0,0 → 1,57 |
/* |
* Copyright (C) 2001-2004 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
#include <synch/synch.h> |
#include <synch/semaphore.h> |
#include <synch/waitq.h> |
#include <synch/spinlock.h> |
|
void semaphore_initialize(semaphore_t *s, int val) |
{ |
pri_t pri; |
|
waitq_initialize(&s->wq); |
|
pri = cpu_priority_high(); |
|
spinlock_lock(&s->wq.lock); |
s->wq.missed_wakeups = val; |
spinlock_unlock(&s->wq.lock); |
|
cpu_priority_restore(pri); |
} |
|
int _semaphore_down_timeout(semaphore_t *s, __u32 usec, int trydown) |
{ |
return waitq_sleep_timeout(&s->wq, usec, trydown); |
} |
|
void semaphore_up(semaphore_t *s) |
{ |
waitq_wakeup(&s->wq, WAKEUP_FIRST); |
} |