1#!/bin/sh 2 3# 4# Copyright (c) 2013 Peter Holm <pho@FreeBSD.org> 5# All rights reserved. 6# 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 2. Redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26# SUCH DAMAGE. 27# 28 29# Test scenario by kib@ 30# Demonstrate process looping in kernel mode. 31# Fixed in r251684. 32 33. ../default.cfg 34 35dir=/tmp 36odir=`pwd` 37cd $dir 38sed '1,/^EOF/d' < $odir/$0 > $dir/rwlock_ronly.c 39mycc -o rwlock_ronly -Wall -Wextra rwlock_ronly.c || exit 1 40rm -f rwlock_ronly.c 41cd $odir 42 43/tmp/rwlock_ronly || echo OK 44 45rm -f /tmp/rwlock_ronly 46exit 47 48EOF 49/* $Id: rwlock_ronly.c,v 1.2 2013/06/10 04:44:08 kostik Exp kostik $ */ 50 51#include <sys/types.h> 52#include <sys/mman.h> 53#include <errno.h> 54#include <sys/umtx.h> 55#include <err.h> 56#include <unistd.h> 57 58int 59main(void) 60{ 61 char *p; 62 struct urwlock *rw; 63 int error; 64 65 p = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, 66 MAP_SHARED | MAP_ANON, -1, 0); 67 if (p == (char *)MAP_FAILED) 68 err(1, "mmap"); 69 70 rw = (struct urwlock *)p; 71 rw->rw_state = URWLOCK_READ_WAITERS; 72 73 error = mprotect(p, getpagesize(), PROT_READ); 74 if (error == -1) 75 err(1, "mprotect"); 76 77 error = _umtx_op(p, UMTX_OP_RW_RDLOCK, 0, NULL, NULL); 78 if (error != 0) 79 err(1, "rdlock"); 80 81 return (0); 82} 83