chromium/mojo/public/cpp/system/simple_watcher.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_SIMPLE_WATCHER_H_
#define MOJO_PUBLIC_CPP_SYSTEM_SIMPLE_WATCHER_H_

#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/location.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/task/sequenced_task_runner.h"
#include "mojo/public/c/system/types.h"
#include "mojo/public/cpp/system/handle_signals_state.h"
#include "mojo/public/cpp/system/system_export.h"
#include "mojo/public/cpp/system/trap.h"

namespace base {
class SequencedTaskRunner;
}

namespace mojo {

// This provides a convenient sequence-bound watcher implementation to safely
// watch a single handle, dispatching state change notifications to an arbitrary
// SequencedTaskRunner running on the same sequence as the SimpleWatcher.
//
// SimpleWatcher exposes the concept of "arming" from the low-level Watcher API.
// In general, a SimpleWatcher must be "armed" in order to dispatch a single
// notification, and must then be rearmed before it will dispatch another. For
// more details, see the documentation for ArmingPolicy and the Arm() and
// ArmOrNotify() methods below.
class MOJO_CPP_SYSTEM_EXPORT SimpleWatcher { … };

}  // namespace mojo

#endif  // MOJO_PUBLIC_CPP_SYSTEM_SIMPLE_WATCHER_H_