tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
40char pad[PAGE_SZ] = {1};
41futex_t val = 1;
42char pad2[PAGE_SZ] = {1};
43
44#define WAKE_WAIT_US 3000000
45struct timespec wait_timeout = { .tv_sec = 5, .tv_nsec = 0};
46
47void 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
56void *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
76int 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}