1 // Copyright 2013 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 "sync/internal_api/public/base/cancelation_signal.h" 6 7 #include "base/logging.h" 8 #include "sync/internal_api/public/base/cancelation_observer.h" 9 10 namespace syncer { 11 12 CancelationSignal::CancelationSignal() 13 : signalled_(false), 14 handler_(NULL) { } 15 16 CancelationSignal::~CancelationSignal() { 17 DCHECK(!handler_); 18 } 19 20 bool CancelationSignal::TryRegisterHandler(CancelationObserver* handler) { 21 base::AutoLock lock(signal_lock_); 22 DCHECK(!handler_); 23 24 if (signalled_) 25 return false; 26 27 handler_ = handler; 28 return true; 29 } 30 31 void CancelationSignal::UnregisterHandler(CancelationObserver* handler) { 32 base::AutoLock lock(signal_lock_); 33 DCHECK_EQ(handler_, handler); 34 handler_ = NULL; 35 } 36 37 bool CancelationSignal::IsSignalled() { 38 base::AutoLock lock(signal_lock_); 39 return signalled_; 40 } 41 42 void CancelationSignal::Signal() { 43 base::AutoLock lock(signal_lock_); 44 DCHECK(!signalled_); 45 46 signalled_ = true; 47 if (handler_) { 48 handler_->OnSignalReceived(); 49 } 50 } 51 52 } // namespace syncer 53
