NAME¶

sem — POSIX semaphores

SYNOPSIS¶

To compile this driver into the kernel, place the following lines in your kernel configuration file: Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

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 as a kernel option in FreeBSD 3.0. The sem kernel module appeared in FreeBSD 5.0.