tools/testing/selftests/futex/functional/futex_wait_private_mapped_file.c

   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 TEST_NAME "futex-wait-private-mapped-file"
  38 #define PAGE_SZ 4096
  39
  40 char pad[PAGE_SZ] = {1};
  41 futex_t val = 1;
  42 char pad2[PAGE_SZ] = {1};
  43
  44 #define WAKE_WAIT_US 3000000
  45 struct timespec wait_timeout = { .tv_sec = 5, .tv_nsec = 0};
  46
  47 void usage(char *prog)
  48 {
  49         printf("Usage: %s\n", prog);
  50         printf("  -c    Use color\n");
  51         printf("  -h    Display this help message\n");
  52         printf("  -v L  Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
  53                VQUIET, VCRITICAL, VINFO);
  54 }
  55
  56 void *thr_futex_wait(void *arg)
  57 {
  58         int ret;
  59
  60         info("futex wait\n");
  61         ret = futex_wait(&val, 1, &wait_timeout, 0);
  62         if (ret && errno != EWOULDBLOCK && errno != ETIMEDOUT) {
  63                 error("futex error.\n", errno);
  64                 print_result(TEST_NAME, RET_ERROR);
  65                 exit(RET_ERROR);
  66         }
  67
  68         if (ret && errno == ETIMEDOUT)
  69                 fail("waiter timedout\n");
  70
  71         info("futex_wait: ret = %d, errno = %d\n", ret, errno);
  72
  73         return NULL;
  74 }
  75
  76 int main(int argc, char **argv)
  77 {
  78         pthread_t thr;
  79         int ret = RET_PASS;
  80         int res;
  81         int c;
  82
  83         while ((c = getopt(argc, argv, "chv:")) != -1) {
  84                 switch (c) {
  85                 case 'c':
  86                         log_color(1);
  87                         break;
  88                 case 'h':
  89                         usage(basename(argv[0]));
  90                         exit(0);
  91                 case 'v':
  92                         log_verbosity(atoi(optarg));
  93                         break;
  94                 default:
  95                         usage(basename(argv[0]));
  96                         exit(1);
  97                 }
  98         }
  99
 100         ksft_print_header();
 101         ksft_print_msg(
 102                 "%s: Test the futex value of private file mappings in FUTEX_WAIT\n",
 103                 basename(argv[0]));
 104
 105         ret = pthread_create(&thr, NULL, thr_futex_wait, NULL);
 106         if (ret < 0) {
 107                 fprintf(stderr, "pthread_create error\n");
 108                 ret = RET_ERROR;
 109                 goto out;
 110         }
 111
 112         info("wait a while\n");
 113         usleep(WAKE_WAIT_US);
 114         val = 2;
 115         res = futex_wake(&val, 1, 0);
 116         info("futex_wake %d\n", res);
 117         if (res != 1) {
 118                 fail("FUTEX_WAKE didn't find the waiting thread.\n");
 119                 ret = RET_FAIL;
 120         }
 121
 122         info("join\n");
 123         pthread_join(thr, NULL);
 124
 125  out:
 126         print_result(TEST_NAME, ret);
 127         return ret;
 128 }