LXR linux/tools/testing/selftests/futex/functional/futex_wait_private_mapped

   1/******************************************************************************
   2 *
   3 * Copyright FUJITSU LIMITED 2010
   4 * Copyright KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
   5 *
   6 *   This program is free software;  you can redistribute it and/or modify
   7 *   it under the terms of the GNU General Public License as published by
   8 *   the Free Software Foundation; either version 2 of the License, or
   9 *   (at your option) any later version.
  10 *
  11 * DESCRIPTION
  12 *      Internally, Futex has two handling mode, anon and file. The private file
  13 *      mapping is special. At first it behave as file, but after write anything
  14 *      it behave as anon. This test is intent to test such case.
  15 *
  16 * AUTHOR
  17 *      KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
  18 *
  19 * HISTORY
  20 *      2010-Jan-6: Initial version by KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
  21 *
  22 *****************************************************************************/
  23
  24#include <stdio.h>
  25#include <stdlib.h>
  26#include <syscall.h>
  27#include <unistd.h>
  28#include <errno.h>
  29#include <linux/futex.h>
  30#include <pthread.h>
  31#include <libgen.h>
  32#include <signal.h>
  33
  34#include "logging.h"
  35#include "futextest.h"
  36
  37#define PAGE_SZ 4096
  38
  39char pad[PAGE_SZ] = {1};
  40futex_t val = 1;
  41char pad2[PAGE_SZ] = {1};
  42
  43#define WAKE_WAIT_US 3000000
  44struct timespec wait_timeout = { .tv_sec = 5, .tv_nsec = 0};
  45
  46void usage(char *prog)
  47{
  48        printf("Usage: %s\n", prog);
  49        printf("  -c    Use color\n");
  50        printf("  -h    Display this help message\n");
  51        printf("  -v L  Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
  52               VQUIET, VCRITICAL, VINFO);
  53}
  54
  55void *thr_futex_wait(void *arg)
  56{
  57        int ret;
  58
  59        info("futex wait\n");
  60        ret = futex_wait(&val, 1, &wait_timeout, 0);
  61        if (ret && errno != EWOULDBLOCK && errno != ETIMEDOUT) {
  62                error("futex error.\n", errno);
  63                print_result(RET_ERROR);
  64                exit(RET_ERROR);
  65        }
  66
  67        if (ret && errno == ETIMEDOUT)
  68                fail("waiter timedout\n");
  69
  70        info("futex_wait: ret = %d, errno = %d\n", ret, errno);
  71
  72        return NULL;
  73}
  74
  75int main(int argc, char **argv)
  76{
  77        pthread_t thr;
  78        int ret = RET_PASS;
  79        int res;
  80        int c;
  81
  82        while ((c = getopt(argc, argv, "chv:")) != -1) {
  83                switch (c) {
  84                case 'c':
  85                        log_color(1);
  86                        break;
  87                case 'h':
  88                        usage(basename(argv[0]));
  89                        exit(0);
  90                case 'v':
  91                        log_verbosity(atoi(optarg));
  92                        break;
  93                default:
  94                        usage(basename(argv[0]));
  95                        exit(1);
  96                }
  97        }
  98
  99        printf("%s: Test the futex value of private file mappings in FUTEX_WAIT\n",
 100               basename(argv[0]));
 101
 102        ret = pthread_create(&thr, NULL, thr_futex_wait, NULL);
 103        if (ret < 0) {
 104                fprintf(stderr, "pthread_create error\n");
 105                ret = RET_ERROR;
 106                goto out;
 107        }
 108
 109        info("wait a while\n");
 110        usleep(WAKE_WAIT_US);
 111        val = 2;
 112        res = futex_wake(&val, 1, 0);
 113        info("futex_wake %d\n", res);
 114        if (res != 1) {
 115                fail("FUTEX_WAKE didn't find the waiting thread.\n");
 116                ret = RET_FAIL;
 117        }
 118
 119        info("join\n");
 120        pthread_join(thr, NULL);
 121
 122 out:
 123        print_result(ret);
 124        return ret;
 125}
 126