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.\" $FreeBSD$ 26.\" 27.Dd August 17, 2018 28.Dt PTHREAD_RWLOCKATTR_GETPSHARED 3 29.Os 30.Sh NAME 31.Nm pthread_rwlockattr_getpshared 32.Nd get the process shared attribute 33.Sh LIBRARY 34.Lb libpthread 35.Sh SYNOPSIS 36.In pthread.h 37.Ft int 38.Fo pthread_rwlockattr_getpshared 39.Fa "const pthread_rwlockattr_t *restrict attr" "int *restrict pshared" 40.Fc 41.Sh DESCRIPTION 42The 43.Fn pthread_rwlockattr_getpshared 44function is used to get the process shared setting of a read/write 45lock attribute object. 46The setting is returned via 47.Fa pshared , 48and may 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. 56This is 57the default value. 58.El 59.Sh RETURN VALUES 60If successful, the 61.Fn pthread_rwlockattr_getpshared 62function will return zero. 63Otherwise an error number will be returned 64to indicate the error. 65.Sh ERRORS 66The 67.Fn pthread_rwlockattr_getpshared 68function may fail if: 69.Bl -tag -width Er 70.It Bq Er EINVAL 71The value specified by 72.Fa attr 73is invalid. 74.El 75.Sh SEE ALSO 76.Xr pthread_rwlock_init 3 , 77.Xr pthread_rwlockattr_init 3 , 78.Xr pthread_rwlockattr_setpshared 3 79.Sh STANDARDS 80The 81.Fn pthread_rwlockattr_getpshared 82function is expected to conform to 83.St -susv2 . 84.Sh HISTORY 85The 86.Fn pthread_rwlockattr_getpshared 87function first appeared in 88.Fx 3.0 . 89