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// Copyright 2016 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.
#ifndef IPC_MOJO_EVENT_H_
#define IPC_MOJO_EVENT_H_
#include "base/macros.h"
#include "base/synchronization/lock.h"
#include "mojo/public/cpp/system/message_pipe.h"
namespace IPC {
// A MojoEvent is a simple wrapper around a Mojo message pipe which supports
// common WaitableEvent-like methods of Signal() and Reset(). This class exists
// to support the transition from legacy IPC to Mojo IPC and is not intended for
// general use outside of src/ipc. Unlike base::WaitableEvent, all MojoEvents
// must be manually reset.
class MojoEvent {
public:
// Constructs a new MojoEvent that is initially not signaled.
MojoEvent();
~MojoEvent();
// Gets a Handle that can be waited on for this MojoEvent. When the Event is
// signaled, this handle will have |MOJO_HANDLE_SIGNAL_READABLE| satisfied.
const mojo::Handle& GetHandle() const { return wait_handle_.get(); }
void Signal();
void Reset();
private:
mojo::ScopedMessagePipeHandle signal_handle_;
mojo::ScopedMessagePipeHandle wait_handle_;
base::Lock lock_;
bool is_signaled_ = false;
DISALLOW_COPY_AND_ASSIGN(MojoEvent);
};
} // namespace IPC
#endif // IPC_MOJO_EVENT_H_
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