1.\" Copyright (c) 1998 Alex Nash
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25.\" $FreeBSD: src/share/man/man3/pthread_rwlockattr_setpshared.3,v 1.15 2007/10/22 10:08:01 ru Exp $
26.\"
27.Dd July 10, 2009
28.Dt PTHREAD_RWLOCKATTR_SETPSHARED 3
29.Os
30.Sh NAME
31.Nm pthread_rwlockattr_setpshared
32.Nd set the process shared attribute
33.Sh LIBRARY
34.Lb libpthread
35.Sh SYNOPSIS
36.In pthread.h
37.Ft int
38.Fn pthread_rwlockattr_setpshared "pthread_rwlockattr_t *attr" "int pshared"
39.Sh DESCRIPTION
40The
41.Fn pthread_rwlockattr_setpshared
42function sets the process shared attribute of
43.Fa attr
44to the value referenced by
45.Fa pshared .
46The
47.Fa pshared
48argument may be one of two values:
49.Bl -tag -width ".Dv PTHREAD_PROCESS_PRIVATE"
50.It Dv PTHREAD_PROCESS_SHARED
51Any thread of any process that has access to the memory where the
52read/write lock resides can manipulate the lock.
53.It Dv PTHREAD_PROCESS_PRIVATE
54Only threads created within the same process as the thread that
55initialized the read/write lock can manipulate the lock.
56This is
57the default value.
58.El
59.Sh RETURN VALUES
60If successful, the
61.Fn pthread_rwlockattr_setpshared
62function will return zero.
63Otherwise an error number will be returned
64to indicate the error.
65.Sh ERRORS
66The
67.Fn pthread_rwlockattr_setpshared
68function will fail if:
69.Bl -tag -width Er
70.It Bq Er EINVAL
71The value specified by
72.Fa attr
73or
74.Fa pshared
75is invalid.
76.El
77.Sh SEE ALSO
78.Xr pthread_rwlockattr_getpshared 3 ,
79.Xr pthread_rwlockattr_init 3 ,
80.Xr pthread_rwlock_init 3
81.Sh STANDARDS
82The
83.Fn pthread_rwlockattr_setpshared
84function is expected to conform to
85.St -susv2 .
86.Sh HISTORY
87The
88.Fn pthread_rwlockattr_setpshared
89function first appeared in
90.Fx 3.0 .
91.Sh BUGS
92The
93.Dv PTHREAD_PROCESS_SHARED
94attribute is not supported.
95