semaphore.h

NAME

semaphore.h - semaphores (REALTIME)

SYNOPSIS

#include<semaphore.h>

SESCRIPTION

The <semaphore.h> header shall define the sem_t type, used in performing semaphore operstions. The semaphore may be implemented using a file descriptor, in which case applications are able to open up at least a total of {OPEN_MAX} files and semaphores. The symbol SEM_FAILED shall be defined(see sem_open()).

Thefollowing shall be declared as functions and may also be defined as macros. Functions prototypes shall be provided.

    int  sem_close(sem_t *);

    int  sem_destroy(sem_t *);

    int  sem_getvalue(sem_t *restrict, int *restrict);

    int  sem_init(sem_t *, int, unsigned);

    sem_t *sem_open(const char *, int, ...);

    int  sem_post(sem_t *);

    int  sem_timedwait(sem_t *restrict, const struct timespec *restrict);

    int  sem_trywait(sem_t *);

    int  sem_unlink(const char *);

    int  sem_wait(sem_t *);

Inclusion of the <semaphore.h> header many make visible symbols defined in the headers <fcntl.h> and <sys/type.h>

The following sections are informative.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

<fcntl.h>, <sys/types.h>, the System Interfaces colume of IEEE Std 1003.1-2001, sem_destory(), sem_getvalue(), sem_init(), sem_post(), sem_timedwait(), sem_unlink(), sem_wait().