2004-11-03 13:51:07 +00:00
|
|
|
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
|
2007-06-20 22:33:04 +00:00
|
|
|
.TH "SEM_DESTROY" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
|
2004-11-03 13:51:07 +00:00
|
|
|
.\" sem_destroy
|
2007-09-20 06:03:25 +00:00
|
|
|
.SH PROLOG
|
|
|
|
This manual page is part of the POSIX Programmer's Manual.
|
|
|
|
The Linux implementation of this interface may differ (consult
|
|
|
|
the corresponding Linux manual page for details of Linux behavior),
|
|
|
|
or the interface may not be implemented on Linux.
|
2004-11-03 13:51:07 +00:00
|
|
|
.SH NAME
|
|
|
|
sem_destroy \- destroy an unnamed semaphore (\fBREALTIME\fP)
|
|
|
|
.SH SYNOPSIS
|
|
|
|
.LP
|
|
|
|
\fB#include <semaphore.h>
|
|
|
|
.br
|
|
|
|
.sp
|
|
|
|
int sem_destroy(sem_t *\fP\fIsem\fP\fB); \fP
|
|
|
|
\fB
|
|
|
|
.br
|
|
|
|
\fP
|
|
|
|
.SH DESCRIPTION
|
|
|
|
.LP
|
|
|
|
The \fIsem_destroy\fP() function shall destroy the unnamed semaphore
|
|
|
|
indicated by \fIsem\fP. Only a semaphore that was created
|
|
|
|
using \fIsem_init\fP() may be destroyed using \fIsem_destroy\fP();
|
|
|
|
the effect of calling
|
|
|
|
\fIsem_destroy\fP() with a named semaphore is undefined. The effect
|
|
|
|
of subsequent use of the semaphore \fIsem\fP is undefined
|
|
|
|
until \fIsem\fP is reinitialized by another call to \fIsem_init\fP().
|
|
|
|
.LP
|
|
|
|
It is safe to destroy an initialized 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 VALUE
|
|
|
|
.LP
|
|
|
|
Upon successful completion, a value of zero shall be returned. Otherwise,
|
|
|
|
a value of -1 shall be returned and \fIerrno\fP set
|
|
|
|
to indicate the error.
|
|
|
|
.SH ERRORS
|
|
|
|
.LP
|
|
|
|
The \fIsem_destroy\fP() function shall fail if:
|
|
|
|
.TP 7
|
|
|
|
.B EINVAL
|
|
|
|
The \fIsem\fP argument is not a valid semaphore.
|
|
|
|
.sp
|
|
|
|
.LP
|
|
|
|
The \fIsem_destroy\fP() function may fail if:
|
|
|
|
.TP 7
|
|
|
|
.B EBUSY
|
|
|
|
There are currently processes blocked on the semaphore.
|
|
|
|
.sp
|
|
|
|
.LP
|
|
|
|
\fIThe following sections are informative.\fP
|
|
|
|
.SH EXAMPLES
|
|
|
|
.LP
|
|
|
|
None.
|
|
|
|
.SH APPLICATION USAGE
|
|
|
|
.LP
|
|
|
|
The \fIsem_destroy\fP() function is part of the Semaphores option
|
|
|
|
and need not be available on all implementations.
|
|
|
|
.SH RATIONALE
|
|
|
|
.LP
|
|
|
|
None.
|
|
|
|
.SH FUTURE DIRECTIONS
|
|
|
|
.LP
|
|
|
|
None.
|
|
|
|
.SH SEE ALSO
|
|
|
|
.LP
|
2007-09-20 06:11:55 +00:00
|
|
|
\fIsemctl\fP(), \fIsemget\fP(), \fIsemop\fP()
|
|
|
|
, \fIsem_init\fP(), \fIsem_open\fP(), the Base Definitions volume
|
2004-11-03 13:51:07 +00:00
|
|
|
of
|
|
|
|
IEEE\ Std\ 1003.1-2001, \fI<semaphore.h>\fP
|
|
|
|
.SH COPYRIGHT
|
|
|
|
Portions of this text are reprinted and reproduced in electronic form
|
|
|
|
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
|
|
|
|
-- Portable Operating System Interface (POSIX), The Open Group Base
|
|
|
|
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
|
|
|
|
Electrical and Electronics Engineers, Inc and The Open Group. In the
|
|
|
|
event of any discrepancy between this version and the original IEEE and
|
|
|
|
The Open Group Standard, the original IEEE and The Open Group Standard
|
|
|
|
is the referee document. The original Standard can be obtained online at
|
|
|
|
http://www.opengroup.org/unix/online.html .
|