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.TH SEMAPHORE.H 3HEAD "Feb 5, 2008"
.SH NAME
semaphore.h, semaphore \- semaphores
.SH SYNOPSIS
.LP
.nf
#include <\fBsemaphore.h\fR>
.fi

.SH DESCRIPTION
.sp
.LP
The <\fBsemaphore.h\fR> header defines the \fBsem_t\fR type, used in performing
semaphore operations. The semaphore can be implemented using a file descriptor,
in which case applications are able to open up at least a total of
{\fBOPEN_MAX\fR} files and semaphores. The symbol \fBSEM_FAILED\fR is defined
(see \fBsem_open\fR(3C)).
.sp
.LP
Inclusion of the <\fBsemaphore.h\fR> header can make visible symbols defined in
the headers <\fBfcntl.h\fR> and <\fBsys/types.h\fR>. See \fBfcntl.h\fR(3HEAD)
and \fBtypes.h\fR(3HEAD).
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
_
Standard	See \fBstandards\fR(5).
.TE

.SH SEE ALSO
.sp
.LP
\fBfcntl.h\fR(3HEAD), \fBtypes.h\fR(3HEAD), \fBsem_destroy\fR(3C),
\fBsem_getvalue\fR(3C), \fBsem_init\fR(3C), \fBsem_open\fR(3C),
\fBsem_post\fR(3C), \fBsem_timedwait\fR(3C), \fBsem_unlink\fR(3C),
\fBsem_wait\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5)