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Man Pages


Manual Reference Pages  -  SEM (4)

NAME

sem - POSIX semaphores

CONTENTS

Synopsis
Description
See Also
History

SYNOPSIS

To compile this driver into the kernel, place the following line in your kernel configuration file:


.Cd options P1003_1B_SEMAPHORES

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

sem_load="YES"

To load the driver as a module at run-time, run the following command as root:

kldload sem

DESCRIPTION

The sem facility provides system calls used by the standard C library (libc) to implement POSIX semaphores. This facility offers support for such functions as sem_init and sem_wait. It is available both as a kernel option for static inclusion and as a dynamic kernel module.

SEE ALSO

sem_destroy(3), sem_getvalue(3), sem_init(3), sem_open(3), sem_post(3), sem_wait(3), config(8), kldload(8), kldunload(8)

HISTORY

The sem facility appeared in
.Fx 5.0 .
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