Libc-997.1.1.tar.gz

[apple/libc.git] / pthreads / pthread_key_delete.3

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-.\" Copyright (c) 1996 John Birrell <jb@cimlogic.com.au>.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"    This product includes software developed by John Birrell.
-.\" 4. Neither the name of the author nor the names of any co-contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $FreeBSD: src/lib/libc_r/man/pthread_key_delete.3,v 1.6.2.4 2001/08/17 15:42:51 ru Exp $
-.\"
-.Dd April 4, 1996
-.Dt PTHREAD_KEY_DELETE 3
-.Os
-.Sh NAME
-.Nm pthread_key_delete
-.Nd delete a thread-specific data key
-.Sh SYNOPSIS
-.Fd #include <pthread.h>
-.Ft int
-.Fo pthread_key_delete
-.Fa "pthread_key_t key"
-.Fc
-.Sh DESCRIPTION
-The
-.Fn pthread_key_delete
-function deletes a thread-specific data key, previously returned by
-.Fn pthread_key_create .
-The thread-specific data values associated with
-.Fa key
-need not be NULL at the time that
-.Fn pthread_key_delete
-is called.
-It is the responsibility of the application to free any
-application storage or perform any cleanup actions for data structures
-related to the deleted key or associated thread-specific data in any threads;
-this cleanup can be done either before or after
-.Fn pthread_key_delete
-is called.
-Any attempt to use
-.Fa key
-following the call to
-.Fn pthread_key_delete
-results in undefined behavior.
-.Pp
-The
-.Fn pthread_key_delete
-function is callable from within destructor functions.
-Destructor functions
-are not invoked by
-.Fn pthread_key_delete .
-Any destructor function that may have been associated with
-.Fa key
-will no longer be called upon thread exit.
-.Sh RETURN VALUES
-If successful, the
-.Fn pthread_key_delete
-function will return zero.
-Otherwise, an error number will be returned to
-indicate the error.
-.Sh ERRORS
-.Fn pthread_key_delete
-will fail if:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The
-.Fa key
-value is invalid.
-.El
-.Sh SEE ALSO
-.Xr pthread_getspecific 3 ,
-.Xr pthread_key_create 3 ,
-.Xr pthread_setspecific 3
-.Sh STANDARDS
-.Fn pthread_key_delete
-conforms to
-.St -p1003.1-96 .