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_setpshared.3,v 1.3.2.4 2001/12/17 10:08:26 ru Exp $ 26.\" $DragonFly: src/lib/libc_r/man/pthread_rwlockattr_setpshared.3,v 1.3 2006/02/17 19:35:07 swildner Exp $ 27.\" 28.Dd April 15, 2009 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 LIBRARY 35.Lb libpthread 36.Sh SYNOPSIS 37.In pthread.h 38.Ft int 39.Fn pthread_rwlockattr_setpshared "pthread_rwlockattr_t *attr" "int pshared" 40.Sh DESCRIPTION 41The 42.Fn pthread_rwlockattr_setpshared 43function sets the process shared attribute of 44.Fa attr 45to the value referenced by 46.Fa pshared . 47.Fa pshared 48may be one of two values: 49.Bl -tag -width 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. This is 56the default value. 57.El 58.Sh RETURN VALUES 59If successful, the 60.Fn pthread_rwlockattr_setpshared 61function will return zero. Otherwise an error number will be returned 62to indicate the error. 63.Sh ERRORS 64.Fn pthread_rwlockattr_setpshared 65will fail if: 66.Bl -tag -width Er 67.It Bq Er EINVAL 68The value specified by 69.Fa attr 70or 71.Fa pshared 72is invalid. 73.El 74.Sh SEE ALSO 75.Xr pthread_rwlockattr_init 3 , 76.Xr pthread_rwlockattr_setpshared 3 , 77.Xr pthread_rwlock_init 3 78.Sh STANDARDS 79The 80.Fn pthread_rwlockattr_setpshared 81function is expected to conform to 82.St -susv2 . 83.Sh HISTORY 84The 85.Fn pthread_rwlockattr_setpshared 86function first appeared in 87.Fx 3.0 . 88.Sh BUGS 89The 90.Dv PTHREAD_PROCESS_SHARED 91attribute is not supported. 92