Mojo: AsyncWaiter and mojo/public/environment

mojo/public/bindings/lib/bindings_support.h

-// Copyright 2013 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 MOJO_PUBLIC_BINDINGS_LIB_BINDINGS_SUPPORT_H_
-#define MOJO_PUBLIC_BINDINGS_LIB_BINDINGS_SUPPORT_H_
-
-#include "mojo/public/system/core_cpp.h"
-
-namespace mojo {
-class Buffer;
-
-// An embedder of the bindings library MUST implement BindingsSupport and call
-// BindingsSupport::Set prior to using the library.
-class BindingsSupport {
- public:
-  class AsyncWaitCallback {
-   public:
-    virtual ~AsyncWaitCallback() {}
-    virtual void OnHandleReady(MojoResult result) = 0;
-  };
-
-  typedef void* AsyncWaitID;
-
-  static void Set(BindingsSupport* support);
-  static BindingsSupport* Get();
-
-  // Get/set the current thread's Buffer pointer. SetCurrentBuffer returns the
-  // previously current Buffer.
-  virtual Buffer* GetCurrentBuffer() = 0;
-  virtual Buffer* SetCurrentBuffer(Buffer* buf) = 0;
-
-  // Asynchronously call MojoWait on a background thread, and pass the result
-  // of MojoWait to the given AsyncWaitCallback on the current thread.  Returns
-  // an AsyncWaitID that can be used with CancelWait to stop waiting. This
-  // identifier becomes invalid once the callback runs.
-  virtual AsyncWaitID AsyncWait(const Handle& handle,
-                                MojoWaitFlags flags,
-                                AsyncWaitCallback* callback) = 0;
-
-  // Cancel an existing call to AsyncWait with the given AsyncWaitID. The
-  // corresponding AsyncWaitCallback's OnHandleReady method will not be called
-  // in this case.
-  virtual void CancelWait(AsyncWaitID id) = 0;
-
- protected:
-  virtual ~BindingsSupport() {}
-};
-
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_BINDINGS_LIB_BINDINGS_SUPPORT_H_