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.
RETURN VALUE
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.
ERRORS
EINVAL
sem
is not a valid semaphore.
CONFORMING TO
POSIX.1-2001.
NOTES
sem_post()
is async-signal-safe:
it may be safely called within a signal handler.
This page is part of release 3.14 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.