chromium/mojo/public/cpp/system/handle_signal_tracker.h

// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MOJO_PUBLIC_CPP_SYSTEM_HANDLE_SIGNAL_TRACKER_H_
#define MOJO_PUBLIC_CPP_SYSTEM_HANDLE_SIGNAL_TRACKER_H_

#include "base/functional/callback.h"
#include "base/task/sequenced_task_runner.h"
#include "mojo/public/c/system/types.h"
#include "mojo/public/cpp/system/handle.h"
#include "mojo/public/cpp/system/simple_watcher.h"
#include "mojo/public/cpp/system/system_export.h"

namespace base {
class SequencedTaskRunner;
}

namespace mojo {

// This class helps track the state of specific signal on a handle so that
// the user doesn't have to manually query the signal state every time they
// want to know the handle's state.
//
// Usage of this class is specifically targeting cases where the signal state
// changes infrequently but must be queried frequently. If either condition does
// not hold, consider using Handle::QuerySignalsState (or
// MojoQueryHandleSignalsState) directly instead.
class MOJO_CPP_SYSTEM_EXPORT HandleSignalTracker { … };

}  // namespace mojo

#endif  // MOJO_PUBLIC_CPP_SYSTEM_HANDLE_SIGNAL_TRACKER_H_