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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];
f1 = &_f1;
/*
* Requeue a waiter from f1 to f2, and wake f2.
*/
ASSERT_EQ(0, pthread_create(&waiter[0], NULL, waiterfn, NULL));
usleep(WAKE_WAIT_US);
EXPECT_EQ(1, futex_cmp_requeue(f1, 0, &f2, 0, 1, 0));
EXPECT_EQ(1, futex_wake(&f2, 1, 0));
}
TEST(requeue_multiple)
{
volatile futex_t _f1 = 0;
volatile futex_t f2 = 0;
pthread_t waiter[10];
int 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++)
ASSERT_EQ(0, pthread_create(&waiter[i], NULL, waiterfn, NULL));
usleep(WAKE_WAIT_US);
EXPECT_EQ(10, futex_cmp_requeue(f1, 0, &f2, 3, 7, 0));
EXPECT_EQ(7, futex_wake(&f2, INT_MAX, 0));
}
TEST_HARNESS_MAIN
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