| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "components/sync/base/cancelation_signal.h" |
| |
| #include "base/logging.h" |
| #include "components/sync/base/cancelation_observer.h" |
| |
| namespace syncer { |
| |
| CancelationSignal::CancelationSignal() : signalled_(false), handler_(nullptr) {} |
| |
| CancelationSignal::~CancelationSignal() { |
| DCHECK(!handler_); |
| } |
| |
| bool CancelationSignal::TryRegisterHandler(CancelationObserver* handler) { |
| base::AutoLock lock(signal_lock_); |
| DCHECK(!handler_); |
| |
| if (signalled_) |
| return false; |
| |
| handler_ = handler; |
| return true; |
| } |
| |
| void CancelationSignal::UnregisterHandler(CancelationObserver* handler) { |
| base::AutoLock lock(signal_lock_); |
| DCHECK_EQ(handler_, handler); |
| handler_ = nullptr; |
| } |
| |
| bool CancelationSignal::IsSignalled() { |
| base::AutoLock lock(signal_lock_); |
| return signalled_; |
| } |
| |
| void CancelationSignal::Signal() { |
| base::AutoLock lock(signal_lock_); |
| DCHECK(!signalled_); |
| |
| signalled_ = true; |
| if (handler_) { |
| handler_->OnSignalReceived(); |
| } |
| } |
| |
| } // namespace syncer |