[mojo-edk] Add MojoWatch and MojoCancelWatch APIs

mojo/edk/system/dispatcher.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_EDK_SYSTEM_DISPATCHER_H_
 #define MOJO_EDK_SYSTEM_DISPATCHER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <ostream>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
 #include "mojo/edk/embedder/platform_handle.h"
 #include "mojo/edk/embedder/platform_shared_buffer.h"
 #include "mojo/edk/system/handle_signals_state.h"
 #include "mojo/edk/system/ports/name.h"
 #include "mojo/edk/system/system_impl_export.h"
+#include "mojo/edk/system/watcher.h"
 #include "mojo/public/c/system/buffer.h"
 #include "mojo/public/c/system/data_pipe.h"
 #include "mojo/public/c/system/message_pipe.h"
 #include "mojo/public/c/system/types.h"
 
 namespace mojo {
 namespace edk {
 
 class Awakable;
 class Dispatcher;
@@ skipping 25 matching lines @@
 
     // "Private" types (not exposed via the public interface):
     PLATFORM_HANDLE = -1,
   };
 
   // All Dispatchers must minimally implement these methods.
 
   virtual Type GetType() const = 0;
   virtual MojoResult Close() = 0;
 
+  ///////////// Watch API ////////////////////
+
+  virtual MojoResult Watch(MojoHandleSignals signals,
+                           const Watcher::WatchCallback& callback,
+                           uintptr_t context);
+
+  virtual MojoResult CancelWatch(uintptr_t context);
+
   ///////////// Message pipe API /////////////
 
   virtual MojoResult WriteMessage(const void* bytes,
                                   uint32_t num_bytes,
                                   const DispatcherInTransit* dispatchers,
                                   uint32_t num_dispatchers,
                                   MojoWriteMessageFlags flags);
 
   virtual MojoResult ReadMessage(void* bytes,
                                  uint32_t* num_bytes,
@@ skipping 163 matching lines @@
 // So logging macros and |DCHECK_EQ()|, etc. work.
 MOJO_SYSTEM_IMPL_EXPORT inline std::ostream& operator<<(std::ostream& out,
                                                         Dispatcher::Type type) {
   return out << static_cast<int>(type);
 }
 
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_DISPATCHER_H_