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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 
CancelationSignal()12 CancelationSignal::CancelationSignal()
13   : signalled_(false),
14     handler_(NULL) { }
15 
~CancelationSignal()16 CancelationSignal::~CancelationSignal() {
17   DCHECK(!handler_);
18 }
19 
TryRegisterHandler(CancelationObserver * handler)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 
UnregisterHandler(CancelationObserver * handler)31 void CancelationSignal::UnregisterHandler(CancelationObserver* handler) {
32   base::AutoLock lock(signal_lock_);
33   DCHECK_EQ(handler_, handler);
34   handler_ = NULL;
35 }
36 
IsSignalled()37 bool CancelationSignal::IsSignalled() {
38   base::AutoLock lock(signal_lock_);
39   return signalled_;
40 }
41 
Signal()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