1.\" Copyright (c) 1996 John Birrell <jb@cimlogic.com.au>. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by John Birrell. 15.\" 4. Neither the name of the author nor the names of any co-contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" $FreeBSD: src/lib/libc_r/man/pthread_getspecific.3,v 1.6.2.4 2001/12/17 10:08:26 ru Exp $ 32.\" $DragonFly: src/lib/libc_r/man/pthread_getspecific.3,v 1.2 2003/06/17 04:26:48 dillon Exp $ 33.\" 34.Dd April 15, 2009 35.Dt PTHREAD_GETSPECIFIC 3 36.Os 37.Sh NAME 38.Nm pthread_getspecific 39.Nd get a thread-specific data value 40.Sh LIBRARY 41.Lb libpthread 42.Sh SYNOPSIS 43.In pthread.h 44.Ft void * 45.Fn pthread_getspecific "pthread_key_t key" 46.Sh DESCRIPTION 47The 48.Fn pthread_getspecific 49function returns the value currently bound to the specified 50.Fa key 51on behalf of the calling thread. 52.Pp 53The effect of calling 54.Fn pthread_getspecific 55with a 56.Fa key 57value not obtained from 58.Fn pthread_key_create 59or after 60.Fa key 61has been deleted with 62.Fn pthread_key_delete 63is undefined. 64.Pp 65.Fn pthread_getspecific 66may be called from a thread-specific data destructor function. 67.Sh RETURN VALUES 68The 69.Fn pthread_getspecific 70function will return the thread-specific data value associated with the given 71.Fa key . 72If no thread-specific data value is associated with 73.Fa key , 74then the value NULL is returned. 75.Sh ERRORS 76None. 77.Sh SEE ALSO 78.Xr pthread_key_create 3 , 79.Xr pthread_key_delete 3 , 80.Xr pthread_setspecific 3 81.Sh STANDARDS 82.Fn pthread_getspecific 83conforms to 84.St -p1003.1-96 . 85