1 /* 2 * Copyright (C) 2019 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "perfetto/ext/base/waitable_event.h" 18 19 namespace perfetto { 20 namespace base { 21 22 WaitableEvent::WaitableEvent() = default; 23 WaitableEvent::~WaitableEvent() = default; 24 Wait(uint64_t notifications)25void WaitableEvent::Wait(uint64_t notifications) 26 PERFETTO_NO_THREAD_SAFETY_ANALYSIS { 27 // 'std::unique_lock' lock doesn't work well with thread annotations 28 // (see https://github.com/llvm/llvm-project/issues/63239), 29 // so we suppress thread safety static analysis for this method. 30 std::unique_lock<std::mutex> lock(mutex_); 31 return event_.wait(lock, [&]() PERFETTO_EXCLUSIVE_LOCKS_REQUIRED(mutex_) { 32 return notifications_ >= notifications; 33 }); 34 } 35 Notify()36void WaitableEvent::Notify() { 37 std::lock_guard<std::mutex> lock(mutex_); 38 ++notifications_; 39 event_.notify_all(); 40 } 41 42 } // namespace base 43 } // namespace perfetto 44