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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright Collabora Ltd., 2021
*
* futex cmp requeue test by André Almeida <andrealmeid@collabora.com>
*/
#include <pthread.h>
#include <limits.h>
#include "futextest.h"
#include "../../kselftest_harness.h"
#define timeout_ns 30000000
#define WAKE_WAIT_US 10000
volatile futex_t *f1;
void *waiterfn(void *arg)
{
struct timespec to;
to.tv_sec = 0;
to.tv_nsec = timeout_ns;
if (futex_wait(f1, *f1, &to, 0))
printf("waiter failed errno %d\n", errno);
return NULL;
}
TEST(requeue_single)
{
volatile futex_t _f1 = 0;
volatile futex_t f2 = 0;
pthread_t waiter[10];
int res;
f1 = &_f1;
/*
* Requeue a waiter from f1 to f2, and wake f2.
*/
if (pthread_create(&waiter[0], NULL, waiterfn, NULL))
ksft_exit_fail_msg("pthread_create failed\n");
usleep(WAKE_WAIT_US);
ksft_print_dbg_msg("Requeuing 1 futex from f1 to f2\n");
res = futex_cmp_requeue(f1, 0, &f2, 0, 1, 0);
if (res != 1)
ksft_test_result_fail("futex_requeue simple returned: %d %s\n",
res ? errno : res,
res ? strerror(errno) : "");
ksft_print_dbg_msg("Waking 1 futex at f2\n");
res = futex_wake(&f2, 1, 0);
if (res != 1) {
ksft_test_result_fail("futex_requeue simple returned: %d %s\n",
res ? errno : res,
res ? strerror(errno) : "");
} else {
ksft_test_result_pass("futex_requeue simple succeeds\n");
}
}
TEST(requeue_multiple)
{
volatile futex_t _f1 = 0;
volatile futex_t f2 = 0;
pthread_t waiter[10];
int res, i;
f1 = &_f1;
/*
* Create 10 waiters at f1. At futex_requeue, wake 3 and requeue 7.
* At futex_wake, wake INT_MAX (should be exactly 7).
*/
for (i = 0; i < 10; i++) {
if (pthread_create(&waiter[i], NULL, waiterfn, NULL))
ksft_exit_fail_msg("pthread_create failed\n");
}
usleep(WAKE_WAIT_US);
ksft_print_dbg_msg("Waking 3 futexes at f1 and requeuing 7 futexes from f1 to f2\n");
res = futex_cmp_requeue(f1, 0, &f2, 3, 7, 0);
if (res != 10) {
ksft_test_result_fail("futex_requeue many returned: %d %s\n",
res ? errno : res,
res ? strerror(errno) : "");
}
ksft_print_dbg_msg("Waking INT_MAX futexes at f2\n");
res = futex_wake(&f2, INT_MAX, 0);
if (res != 7) {
ksft_test_result_fail("futex_requeue many returned: %d %s\n",
res ? errno : res,
res ? strerror(errno) : "");
} else {
ksft_test_result_pass("futex_requeue many succeeds\n");
}
}
TEST_HARNESS_MAIN
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