| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * 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 INCLUDE_PERFETTO_EXT_BASE_WAITABLE_EVENT_H_ |
| #define INCLUDE_PERFETTO_EXT_BASE_WAITABLE_EVENT_H_ |
| |
| #include <condition_variable> |
| #include <mutex> |
| |
| namespace perfetto { |
| namespace base { |
| |
| // A waitable event for cross-thread synchronization. |
| // All methods on this class can be called from any thread. |
| class WaitableEvent { |
| public: |
| WaitableEvent(); |
| ~WaitableEvent(); |
| WaitableEvent(const WaitableEvent&) = delete; |
| WaitableEvent operator=(const WaitableEvent&) = delete; |
| |
| // Synchronously block until the event is notified. |
| void Wait(); |
| |
| // Signal the event, waking up blocked waiters. |
| void Notify(); |
| |
| private: |
| std::mutex mutex_; |
| std::condition_variable event_; |
| bool notified_ = false; |
| }; |
| |
| } // namespace base |
| } // namespace perfetto |
| |
| #endif // INCLUDE_PERFETTO_EXT_BASE_WAITABLE_EVENT_H_ |