1/*	$NetBSD: t_filedesc.c,v 1.3 2010/08/04 14:28:28 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 1.3 2010/08/04 14:28:28 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#include <pthread.h>
39
40#include <rump/rump.h>
41#include <rump/rump_syscalls.h>
42
43#include "../h_macros.h"
44
45ATF_TC(getfilerace);
46ATF_TC_HEAD(getfilerace, tc)
47{
48
49	atf_tc_set_md_var(tc, "descr", "race between multithreaded proc. "
50	    "fd_getfile() and fd_close()");
51	/* PR kern/43694 */
52}
53
54static int fd;
55static volatile bool quit;
56
57static void *
58wrkwrk(void *arg)
59{
60
61	/* just something to cause fd_getfile() to be called */
62	while (!quit)
63		rump_sys_write(fd, &fd, sizeof(fd));
64
65	return NULL;
66}
67
68/* for me, 1000 triggers extremely seldom, 10k sometimes, 100k almost always */
69#define DEFAULT_ITERATIONS 10000
70
71ATF_TC_BODY(getfilerace, tc)
72{
73	pthread_t pt;
74	int fd_wrk;
75	int i, iters;
76
77	/*
78	 * Want a multiprocessor virtual kernel.  A multiprocessor host
79	 * probably helps too, but that's harder to do in software...
80	 */
81	setenv("RUMP_NCPU", "2", 1);
82	rump_init();
83
84	fd = fd_wrk = rump_sys_open("/dev/null", O_RDWR, 0);
85	if (fd == -1)
86		atf_tc_fail_errno("cannot open /dev/null");
87
88	if (atf_tc_has_config_var(tc, "iters"))
89		iters = atoi(atf_tc_get_config_var(tc, "iters"));
90	else
91		iters = DEFAULT_ITERATIONS;
92
93	pthread_create(&pt, NULL, wrkwrk, NULL);
94	for (i = 0; i < iters; i++) {
95		rump_sys_close(fd_wrk);
96		fd_wrk = rump_sys_open("/dev/null", O_RDWR, 0);
97		assert(fd == fd_wrk);
98	}
99
100	quit = true;
101	pthread_join(pt, NULL);
102}
103
104ATF_TP_ADD_TCS(tp)
105{
106	ATF_TP_ADD_TC(tp, getfilerace);
107
108	return atf_no_error();
109}
110