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// Copyright 2021 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.
#ifndef SRC_DAWN_NATIVE_CALLBACKTASKMANAGER_H_
#define SRC_DAWN_NATIVE_CALLBACKTASKMANAGER_H_
#include <functional>
#include <memory>
#include <mutex>
#include <vector>
#include "dawn/common/RefCounted.h"
#include "dawn/common/TypeTraits.h"
namespace dawn::native {
struct CallbackTask {
public:
virtual ~CallbackTask() = default;
void Execute();
void OnShutDown();
void OnDeviceLoss();
protected:
virtual void FinishImpl() = 0;
virtual void HandleShutDownImpl() = 0;
virtual void HandleDeviceLossImpl() = 0;
private:
enum class State {
Normal,
HandleShutDown,
HandleDeviceLoss,
};
State mState = State::Normal;
};
class CallbackTaskManager : public RefCounted {
public:
CallbackTaskManager();
~CallbackTaskManager() override;
void AddCallbackTask(std::unique_ptr<CallbackTask> callbackTask);
void AddCallbackTask(std::function<void()> callback);
template <typename... Args>
void AddCallbackTask(void (*callback)(Args... args), Args... args) {
static_assert((!IsCString<Args>::value && ...), "passing C string argument is not allowed");
AddCallbackTask([=] { callback(args...); });
}
bool IsEmpty();
void HandleDeviceLoss();
void HandleShutDown();
void Flush();
private:
std::vector<std::unique_ptr<CallbackTask>> AcquireCallbackTasks();
std::mutex mCallbackTaskQueueMutex;
std::vector<std::unique_ptr<CallbackTask>> mCallbackTaskQueue;
};
} // namespace dawn::native
#endif // SRC_DAWN_NATIVE_CALLBACKTASKMANAGER_H_