139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/*
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* Copyright (c) 2008 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <debug.h>
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#include <err.h>
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#include <kernel/event.h>
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#if DEBUGLEVEL > 1
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#define EVENT_CHECK 1
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#endif
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void event_init(event_t *e, bool initial, uint flags)
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{
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#if EVENT_CHECK
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// ASSERT(e->magic != EVENT_MAGIC);
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#endif
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e->magic = EVENT_MAGIC;
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e->signalled = initial;
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e->flags = flags;
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wait_queue_init(&e->wait);
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}
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void event_destroy(event_t *e)
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{
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enter_critical_section();
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#if EVENT_CHECK
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ASSERT(e->magic == EVENT_MAGIC);
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#endif
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e->magic = 0;
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e->signalled = false;
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e->flags = 0;
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wait_queue_destroy(&e->wait, true);
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exit_critical_section();
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}
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status_t event_wait_timeout(event_t *e, time_t timeout)
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{
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status_t ret = NO_ERROR;
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enter_critical_section();
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#if EVENT_CHECK
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ASSERT(e->magic == EVENT_MAGIC);
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#endif
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if (e->signalled) {
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/* signalled, we're going to fall through */
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if (e->flags & EVENT_FLAG_AUTOUNSIGNAL) {
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/* autounsignal flag lets one thread fall through before unsignalling */
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e->signalled = false;
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}
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} else {
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/* unsignalled, block here */
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ret = wait_queue_block(&e->wait, timeout);
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if (ret < 0)
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goto err;
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}
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err:
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exit_critical_section();
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return ret;
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}
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status_t event_wait(event_t *e)
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{
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return event_wait_timeout(e, INFINITE_TIME);
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}
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status_t event_signal(event_t *e, bool reschedule)
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{
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enter_critical_section();
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#if EVENT_CHECK
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ASSERT(e->magic == EVENT_MAGIC);
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#endif
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if (!e->signalled) {
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if (e->flags & EVENT_FLAG_AUTOUNSIGNAL) {
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/* try to release one thread and leave unsignalled if successful */
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if (wait_queue_wake_one(&e->wait, reschedule, NO_ERROR) <= 0) {
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/*
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* if we didn't actually find a thread to wake up, go to
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* signalled state and let the next call to event_wait
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* unsignal the event.
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*/
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e->signalled = true;
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}
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} else {
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/* release all threads and remain signalled */
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e->signalled = true;
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wait_queue_wake_all(&e->wait, reschedule, NO_ERROR);
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}
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}
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exit_critical_section();
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return NO_ERROR;
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}
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status_t event_unsignal(event_t *e)
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{
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enter_critical_section();
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#if EVENT_CHECK
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ASSERT(e->magic == EVENT_MAGIC);
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#endif
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e->signalled = false;
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exit_critical_section();
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return NO_ERROR;
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}
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