1 // Copyright 2021 The Dawn Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef DAWNNATIVE_ASYC_TASK_H_ 16 #define DAWNNATIVE_ASYC_TASK_H_ 17 18 #include <functional> 19 #include <memory> 20 #include <mutex> 21 #include <unordered_map> 22 23 #include "common/RefCounted.h" 24 25 namespace dawn_platform { 26 class WaitableEvent; 27 class WorkerTaskPool; 28 } // namespace dawn_platform 29 30 namespace dawn_native { 31 32 // TODO(crbug.com/dawn/826): we'll add additional things to AsyncTask in the future, like 33 // Cancel() and RunNow(). Cancelling helps avoid running the task's body when we are just 34 // shutting down the device. RunNow() could be used for more advanced scenarios, for example 35 // always doing ShaderModule initial compilation asynchronously, but being able to steal the 36 // task if we need it for synchronous pipeline compilation. 37 using AsyncTask = std::function<void()>; 38 39 class AsyncTaskManager { 40 public: 41 explicit AsyncTaskManager(dawn_platform::WorkerTaskPool* workerTaskPool); 42 43 void PostTask(AsyncTask asyncTask); 44 void WaitAllPendingTasks(); 45 bool HasPendingTasks(); 46 47 private: 48 class WaitableTask : public RefCounted { 49 public: 50 AsyncTask asyncTask; 51 AsyncTaskManager* taskManager; 52 std::unique_ptr<dawn_platform::WaitableEvent> waitableEvent; 53 }; 54 55 static void DoWaitableTask(void* task); 56 void HandleTaskCompletion(WaitableTask* task); 57 58 std::mutex mPendingTasksMutex; 59 std::unordered_map<WaitableTask*, Ref<WaitableTask>> mPendingTasks; 60 dawn_platform::WorkerTaskPool* mWorkerTaskPool; 61 }; 62 63 } // namespace dawn_native 64 65 #endif 66