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 PAGE_SZ 4096
  38
  39 char pad[PAGE_SZ] = {1};
  40 futex_t val = 1;
  41 char pad2[PAGE_SZ] = {1};
  42
  43 #define WAKE_WAIT_US 3000000
  44 struct timespec wait_timeout = { .tv_sec = 5, .tv_nsec = 0};
  45
  46 void 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
  55 void *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
  75 int 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 }