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.Dd May 31, 2016 26.Dt PTHREAD_RWLOCKATTR_SETPSHARED 3 27.Os 28.Sh NAME 29.Nm pthread_rwlockattr_setpshared 30.Nd set the process shared attribute 31.Sh LIBRARY 32.Lb libpthread 33.Sh SYNOPSIS 34.In pthread.h 35.Ft int 36.Fn pthread_rwlockattr_setpshared "pthread_rwlockattr_t *attr" "int pshared" 37.Sh DESCRIPTION 38The 39.Fn pthread_rwlockattr_setpshared 40function sets the process shared attribute of 41.Fa attr 42to the value referenced by 43.Fa pshared . 44The 45.Fa pshared 46argument 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. 54This is 55the default value. 56.El 57.Sh RETURN VALUES 58If successful, the 59.Fn pthread_rwlockattr_setpshared 60function will return zero. 61Otherwise an error number will be returned 62to indicate the error. 63.Sh ERRORS 64The 65.Fn pthread_rwlockattr_setpshared 66function will fail if: 67.Bl -tag -width Er 68.It Bq Er EINVAL 69The value specified by 70.Fa attr 71or 72.Fa pshared 73is invalid. 74.El 75.Sh SEE ALSO 76.Xr pthread_rwlock_init 3 , 77.Xr pthread_rwlockattr_getpshared 3 , 78.Xr pthread_rwlockattr_init 3 79.Sh STANDARDS 80The 81.Fn pthread_rwlockattr_setpshared 82function is expected to conform to 83.St -susv2 . 84.Sh HISTORY 85The 86.Fn pthread_rwlockattr_setpshared 87function first appeared in 88.Fx 3.0 . 89Support for process-shared read/write locks appeared in 90.Fx 11.0 . 91