Semaphores.
[Operating System Dependent Functionality.]

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Detailed Description

This module provides abstraction for semaphores, where available.

Functions
pj_status_t	pj_sem_create (pj_pool_t *pool, const char *name, unsigned initial, unsigned max, pj_sem_t **sem)
pj_status_t	pj_sem_wait (pj_sem_t *sem)
pj_status_t	pj_sem_trywait (pj_sem_t *sem)
pj_status_t	pj_sem_post (pj_sem_t *sem)
pj_status_t	pj_sem_destroy (pj_sem_t *sem)

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Function Documentation

pj_status_t pj_sem_create	(	pj_pool_t *	pool,
		const char *	name,
		unsigned	initial,
		unsigned	max,
		pj_sem_t **	sem
	)

Create semaphore.

Parameters:

	pool	The pool.
	name	Name to be assigned to the semaphore (for logging purpose)
	initial	The initial count of the semaphore.
	max	The maximum count of the semaphore.
	sem	Pointer to hold the semaphore created.

Returns:

PJ_SUCCESS on success, or the error code.

pj_status_t pj_sem_destroy

(

pj_sem_t *

sem

)

Destroy semaphore.

Parameters:

sem

The semaphore.

Returns:

PJ_SUCCESS on success, or the error code.

pj_status_t pj_sem_post

(

pj_sem_t *

sem

)

Release semaphore.

Parameters:

sem

The semaphore.

Returns:

PJ_SUCCESS on success, or the error code.

pj_status_t pj_sem_trywait

(

pj_sem_t *

sem

)

Try wait for semaphore.

Parameters:

sem

The semaphore.

Returns:

PJ_SUCCESS on success, or the error code.

pj_status_t pj_sem_wait

(

pj_sem_t *

sem

)

Wait for semaphore.

Parameters:

sem

The semaphore.

Returns:

PJ_SUCCESS on success, or the error code.