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

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/******************************************************************************
   3 *
   4 * Copyright FUJITSU LIMITED 2010
   5 * Copyright KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
   6 *
   7 * DESCRIPTION
   8 *      Internally, Futex has two handling mode, anon and file. The private file
   9 *      mapping is special. At first it behave as file, but after write anything
  10 *      it behave as anon. This test is intent to test such case.
  11 *
  12 * AUTHOR
  13 *      KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
  14 *
  15 * HISTORY
  16 *      2010-Jan-6: Initial version by KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
  17 *
  18 *****************************************************************************/
  19
  20#include <stdio.h>
  21#include <stdlib.h>
  22#include <syscall.h>
  23#include <unistd.h>
  24#include <errno.h>
  25#include <linux/futex.h>
  26#include <pthread.h>
  27#include <libgen.h>
  28#include <signal.h>
  29
  30#include "logging.h"
  31#include "futextest.h"
  32
  33#define TEST_NAME "futex-wait-private-mapped-file"
  34#define PAGE_SZ 4096
  35
  36char pad[PAGE_SZ] = {1};
  37futex_t val = 1;
  38char pad2[PAGE_SZ] = {1};
  39
  40#define WAKE_WAIT_US 3000000
  41struct timespec wait_timeout = { .tv_sec = 5, .tv_nsec = 0};
  42
  43void usage(char *prog)
  44{
  45        printf("Usage: %s\n", prog);
  46        printf("  -c    Use color\n");
  47        printf("  -h    Display this help message\n");
  48        printf("  -v L  Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
  49               VQUIET, VCRITICAL, VINFO);
  50}
  51
  52void *thr_futex_wait(void *arg)
  53{
  54        int ret;
  55
  56        info("futex wait\n");
  57        ret = futex_wait(&val, 1, &wait_timeout, 0);
  58        if (ret && errno != EWOULDBLOCK && errno != ETIMEDOUT) {
  59                error("futex error.\n", errno);
  60                print_result(TEST_NAME, RET_ERROR);
  61                exit(RET_ERROR);
  62        }
  63
  64        if (ret && errno == ETIMEDOUT)
  65                fail("waiter timedout\n");
  66
  67        info("futex_wait: ret = %d, errno = %d\n", ret, errno);
  68
  69        return NULL;
  70}
  71
  72int main(int argc, char **argv)
  73{
  74        pthread_t thr;
  75        int ret = RET_PASS;
  76        int res;
  77        int c;
  78
  79        while ((c = getopt(argc, argv, "chv:")) != -1) {
  80                switch (c) {
  81                case 'c':
  82                        log_color(1);
  83                        break;
  84                case 'h':
  85                        usage(basename(argv[0]));
  86                        exit(0);
  87                case 'v':
  88                        log_verbosity(atoi(optarg));
  89                        break;
  90                default:
  91                        usage(basename(argv[0]));
  92                        exit(1);
  93                }
  94        }
  95
  96        ksft_print_header();
  97        ksft_set_plan(1);
  98        ksft_print_msg(
  99                "%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(TEST_NAME, ret);
 124        return ret;
 125}
 126