Files
nearby/cpp/platform/base/cancellation_flag.h
T
hai007 e87e3a0814 OSS fixes
Signed-off-by: hai007 <hais@google.com>
2021-01-22 13:12:25 -08:00

52 lines
1.6 KiB
C++

// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef PLATFORM_BASE_CANCELLATION_FLAG_H_
#define PLATFORM_BASE_CANCELLATION_FLAG_H_
#include <memory>
#include "absl/synchronization/mutex.h"
namespace location {
namespace nearby {
// A cancellation flag to mark an operation has been cancelled and should be
// cleaned up as soon as possible.
class CancellationFlag {
public:
CancellationFlag();
explicit CancellationFlag(bool cancelled);
CancellationFlag(const CancellationFlag &) = delete;
CancellationFlag &operator=(const CancellationFlag &) = delete;
CancellationFlag(CancellationFlag &&) = default;
CancellationFlag &operator=(CancellationFlag &&) = default;
virtual ~CancellationFlag() = default;
// Set the flag as cancelled.
void Cancel() ABSL_LOCKS_EXCLUDED(mutex_);
// Returns true if the flag has been set to cancelled.
bool Cancelled() const ABSL_LOCKS_EXCLUDED(mutex_);
private:
std::unique_ptr<absl::Mutex> mutex_;
bool cancelled_ ABSL_GUARDED_BY(mutex_) = false;
};
} // namespace nearby
} // namespace location
#endif // PLATFORM_BASE_CANCELLATION_FLAG_H_