.\" Copyright (c) 1996 John Birrell <jb@cimlogic.com.au>.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
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.\"    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
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.\" $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 .