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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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11
src/thread/sem_trywait.c Normal file
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#include <semaphore.h>
#include "pthread_impl.h"
int sem_trywait(sem_t *sem)
{
int val = a_fetch_add(sem->__val, -1);
if (val > 0) return 0;
a_inc(sem->__val);
errno = EAGAIN;
return -1;
}