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76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
/*
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* Copyright (c) 2021, Brian Gianforcaro <bgianf@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Atomic.h>
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#include <AK/Time.h>
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#include <LibCore/ElapsedTimer.h>
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#include <LibTest/TestCase.h>
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#include <signal.h>
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#include <signal_numbers.h>
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#include <unistd.h>
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class SuccessContext {
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public:
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static Atomic<bool> alarm_fired;
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static Core::ElapsedTimer signal_timer;
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static constexpr auto timer_value = Time::from_seconds(1);
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static void test_signal_handler(int signal)
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{
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auto actual_duration = Time::from_milliseconds(SuccessContext::signal_timer.elapsed());
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auto expected_duration = SuccessContext::timer_value;
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// Add a small buffer to allow for latency on the system.
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constexpr auto buffer_duration = Time::from_milliseconds(50);
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dbgln("Signal Times - Actual: {} Expected: {}", actual_duration.to_milliseconds(), expected_duration.to_milliseconds());
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EXPECT(actual_duration >= expected_duration);
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EXPECT(actual_duration < expected_duration + buffer_duration);
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EXPECT_EQ(signal, SIGALRM);
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SuccessContext::alarm_fired = true;
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}
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};
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Atomic<bool> SuccessContext::alarm_fired { false };
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Core::ElapsedTimer SuccessContext::signal_timer {};
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TEST_CASE(success_case)
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{
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signal(SIGALRM, SuccessContext::test_signal_handler);
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SuccessContext::signal_timer.start();
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auto previous_time = alarm(SuccessContext::timer_value.to_seconds());
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EXPECT_EQ(previous_time, 0u);
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auto sleep_time = SuccessContext::timer_value + Time::from_seconds(1);
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sleep(sleep_time.to_seconds());
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EXPECT(SuccessContext::alarm_fired);
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}
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// Regression test for issues #9071
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// See: https://github.com/SerenityOS/serenity/issues/9071
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TEST_CASE(regression_inifinite_loop)
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{
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constexpr auto hour_long_timer_value = Time::from_seconds(60 * 60);
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// Create an alarm timer significantly far into the future.
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auto previous_time = alarm(hour_long_timer_value.to_seconds());
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EXPECT_EQ(previous_time, 0u);
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// Update the alarm with a zero value before the previous timer expires.
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previous_time = alarm(0);
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EXPECT_EQ(previous_time, hour_long_timer_value.to_seconds());
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// Update the alarm with a zero value again, this shouldn't get stuck
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// in an infinite loop trying to cancel the previous timer in the kernel.
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previous_time = alarm(0);
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EXPECT_EQ(previous_time, 0u);
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}
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