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sem — POSIX semaphores
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):
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.
sem_destroy(3), sem_getvalue(3), sem_init(3), sem_open(3), sem_post(3),
sem_wait(3), config(8), kldload(8), kldunload(8)
The sem facility appeared as a kernel option in FreeBSD 3.0. The sem
kernel module appeared in FreeBSD 5.0.