1.\" $NetBSD: pthread_getspecific.3,v 1.2 2003/06/08 06:44:31 thorpej Exp $ 2.\" 3.\" Copyright (c) 2002 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. Neither the name of The NetBSD Foundation nor the names of its 14.\" contributors may be used to endorse or promote products derived 15.\" from this software without specific prior written permission. 16.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26.\" POSSIBILITY OF SUCH DAMAGE. 27.\" 28.\" Copyright (c) 1996 John Birrell <jb@cimlogic.com.au>. 29.\" All rights reserved. 30.\" 31.\" Redistribution and use in source and binary forms, with or without 32.\" modification, are permitted provided that the following conditions 33.\" are met: 34.\" 1. Redistributions of source code must retain the above copyright 35.\" notice, this list of conditions and the following disclaimer. 36.\" 2. Redistributions in binary form must reproduce the above copyright 37.\" notice, this list of conditions and the following disclaimer in the 38.\" documentation and/or other materials provided with the distribution. 39.\" 3. All advertising materials mentioning features or use of this software 40.\" must display the following acknowledgement: 41.\" This product includes software developed by John Birrell. 42.\" 4. Neither the name of the author nor the names of any co-contributors 43.\" may be used to endorse or promote products derived from this software 44.\" without specific prior written permission. 45.\" 46.\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 47.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 48.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 49.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 50.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 51.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 52.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 53.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 54.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 55.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 56.\" SUCH DAMAGE. 57.\" 58.\" $FreeBSD: src/lib/libpthread/man/pthread_getspecific.3,v 1.11 2002/09/16 19:29:28 mini Exp $ 59.\" 60.Dd January 30, 2003 61.Dt PTHREAD_GETSPECIFIC 3 62.Os 63.Sh NAME 64.Nm pthread_getspecific 65.Nd get a thread-specific data value 66.Sh LIBRARY 67.Lb libpthread 68.Sh SYNOPSIS 69.In pthread.h 70.Ft void * 71.Fn pthread_getspecific "pthread_key_t key" 72.Sh DESCRIPTION 73The 74.Fn pthread_getspecific 75function returns the value currently bound to the specified 76.Fa key 77on behalf of the calling thread. 78.Pp 79The effect of calling 80.Fn pthread_getspecific 81with a 82.Fa key 83value not obtained from 84.Fn pthread_key_create 85or after 86.Fa key 87has been deleted with 88.Fn pthread_key_delete 89is undefined. 90.Pp 91.Fn pthread_getspecific 92may be called from a thread-specific data destructor function. 93.Sh RETURN VALUES 94The 95.Fn pthread_getspecific 96function will return the thread-specific data value associated with the given 97.Fa key . 98If no thread-specific data value is associated with 99.Fa key , 100then the value NULL is returned. 101.Sh ERRORS 102None. 103.Sh SEE ALSO 104.Xr pthread_key_create 3 , 105.Xr pthread_key_delete 3 , 106.Xr pthread_setspecific 3 107.Sh STANDARDS 108.Fn pthread_getspecific 109conforms to 110.St -p1003.1-96 . 111