1314817Sngie/* $NetBSD: t_filedesc.c,v 1.6 2017/01/13 21:30:41 christos Exp $ */ 2272343Sngie 3272343Sngie/*- 4272343Sngie * Copyright (c) 2010 The NetBSD Foundation, Inc. 5272343Sngie * All rights reserved. 6272343Sngie * 7272343Sngie * Redistribution and use in source and binary forms, with or without 8272343Sngie * modification, are permitted provided that the following conditions 9272343Sngie * are met: 10272343Sngie * 1. Redistributions of source code must retain the above copyright 11272343Sngie * notice, this list of conditions and the following disclaimer. 12272343Sngie * 2. Redistributions in binary form must reproduce the above copyright 13272343Sngie * notice, this list of conditions and the following disclaimer in the 14272343Sngie * documentation and/or other materials provided with the distribution. 15272343Sngie * 16272343Sngie * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17272343Sngie * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18272343Sngie * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19272343Sngie * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20272343Sngie * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21272343Sngie * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22272343Sngie * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23272343Sngie * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24272343Sngie * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25272343Sngie * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26272343Sngie * POSSIBILITY OF SUCH DAMAGE. 27272343Sngie */ 28272343Sngie 29272343Sngie#include <sys/cdefs.h> 30314817Sngie__RCSID("$NetBSD: t_filedesc.c,v 1.6 2017/01/13 21:30:41 christos Exp $"); 31272343Sngie 32272343Sngie#include <sys/types.h> 33272343Sngie 34272343Sngie#include <assert.h> 35272343Sngie#include <atf-c.h> 36272343Sngie#include <fcntl.h> 37272343Sngie#include <stdlib.h> 38272343Sngie#include <pthread.h> 39272343Sngie 40272343Sngie#include <rump/rump.h> 41272343Sngie#include <rump/rump_syscalls.h> 42272343Sngie 43314817Sngie#include "h_macros.h" 44272343Sngie 45272343SngieATF_TC(getfilerace); 46272343SngieATF_TC_HEAD(getfilerace, tc) 47272343Sngie{ 48272343Sngie 49272343Sngie atf_tc_set_md_var(tc, "descr", "race between multithreaded proc. " 50272343Sngie "fd_getfile() and fd_close() (PR kern/43694)"); 51272343Sngie} 52272343Sngie 53272343Sngiestatic int fd; 54272343Sngiestatic volatile bool quit; 55272343Sngie 56272343Sngiestatic void * 57272343Sngiewrkwrk(void *arg) 58272343Sngie{ 59272343Sngie 60272343Sngie /* just something to cause fd_getfile() to be called */ 61272343Sngie while (!quit) 62272343Sngie rump_sys_write(fd, &fd, sizeof(fd)); 63272343Sngie 64272343Sngie return NULL; 65272343Sngie} 66272343Sngie 67272343Sngie/* for me, 1000 triggers extremely seldom, 10k sometimes, 100k almost always */ 68272343Sngie#define DEFAULT_ITERATIONS 10000 69272343Sngie 70272343SngieATF_TC_BODY(getfilerace, tc) 71272343Sngie{ 72272343Sngie pthread_t pt; 73272343Sngie int fd_wrk; 74272343Sngie int i, iters; 75272343Sngie 76272343Sngie /* 77272343Sngie * Want a multiprocessor virtual kernel. A multiprocessor host 78272343Sngie * probably helps too, but that's harder to do in software... 79272343Sngie */ 80272343Sngie setenv("RUMP_NCPU", "2", 1); 81272343Sngie rump_init(); 82272343Sngie 83272343Sngie fd = fd_wrk = rump_sys_open("/dev/null", O_RDWR, 0); 84272343Sngie if (fd == -1) 85272343Sngie atf_tc_fail_errno("cannot open /dev/null"); 86272343Sngie 87272343Sngie if (atf_tc_has_config_var(tc, "iters")) 88272343Sngie iters = atoi(atf_tc_get_config_var(tc, "iters")); 89272343Sngie else 90272343Sngie iters = DEFAULT_ITERATIONS; 91272343Sngie 92272343Sngie pthread_create(&pt, NULL, wrkwrk, NULL); 93272343Sngie for (i = 0; i < iters; i++) { 94272343Sngie rump_sys_close(fd_wrk); 95272343Sngie fd_wrk = rump_sys_open("/dev/null", O_RDWR, 0); 96272343Sngie assert(fd == fd_wrk); 97272343Sngie } 98272343Sngie 99272343Sngie quit = true; 100272343Sngie pthread_join(pt, NULL); 101272343Sngie} 102272343Sngie 103272343SngieATF_TP_ADD_TCS(tp) 104272343Sngie{ 105272343Sngie ATF_TP_ADD_TC(tp, getfilerace); 106272343Sngie 107272343Sngie return atf_no_error(); 108272343Sngie} 109