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 March 22, 1999 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 libc_r 35.Lb libpthread 36.Lb libthr 37.Sh SYNOPSIS 38.In pthread.h 39.Ft int 40.Fn pthread_rwlockattr_getpshared "const pthread_rwlockattr_t *attr" "int *pshared" 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. The setting is returned via 46.Fa pshared , 47and may be one of two values: 48.Bl -tag -width PTHREAD_PROCESS_PRIVATE 49.It Dv PTHREAD_PROCESS_SHARED 50Any thread of any process that has access to the memory where the 51read/write lock resides can manipulate the lock. 52.It Dv PTHREAD_PROCESS_PRIVATE 53Only threads created within the same process as the thread that 54initialized the read/write lock can manipulate the lock. This is 55the default value. 56.El 57.Sh RETURN VALUES 58If successful, the 59.Fn pthread_rwlockattr_getpshared 60function will return zero. Otherwise an error number will be returned 61to indicate the error. 62.Sh SEE ALSO 63.Xr pthread_rwlockattr_init 3 , 64.Xr pthread_rwlockattr_setpshared 3 , 65.Xr pthread_rwlock_init 3 66.Sh STANDARDS 67The 68.Fn pthread_rwlockattr_getpshared 69function is expected to conform to 70.St -susv2 . 71.Sh ERRORS 72The 73.Fn pthread_rwlockattr_getpshared 74function may fail if: 75.Bl -tag -width Er 76.It Bq Er EINVAL 77The value specified by 78.Fa attr 79is invalid. 80.El 81.Sh HISTORY 82The 83.Fn pthread_rwlockattr_getpshared 84function first appeared in 85.Fx 3.0 . 86