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SEM(4)			     Kernel Interfaces Manual			  SEM(4)

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.conf(5):

	   sem_load="YES"

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

	   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 in FreeBSD 5.0.

FreeBSD ports 15.1		February 7, 2014			  SEM(4)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=sem&sektion=4&manpath=FreeBSD+15.1-RELEASE+and+Ports>

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