Primiano Tucci | 575af77 | 2017-11-08 18:14:17 +0000 | [diff] [blame] | 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 | |
Oystein Eftevaag | dd727e4 | 2017-12-05 08:49:55 -0800 | [diff] [blame^] | 17 | #include "perfetto_base/thread_checker.h" |
Primiano Tucci | 575af77 | 2017-11-08 18:14:17 +0000 | [diff] [blame] | 18 | |
| 19 | namespace perfetto { |
| 20 | namespace base { |
| 21 | |
| 22 | namespace { |
| 23 | constexpr pthread_t kDetached = 0; |
| 24 | } // namespace |
| 25 | |
| 26 | ThreadChecker::ThreadChecker() { |
| 27 | thread_id_.store(pthread_self()); |
| 28 | } |
| 29 | |
| 30 | ThreadChecker::~ThreadChecker() = default; |
| 31 | |
| 32 | ThreadChecker::ThreadChecker(const ThreadChecker& other) { |
| 33 | thread_id_ = other.thread_id_.load(); |
| 34 | } |
| 35 | |
| 36 | ThreadChecker& ThreadChecker::operator=(const ThreadChecker& other) { |
| 37 | thread_id_ = other.thread_id_.load(); |
| 38 | return *this; |
| 39 | } |
| 40 | |
| 41 | bool ThreadChecker::CalledOnValidThread() const { |
| 42 | pthread_t self = pthread_self(); |
| 43 | |
| 44 | // Will re-attach if previously detached using DetachFromThread(). |
| 45 | pthread_t prev_value = kDetached; |
| 46 | if (thread_id_.compare_exchange_strong(prev_value, self)) |
| 47 | return true; |
| 48 | return prev_value == self; |
| 49 | } |
| 50 | |
| 51 | void ThreadChecker::DetachFromThread() { |
| 52 | thread_id_.store(kDetached); |
| 53 | } |
| 54 | |
| 55 | } // namespace base |
| 56 | } // namespace perfetto |