Author: Pekka Riikonen <priikone@silcnet.org>
- Copyright (C) 1998 - 2001 Pekka Riikonen
+ Copyright (C) 1998 - 2007 Pekka Riikonen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
+ the Free Software Foundation; version 2 of the License.
+
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
*/
/* $Id$ */
-#include "silcincludes.h"
+#include "silc.h"
+
+#if defined(HAVE_EPOLL_WAIT)
+#include <sys/epoll.h>
+#elif defined(HAVE_POLL) && defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
+#include <poll.h>
+#endif
+
+const SilcScheduleOps schedule_ops;
+
+/* Internal context. */
+typedef struct {
+#if defined(HAVE_EPOLL_WAIT)
+ struct epoll_event *fds;
+ SilcUInt32 fds_count;
+ int epfd;
+#elif defined(HAVE_POLL) && defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
+ struct rlimit nofile;
+ struct pollfd *fds;
+ SilcUInt32 fds_count;
+#endif /* HAVE_POLL && HAVE_SETRLIMIT && RLIMIT_NOFILE */
+ void *app_context;
+ int wakeup_pipe[2];
+ SilcTask wakeup_task;
+ sigset_t signals;
+ sigset_t signals_blocked;
+} *SilcUnixScheduler;
+
+typedef struct {
+ SilcUInt32 sig;
+ SilcTaskCallback callback;
+ void *context;
+ SilcBool call;
+ SilcSchedule schedule;
+} SilcUnixSignal;
+
+#define SIGNAL_COUNT 32
+SilcUnixSignal signal_call[SIGNAL_COUNT];
+
+#if defined(HAVE_EPOLL_WAIT)
+
+/* Linux's fast epoll system (level triggered) */
+
+int silc_epoll(SilcSchedule schedule, void *context)
+{
+ SilcUnixScheduler internal = context;
+ SilcTaskFd task;
+ struct epoll_event *fds = internal->fds;
+ SilcUInt32 fds_count = internal->fds_count;
+ int ret, i, timeout = -1;
+
+ /* Allocate larger fd table if needed */
+ i = silc_hash_table_count(schedule->fd_queue);
+ if (i > fds_count) {
+ fds = silc_realloc(internal->fds, sizeof(*internal->fds) *
+ (fds_count + (i / 2)));
+ if (silc_likely(fds)) {
+ internal->fds = fds;
+ internal->fds_count = fds_count = fds_count + (i / 2);
+ }
+ }
+
+ if (schedule->has_timeout)
+ timeout = ((schedule->timeout.tv_sec * 1000) +
+ (schedule->timeout.tv_usec / 1000));
+
+ SILC_SCHEDULE_UNLOCK(schedule);
+ ret = epoll_wait(internal->epfd, fds, fds_count, timeout);
+ SILC_SCHEDULE_LOCK(schedule);
+ if (ret <= 0)
+ return ret;
+
+ silc_list_init(schedule->fd_dispatch, struct SilcTaskStruct, next);
+
+ for (i = 0; i < ret; i++) {
+ task = fds[i].data.ptr;
+ task->revents = 0;
+ if (!task->header.valid || !task->events) {
+ epoll_ctl(internal->epfd, EPOLL_CTL_DEL, task->fd, &fds[i]);
+ continue;
+ }
+ if (fds[i].events & (EPOLLIN | EPOLLPRI | EPOLLHUP | EPOLLERR))
+ task->revents |= SILC_TASK_READ;
+ if (fds[i].events & EPOLLOUT)
+ task->revents |= SILC_TASK_WRITE;
+ silc_list_add(schedule->fd_dispatch, task);
+ }
+
+ return ret;
+}
+
+#elif defined(HAVE_POLL) && defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
+
+/* Calls normal poll() system call. */
+
+int silc_poll(SilcSchedule schedule, void *context)
+{
+ SilcUnixScheduler internal = context;
+ SilcHashTableList htl;
+ SilcTaskFd task;
+ struct pollfd *fds = internal->fds;
+ SilcUInt32 fds_count = internal->fds_count;
+ int fd, ret, i = 0, timeout = -1;
+ void *fdp;
+
+ silc_hash_table_list(schedule->fd_queue, &htl);
+ while (silc_hash_table_get(&htl, &fdp, (void *)&task)) {
+ if (!task->events)
+ continue;
+ fd = SILC_PTR_TO_32(fdp);
+
+ /* Allocate larger fd table if needed */
+ if (i >= fds_count) {
+ struct rlimit nofile;
+
+ fds = silc_realloc(internal->fds, sizeof(*internal->fds) *
+ (fds_count + (fds_count / 2)));
+ if (silc_unlikely(!fds))
+ break;
+ internal->fds = fds;
+ internal->fds_count = fds_count = fds_count + (fds_count / 2);
+ internal->nofile.rlim_cur = fds_count;
+ if (fds_count > internal->nofile.rlim_max)
+ internal->nofile.rlim_max = fds_count;
+ if (setrlimit(RLIMIT_NOFILE, &nofile) < 0)
+ break;
+ }
+
+ fds[i].fd = fd;
+ fds[i].events = 0;
+ task->revents = fds[i].revents = 0;
+
+ if (task->events & SILC_TASK_READ)
+ fds[i].events |= (POLLIN | POLLPRI);
+ if (task->events & SILC_TASK_WRITE)
+ fds[i].events |= POLLOUT;
+ i++;
+ }
+ silc_hash_table_list_reset(&htl);
+ silc_list_init(schedule->fd_dispatch, struct SilcTaskStruct, next);
+
+ if (schedule->has_timeout)
+ timeout = ((schedule->timeout.tv_sec * 1000) +
+ (schedule->timeout.tv_usec / 1000));
+
+ fds_count = i;
+ SILC_SCHEDULE_UNLOCK(schedule);
+ ret = poll(fds, fds_count, timeout);
+ SILC_SCHEDULE_LOCK(schedule);
+ if (ret <= 0)
+ return ret;
+
+ for (i = 0; i < fds_count; i++) {
+ if (!fds[i].revents)
+ continue;
+ if (!silc_hash_table_find(schedule->fd_queue, SILC_32_TO_PTR(fds[i].fd),
+ NULL, (void *)&task))
+ continue;
+ if (!task->header.valid || !task->events)
+ continue;
+
+ fd = fds[i].revents;
+ if (fd & (POLLIN | POLLPRI | POLLERR | POLLHUP | POLLNVAL))
+ task->revents |= SILC_TASK_READ;
+ if (fd & POLLOUT)
+ task->revents |= SILC_TASK_WRITE;
+ silc_list_add(schedule->fd_dispatch, task);
+ }
+
+ return ret;
+}
+
+#else
/* Calls normal select() system call. */
-int silc_select(int n, fd_set *readfds, fd_set *writefds,
- fd_set *exceptfds, struct timeval *timeout)
+int silc_select(SilcSchedule schedule, void *context)
{
- return select(n, readfds, writefds, exceptfds, timeout);
+ SilcHashTableList htl;
+ SilcTaskFd task;
+ fd_set in, out;
+ int fd, max_fd = 0, ret;
+ void *fdp;
+
+ FD_ZERO(&in);
+ FD_ZERO(&out);
+
+ silc_hash_table_list(schedule->fd_queue, &htl);
+ while (silc_hash_table_get(&htl, &fdp, (void *)&task)) {
+ if (!task->events)
+ continue;
+ fd = SILC_PTR_TO_32(fdp);
+
+#ifdef FD_SETSIZE
+ if (fd >= FD_SETSIZE)
+ break;
+#endif /* FD_SETSIZE */
+
+ if (fd > max_fd)
+ max_fd = fd;
+
+ if (task->events & SILC_TASK_READ)
+ FD_SET(fd, &in);
+ if (task->events & SILC_TASK_WRITE)
+ FD_SET(fd, &out);
+
+ task->revents = 0;
+ }
+ silc_hash_table_list_reset(&htl);
+ silc_list_init(schedule->fd_dispatch, struct SilcTaskStruct, next);
+
+ SILC_SCHEDULE_UNLOCK(schedule);
+ ret = select(max_fd + 1, &in, &out, NULL, (schedule->has_timeout ?
+ &schedule->timeout : NULL));
+ SILC_SCHEDULE_LOCK(schedule);
+ if (ret <= 0)
+ return ret;
+
+ silc_hash_table_list(schedule->fd_queue, &htl);
+ while (silc_hash_table_get(&htl, &fdp, (void *)&task)) {
+ if (!task->header.valid || !task->events)
+ continue;
+ fd = SILC_PTR_TO_32(fdp);
+
+#ifdef FD_SETSIZE
+ if (fd >= FD_SETSIZE)
+ break;
+#endif /* FD_SETSIZE */
+
+ if (FD_ISSET(fd, &in))
+ task->revents |= SILC_TASK_READ;
+ if (FD_ISSET(fd, &out))
+ task->revents |= SILC_TASK_WRITE;
+ silc_list_add(schedule->fd_dispatch, task);
+ }
+ silc_hash_table_list_reset(&htl);
+
+ return ret;
}
-#ifdef SILC_THREADS
+#endif /* HAVE_POLL && HAVE_SETRLIMIT && RLIMIT_NOFILE */
-/* Internal wakeup context. */
-typedef struct {
- int wakeup_pipe[2];
- SilcTask wakeup_task;
-} *SilcUnixWakeup;
+/* Schedule `task' with events `event_mask'. Zero `event_mask' unschedules. */
+
+SilcBool silc_schedule_internal_schedule_fd(SilcSchedule schedule,
+ void *context,
+ SilcTaskFd task,
+ SilcTaskEvent event_mask)
+{
+#if defined(HAVE_EPOLL_WAIT)
+ SilcUnixScheduler internal = (SilcUnixScheduler)context;
+ struct epoll_event event;
+
+ if (!internal)
+ return TRUE;
+
+ SILC_LOG_DEBUG(("Scheduling fd %lu, mask %x", task->fd, event_mask));
+
+ memset(&event, 0, sizeof(event));
+ if (event_mask & SILC_TASK_READ)
+ event.events |= (EPOLLIN | EPOLLPRI);
+ if (event_mask & SILC_TASK_WRITE)
+ event.events |= EPOLLOUT;
+
+ /* Zero mask unschedules task */
+ if (silc_unlikely(!event.events)) {
+ if (epoll_ctl(internal->epfd, EPOLL_CTL_DEL, task->fd, &event)) {
+ SILC_LOG_DEBUG(("epoll_ctl (DEL): %s", strerror(errno)));
+ return FALSE;
+ }
+ return TRUE;
+ }
+
+ /* Schedule the task */
+ if (silc_unlikely(!task->scheduled)) {
+ event.data.ptr = task;
+ if (epoll_ctl(internal->epfd, EPOLL_CTL_ADD, task->fd, &event)) {
+ SILC_LOG_DEBUG(("epoll_ctl (ADD): %s", strerror(errno)));
+ return FALSE;
+ }
+ task->scheduled = TRUE;
+ return TRUE;
+ }
+
+ /* Schedule for specific mask */
+ event.data.ptr = task;
+ if (epoll_ctl(internal->epfd, EPOLL_CTL_MOD, task->fd, &event)) {
+ SILC_LOG_DEBUG(("epoll_ctl (MOD): %s", strerror(errno)));
+ return FALSE;
+ }
+#endif /* HAVE_EPOLL_WAIT */
+ return TRUE;
+}
+
+#ifdef SILC_THREADS
SILC_TASK_CALLBACK(silc_schedule_wakeup_cb)
{
- SilcUnixWakeup wakeup = (SilcUnixWakeup)context;
+ SilcUnixScheduler internal = (SilcUnixScheduler)context;
unsigned char c;
- read(wakeup->wakeup_pipe[0], &c, 1);
+ SILC_LOG_DEBUG(("Wokeup"));
+
+ (void)read(internal->wakeup_pipe[0], &c, 1);
}
+SILC_TASK_CALLBACK(silc_schedule_wakeup_init)
+{
+ SilcUnixScheduler internal = schedule->internal;
+
+ internal->wakeup_task =
+ silc_schedule_task_add(schedule, internal->wakeup_pipe[0],
+ silc_schedule_wakeup_cb, internal,
+ 0, 0, SILC_TASK_FD);
+ if (!internal->wakeup_task) {
+ SILC_LOG_WARNING(("Could not add a wakeup task, threads won't work"));
+ close(internal->wakeup_pipe[0]);
+ return;
+ }
+ silc_schedule_internal_schedule_fd(schedule, internal,
+ (SilcTaskFd)internal->wakeup_task,
+ SILC_TASK_READ);
+}
#endif /* SILC_THREADS */
-/* Initializes the wakeup of the scheduler. In multi-threaded environment
- the scheduler needs to be wakenup when tasks are added or removed from
- the task queues. This will initialize the wakeup for the scheduler.
- Any tasks that needs to be registered must be registered to the `queue'.
- It is quaranteed that the scheduler will automatically free any
- registered tasks in this queue. This is system specific routine. */
+/* Initializes the platform specific scheduler. This for example initializes
+ the wakeup mechanism of the scheduler. In multi-threaded environment
+ the scheduler needs to be woken up when tasks are added or removed from
+ the task queues. Returns context to the platform specific scheduler. */
-void *silc_schedule_wakeup_init(void *queue)
+void *silc_schedule_internal_init(SilcSchedule schedule,
+ void *app_context)
{
-#ifdef SILC_THREADS
- SilcUnixWakeup wakeup;
+ SilcUnixScheduler internal;
+ int i;
- wakeup = silc_calloc(1, sizeof(*wakeup));
+ internal = silc_scalloc(schedule->stack, 1, sizeof(*internal));
+ if (!internal)
+ return NULL;
- if (pipe(wakeup->wakeup_pipe)) {
- silc_free(wakeup);
+#if defined(HAVE_EPOLL_WAIT)
+ internal->epfd = epoll_create(4);
+ if (internal->epfd < 0) {
+ SILC_LOG_ERROR(("epoll_create() failed: %s", strerror(errno)));
+ return NULL;
+ }
+ internal->fds = silc_calloc(4, sizeof(*internal->fds));
+ if (!internal->fds) {
+ close(internal->epfd);
return NULL;
}
+ internal->fds_count = 4;
+#elif defined(HAVE_POLL) && defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
+ getrlimit(RLIMIT_NOFILE, &internal->nofile);
+
+ if (schedule->max_tasks > 0) {
+ internal->nofile.rlim_cur = schedule->max_tasks;
+ if (schedule->max_tasks > internal->nofile.rlim_max)
+ internal->nofile.rlim_max = schedule->max_tasks;
+ setrlimit(RLIMIT_NOFILE, &internal->nofile);
+ getrlimit(RLIMIT_NOFILE, &internal->nofile);
+ schedule->max_tasks = internal->nofile.rlim_max;
+ }
+
+ internal->fds = silc_calloc(internal->nofile.rlim_cur,
+ sizeof(*internal->fds));
+ if (!internal->fds)
+ return NULL;
+ internal->fds_count = internal->nofile.rlim_cur;
+#endif /* HAVE_POLL && HAVE_SETRLIMIT && RLIMIT_NOFILE */
- wakeup->wakeup_task = silc_task_register(queue, wakeup->wakeup_pipe[0],
- silc_schedule_wakeup_cb, wakeup,
- 0, 0, SILC_TASK_FD,
- SILC_TASK_PRI_NORMAL);
- if (!wakeup->wakeup_task) {
- close(wakeup->wakeup_pipe[0]);
- close(wakeup->wakeup_pipe[1]);
- silc_free(wakeup);
+ sigemptyset(&internal->signals);
+
+#ifdef SILC_THREADS
+ if (pipe(internal->wakeup_pipe)) {
+ SILC_LOG_ERROR(("pipe() fails: %s", strerror(errno)));
return NULL;
}
- return (void *)wakeup;
-#endif
- return NULL;
+ silc_schedule_task_add_timeout(schedule, silc_schedule_wakeup_init,
+ internal, 0, 0);
+#endif /* SILC_THREADS */
+
+ internal->app_context = app_context;
+
+ for (i = 0; i < SIGNAL_COUNT; i++) {
+ signal_call[i].sig = 0;
+ signal_call[i].call = FALSE;
+ signal_call[i].schedule = schedule;
+ }
+
+ return (void *)internal;
}
-/* Uninitializes the system specific wakeup. */
+void silc_schedule_internal_signals_block(SilcSchedule schedule,
+ void *context);
+void silc_schedule_internal_signals_unblock(SilcSchedule schedule,
+ void *context);
-void silc_schedule_wakeup_uninit(void *context)
+/* Uninitializes the platform specific scheduler context. */
+
+void silc_schedule_internal_uninit(SilcSchedule schedule, void *context)
{
-#ifdef SILC_THREADS
- SilcUnixWakeup wakeup = (SilcUnixWakeup)context;
+ SilcUnixScheduler internal = (SilcUnixScheduler)context;
- if (!wakeup)
+ if (!internal)
return;
- close(wakeup->wakeup_pipe[0]);
- close(wakeup->wakeup_pipe[1]);
- silc_free(wakeup);
+#ifdef SILC_THREADS
+ close(internal->wakeup_pipe[0]);
+ close(internal->wakeup_pipe[1]);
#endif
+
+#if defined(HAVE_EPOLL_WAIT)
+ close(internal->epfd);
+ silc_free(internal->fds);
+#elif defined(HAVE_POLL) && defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
+ silc_free(internal->fds);
+#endif /* HAVE_POLL && HAVE_SETRLIMIT && RLIMIT_NOFILE */
}
/* Wakes up the scheduler */
-void silc_schedule_wakeup_internal(void *context)
+void silc_schedule_internal_wakeup(SilcSchedule schedule, void *context)
{
#ifdef SILC_THREADS
- SilcUnixWakeup wakeup = (SilcUnixWakeup)context;
+ SilcUnixScheduler internal = (SilcUnixScheduler)context;
- if (!wakeup)
+ if (!internal || !internal->wakeup_task)
return;
- write(wakeup->wakeup_pipe[1], "!", 1);
+ SILC_LOG_DEBUG(("Wakeup"));
+
+ (void)write(internal->wakeup_pipe[1], "!", 1);
#endif
}
+
+/* Signal handler */
+
+static void silc_schedule_internal_sighandler(int signal)
+{
+ int i;
+
+ SILC_LOG_DEBUG(("Start"));
+
+ for (i = 0; i < SIGNAL_COUNT; i++) {
+ if (signal_call[i].sig == signal) {
+ signal_call[i].call = TRUE;
+ signal_call[i].schedule->signal_tasks = TRUE;
+ SILC_LOG_DEBUG(("Scheduling signal %d to be called",
+ signal_call[i].sig));
+ break;
+ }
+ }
+}
+
+void silc_schedule_internal_signal_register(SilcSchedule schedule,
+ void *context,
+ SilcUInt32 sig,
+ SilcTaskCallback callback,
+ void *callback_context)
+{
+ SilcUnixScheduler internal = (SilcUnixScheduler)context;
+ int i;
+
+ if (!internal)
+ return;
+
+ SILC_LOG_DEBUG(("Registering signal %d", sig));
+
+ silc_schedule_internal_signals_block(schedule, context);
+
+ for (i = 0; i < SIGNAL_COUNT; i++) {
+ if (!signal_call[i].sig) {
+ signal_call[i].sig = sig;
+ signal_call[i].callback = callback;
+ signal_call[i].context = callback_context;
+ signal_call[i].schedule = schedule;
+ signal_call[i].call = FALSE;
+ signal(sig, silc_schedule_internal_sighandler);
+ break;
+ }
+ }
+
+ silc_schedule_internal_signals_unblock(schedule, context);
+ sigaddset(&internal->signals, sig);
+}
+
+void silc_schedule_internal_signal_unregister(SilcSchedule schedule,
+ void *context,
+ SilcUInt32 sig)
+{
+ SilcUnixScheduler internal = (SilcUnixScheduler)context;
+ int i;
+
+ if (!internal)
+ return;
+
+ SILC_LOG_DEBUG(("Unregistering signal %d", sig));
+
+ silc_schedule_internal_signals_block(schedule, context);
+
+ for (i = 0; i < SIGNAL_COUNT; i++) {
+ if (signal_call[i].sig == sig) {
+ signal_call[i].sig = 0;
+ signal_call[i].callback = NULL;
+ signal_call[i].context = NULL;
+ signal_call[i].schedule = NULL;
+ signal_call[i].call = FALSE;
+ signal(sig, SIG_DFL);
+ }
+ }
+
+ silc_schedule_internal_signals_unblock(schedule, context);
+ sigdelset(&internal->signals, sig);
+}
+
+/* Call all signals */
+
+void silc_schedule_internal_signals_call(SilcSchedule schedule, void *context)
+{
+ SilcUnixScheduler internal = (SilcUnixScheduler)context;
+ int i;
+
+ SILC_LOG_DEBUG(("Start"));
+
+ if (!internal)
+ return;
+
+ silc_schedule_internal_signals_block(schedule, context);
+
+ for (i = 0; i < SIGNAL_COUNT; i++) {
+ if (signal_call[i].call &&
+ signal_call[i].callback) {
+ SILC_LOG_DEBUG(("Calling signal %d callback",
+ signal_call[i].sig));
+ silc_schedule_internal_signals_unblock(schedule, context);
+ signal_call[i].callback(schedule, internal->app_context,
+ SILC_TASK_INTERRUPT,
+ signal_call[i].sig,
+ signal_call[i].context);
+ signal_call[i].call = FALSE;
+ silc_schedule_internal_signals_block(schedule, context);
+ }
+ }
+
+ silc_schedule_internal_signals_unblock(schedule, context);
+}
+
+/* Block registered signals in scheduler. */
+
+void silc_schedule_internal_signals_block(SilcSchedule schedule, void *context)
+{
+ SilcUnixScheduler internal = (SilcUnixScheduler)context;
+
+ if (!internal)
+ return;
+
+ sigprocmask(SIG_BLOCK, &internal->signals, &internal->signals_blocked);
+}
+
+/* Unblock registered signals in schedule. */
+
+void silc_schedule_internal_signals_unblock(SilcSchedule schedule,
+ void *context)
+{
+ SilcUnixScheduler internal = (SilcUnixScheduler)context;
+
+ if (!internal)
+ return;
+
+ sigprocmask(SIG_SETMASK, &internal->signals_blocked, NULL);
+}
+
+const SilcScheduleOps schedule_ops =
+{
+ silc_schedule_internal_init,
+ silc_schedule_internal_uninit,
+#if defined(HAVE_EPOLL_WAIT)
+ silc_epoll,
+#elif defined(HAVE_POLL) && defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
+ silc_poll,
+#else
+ silc_select,
+#endif /* HAVE_POLL && HAVE_SETRLIMIT && RLIMIT_NOFILE */
+ silc_schedule_internal_schedule_fd,
+ silc_schedule_internal_wakeup,
+ silc_schedule_internal_signal_register,
+ silc_schedule_internal_signal_unregister,
+ silc_schedule_internal_signals_call,
+ silc_schedule_internal_signals_block,
+ silc_schedule_internal_signals_unblock,
+};
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