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77 lines
2.4 KiB
Plaintext
77 lines
2.4 KiB
Plaintext
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "SEM_DESTROY" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" sem_destroy
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.SH NAME
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sem_destroy \- destroy an unnamed semaphore (\fBREALTIME\fP)
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.SH SYNOPSIS
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.LP
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\fB#include <semaphore.h>
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.br
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.sp
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int sem_destroy(sem_t *\fP\fIsem\fP\fB); \fP
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\fB
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.br
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\fP
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.SH DESCRIPTION
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.LP
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The \fIsem_destroy\fP() function shall destroy the unnamed semaphore
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indicated by \fIsem\fP. Only a semaphore that was created
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using \fIsem_init\fP() may be destroyed using \fIsem_destroy\fP();
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the effect of calling
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\fIsem_destroy\fP() with a named semaphore is undefined. The effect
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of subsequent use of the semaphore \fIsem\fP is undefined
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until \fIsem\fP is reinitialized by another call to \fIsem_init\fP().
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.LP
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It is safe to destroy an initialized semaphore upon which no threads
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are currently blocked. The effect of destroying a semaphore
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upon which other threads are currently blocked is undefined.
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.SH RETURN VALUE
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.LP
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Upon successful completion, a value of zero shall be returned. Otherwise,
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a value of -1 shall be returned and \fIerrno\fP set
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to indicate the error.
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.SH ERRORS
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.LP
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The \fIsem_destroy\fP() function shall fail if:
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.TP 7
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.B EINVAL
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The \fIsem\fP argument is not a valid semaphore.
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.sp
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.LP
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The \fIsem_destroy\fP() function may fail if:
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.TP 7
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.B EBUSY
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There are currently processes blocked on the semaphore.
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.sp
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.LP
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\fIThe following sections are informative.\fP
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.SH EXAMPLES
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.LP
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None.
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.SH APPLICATION USAGE
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.LP
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The \fIsem_destroy\fP() function is part of the Semaphores option
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and need not be available on all implementations.
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fIsemctl\fP() , \fIsemget\fP() , \fIsemop\fP()
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, \fIsem_init\fP() , \fIsem_open\fP() , the Base Definitions volume
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of
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IEEE\ Std\ 1003.1-2001, \fI<semaphore.h>\fP
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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