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Tests: Add coverage for sys$alarm() canceling a stale timer

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This is a regression test to validate the functionality that was
reported broken in #9071, where the kernel would spin attempting
to cancel a stale timer.
This commit is contained in:
Brian Gianforcaro 2021-07-31 16:38:14 -07:00 committed by Andreas Kling
parent fc91eb365d
commit ea401fb3c3
Notes: sideshowbarker 2024-07-18 07:32:22 +09:00 
Author: https://github.com/bgianfo
Commit: https://github.com/SerenityOS/serenity/commit/ea401fb3c33
Pull-request: https://github.com/SerenityOS/serenity/pull/9145
Reviewed-by: https://github.com/tomuta ✅
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Tests/Kernel/TestKernelAlarm.cpp Normal file
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/*
* Copyright (c) 2021, Brian Gianforcaro <bgianf@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Time.h>
#include <LibTest/TestCase.h>
#include <unistd.h>
// Regression test for issues #9071
// See: https://github.com/SerenityOS/serenity/issues/9071
TEST_CASE(regression_inifinite_loop)
{
constexpr auto hour_long_timer_value = Time::from_seconds(60 * 60);
// Create an alarm timer significantly far into the future.
auto previous_time = alarm(hour_long_timer_value.to_seconds());
EXPECT_EQ(previous_time, 0u);
// Update the alarm with a zero value before the previous timer expires.
previous_time = alarm(0);
EXPECT_EQ(previous_time, hour_long_timer_value.to_seconds());
// Update the alarm with a zero value again, this shouldn't get stuck
// in an infinite loop trying to cancel the previous timer in the kernel.
previous_time = alarm(0);
EXPECT_EQ(previous_time, 0u);
}