'\" te
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.TH SEM_DESTROY 3C "Feb 5, 2008"
.SH NAME
sem_destroy \- destroy an unnamed semaphore
.SH SYNOPSIS
.LP
.nf
#include <semaphore.h>

\fBint\fR \fBsem_destroy\fR(\fBsem_t *\fR\fIsem\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBsem_destroy()\fR function is used to destroy the unnamed semaphore
indicated by \fIsem\fR. Only a semaphore that was created using
\fBsem_init\fR(3C) may be destroyed using \fBsem_destroy()\fR; the effect of
calling \fBsem_destroy()\fR with a named semaphore is undefined. The effect of
subsequent use of the semaphore \fIsem\fR is undefined until \fIsem\fR is
re-initialized by another call to \fBsem_init\fR(3C).
.sp
.LP
It is safe to destroy an initialised semaphore upon which no threads are
currently blocked. The effect of destroying a semaphore upon which other
threads  are currently blocked is undefined.
.SH RETURN VALUES
.sp
.LP
If successful, \fBsem_destroy()\fR returns \fB0\fR, otherwise it returns
\fB\(mi1\fR and sets \fBerrno\fR to indicate the error.
.SH ERRORS
.sp
.LP
The  \fBsem_destroy()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR \fR
.ad
.RS 11n
The \fIsem\fR argument is not a valid semaphore.
.RE

.sp
.LP
The \fBsem_destroy()\fR function may fail if:
.sp
.ne 2
.na
\fB\fBEBUSY\fR \fR
.ad
.RS 10n
There are currently processes (or LWPs or threads) blocked on the semaphore.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

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

.SH SEE ALSO
.sp
.LP
\fBsem_init\fR(3C), \fBsem_open\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5)