sem (4)

Leading comments

Copyright (c) 2002 Tim J. Robbins
All rights reserved.

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modification, are permitted provided that the following conditions
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(The comments found at the beginning of the groff file "man4/sem.4freebsd".)

NAME

sem - POSIX semaphores

SYNOPSIS

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

options P1003_1B_SEMAPHORES

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf5:

sem_load="YES"

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

kldload sem

DESCRIPTION

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

SEE ALSO

sem_destroy3, sem_getvalue3, sem_init3, sem_open3, sem_post3, sem_wait3, config(8), kldload(8), kldunload(8)

HISTORY

The facility appeared in Fx 5.0 .