sema_post(3scl)sema_post(3scl)NAMEsema_post - Increments (posts, unlocks, signals) a semaphore.
LIBRARY
SCL Threads Library (libthread.so)
SYNOPSIS
#include <synch.h>
int sema_post(
sema_t *semp );
PARAMETERS
Pointer to the semaphore to be incremented.
DESCRIPTION
This routine atomically increments the specified semaphore. If any
threads were blocked on the semaphore, one is unblocked.
SCL IMPLEMENTATION NOTESsema_post(3scl) is implemented by calling sem_post(3).
Tests on Solaris indicate that sema_post() does not validate the sema‐
phore parameter. This implementation typically returns EFAULT if the
semaphore is invalid, and writes an error-mapping message to the SCL
errorlog.
RETURN VALUES
If an error condition occurs, this routine returns an integer value
indicating the type of error.
Additional error return information may be written to the SCL error
log. Refer to scl_error_log(4scl) for details.
Possible return values are as follows: Successful completion.
sem_post(3) returned EINVAL, typically indicating that semp does not
point to a valid semaphore. An error-mapping message is written to the
SCL errorlog. Or:
An internal implementation error occurred. Refer to the SCL errorlog
for additional information.
Note: EFAULT is not returned if semp is an illegal address. An illegal
address generates a SIGSEGV signal, which by default will abort the
process and generate a core dump.
ERRORS
None.
RELATED INFORMATION
Functions: scl_intro(3scl), scl_thread_intro(3scl), sem_post(3),
sema_destroy(3scl), sema_init(3scl), sema_trywait(3scl)sema_wait(3scl)
Files: scl_error_log(4scl)
Manuals: Solaris Compatibility Libraries User's Guide
sema_post(3scl)
