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NAME

     sem - POSIX semaphores

SYNOPSIS

     To link into the kernel:

           options P1003_1B_SEMAPHORES

     To load as a kernel loadable module:

           kldload sem

DESCRIPTION

     The sem facility provides system calls used by the standard C library
     (libc) to implement POSIX semaphores.  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.