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// Copyright 2021 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef SRC_DAWN_NATIVE_ASYNCTASK_H_
#define SRC_DAWN_NATIVE_ASYNCTASK_H_
#include <functional>
#include <memory>
#include <mutex>
#include <unordered_map>
#include "dawn/common/Ref.h"
#include "dawn/common/RefCounted.h"
namespace dawn::platform {
class WaitableEvent;
class WorkerTaskPool;
} // namespace dawn::platform
namespace dawn::native {
// TODO(crbug.com/dawn/826): we'll add additional things to AsyncTask in the future, like
// Cancel() and RunNow(). Cancelling helps avoid running the task's body when we are just
// shutting down the device. RunNow() could be used for more advanced scenarios, for example
// always doing ShaderModule initial compilation asynchronously, but being able to steal the
// task if we need it for synchronous pipeline compilation.
using AsyncTask = std::function<void()>;
class AsyncTaskManager {
public:
explicit AsyncTaskManager(dawn::platform::WorkerTaskPool* workerTaskPool);
void PostTask(AsyncTask asyncTask);
void WaitAllPendingTasks();
bool HasPendingTasks();
private:
class WaitableTask : public RefCounted {
public:
WaitableTask();
~WaitableTask() override;
AsyncTask asyncTask;
AsyncTaskManager* taskManager;
std::unique_ptr<dawn::platform::WaitableEvent> waitableEvent;
};
static void DoWaitableTask(void* task);
void HandleTaskCompletion(WaitableTask* task);
std::mutex mPendingTasksMutex;
std::unordered_map<WaitableTask*, Ref<WaitableTask>> mPendingTasks;
dawn::platform::WorkerTaskPool* mWorkerTaskPool;
};
} // namespace dawn::native
#endif // SRC_DAWN_NATIVE_ASYNCTASK_H_