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implement POSIX semaphores

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This commit is contained in:
Rich Felker
2011-03-04 00:45:59 -05:00
parent 03dcc3417c
commit 6fc5fdbdc7
10 changed files with 201 additions and 0 deletions
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18
src/thread/sem_timedwait.c Normal file
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#include <semaphore.h>
#include "pthread_impl.h"
int sem_timedwait(sem_t *sem, const struct timespec *at)
{
int val;
for (;;) {
if (a_fetch_add(sem->__val, -1) > 0) return 0;
val = a_fetch_add(sem->__val, 1);
CANCELPT_BEGIN;
if (val <= 0 && __timedwait(sem->__val, val, CLOCK_REALTIME, at, 0) == ETIMEDOUT) {
errno = ETIMEDOUT;
return -1;
}
CANCELPT_END;
}
}