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
39char pad[PAGE_SZ] = {1};
40futex_t val = 1;
41char pad2[PAGE_SZ] = {1};
42
43#define WAKE_WAIT_US 3000000
44struct timespec wait_timeout = { .tv_sec = 5, .tv_nsec = 0};
45
46void 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
55void *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
75int 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}
126