1 /* 2 * Copyright (C) 2017 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/base/thread_checker.h" 18 19 #if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN) 20 #include <Windows.h> 21 #endif 22 23 namespace perfetto { 24 namespace base { 25 26 namespace { 27 constexpr ThreadID kDetached{}; 28 29 ThreadID CurrentThreadId() { 30 #if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN) 31 return ::GetCurrentThreadId(); 32 #else 33 return pthread_self(); 34 #endif 35 } 36 } // namespace 37 38 ThreadChecker::ThreadChecker() { 39 thread_id_.store(CurrentThreadId()); 40 } 41 42 ThreadChecker::~ThreadChecker() = default; 43 44 ThreadChecker::ThreadChecker(const ThreadChecker& other) { 45 thread_id_ = other.thread_id_.load(); 46 } 47 48 ThreadChecker& ThreadChecker::operator=(const ThreadChecker& other) { 49 thread_id_ = other.thread_id_.load(); 50 return *this; 51 } 52 53 bool ThreadChecker::CalledOnValidThread() const { 54 auto self = CurrentThreadId(); 55 56 // Will re-attach if previously detached using DetachFromThread(). 57 auto prev_value = kDetached; 58 if (thread_id_.compare_exchange_strong(prev_value, self)) 59 return true; 60 return prev_value == self; 61 } 62 63 void ThreadChecker::DetachFromThread() { 64 thread_id_.store(kDetached); 65 } 66 67 } // namespace base 68 } // namespace perfetto 69
