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.\" $FreeBSD$ 32.\" 33.Dd April 4, 1996 34.Dt PTHREAD_GETSPECIFIC 3 35.Os 36.Sh NAME 37.Nm pthread_getspecific 38.Nd get a thread-specific data value 39.Sh LIBRARY 40.Lb libc_r 41.Lb libpthread 42.Lb libthr 43.Sh SYNOPSIS 44.In pthread.h 45.Ft void * 46.Fn pthread_getspecific "pthread_key_t key" 47.Sh DESCRIPTION 48The 49.Fn pthread_getspecific 50function returns the value currently bound to the specified 51.Fa key 52on behalf of the calling thread. 53.Pp 54The effect of calling 55.Fn pthread_getspecific 56with a 57.Fa key 58value not obtained from 59.Fn pthread_key_create 60or after 61.Fa key 62has been deleted with 63.Fn pthread_key_delete 64is undefined. 65.Pp 66The 67.Fn pthread_getspecific 68function may be called from a thread-specific data destructor function. 69.Sh RETURN VALUES 70The 71.Fn pthread_getspecific 72function will return the thread-specific data value associated with the given 73.Fa key . 74If no thread-specific data value is associated with 75.Fa key , 76then the value NULL is returned. 77.Sh ERRORS 78None. 79.Sh SEE ALSO 80.Xr pthread_key_create 3 , 81.Xr pthread_key_delete 3 , 82.Xr pthread_setspecific 3 83.Sh STANDARDS 84The 85.Fn pthread_getspecific 86function conforms to 87.St -p1003.1-96 . 88