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 SYNOPSIS 34.Fd #include <pthread.h> 35.Ft int 36.Fn pthread_rwlockattr_getpshared "const pthread_rwlockattr_t *attr" "int *pshared" 37.Sh DESCRIPTION 38The 39.Fn pthread_rwlockattr_getpshared 40function is used to get the process shared setting of a read/write 41lock attribute object. The setting is returned via 42.Fa pshared , 43and may be one of two values: 44.Bl -hang -offset flag -width 123456789012345678901234 45.It Ar PTHREAD_PROCESS_SHARED 46Any thread of any process that has access to the memory where the 47read/write lock resides can manipulate the lock. 48.It Ar PTHREAD_PROCESS_PRIVATE 49Only threads created within the same process as the thread that 50initialized the read/write lock can manipulate the lock. This is 51the default value. 52.El 53.Sh RETURN VALUES 54If successful, the 55.Fn pthread_rwlockattr_getpshared 56function will return zero. Otherwise an error number will be returned 57to indicate the error. 58.Sh SEE ALSO 59.Xr pthread_rwlock_init 3 , 60.Xr pthread_rwlockattr_init 3 , 61.Xr pthread_rwlockattr_setpshared 3 62.Sh STANDARDS 63The 64.Fn pthread_rwlockattr_getpshared 65function is expected to conform to 66.St -susv2 . 67.Sh ERRORS 68.Fn pthread_rwlockattr_getpshared 69may fail if: 70.Bl -tag -width Er 71.It Bq Er EINVAL 72The value specified by 73.Fa attr 74is invalid. 75.El 76.Sh HISTORY 77The 78.Fn pthread_rwlockattr_getpshared 79function first appeared in 80.Fx 3.0 . 81