109 lines
3.0 KiB
C
109 lines
3.0 KiB
C
/* $NetBSD: t_filedesc.c,v 1.6 2017/01/13 21:30:41 christos Exp $ */
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/*-
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* Copyright (c) 2010 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: t_filedesc.c,v 1.6 2017/01/13 21:30:41 christos Exp $");
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#include <sys/types.h>
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#include <assert.h>
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#include <atf-c.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <rump/rump.h>
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#include <rump/rump_syscalls.h>
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#include "h_macros.h"
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ATF_TC(getfilerace);
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ATF_TC_HEAD(getfilerace, tc)
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{
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atf_tc_set_md_var(tc, "descr", "race between multithreaded proc. "
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"fd_getfile() and fd_close() (PR kern/43694)");
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}
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static int fd;
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static volatile bool quit;
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static void *
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wrkwrk(void *arg)
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{
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/* just something to cause fd_getfile() to be called */
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while (!quit)
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rump_sys_write(fd, &fd, sizeof(fd));
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return NULL;
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}
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/* for me, 1000 triggers extremely seldom, 10k sometimes, 100k almost always */
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#define DEFAULT_ITERATIONS 10000
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ATF_TC_BODY(getfilerace, tc)
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{
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pthread_t pt;
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int fd_wrk;
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int i, iters;
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/*
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* Want a multiprocessor virtual kernel. A multiprocessor host
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* probably helps too, but that's harder to do in software...
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*/
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setenv("RUMP_NCPU", "2", 1);
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rump_init();
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fd = fd_wrk = rump_sys_open("/dev/null", O_RDWR, 0);
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if (fd == -1)
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atf_tc_fail_errno("cannot open /dev/null");
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if (atf_tc_has_config_var(tc, "iters"))
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iters = atoi(atf_tc_get_config_var(tc, "iters"));
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else
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iters = DEFAULT_ITERATIONS;
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pthread_create(&pt, NULL, wrkwrk, NULL);
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for (i = 0; i < iters; i++) {
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rump_sys_close(fd_wrk);
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fd_wrk = rump_sys_open("/dev/null", O_RDWR, 0);
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assert(fd == fd_wrk);
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}
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quit = true;
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pthread_join(pt, NULL);
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}
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ATF_TP_ADD_TCS(tp)
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{
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ATF_TP_ADD_TC(tp, getfilerace);
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return atf_no_error();
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}
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