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// 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 "sync/internal_api/public/base/cancelation_signal.h"
#include "base/logging.h"
#include "sync/internal_api/public/base/cancelation_observer.h"
namespace syncer {
CancelationSignal::CancelationSignal()
: signalled_(false),
handler_(NULL) { }
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_ = NULL;
}
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
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