semaphore.h File Reference

Semaphores. More...

Detailed Description

Semaphores.

See also

The Open Group Base Specifications Issue 7, <semaphore.h>

Author

Christian Mehlis mehli.nosp@m.s@in.nosp@m.f.fu-.nosp@m.berl.nosp@m.in.de

Martine Lenders mlend.nosp@m.ers@.nosp@m.inf.f.nosp@m.u-be.nosp@m.rlin..nosp@m.de

René Kijewski kijew.nosp@m.ski@.nosp@m.inf.f.nosp@m.u-be.nosp@m.rlin..nosp@m.de

Víctor Ariño victo.nosp@m.r.ar.nosp@m.ino@z.nosp@m.ii.a.nosp@m.ero

Definition in file semaphore.h.

#include <errno.h>
#include <time.h>
#include "sema.h"

Include dependency graph for semaphore.h:

Go to the source code of this file.

Macros
#define	SEM_FAILED   ((sem_t *) 0)
	Value returned if ‘sem_open’ failed.

Typedefs
typedef sema_t	sem_t
	POSIX-specific semaphore type.

Functions
static int	sem_init (sem_t *sem, int pshared, unsigned value)
	Initialize an unnamed semaphore.
static int	sem_destroy (sem_t *sem)
	destroy an unnamed semaphore
static int	sem_post (sem_t *sem)
	Unlock a semaphore.
static int	sem_wait (sem_t *sem)
	Lock a semaphore.
static sem_t *	sem_open (const char *name, int oflag,...)
	Open a named semaphore name with open flags oflag.
static int	sem_close (sem_t *sem)
	Close descriptor for named semaphore sem.
static int	sem_unlink (const char *name)
	Remove named semaphore name.
int	sem_timedwait (sem_t *sem, const struct timespec *abstime)
	Similar to ‘sem_wait’ but wait only until abstime.
static int	sem_trywait (sem_t *sem)
	Test whether sem is posted.
static int	sem_getvalue (sem_t *sem, int *sval)
	Get current value of sem and store it in sval.