device/serial/async_waiter.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef DEVICE_SERIAL_ASYNC_WAITER_H_
   6 #define DEVICE_SERIAL_ASYNC_WAITER_H_
   7
   8 #include "base/callback.h"
   9 #include "mojo/public/c/environment/async_waiter.h"
  10 #include "mojo/public/cpp/environment/environment.h"
  11 #include "mojo/public/cpp/system/handle.h"
  12
  13 namespace device {
  14
  15 // A class that waits until a handle is ready and calls |callback| with the
  16 // result. If the AsyncWaiter is deleted before the handle is ready, the wait is
  17 // cancelled and the callback will not be called.
  18 class AsyncWaiter {
  19  public:
  20   typedef base::Callback<void(MojoResult)> Callback;
  21
  22   AsyncWaiter(mojo::Handle handle,
  23               MojoHandleSignals signals,
  24               const Callback& callback);
  25   ~AsyncWaiter();
  26
  27  private:
  28   static void WaitComplete(void* waiter, MojoResult result);
  29   void WaitCompleteInternal(MojoResult result);
  30
  31   const MojoAsyncWaiter* waiter_;
  32   MojoAsyncWaitID id_;
  33   const Callback callback_;
  34
  35   DISALLOW_COPY_AND_ASSIGN(AsyncWaiter);
  36 };
  37
  38 }  // namespace device
  39
  40 #endif  // DEVICE_SERIAL_ASYNC_WAITER_H_