Linux 2.6 - man page for sem_post (linux section 3)
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SEM_POST(3) Linux Programmer's Manual SEM_POST(3)
sem_post - unlock a semaphore
int sem_post(sem_t *sem);
Link with -pthread.
sem_post() increments (unlocks) the semaphore pointed to by sem. If the semaphore's value
consequently becomes greater than zero, then another process or thread blocked in a
sem_wait(3) call will be woken up and proceed to lock the semaphore.
sem_post() returns 0 on success; on error, the value of the semaphore is left unchanged,
-1 is returned, and errno is set to indicate the error.
EINVAL sem is not a valid semaphore.
The maximum allowable value for a semaphore would be exceeded.
sem_post() is async-signal-safe: it may be safely called within a signal handler.
sem_getvalue(3), sem_wait(3), sem_overview(7)
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Linux 2012-05-13 SEM_POST(3)
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