1.\" Copyright (c) 1996 John Birrell <jb@cimlogic.com.au>.
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31.\" $FreeBSD: src/share/man/man3/pthread_getspecific.3,v 1.15 2007/10/22 10:08:00 ru Exp $
32.\"
33.Dd July 10, 2009
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 libpthread
41.Sh SYNOPSIS
42.In pthread.h
43.Ft void *
44.Fn pthread_getspecific "pthread_key_t key"
45.Sh DESCRIPTION
46The
47.Fn pthread_getspecific
48function returns the value currently bound to the specified
49.Fa key
50on behalf of the calling thread.
51.Pp
52The effect of calling
53.Fn pthread_getspecific
54with a
55.Fa key
56value not obtained from
57.Fn pthread_key_create
58or after
59.Fa key
60has been deleted with
61.Fn pthread_key_delete
62is undefined.
63.Pp
64The
65.Fn pthread_getspecific
66function may 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
82The
83.Fn pthread_getspecific
84function conforms to
85.St -p1003.1-96 .
86