akalin@chromium.org | 4fb2deb | 2012-12-28 04:58:00 +0900 | [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 | |
akalin@chromium.org | 4fb2deb | 2012-12-28 04:58:00 +0900 | [diff] [blame] | 7 | namespace base { |
| 8 | |
tommycli@chromium.org | 623e16c | 2013-07-31 04:26:40 +0900 | [diff] [blame] | 9 | SequenceCheckerImpl::SequenceCheckerImpl() |
| 10 | : sequence_token_assigned_(false) { |
| 11 | AutoLock auto_lock(lock_); |
| 12 | EnsureSequenceTokenAssigned(); |
| 13 | } |
akalin@chromium.org | 4fb2deb | 2012-12-28 04:58:00 +0900 | [diff] [blame] | 14 | |
| 15 | SequenceCheckerImpl::~SequenceCheckerImpl() {} |
| 16 | |
tommycli@chromium.org | 623e16c | 2013-07-31 04:26:40 +0900 | [diff] [blame] | 17 | bool SequenceCheckerImpl::CalledOnValidSequencedThread() const { |
akalin@chromium.org | 4fb2deb | 2012-12-28 04:58:00 +0900 | [diff] [blame] | 18 | AutoLock auto_lock(lock_); |
tommycli@chromium.org | 623e16c | 2013-07-31 04:26:40 +0900 | [diff] [blame] | 19 | EnsureSequenceTokenAssigned(); |
| 20 | |
| 21 | // If this thread is not associated with a SequencedWorkerPool, |
| 22 | // SequenceChecker behaves as a ThreadChecker. See header for details. |
| 23 | if (!sequence_token_.IsValid()) |
| 24 | return thread_checker_.CalledOnValidThread(); |
| 25 | |
| 26 | return sequence_token_.Equals( |
| 27 | SequencedWorkerPool::GetSequenceTokenForCurrentThread()); |
akalin@chromium.org | 4fb2deb | 2012-12-28 04:58:00 +0900 | [diff] [blame] | 28 | } |
| 29 | |
tommycli@chromium.org | 623e16c | 2013-07-31 04:26:40 +0900 | [diff] [blame] | 30 | void SequenceCheckerImpl::DetachFromSequence() { |
akalin@chromium.org | 4fb2deb | 2012-12-28 04:58:00 +0900 | [diff] [blame] | 31 | AutoLock auto_lock(lock_); |
akalin@chromium.org | 4fb2deb | 2012-12-28 04:58:00 +0900 | [diff] [blame] | 32 | thread_checker_.DetachFromThread(); |
tommycli@chromium.org | 623e16c | 2013-07-31 04:26:40 +0900 | [diff] [blame] | 33 | sequence_token_assigned_ = false; |
| 34 | sequence_token_ = SequencedWorkerPool::SequenceToken(); |
| 35 | } |
| 36 | |
| 37 | void SequenceCheckerImpl::EnsureSequenceTokenAssigned() const { |
| 38 | lock_.AssertAcquired(); |
| 39 | if (sequence_token_assigned_) |
| 40 | return; |
| 41 | |
| 42 | sequence_token_assigned_ = true; |
| 43 | sequence_token_ = SequencedWorkerPool::GetSequenceTokenForCurrentThread(); |
akalin@chromium.org | 4fb2deb | 2012-12-28 04:58:00 +0900 | [diff] [blame] | 44 | } |
| 45 | |
| 46 | } // namespace base |