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Man Pages


Manual Reference Pages  -  SEM_INIT (3)

NAME

sem_init - initialize an unnamed semaphore

CONTENTS

Library
Synopsis
Description
Return Values
Errors
See Also
Standards

LIBRARY


.Lb libc

SYNOPSIS


.In semaphore.h int sem_init sem_t *sem int pshared unsigned int value

DESCRIPTION

The sem_init function initializes the unnamed semaphore pointed to by sem to have the value value.

A non-zero value for pshared specifies a shared semaphore that can be used by multiple processes, the semaphore should be located in shared memory region (see mmap(2), shm_open(2), and shmget(2)), any process having read and write access to address sem can perform semaphore operations on sem.

Following a successful call to sem_init, sem can be used as an argument in subsequent calls to sem_wait(3), sem_trywait(3), sem_post(3), and sem_destroy(3). The sem argument is no longer valid after a successful call to sem_destroy(3).

RETURN VALUES


.Rv -std sem_init

ERRORS

The sem_init function will fail if:
[EINVAL]
  The value argument exceeds SEM_VALUE_MAX.
[ENOSPC]
  Memory allocation error.

SEE ALSO

sem_destroy(3), sem_getvalue(3), sem_post(3), sem_trywait(3), sem_wait(3), sem(4)

STANDARDS

The sem_init function conforms to -p1003.1-96.
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