| // 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/macros.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 "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_ |