1.\" Copyright (c) 1998 Alex Nash 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 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