| // 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. |
| |
| #include "dawn_platform/WorkerThread.h" |
| |
| #include <future> |
| |
| #include "common/Assert.h" |
| |
| namespace { |
| |
| class AsyncWaitableEvent final : public dawn_platform::WaitableEvent { |
| public: |
| explicit AsyncWaitableEvent(std::function<void()> func) { |
| mFuture = std::async(std::launch::async, func); |
| } |
| void Wait() override { |
| ASSERT(mFuture.valid()); |
| mFuture.wait(); |
| } |
| bool IsComplete() override { |
| ASSERT(mFuture.valid()); |
| return mFuture.wait_for(std::chrono::seconds(0)) == std::future_status::ready; |
| } |
| |
| private: |
| // It is safe not to call Wait() in the destructor of AsyncWaitableEvent because since |
| // C++14 the destructor of std::future will always be blocked until its state becomes |
| // std::future_status::ready when it was created by a call of std::async and it is the |
| // last reference to the shared state. |
| // See https://en.cppreference.com/w/cpp/thread/future/~future for more details. |
| std::future<void> mFuture; |
| }; |
| |
| } // anonymous namespace |
| |
| std::unique_ptr<dawn_platform::WaitableEvent> AsyncWorkerThreadPool::PostWorkerTask( |
| dawn_platform::PostWorkerTaskCallback callback, |
| void* userdata) { |
| std::function<void()> doTask = [callback, userdata]() { callback(userdata); }; |
| return std::make_unique<AsyncWaitableEvent>(doTask); |
| } |