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// Copyright 2022 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "dawn/native/AsyncTask.h"
#include <utility>
#include "dawn/platform/DawnPlatform.h"
namespace dawn::native {
AsyncTaskManager::AsyncTaskManager(dawn::platform::WorkerTaskPool* workerTaskPool)
: mWorkerTaskPool(workerTaskPool) {}
void AsyncTaskManager::PostTask(AsyncTask asyncTask) {
// If these allocations becomes expensive, we can slab-allocate tasks.
Ref<WaitableTask> waitableTask = AcquireRef(new WaitableTask());
waitableTask->taskManager = this;
waitableTask->asyncTask = std::move(asyncTask);
{
// We insert new waitableTask objects into mPendingTasks in main thread (PostTask()),
// and we may remove waitableTask objects from mPendingTasks in either main thread
// (WaitAllPendingTasks()) or sub-thread (TaskCompleted), so mPendingTasks should be
// protected by a mutex.
std::lock_guard<std::mutex> lock(mPendingTasksMutex);
mPendingTasks.emplace(waitableTask.Get(), waitableTask);
}
// Ref the task since it is accessed inside the worker function.
// The worker function will acquire and release the task upon completion.
waitableTask->Reference();
waitableTask->waitableEvent =
mWorkerTaskPool->PostWorkerTask(DoWaitableTask, waitableTask.Get());
}
void AsyncTaskManager::HandleTaskCompletion(WaitableTask* task) {
std::lock_guard<std::mutex> lock(mPendingTasksMutex);
auto iter = mPendingTasks.find(task);
if (iter != mPendingTasks.end()) {
mPendingTasks.erase(iter);
}
}
void AsyncTaskManager::WaitAllPendingTasks() {
std::unordered_map<WaitableTask*, Ref<WaitableTask>> allPendingTasks;
{
std::lock_guard<std::mutex> lock(mPendingTasksMutex);
allPendingTasks.swap(mPendingTasks);
}
for (auto& [_, task] : allPendingTasks) {
task->waitableEvent->Wait();
}
}
bool AsyncTaskManager::HasPendingTasks() {
std::lock_guard<std::mutex> lock(mPendingTasksMutex);
return !mPendingTasks.empty();
}
void AsyncTaskManager::DoWaitableTask(void* task) {
Ref<WaitableTask> waitableTask = AcquireRef(static_cast<WaitableTask*>(task));
waitableTask->asyncTask();
waitableTask->taskManager->HandleTaskCompletion(waitableTask.Get());
}
AsyncTaskManager::WaitableTask::WaitableTask() = default;
AsyncTaskManager::WaitableTask::~WaitableTask() = default;
} // namespace dawn::native