1.\" Copyright (c) 1996 John Birrell <jb@cimlogic.com.au>.
2.\" All rights reserved.
3.\"
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31.\" $FreeBSD: src/share/man/man3/pthread_setspecific.3,v 1.17 2007/10/22 10:08:01 ru Exp $
32.\" $DragonFly: src/lib/libc_r/man/pthread_setspecific.3,v 1.2 2003/06/17 04:26:48 dillon Exp $
33.\"
34.Dd July 10, 2009
35.Dt PTHREAD_SETSPECIFIC 3
36.Os
37.Sh NAME
38.Nm pthread_setspecific
39.Nd set a thread-specific data value
40.Sh LIBRARY
41.Lb libpthread
42.Sh SYNOPSIS
43.In pthread.h
44.Ft int
45.Fn pthread_setspecific "pthread_key_t key" "const void *value"
46.Sh DESCRIPTION
47The
48.Fn pthread_setspecific
49function associates a thread-specific value with a
50.Fa key
51obtained via a previous call to
52.Fn pthread_key_create .
53Different threads can bind different values to the same key.
54These values are
55typically pointers to blocks of dynamically allocated memory that have been
56reserved for use by the calling thread.
57.Pp
58The effect of calling
59.Fn pthread_setspecific
60with a key value not obtained from
61.Fn pthread_key_create
62or after
63.Fa key
64has been deleted with
65.Fn pthread_key_delete
66is undefined.
67.Pp
68The
69.Fn pthread_setspecific
70function may be called from a thread-specific data destructor function,
71however this may result in lost storage or infinite loops.
72.Sh RETURN VALUES
73If successful, the
74.Fn pthread_setspecific
75function will return zero.
76Otherwise an error number will be returned to
77indicate the error.
78.Sh ERRORS
79The
80.Fn pthread_setspecific
81function will fail if:
82.Bl -tag -width Er
83.It Bq Er ENOMEM
84Insufficient memory exists to associate the value with the
85.Fa key .
86.It Bq Er EINVAL
87The
88.Fa key
89value is invalid.
90.El
91.Sh SEE ALSO
92.Xr pthread_getspecific 3 ,
93.Xr pthread_key_create 3 ,
94.Xr pthread_key_delete 3
95.Sh STANDARDS
96The
97.Fn pthread_setspecific
98function conforms to
99.St -p1003.1-96 .
100