[email protected] | 399ed42 | 2012-12-27 19:58:00 | [diff] [blame] | 1 | // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "base/sequence_checker_impl.h" |
| 6 | |
fdoray | eed5fa7 | 2016-07-26 22:28:45 | [diff] [blame] | 7 | #include "base/logging.h" |
tzik | 0c2fcf5 | 2017-02-16 08:52:31 | [diff] [blame] | 8 | #include "base/memory/ptr_util.h" |
| 9 | #include "base/sequence_token.h" |
| 10 | #include "base/threading/sequenced_worker_pool.h" |
| 11 | #include "base/threading/thread_checker_impl.h" |
fdoray | eed5fa7 | 2016-07-26 22:28:45 | [diff] [blame] | 12 | |
[email protected] | 399ed42 | 2012-12-27 19:58:00 | [diff] [blame] | 13 | namespace base { |
| 14 | |
tzik | 0c2fcf5 | 2017-02-16 08:52:31 | [diff] [blame] | 15 | class SequenceCheckerImpl::Core { |
| 16 | public: |
| 17 | Core() |
| 18 | : sequence_token_(SequenceToken::GetForCurrentThread()), |
| 19 | sequenced_worker_pool_token_( |
| 20 | SequencedWorkerPool::GetSequenceTokenForCurrentThread()) { |
| 21 | // SequencedWorkerPool doesn't use SequenceToken and code outside of |
| 22 | // SequenceWorkerPool doesn't set a SequencedWorkerPool token. |
| 23 | DCHECK(!sequence_token_.IsValid() || |
| 24 | !sequenced_worker_pool_token_.IsValid()); |
| 25 | } |
[email protected] | 399ed42 | 2012-12-27 19:58:00 | [diff] [blame] | 26 | |
tzik | 0c2fcf5 | 2017-02-16 08:52:31 | [diff] [blame] | 27 | ~Core() = default; |
| 28 | |
| 29 | bool CalledOnValidThread() const { |
| 30 | if (sequence_token_.IsValid()) |
| 31 | return sequence_token_ == SequenceToken::GetForCurrentThread(); |
| 32 | |
| 33 | if (sequenced_worker_pool_token_.IsValid()) { |
| 34 | return sequenced_worker_pool_token_.Equals( |
| 35 | SequencedWorkerPool::GetSequenceTokenForCurrentThread()); |
| 36 | } |
| 37 | |
| 38 | // SequenceChecker behaves as a ThreadChecker when it is not bound to a |
| 39 | // valid sequence token. |
| 40 | return thread_checker_.CalledOnValidThread(); |
| 41 | } |
| 42 | |
| 43 | private: |
| 44 | SequenceToken sequence_token_; |
| 45 | |
| 46 | // TODO(gab): Remove this when SequencedWorkerPool is deprecated in favor of |
| 47 | // TaskScheduler. crbug.com/622400 |
| 48 | SequencedWorkerPool::SequenceToken sequenced_worker_pool_token_; |
| 49 | |
| 50 | // Used when |sequenced_worker_pool_token_| and |sequence_token_| are invalid. |
| 51 | ThreadCheckerImpl thread_checker_; |
| 52 | }; |
| 53 | |
| 54 | SequenceCheckerImpl::SequenceCheckerImpl() : core_(MakeUnique<Core>()) {} |
fdoray | eed5fa7 | 2016-07-26 22:28:45 | [diff] [blame] | 55 | SequenceCheckerImpl::~SequenceCheckerImpl() = default; |
[email protected] | 399ed42 | 2012-12-27 19:58:00 | [diff] [blame] | 56 | |
fdoray | e2b19a1 | 2016-07-29 02:30:16 | [diff] [blame] | 57 | bool SequenceCheckerImpl::CalledOnValidSequence() const { |
[email protected] | 399ed42 | 2012-12-27 19:58:00 | [diff] [blame] | 58 | AutoLock auto_lock(lock_); |
tzik | 0c2fcf5 | 2017-02-16 08:52:31 | [diff] [blame] | 59 | if (!core_) |
| 60 | core_ = MakeUnique<Core>(); |
| 61 | return core_->CalledOnValidThread(); |
[email protected] | 399ed42 | 2012-12-27 19:58:00 | [diff] [blame] | 62 | } |
| 63 | |
[email protected] | d52426c | 2013-07-30 19:26:40 | [diff] [blame] | 64 | void SequenceCheckerImpl::DetachFromSequence() { |
[email protected] | 399ed42 | 2012-12-27 19:58:00 | [diff] [blame] | 65 | AutoLock auto_lock(lock_); |
tzik | 0c2fcf5 | 2017-02-16 08:52:31 | [diff] [blame] | 66 | core_.reset(); |
[email protected] | 399ed42 | 2012-12-27 19:58:00 | [diff] [blame] | 67 | } |
| 68 | |
| 69 | } // namespace base |