futex_wait_private_mapped_file.c

 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 "futextest.h"
31#include "kselftest_harness.h"
32
33#define PAGE_SZ 4096
34
35char pad[PAGE_SZ] = {1};
36futex_t val = 1;
37char pad2[PAGE_SZ] = {1};
38
39#define WAKE_WAIT_US 3000000
40struct timespec wait_timeout = { .tv_sec = 5, .tv_nsec = 0};
41
42void *thr_futex_wait(void *arg)
43{
44	int ret;
45
46	ksft_print_dbg_msg("futex wait\n");
47	ret = futex_wait(&val, 1, &wait_timeout, 0);
48	if (ret && errno != EWOULDBLOCK && errno != ETIMEDOUT)
49		ksft_exit_fail_msg("futex error.\n");
50
51	if (ret && errno == ETIMEDOUT)
52		ksft_exit_fail_msg("waiter timedout\n");
53
54	ksft_print_dbg_msg("futex_wait: ret = %d, errno = %d\n", ret, errno);
55
56	return NULL;
57}
58
59TEST(wait_private_mapped_file)
60{
61	pthread_t thr;
62	int res;
63
64	res = pthread_create(&thr, NULL, thr_futex_wait, NULL);
65	if (res < 0)
66		ksft_exit_fail_msg("pthread_create error\n");
67
68	ksft_print_dbg_msg("wait a while\n");
69	usleep(WAKE_WAIT_US);
70	val = 2;
71	res = futex_wake(&val, 1, 0);
72	ksft_print_dbg_msg("futex_wake %d\n", res);
73	if (res != 1)
74		ksft_exit_fail_msg("FUTEX_WAKE didn't find the waiting thread.\n");
75
76	ksft_print_dbg_msg("join\n");
77	pthread_join(thr, NULL);
78
79	ksft_test_result_pass("wait_private_mapped_file");
80}
81
82TEST_HARNESS_MAIN