// Copyright (C) 2019 The Android Open Source Project // Copyright (C) 2019 Google Inc. // // 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. #pragma once #include <functional> #include <memory> #include <vector> namespace gfxstream { namespace guest { // WorkPool provides a way to queue several different + arbitrary wait / signal // operations. There is no specific imposed order to the operations; all // ordering is derived from dependencies among the queued tasks. The number of // threads used is the number of concurrent tasks in flight. Tasks are sent in // groups, representing a collection that can be waited on (a wait group). class WorkPool { public: using Task = std::function<void()>; using WaitGroupHandle = uint64_t; using TimeoutUs = uint64_t; WorkPool(int numInitialThreads = 4); ~WorkPool(); WaitGroupHandle schedule(const std::vector<Task>& tasks); bool waitAny(WaitGroupHandle waitGroup, TimeoutUs timeout = -1); bool waitAll(WaitGroupHandle waitGroup, TimeoutUs timeout = -1); private: class Impl; std::unique_ptr<Impl> mImpl; }; } // namespace guest } // namespace gfxstream