Libc-997.1.1.tar.gz

[apple/libc.git] / pthreads / pthread_getspecific.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_getspecific.3,v 1.6.2.3 2001/08/17 15:42:51 ru Exp $
-.\"
-.Dd April 4, 1996
-.Dt PTHREAD_GETSPECIFIC 3
-.Os
-.Sh NAME
-.Nm pthread_getspecific
-.Nd get a thread-specific data value
-.Sh SYNOPSIS
-.Fd #include <pthread.h>
-.Ft void *
-.Fo pthread_getspecific
-.Fa "pthread_key_t key"
-.Fc
-.Sh DESCRIPTION
-The
-.Fn pthread_getspecific
-function returns the value that is currently bound to the specified
-.Fa key ,
-on behalf of the calling thread.
-.Pp
-The effect of calling
-.Fn pthread_getspecific
-with a
-.Fa key
-value that was not obtained from
-.Fn pthread_key_create ,
-or after a
-.Fa key
-has been deleted with
-.Fn pthread_key_delete ,
-is undefined.
-.Pp
-.Fn pthread_getspecific
-may be called from a thread-specific data destructor function.
-.Sh RETURN VALUES
-The
-.Fn pthread_getspecific
-function will return the thread-specific data value associated with the given
-.Fa key .
-If no thread-specific data value is associated with
-.Fa key ,
-the value NULL is returned.
-.Sh ERRORS
-None.
-.Sh SEE ALSO
-.Xr pthread_key_create 3 ,
-.Xr pthread_key_delete 3 ,
-.Xr pthread_setspecific 3
-.Sh STANDARDS
-.Fn pthread_getspecific
-conforms to
-.St -p1003.1-96 .