futex_wait_wouldblock.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/******************************************************************************
 3 *
 4 *   Copyright © International Business Machines  Corp., 2009
 5 *
 6 * DESCRIPTION
 7 *      Test if FUTEX_WAIT op returns -EWOULDBLOCK if the futex value differs
 8 *      from the expected one.
 9 *
10 * AUTHOR
11 *      Gowrishankar <gowrishankar.m@in.ibm.com>
12 *
13 * HISTORY
14 *      2009-Nov-14: Initial version by Gowrishankar <gowrishankar.m@in.ibm.com>
15 *
16 *****************************************************************************/
17
18#include <errno.h>
19#include <getopt.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <time.h>
24
25#include "futextest.h"
26#include "futex2test.h"
27#include "kselftest_harness.h"
28
29#define timeout_ns 100000
30
31TEST(futex_wait_wouldblock)
32{
33	struct timespec to = {.tv_sec = 0, .tv_nsec = timeout_ns};
34	futex_t f1 = FUTEX_INITIALIZER;
35	int res;
36
37	ksft_print_dbg_msg("Calling futex_wait on f1: %u @ %p with val=%u\n", f1, &f1, f1+1);
38	res = futex_wait(&f1, f1+1, &to, FUTEX_PRIVATE_FLAG);
39	if (!res || errno != EWOULDBLOCK) {
40		ksft_test_result_fail("futex_wait returned: %d %s\n",
41				      res ? errno : res,
42				      res ? strerror(errno) : "");
43	} else {
44		ksft_test_result_pass("futex_wait\n");
45	}
46}
47
48TEST(futex_waitv_wouldblock)
49{
50	struct timespec to = {.tv_sec = 0, .tv_nsec = timeout_ns};
51	futex_t f1 = FUTEX_INITIALIZER;
52	struct futex_waitv waitv = {
53		.uaddr		= (uintptr_t)&f1,
54		.val		= f1 + 1,
55		.flags		= FUTEX_32,
56		.__reserved	= 0,
57	};
58	int res;
59
60	if (clock_gettime(CLOCK_MONOTONIC, &to))
61		ksft_exit_fail_msg("clock_gettime failed %d\n", errno);
62
63	to.tv_nsec += timeout_ns;
64
65	if (to.tv_nsec >= 1000000000) {
66		to.tv_sec++;
67		to.tv_nsec -= 1000000000;
68	}
69
70	ksft_print_dbg_msg("Calling futex_waitv on f1: %u @ %p with val=%u\n", f1, &f1, f1+1);
71	res = futex_waitv(&waitv, 1, 0, &to, CLOCK_MONOTONIC);
72	if (!res || errno != EWOULDBLOCK) {
73		ksft_test_result_fail("futex_waitv returned: %d %s\n",
74				      res ? errno : res,
75				      res ? strerror(errno) : "");
76	} else {
77		ksft_test_result_pass("futex_waitv\n");
78	}
79}
80
81TEST_HARNESS_MAIN