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NAME

     sem — POSIX semaphores

SYNOPSIS

     To compile this driver into the kernel, place the following lines 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.conf(5):

           sem_load="YES"

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