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message_loop_task_queues_merge_unmerge_unittests.cc
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message_loop_task_queues_merge_unmerge_unittests.cc
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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#define FML_USED_ON_EMBEDDER
#include <thread>
#include <utility>
#include "flutter/fml/message_loop_task_queues.h"
#include "flutter/fml/synchronization/count_down_latch.h"
#include "flutter/fml/synchronization/waitable_event.h"
#include "flutter/fml/time/chrono_timestamp_provider.h"
#include "gtest/gtest.h"
namespace fml {
namespace testing {
class TestWakeable : public fml::Wakeable {
public:
using WakeUpCall = std::function<void(const fml::TimePoint)>;
explicit TestWakeable(WakeUpCall call) : wake_up_call_(std::move(call)) {}
void WakeUp(fml::TimePoint time_point) override { wake_up_call_(time_point); }
private:
WakeUpCall wake_up_call_;
};
static int CountRemainingTasks(fml::MessageLoopTaskQueues* task_queue,
const TaskQueueId& queue_id,
bool run_invocation = false) {
const auto now = ChronoTicksSinceEpoch();
int count = 0;
fml::closure invocation;
do {
invocation = task_queue->GetNextTaskToRun(queue_id, now);
if (!invocation) {
break;
}
count++;
if (run_invocation) {
invocation();
}
} while (invocation);
return count;
}
TEST(MessageLoopTaskQueueMergeUnmerge,
AfterMergePrimaryTasksServicedOnPrimary) {
auto task_queue = fml::MessageLoopTaskQueues::GetInstance();
auto queue_id_1 = task_queue->CreateTaskQueue();
auto queue_id_2 = task_queue->CreateTaskQueue();
task_queue->RegisterTask(
queue_id_1, []() {}, ChronoTicksSinceEpoch());
ASSERT_EQ(1u, task_queue->GetNumPendingTasks(queue_id_1));
task_queue->Merge(queue_id_1, queue_id_2);
task_queue->RegisterTask(
queue_id_1, []() {}, ChronoTicksSinceEpoch());
ASSERT_EQ(2u, task_queue->GetNumPendingTasks(queue_id_1));
ASSERT_EQ(0u, task_queue->GetNumPendingTasks(queue_id_2));
}
TEST(MessageLoopTaskQueueMergeUnmerge,
AfterMergeSecondaryTasksAlsoServicedOnPrimary) {
auto task_queue = fml::MessageLoopTaskQueues::GetInstance();
auto queue_id_1 = task_queue->CreateTaskQueue();
auto queue_id_2 = task_queue->CreateTaskQueue();
task_queue->RegisterTask(
queue_id_2, []() {}, ChronoTicksSinceEpoch());
ASSERT_EQ(1u, task_queue->GetNumPendingTasks(queue_id_2));
task_queue->Merge(queue_id_1, queue_id_2);
ASSERT_EQ(1u, task_queue->GetNumPendingTasks(queue_id_1));
ASSERT_EQ(0u, task_queue->GetNumPendingTasks(queue_id_2));
}
TEST(MessageLoopTaskQueueMergeUnmerge, MergeUnmergeTasksPreserved) {
auto task_queue = fml::MessageLoopTaskQueues::GetInstance();
auto queue_id_1 = task_queue->CreateTaskQueue();
auto queue_id_2 = task_queue->CreateTaskQueue();
task_queue->RegisterTask(
queue_id_1, []() {}, ChronoTicksSinceEpoch());
task_queue->RegisterTask(
queue_id_2, []() {}, ChronoTicksSinceEpoch());
ASSERT_EQ(1u, task_queue->GetNumPendingTasks(queue_id_1));
ASSERT_EQ(1u, task_queue->GetNumPendingTasks(queue_id_2));
task_queue->Merge(queue_id_1, queue_id_2);
ASSERT_EQ(2u, task_queue->GetNumPendingTasks(queue_id_1));
ASSERT_EQ(0u, task_queue->GetNumPendingTasks(queue_id_2));
task_queue->Unmerge(queue_id_1, queue_id_2);
ASSERT_EQ(1u, task_queue->GetNumPendingTasks(queue_id_1));
ASSERT_EQ(1u, task_queue->GetNumPendingTasks(queue_id_2));
}
/// Multiple standalone engines scene
TEST(MessageLoopTaskQueueMergeUnmerge,
OneCanOwnMultipleQueuesAndUnmergeIndependently) {
auto task_queue = fml::MessageLoopTaskQueues::GetInstance();
auto queue_id_1 = task_queue->CreateTaskQueue();
auto queue_id_2 = task_queue->CreateTaskQueue();
auto queue_id_3 = task_queue->CreateTaskQueue();
// merge
ASSERT_TRUE(task_queue->Merge(queue_id_1, queue_id_2));
ASSERT_TRUE(task_queue->Owns(queue_id_1, queue_id_2));
ASSERT_FALSE(task_queue->Owns(queue_id_1, queue_id_3));
ASSERT_TRUE(task_queue->Merge(queue_id_1, queue_id_3));
ASSERT_TRUE(task_queue->Owns(queue_id_1, queue_id_2));
ASSERT_TRUE(task_queue->Owns(queue_id_1, queue_id_3));
// unmerge
ASSERT_TRUE(task_queue->Unmerge(queue_id_1, queue_id_2));
ASSERT_FALSE(task_queue->Owns(queue_id_1, queue_id_2));
ASSERT_TRUE(task_queue->Owns(queue_id_1, queue_id_3));
ASSERT_TRUE(task_queue->Unmerge(queue_id_1, queue_id_3));
ASSERT_FALSE(task_queue->Owns(queue_id_1, queue_id_2));
ASSERT_FALSE(task_queue->Owns(queue_id_1, queue_id_3));
}
TEST(MessageLoopTaskQueueMergeUnmerge,
CannotMergeSameQueueToTwoDifferentOwners) {
auto task_queue = fml::MessageLoopTaskQueues::GetInstance();
auto queue = task_queue->CreateTaskQueue();
auto owner_1 = task_queue->CreateTaskQueue();
auto owner_2 = task_queue->CreateTaskQueue();
ASSERT_TRUE(task_queue->Merge(owner_1, queue));
ASSERT_FALSE(task_queue->Merge(owner_2, queue));
}
TEST(MessageLoopTaskQueueMergeUnmerge, MergeFailIfAlreadySubsumed) {
auto task_queue = fml::MessageLoopTaskQueues::GetInstance();
auto queue_id_1 = task_queue->CreateTaskQueue();
auto queue_id_2 = task_queue->CreateTaskQueue();
auto queue_id_3 = task_queue->CreateTaskQueue();
ASSERT_TRUE(task_queue->Merge(queue_id_1, queue_id_2));
ASSERT_FALSE(task_queue->Merge(queue_id_2, queue_id_3));
ASSERT_FALSE(task_queue->Merge(queue_id_2, queue_id_1));
}
TEST(MessageLoopTaskQueueMergeUnmerge,
MergeFailIfAlreadyOwnsButTryToBeSubsumed) {
auto task_queue = fml::MessageLoopTaskQueues::GetInstance();
auto queue_id_1 = task_queue->CreateTaskQueue();
auto queue_id_2 = task_queue->CreateTaskQueue();
auto queue_id_3 = task_queue->CreateTaskQueue();
task_queue->Merge(queue_id_1, queue_id_2);
// A recursively linked merging will fail
ASSERT_FALSE(task_queue->Merge(queue_id_3, queue_id_1));
}
TEST(MessageLoopTaskQueueMergeUnmerge, UnmergeFailsOnSubsumedOrNeverMerged) {
auto task_queue = fml::MessageLoopTaskQueues::GetInstance();
auto queue_id_1 = task_queue->CreateTaskQueue();
auto queue_id_2 = task_queue->CreateTaskQueue();
auto queue_id_3 = task_queue->CreateTaskQueue();
task_queue->Merge(queue_id_1, queue_id_2);
ASSERT_FALSE(task_queue->Unmerge(queue_id_2, queue_id_3));
ASSERT_FALSE(task_queue->Unmerge(queue_id_1, queue_id_3));
ASSERT_FALSE(task_queue->Unmerge(queue_id_3, queue_id_1));
ASSERT_FALSE(task_queue->Unmerge(queue_id_2, queue_id_1));
}
TEST(MessageLoopTaskQueueMergeUnmerge, MergeInvokesBothWakeables) {
auto task_queue = fml::MessageLoopTaskQueues::GetInstance();
auto queue_id_1 = task_queue->CreateTaskQueue();
auto queue_id_2 = task_queue->CreateTaskQueue();
fml::CountDownLatch latch(2);
auto wakeable1 = std::make_unique<TestWakeable>(
[&](fml::TimePoint wake_time) { latch.CountDown(); });
auto wakeable2 = std::make_unique<TestWakeable>(
[&](fml::TimePoint wake_time) { latch.CountDown(); });
task_queue->SetWakeable(queue_id_1, wakeable1.get());
task_queue->SetWakeable(queue_id_2, wakeable2.get());
task_queue->RegisterTask(
queue_id_1, []() {}, ChronoTicksSinceEpoch());
task_queue->Merge(queue_id_1, queue_id_2);
CountRemainingTasks(task_queue, queue_id_1);
latch.Wait();
}
TEST(MessageLoopTaskQueueMergeUnmerge,
MergeUnmergeInvokesBothWakeablesSeparately) {
auto task_queue = fml::MessageLoopTaskQueues::GetInstance();
auto queue_id_1 = task_queue->CreateTaskQueue();
auto queue_id_2 = task_queue->CreateTaskQueue();
fml::AutoResetWaitableEvent latch_1, latch_2;
auto wakeable1 = std::make_unique<TestWakeable>(
[&](fml::TimePoint wake_time) { latch_1.Signal(); });
auto wakeable2 = std::make_unique<TestWakeable>(
[&](fml::TimePoint wake_time) { latch_2.Signal(); });
task_queue->SetWakeable(queue_id_1, wakeable1.get());
task_queue->SetWakeable(queue_id_2, wakeable2.get());
task_queue->RegisterTask(
queue_id_1, []() {}, ChronoTicksSinceEpoch());
task_queue->RegisterTask(
queue_id_2, []() {}, ChronoTicksSinceEpoch());
task_queue->Merge(queue_id_1, queue_id_2);
task_queue->Unmerge(queue_id_1, queue_id_2);
CountRemainingTasks(task_queue, queue_id_1);
latch_1.Wait();
CountRemainingTasks(task_queue, queue_id_2);
latch_2.Wait();
}
TEST(MessageLoopTaskQueueMergeUnmerge, GetTasksToRunNowBlocksMerge) {
auto task_queue = fml::MessageLoopTaskQueues::GetInstance();
auto queue_id_1 = task_queue->CreateTaskQueue();
auto queue_id_2 = task_queue->CreateTaskQueue();
fml::AutoResetWaitableEvent wake_up_start, wake_up_end, merge_start,
merge_end;
auto wakeable = std::make_unique<TestWakeable>([&](fml::TimePoint wake_time) {
wake_up_start.Signal();
wake_up_end.Wait();
});
task_queue->RegisterTask(
queue_id_1, []() {}, ChronoTicksSinceEpoch());
task_queue->SetWakeable(queue_id_1, wakeable.get());
std::thread tasks_to_run_now_thread(
[&]() { CountRemainingTasks(task_queue, queue_id_1); });
wake_up_start.Wait();
bool merge_done = false;
std::thread merge_thread([&]() {
merge_start.Signal();
task_queue->Merge(queue_id_1, queue_id_2);
merge_done = true;
merge_end.Signal();
});
merge_start.Wait();
ASSERT_FALSE(merge_done);
wake_up_end.Signal();
merge_end.Wait();
ASSERT_TRUE(merge_done);
tasks_to_run_now_thread.join();
merge_thread.join();
}
TEST(MessageLoopTaskQueueMergeUnmerge,
FollowingTasksSwitchQueueIfFirstTaskMergesThreads) {
auto task_queue = fml::MessageLoopTaskQueues::GetInstance();
auto queue_id_1 = task_queue->CreateTaskQueue();
auto queue_id_2 = task_queue->CreateTaskQueue();
fml::CountDownLatch latch(2);
auto wakeable1 = std::make_unique<TestWakeable>(
[&](fml::TimePoint wake_time) { latch.CountDown(); });
auto wakeable2 = std::make_unique<TestWakeable>(
[&](fml::TimePoint wake_time) { latch.CountDown(); });
task_queue->SetWakeable(queue_id_1, wakeable1.get());
task_queue->SetWakeable(queue_id_2, wakeable2.get());
task_queue->RegisterTask(
queue_id_2, [&]() { task_queue->Merge(queue_id_1, queue_id_2); },
ChronoTicksSinceEpoch());
task_queue->RegisterTask(
queue_id_2, []() {}, ChronoTicksSinceEpoch());
ASSERT_EQ(CountRemainingTasks(task_queue, queue_id_2, true), 1);
ASSERT_EQ(CountRemainingTasks(task_queue, queue_id_1, true), 1);
latch.Wait();
}
} // namespace testing
} // namespace fml