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

   1/******************************************************************************
   2 *
   3 *   Copyright © International Business Machines  Corp., 2009
   4 *
   5 *   This program is free software;  you can redistribute it and/or modify
   6 *   it under the terms of the GNU General Public License as published by
   7 *   the Free Software Foundation; either version 2 of the License, or
   8 *   (at your option) any later version.
   9 *
  10 * DESCRIPTION
  11 *      Block on a futex and wait for timeout.
  12 *
  13 * AUTHOR
  14 *      Darren Hart <dvhart@linux.intel.com>
  15 *
  16 * HISTORY
  17 *      2009-Nov-6: Initial version by Darren Hart <dvhart@linux.intel.com>
  18 *
  19 *****************************************************************************/
  20
  21#include <errno.h>
  22#include <getopt.h>
  23#include <stdio.h>
  24#include <stdlib.h>
  25#include <string.h>
  26#include <time.h>
  27#include "futextest.h"
  28#include "logging.h"
  29
  30static long timeout_ns = 100000;        /* 100us default timeout */
  31
  32void usage(char *prog)
  33{
  34        printf("Usage: %s\n", prog);
  35        printf("  -c    Use color\n");
  36        printf("  -h    Display this help message\n");
  37        printf("  -t N  Timeout in nanoseconds (default: 100,000)\n");
  38        printf("  -v L  Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
  39               VQUIET, VCRITICAL, VINFO);
  40}
  41
  42int main(int argc, char *argv[])
  43{
  44        futex_t f1 = FUTEX_INITIALIZER;
  45        struct timespec to;
  46        int res, ret = RET_PASS;
  47        int c;
  48
  49        while ((c = getopt(argc, argv, "cht:v:")) != -1) {
  50                switch (c) {
  51                case 'c':
  52                        log_color(1);
  53                        break;
  54                case 'h':
  55                        usage(basename(argv[0]));
  56                        exit(0);
  57                case 't':
  58                        timeout_ns = atoi(optarg);
  59                        break;
  60                case 'v':
  61                        log_verbosity(atoi(optarg));
  62                        break;
  63                default:
  64                        usage(basename(argv[0]));
  65                        exit(1);
  66                }
  67        }
  68
  69        printf("%s: Block on a futex and wait for timeout\n",
  70               basename(argv[0]));
  71        printf("\tArguments: timeout=%ldns\n", timeout_ns);
  72
  73        /* initialize timeout */
  74        to.tv_sec = 0;
  75        to.tv_nsec = timeout_ns;
  76
  77        info("Calling futex_wait on f1: %u @ %p\n", f1, &f1);
  78        res = futex_wait(&f1, f1, &to, FUTEX_PRIVATE_FLAG);
  79        if (!res || errno != ETIMEDOUT) {
  80                fail("futex_wait returned %d\n", ret < 0 ? errno : ret);
  81                ret = RET_FAIL;
  82        }
  83
  84        print_result(ret);
  85        return ret;
  86}
  87