1.\" $OpenBSD: pthread_rwlockattr_setpshared.3,v 1.5 2000/04/12 21:48:03 aaron Exp $
2.\" Copyright (c) 1998 Alex Nash
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26.\" $FreeBSD: pthread_rwlockattr_setpshared.3,v 1.2 1999/08/28 00:03:11 peter Exp $
27.\"
28.Dd August 4, 1998
29.Dt PTHREAD_RWLOCKATTR_SETPSHARED 3
30.Os
31.Sh NAME
32.Nm pthread_rwlockattr_setpshared
33.Nd set the process shared attribute
34.Sh SYNOPSIS
35.Fd #include <pthread.h>
36.Ft int
37.Fn pthread_rwlockattr_setpshared "pthread_rwlockattr_t *attr" "int pshared"
38.Sh DESCRIPTION
39The
40.Fn pthread_rwlockattr_setpshared
41function sets the process shared attribute of
42.Fa attr
43to the value referenced by
44.Fa pshared .
45.Fa pshared
46may be one of two values:
47.Bl -hang -offset flag -width 123456789012345678901234
48.It Ar PTHREAD_PROCESS_SHARED
49Any thread of any process that has access to the memory where the
50read/write lock resides can manipulate the lock.
51.It Ar PTHREAD_PROCESS_PRIVATE
52Only threads created within the same process as the thread that
53initialized the read/write lock can manipulate the lock.  This is
54the default value.
55.El
56.Sh RETURN VALUES
57If successful, the
58.Fn pthread_rwlockattr_setpshared
59function will return zero.  Otherwise an error number will be returned
60to indicate the error.
61.Sh SEE ALSO
62.Xr pthread_rwlock_init 3 ,
63.Xr pthread_rwlockattr_init 3 ,
64.Xr pthread_rwlockattr_setpshared 3
65.Sh STANDARDS
66The
67.Fn pthread_rwlockattr_setpshared
68function is expected to conform to
69.St -susv2 .
70.Sh ERRORS
71.Fn pthread_rwlockattr_setpshared
72will fail if:
73.Bl -tag -width Er
74.It Bq Er EINVAL
75The value specified by
76.Fa attr
77or
78.Fa pshared
79is invalid.
80.El
81.Sh HISTORY
82The
83.Fn pthread_rwlockattr_setpshared
84function first appeared in
85.Fx 3.0
86and
87.Ox 2.5 .
88.Sh BUGS
89The PTHREAD_PROCESS_SHARED attribute is not supported.
90