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 }
126