tests/kernel/t_filedesc.c

   1 /*      $NetBSD: t_filedesc.c,v 1.5 2012/03/18 09:46:50 jruoho 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 1.5 2012/03/18 09:46:50 jruoho 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
  45 ATF_TC(getfilerace);
  46 ATF_TC_HEAD(getfilerace, tc)
  47 {
  48
  49         atf_tc_set_md_var(tc, "descr", "race between multithreaded proc. "
  50             "fd_getfile() and fd_close() (PR kern/43694)");
  51 }
  52
  53 static int fd;
  54 static volatile bool quit;
  55
  56 static void *
  57 wrkwrk(void *arg)
  58 {
  59
  60         /* just something to cause fd_getfile() to be called */
  61         while (!quit)
  62                 rump_sys_write(fd, &fd, sizeof(fd));
  63
  64         return NULL;
  65 }
  66
  67 /* for me, 1000 triggers extremely seldom, 10k sometimes, 100k almost always */
  68 #define DEFAULT_ITERATIONS 10000
  69
  70 ATF_TC_BODY(getfilerace, tc)
  71 {
  72         pthread_t pt;
  73         int fd_wrk;
  74         int i, iters;
  75
  76         /*
  77          * Want a multiprocessor virtual kernel.  A multiprocessor host
  78          * probably helps too, but that's harder to do in software...
  79          */
  80         setenv("RUMP_NCPU", "2", 1);
  81         rump_init();
  82
  83         fd = fd_wrk = rump_sys_open("/dev/null", O_RDWR, 0);
  84         if (fd == -1)
  85                 atf_tc_fail_errno("cannot open /dev/null");
  86
  87         if (atf_tc_has_config_var(tc, "iters"))
  88                 iters = atoi(atf_tc_get_config_var(tc, "iters"));
  89         else
  90                 iters = DEFAULT_ITERATIONS;
  91
  92         pthread_create(&pt, NULL, wrkwrk, NULL);
  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
 103 ATF_TP_ADD_TCS(tp)
 104 {
 105         ATF_TP_ADD_TC(tp, getfilerace);
 106
 107         return atf_no_error();
 108 }