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/*
* Copyright 2019 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "test/time_controller/external_time_controller.h"
#include <atomic>
#include <memory>
#include <utility>
#include "rtc_base/event.h"
#include "rtc_base/task_queue.h"
#include "rtc_base/task_utils/repeating_task.h"
#include "test/gmock.h"
#include "test/gtest.h"
// NOTE: Since these tests rely on real time behavior, they will be flaky
// if run on heavily loaded systems.
namespace webrtc {
namespace {
using ::testing::AtLeast;
using ::testing::Invoke;
using ::testing::MockFunction;
using ::testing::NiceMock;
using ::testing::Return;
constexpr Timestamp kStartTime = Timestamp::Seconds(1000);
class FakeAlarm : public ControlledAlarmClock {
public:
explicit FakeAlarm(Timestamp start_time);
Clock* GetClock() override;
bool ScheduleAlarmAt(Timestamp deadline) override;
void SetCallback(std::function<void()> callback) override;
void Sleep(TimeDelta duration) override;
private:
SimulatedClock clock_;
Timestamp deadline_;
std::function<void()> callback_;
};
FakeAlarm::FakeAlarm(Timestamp start_time)
: clock_(start_time),
deadline_(Timestamp::PlusInfinity()),
callback_([] {}) {}
Clock* FakeAlarm::GetClock() {
return &clock_;
}
bool FakeAlarm::ScheduleAlarmAt(Timestamp deadline) {
if (deadline < deadline_) {
deadline_ = deadline;
return true;
}
return false;
}
void FakeAlarm::SetCallback(std::function<void()> callback) {
callback_ = callback;
}
void FakeAlarm::Sleep(TimeDelta duration) {
Timestamp end_time = clock_.CurrentTime() + duration;
while (deadline_ <= end_time) {
clock_.AdvanceTime(deadline_ - clock_.CurrentTime());
deadline_ = Timestamp::PlusInfinity();
callback_();
}
clock_.AdvanceTime(end_time - clock_.CurrentTime());
}
} // namespace
TEST(ExternalTimeControllerTest, TaskIsStoppedOnStop) {
const TimeDelta kShortInterval = TimeDelta::Millis(5);
const TimeDelta kLongInterval = TimeDelta::Millis(20);
const int kShortIntervalCount = 4;
const int kMargin = 1;
FakeAlarm alarm(kStartTime);
ExternalTimeController time_simulation(&alarm);
rtc::TaskQueue task_queue(
time_simulation.GetTaskQueueFactory()->CreateTaskQueue(
"TestQueue", TaskQueueFactory::Priority::NORMAL));
std::atomic_int counter(0);
auto handle = RepeatingTaskHandle::Start(task_queue.Get(), [&] {
if (++counter >= kShortIntervalCount)
return kLongInterval;
return kShortInterval;
});
// Sleep long enough to go through the initial phase.
time_simulation.AdvanceTime(kShortInterval * (kShortIntervalCount + kMargin));
EXPECT_EQ(counter.load(), kShortIntervalCount);
task_queue.PostTask(
[handle = std::move(handle)]() mutable { handle.Stop(); });
// Sleep long enough that the task would run at least once more if not
// stopped.
time_simulation.AdvanceTime(kLongInterval * 2);
EXPECT_EQ(counter.load(), kShortIntervalCount);
}
TEST(ExternalTimeControllerTest, TaskCanStopItself) {
std::atomic_int counter(0);
FakeAlarm alarm(kStartTime);
ExternalTimeController time_simulation(&alarm);
rtc::TaskQueue task_queue(
time_simulation.GetTaskQueueFactory()->CreateTaskQueue(
"TestQueue", TaskQueueFactory::Priority::NORMAL));
RepeatingTaskHandle handle;
task_queue.PostTask([&] {
handle = RepeatingTaskHandle::Start(task_queue.Get(), [&] {
++counter;
handle.Stop();
return TimeDelta::Millis(2);
});
});
time_simulation.AdvanceTime(TimeDelta::Millis(10));
EXPECT_EQ(counter.load(), 1);
}
TEST(ExternalTimeControllerTest, YieldForTask) {
FakeAlarm alarm(kStartTime);
ExternalTimeController time_simulation(&alarm);
rtc::TaskQueue task_queue(
time_simulation.GetTaskQueueFactory()->CreateTaskQueue(
"TestQueue", TaskQueueFactory::Priority::NORMAL));
rtc::Event event;
task_queue.PostTask([&] { event.Set(); });
EXPECT_TRUE(event.Wait(TimeDelta::Millis(200)));
}
TEST(ExternalTimeControllerTest, TasksYieldToEachOther) {
FakeAlarm alarm(kStartTime);
ExternalTimeController time_simulation(&alarm);
rtc::TaskQueue task_queue(
time_simulation.GetTaskQueueFactory()->CreateTaskQueue(
"TestQueue", TaskQueueFactory::Priority::NORMAL));
rtc::TaskQueue other_queue(
time_simulation.GetTaskQueueFactory()->CreateTaskQueue(
"OtherQueue", TaskQueueFactory::Priority::NORMAL));
task_queue.PostTask([&] {
rtc::Event event;
other_queue.PostTask([&] { event.Set(); });
EXPECT_TRUE(event.Wait(TimeDelta::Millis(200)));
});
time_simulation.AdvanceTime(TimeDelta::Millis(300));
}
TEST(ExternalTimeControllerTest, CurrentTaskQueue) {
FakeAlarm alarm(kStartTime);
ExternalTimeController time_simulation(&alarm);
rtc::TaskQueue task_queue(
time_simulation.GetTaskQueueFactory()->CreateTaskQueue(
"TestQueue", TaskQueueFactory::Priority::NORMAL));
task_queue.PostTask([&] { EXPECT_TRUE(task_queue.IsCurrent()); });
time_simulation.AdvanceTime(TimeDelta::Millis(10));
}
} // namespace webrtc
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