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// Copyright 2015 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_ASYNC_HANDLE_WAITER_H_
#define IPC_MOJO_ASYNC_HANDLE_WAITER_H_
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop.h"
#include "ipc/ipc_export.h"
#include "third_party/mojo/src/mojo/public/c/system/types.h"
namespace IPC {
namespace internal {
// |AsyncHandleWaiter| waits on a mojo handle asynchronously and
// invokes the given |callback| through |runner| when it is signaled.
// * To start waiting, the client must call |AsyncHandleWaiter::Wait()|.
// The client can call |Wait()| again once it is signaled and
// the |callback| is invoked.
// * To cancel waiting, delete the instance.
//
// |AsyncHandleWaiter| must be created, used and deleted only from the IO
// |thread.
class IPC_MOJO_EXPORT AsyncHandleWaiter {
public:
class Context;
explicit AsyncHandleWaiter(base::Callback<void(MojoResult)> callback);
~AsyncHandleWaiter();
MojoResult Wait(MojoHandle handle, MojoHandleSignals signals);
base::MessageLoopForIO::IOObserver* GetIOObserverForTest();
base::Callback<void(MojoResult)> GetWaitCallbackForTest();
private:
void InvokeCallback(MojoResult result);
scoped_refptr<Context> context_;
base::Callback<void(MojoResult)> callback_;
base::WeakPtrFactory<AsyncHandleWaiter> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(AsyncHandleWaiter);
};
} // namespace internal
} // namespace IPC
#endif // IPC_MOJO_ASYNC_HANDLE_WAITER_H_
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