1*8a272653SPeter Holm#!/bin/sh 2*8a272653SPeter Holm 3*8a272653SPeter Holm# 4*8a272653SPeter Holm# Copyright (c) 2013 Peter Holm <pho@FreeBSD.org> 5*8a272653SPeter Holm# All rights reserved. 6*8a272653SPeter Holm# 7*8a272653SPeter Holm# Redistribution and use in source and binary forms, with or without 8*8a272653SPeter Holm# modification, are permitted provided that the following conditions 9*8a272653SPeter Holm# are met: 10*8a272653SPeter Holm# 1. Redistributions of source code must retain the above copyright 11*8a272653SPeter Holm# notice, this list of conditions and the following disclaimer. 12*8a272653SPeter Holm# 2. Redistributions in binary form must reproduce the above copyright 13*8a272653SPeter Holm# notice, this list of conditions and the following disclaimer in the 14*8a272653SPeter Holm# documentation and/or other materials provided with the distribution. 15*8a272653SPeter Holm# 16*8a272653SPeter Holm# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17*8a272653SPeter Holm# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18*8a272653SPeter Holm# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19*8a272653SPeter Holm# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20*8a272653SPeter Holm# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21*8a272653SPeter Holm# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22*8a272653SPeter Holm# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23*8a272653SPeter Holm# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24*8a272653SPeter Holm# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25*8a272653SPeter Holm# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26*8a272653SPeter Holm# SUCH DAMAGE. 27*8a272653SPeter Holm# 28*8a272653SPeter Holm 29*8a272653SPeter Holm# Test scenario by kib@ 30*8a272653SPeter Holm# Demonstrate process looping in kernel mode. 31*8a272653SPeter Holm# Fixed in r251684. 32*8a272653SPeter Holm 33*8a272653SPeter Holm. ../default.cfg 34*8a272653SPeter Holm 35*8a272653SPeter Holmdir=/tmp 36*8a272653SPeter Holmodir=`pwd` 37*8a272653SPeter Holmcd $dir 38*8a272653SPeter Holmsed '1,/^EOF/d' < $odir/$0 > $dir/rwlock_ronly.c 39*8a272653SPeter Holmmycc -o rwlock_ronly -Wall -Wextra rwlock_ronly.c || exit 1 40*8a272653SPeter Holmrm -f rwlock_ronly.c 41*8a272653SPeter Holmcd $odir 42*8a272653SPeter Holm 43*8a272653SPeter Holm/tmp/rwlock_ronly || echo OK 44*8a272653SPeter Holm 45*8a272653SPeter Holmrm -f /tmp/rwlock_ronly 46*8a272653SPeter Holmexit 47*8a272653SPeter Holm 48*8a272653SPeter HolmEOF 49*8a272653SPeter Holm/* $Id: rwlock_ronly.c,v 1.2 2013/06/10 04:44:08 kostik Exp kostik $ */ 50*8a272653SPeter Holm 51*8a272653SPeter Holm#include <sys/types.h> 52*8a272653SPeter Holm#include <sys/mman.h> 53*8a272653SPeter Holm#include <errno.h> 54*8a272653SPeter Holm#include <sys/umtx.h> 55*8a272653SPeter Holm#include <err.h> 56*8a272653SPeter Holm#include <unistd.h> 57*8a272653SPeter Holm 58*8a272653SPeter Holmint 59*8a272653SPeter Holmmain(void) 60*8a272653SPeter Holm{ 61*8a272653SPeter Holm char *p; 62*8a272653SPeter Holm struct urwlock *rw; 63*8a272653SPeter Holm int error; 64*8a272653SPeter Holm 65*8a272653SPeter Holm p = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, 66*8a272653SPeter Holm MAP_SHARED | MAP_ANON, -1, 0); 67*8a272653SPeter Holm if (p == (char *)MAP_FAILED) 68*8a272653SPeter Holm err(1, "mmap"); 69*8a272653SPeter Holm 70*8a272653SPeter Holm rw = (struct urwlock *)p; 71*8a272653SPeter Holm rw->rw_state = URWLOCK_READ_WAITERS; 72*8a272653SPeter Holm 73*8a272653SPeter Holm error = mprotect(p, getpagesize(), PROT_READ); 74*8a272653SPeter Holm if (error == -1) 75*8a272653SPeter Holm err(1, "mprotect"); 76*8a272653SPeter Holm 77*8a272653SPeter Holm error = _umtx_op(p, UMTX_OP_RW_RDLOCK, 0, NULL, NULL); 78*8a272653SPeter Holm if (error != 0) 79*8a272653SPeter Holm err(1, "rdlock"); 80*8a272653SPeter Holm 81*8a272653SPeter Holm return (0); 82*8a272653SPeter Holm} 83