_NOFILE, &internal->nofile);
382 schedule->max_tasks = internal->nofile.rlim_max;
385 internal->fds = silc_calloc(internal->nofile.rlim_cur,
386 sizeof(*internal->fds));
389 internal->fds_count = internal->nofile.rlim_cur;
390 #endif /* HAVE_POLL && HAVE_SETRLIMIT && RLIMIT_NOFILE */
392 sigemptyset(&internal->signals);
395 if (pipe(internal->wakeup_pipe)) {
396 SILC_LOG_ERROR(("pipe() fails: %s", strerror(errno)));
400 silc_schedule_task_add_timeout(schedule, silc_schedule_wakeup_init,
402 #endif /* SILC_THREADS */
404 internal->app_context = app_context;
406 for (i = 0; i < SIGNAL_COUNT; i++) {
407 signal_call[i].sig = 0;
408 signal_call[i].call = FALSE;
409 signal_call[i].schedule = schedule;
412 return (void *)internal;
415 void silc_schedule_internal_signals_block(SilcSchedule schedule,
417 void silc_schedule_internal_signals_unblock(SilcSchedule schedule,
420 /* Uninitializes the platform specific scheduler context. */
422 void silc_schedule_internal_uninit(SilcSchedule schedule, void *context)
424 SilcUnixScheduler internal = (SilcUnixScheduler)context;
430 close(internal->wakeup_pipe[0]);
431 close(internal->wakeup_pipe[1]);
434 #if defined(HAVE_EPOLL_WAIT)
435 close(internal->epfd);
436 silc_free(internal->fds);
437 #elif defined(HAVE_POLL) && defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
438 silc_free(internal->fds);
439 #endif /* HAVE_POLL && HAVE_SETRLIMIT && RLIMIT_NOFILE */
442 /* Wakes up the scheduler */
444 void silc_schedule_internal_wakeup(SilcSchedule schedule, void *context)
447 SilcUnixScheduler internal = (SilcUnixScheduler)context;
449 if (!internal || !internal->wakeup_task)
452 SILC_LOG_DEBUG(("Wakeup"));
454 (void)write(internal->wakeup_pipe[1], "!", 1);
460 static void silc_schedule_internal_sighandler(int signal)
464 SILC_LOG_DEBUG(("Start"));
466 for (i = 0; i < SIGNAL_COUNT; i++) {
467 if (signal_call[i].sig == signal) {
468 signal_call[i].call = TRUE;
469 signal_call[i].schedule->signal_tasks = TRUE;
470 SILC_LOG_DEBUG(("Scheduling signal %d to be called",
471 signal_call[i].sig));
477 void silc_schedule_internal_signal_register(SilcSchedule schedule,
480 SilcTaskCallback callback,
481 void *callback_context)
483 SilcUnixScheduler internal = (SilcUnixScheduler)context;
489 SILC_LOG_DEBUG(("Registering signal %d", sig));
491 silc_schedule_internal_signals_block(schedule, context);
493 for (i = 0; i < SIGNAL_COUNT; i++) {
494 if (!signal_call[i].sig) {
495 signal_call[i].sig = sig;
496 signal_call[i].callback = callback;
497 signal_call[i].context = callback_context;
498 signal_call[i].schedule = schedule;
499 signal_call[i].call = FALSE;
500 signal(sig, silc_schedule_internal_sighandler);
505 silc_schedule_internal_signals_unblock(schedule, context);
506 sigaddset(&internal->signals, sig);
509 void silc_schedule_internal_signal_unregister(SilcSchedule schedule,
513 SilcUnixScheduler internal = (SilcUnixScheduler)context;
519 SILC_LOG_DEBUG(("Unregistering signal %d", sig));
521 silc_schedule_internal_signals_block(schedule, context);
523 for (i = 0; i < SIGNAL_COUNT; i++) {
524 if (signal_call[i].sig == sig) {
525 signal_call[i].sig = 0;
526 signal_call[i].callback = NULL;
527 signal_call[i].context = NULL;
528 signal_call[i].schedule = NULL;
529 signal_call[i].call = FALSE;
530 signal(sig, SIG_DFL);
534 silc_schedule_internal_signals_unblock(schedule, context);
535 sigdelset(&internal->signals, sig);
538 /* Call all signals */
540 void silc_schedule_internal_signals_call(SilcSchedule schedule, void *context)
542 SilcUnixScheduler internal = (SilcUnixScheduler)context;
545 SILC_LOG_DEBUG(("Start"));
550 silc_schedule_internal_signals_block(schedule, context);
552 for (i = 0; i < SIGNAL_COUNT; i++) {
553 if (signal_call[i].call &&
554 signal_call[i].callback) {
555 SILC_LOG_DEBUG(("Calling signal %d callback",
556 signal_call[i].sig));
557 silc_schedule_internal_signals_unblock(schedule, context);
558 signal_call[i].callback(schedule, internal->app_context,
561 signal_call[i].context);
562 signal_call[i].call = FALSE;
563 silc_schedule_internal_signals_block(schedule, context);
567 silc_schedule_internal_signals_unblock(schedule, context);
570 /* Block registered signals in scheduler. */
572 void silc_schedule_internal_signals_block(SilcSchedule schedule, void *context)
574 SilcUnixScheduler internal = (SilcUnixScheduler)context;
579 sigprocmask(SIG_BLOCK, &internal->signals, &internal->signals_blocked);
582 /* Unblock registered signals in schedule. */
584 void silc_schedule_internal_signals_unblock(SilcSchedule schedule,
587 SilcUnixScheduler internal = (SilcUnixScheduler)context;
592 sigprocmask(SIG_SETMASK, &internal->signals_blocked, NULL);
595 const SilcScheduleOps schedule_ops =
597 silc_schedule_internal_init,
598 silc_schedule_internal_uninit,
599 #if defined(HAVE_EPOLL_WAIT)
601 #elif defined(HAVE_POLL) && defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
605 #endif /* HAVE_POLL && HAVE_SETRLIMIT && RLIMIT_NOFILE */
606 silc_schedule_internal_schedule_fd,
607 silc_schedule_internal_wakeup,
608 silc_schedule_internal_signal_register,
609 silc_schedule_internal_signal_unregister,
610 silc_schedule_internal_signals_call,
611 silc_schedule_internal_signals_block,
612 silc_schedule_internal_signals_unblock,