1.\" Copyright (c) 1998 Alex Nash
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25.\" $FreeBSD: src/lib/libc_r/man/pthread_rwlockattr_getpshared.3,v 1.4.2.4 2001/12/17 10:08:26 ru Exp $
26.\" $DragonFly: src/lib/libc_r/man/pthread_rwlockattr_getpshared.3,v 1.3 2006/02/17 19:35:07 swildner Exp $
27.\"
28.Dd April 15, 2009
29.Dt PTHREAD_RWLOCKATTR_GETPSHARED 3
30.Os
31.Sh NAME
32.Nm pthread_rwlockattr_getpshared
33.Nd get the process shared attribute
34.Sh LIBRARY
35.Lb libpthread
36.Sh SYNOPSIS
37.In pthread.h
38.Ft int
39.Fn pthread_rwlockattr_getpshared "const pthread_rwlockattr_t *attr" "int *pshared"
40.Sh DESCRIPTION
41The
42.Fn pthread_rwlockattr_getpshared
43function is used to get the process shared setting of a read/write
44lock attribute object.  The setting is returned via
45.Fa pshared ,
46and may be one of two values:
47.Bl -tag -width PTHREAD_PROCESS_PRIVATE
48.It Dv 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 Dv 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_getpshared
59function will return zero.  Otherwise an error number will be returned
60to indicate the error.
61.Sh ERRORS
62.Fn pthread_rwlockattr_getpshared
63may fail if:
64.Bl -tag -width Er
65.It Bq Er EINVAL
66The value specified by
67.Fa attr
68is invalid.
69.El
70.Sh SEE ALSO
71.Xr pthread_rwlockattr_init 3 ,
72.Xr pthread_rwlockattr_setpshared 3 ,
73.Xr pthread_rwlock_init 3
74.Sh STANDARDS
75The
76.Fn pthread_rwlockattr_getpshared
77function is expected to conform to
78.St -susv2 .
79.Sh HISTORY
80The
81.Fn pthread_rwlockattr_getpshared
82function first appeared in
83.Fx 3.0 .
84