/* $NetBSD: t_filedesc.c,v 1.5 2012/03/18 09:46:50 jruoho Exp $ */
/*-
* Copyright (c) 2010 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: t_filedesc.c,v 1.5 2012/03/18 09:46:50 jruoho Exp $");
#include <sys/types.h>
#include <assert.h>
#include <atf-c.h>
#include <fcntl.h>
#include <stdlib.h>
#include <pthread.h>
#include <rump/rump.h>
#include <rump/rump_syscalls.h>
#include "../h_macros.h"
ATF_TC(getfilerace);
ATF_TC_HEAD(getfilerace, tc)
{
atf_tc_set_md_var(tc, "descr", "race between multithreaded proc. "
"fd_getfile() and fd_close() (PR kern/43694)");
}
static int fd;
static volatile bool quit;
static void *
wrkwrk(void *arg)
{
/* just something to cause fd_getfile() to be called */
while (!quit)
rump_sys_write(fd, &fd, sizeof(fd));
return NULL;
}
/* for me, 1000 triggers extremely seldom, 10k sometimes, 100k almost always */
#define DEFAULT_ITERATIONS 10000
ATF_TC_BODY(getfilerace, tc)
{
pthread_t pt;
int fd_wrk;
int i, iters;
/*
* Want a multiprocessor virtual kernel. A multiprocessor host
* probably helps too, but that's harder to do in software...
*/
setenv("RUMP_NCPU", "2", 1);
rump_init();
fd = fd_wrk = rump_sys_open("/dev/null", O_RDWR, 0);
if (fd == -1)
atf_tc_fail_errno("cannot open /dev/null");
if (atf_tc_has_config_var(tc, "iters"))
iters = atoi(atf_tc_get_config_var(tc, "iters"));
else
iters = DEFAULT_ITERATIONS;
pthread_create(&pt, NULL, wrkwrk, NULL);
for (i = 0; i < iters; i++) {
rump_sys_close(fd_wrk);
fd_wrk = rump_sys_open("/dev/null", O_RDWR, 0);
assert(fd == fd_wrk);
}
quit = true;
pthread_join(pt, NULL);
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, getfilerace);
return atf_no_error();
}
