1.\" $OpenBSD: pthread_rwlockattr_getpshared.3,v 1.10 2013/06/05 03:44:50 tedu Exp $ 2.\" Copyright (c) 1998 Alex Nash 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD: pthread_rwlockattr_getpshared.3,v 1.4 1999/08/28 00:03:10 peter Exp $ 27.\" 28.Dd $Mdocdate: June 5 2013 $ 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 SYNOPSIS 35.In pthread.h 36.Ft int 37.Fn pthread_rwlockattr_getpshared "const pthread_rwlockattr_t *attr" "int *pshared" 38.Sh DESCRIPTION 39The 40.Fn pthread_rwlockattr_getpshared 41function is used to get the process shared setting of a read/write 42lock attribute object. 43The setting is returned via 44.Fa pshared , 45and may be one of two values: 46.Bl -hang -offset flag -width 123456789012345678901234 47.It Ar PTHREAD_PROCESS_SHARED 48Any thread of any process that has access to the memory where the 49read/write lock resides can manipulate the lock. 50.It Ar PTHREAD_PROCESS_PRIVATE 51Only threads created within the same process as the thread that 52initialized the read/write lock can manipulate the lock. 53This is the default value. 54.El 55.Sh RETURN VALUES 56If successful, the 57.Fn pthread_rwlockattr_getpshared 58function will return zero. 59Otherwise an error number will be returned to indicate the error. 60.Sh ERRORS 61.Fn pthread_rwlockattr_getpshared 62may fail if: 63.Bl -tag -width Er 64.It Bq Er EINVAL 65The value specified by 66.Fa attr 67is invalid. 68.El 69.Sh SEE ALSO 70.Xr pthread_rwlock_init 3 , 71.Xr pthread_rwlockattr_init 3 , 72.Xr pthread_rwlockattr_setpshared 3 73.Sh STANDARDS 74The 75.Fn pthread_rwlockattr_getpshared 76function is expected to conform to 77.St -susv2 . 78.Sh HISTORY 79The 80.Fn pthread_rwlockattr_getpshared 81function first appeared in 82.Fx 3.0 83and 84.Ox 2.5 . 85