t_filedesc.c revision 1.1 
1/*	$NetBSD: t_filedesc.c,v 1.1 2010/08/02 10:29:48 pooka Exp $	*/
2
3/*-
4 * Copyright (c) 2010 The NetBSD Foundation, Inc.
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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__RCSID("$NetBSD: t_filedesc.c,v 1.1 2010/08/02 10:29:48 pooka Exp $");
31
32#include <sys/types.h>
33
34#include <assert.h>
35#include <atf-c.h>
36#include <fcntl.h>
37#include <stdlib.h>
38
39#include <rump/rump.h>
40#include <rump/rump_syscalls.h>
41
42#include "../h_macros.h"
43
44ATF_TC(getfilerace);
45ATF_TC_HEAD(getfilerace, tc)
46{
47
48	atf_tc_set_md_var(tc, "descr", "race between multithreaded proc. "
49	    "fd_getfile() and fd_close()");
50}
51
52static int fd;
53static volatile bool quit;
54
55static void *
56wrkwrk(void *arg)
57{
58
59	/* just something to cause fd_getfile() to be called */
60	while (!quit)
61		rump_sys_write(fd, &fd, sizeof(fd));
62
63	return NULL;
64}
65
66/* for me, 1000 triggers extremely seldom, 10k sometimes, 100k almost always */
67#define DEFAULT_ITERATIONS 10000
68
69ATF_TC_BODY(getfilerace, tc)
70{
71	pthread_t pt;
72	int fd_wrk;
73	int i, iters;
74
75	/*
76	 * Want a multiprocessor virtual kernel.  A multiprocessor host
77	 * probably helps too, but that's harder to do in software...
78	 */
79	setenv("RUMP_NCPU", "2", 1);
80	rump_init();
81
82	fd = fd_wrk = rump_sys_open("/dev/null", O_RDWR, 0);
83	if (fd == -1)
84		atf_tc_fail_errno("cannot open /dev/null");
85
86	if (atf_tc_has_config_var(tc, "iters"))
87		iters = atoi(atf_tc_get_config_var(tc, "iters"));
88	else
89		iters = DEFAULT_ITERATIONS;
90
91	pthread_create(&pt, NULL, wrkwrk, NULL);
92	atf_tc_expect_signal(-1, "PR kern/43694");
93	for (i = 0; i < iters; i++) {
94		rump_sys_close(fd_wrk);
95		fd_wrk = rump_sys_open("/dev/null", O_RDWR, 0);
96		assert(fd == fd_wrk);
97	}
98
99	quit = true;
100	pthread_join(pt, NULL);
101
102	/* XXX: ridiculous */
103	abort();
104}
105
106ATF_TP_ADD_TCS(tp)
107{
108	ATF_TP_ADD_TC(tp, getfilerace);
109
110	return atf_no_error();
111}
112