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.Dd April 4, 1996 32.Dt PTHREAD_GETSPECIFIC 3 33.Os BSD 4 34.Sh NAME 35.Nm pthread_getspecific 36.Nd get a thread-specific data value 37.Sh SYNOPSIS 38.Fd #include <pthread.h> 39.Ft void * 40.Fn pthread_getspecific "pthread_key_t key" 41.Sh DESCRIPTION 42The 43.Fn pthread_getspecific 44function returns the value currently bound to the specified 45.Fa key 46on behalf of the calling thread. 47.Pp 48The effect of calling 49.Fn pthread_getspecific 50with a 51.Fa key 52value not obtained from 53.Fn pthread_key_create 54or after 55.Fa key 56has been deleted with 57.Fn pthread_key_delete 58is undefined. 59.Pp 60.Fn pthread_getspecific 61may be called from a thread-specific data destructor function. 62.Sh RETURN VALUES 63The 64.Fn pthread_getspecific 65function will return the thread-specific data value associated with the given 66.Fa key . 67If no thread-specific data value is associated with 68.Fa key , 69then the value NULL is returned. 70.Sh ERRORS 71None. 72.Sh SEE ALSO 73.Xr pthread_key_create 3 , 74.Xr pthread_key_delete 3 75.Xr pthread_setspecific 3 76.Sh STANDARDS 77.Fn pthread_getspecific 78is expected to conform to IEEE 79.Pq Dq Tn POSIX 80Std 1003.1c when it is published. 81