Add embedder::AsyncWait()

mojo/edk/system/core.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_CORE_H_
 #define MOJO_EDK_SYSTEM_CORE_H_
 
 #include <stdint.h>
 
+#include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
 #include "mojo/edk/system/handle_table.h"
 #include "mojo/edk/system/mapping_table.h"
 #include "mojo/edk/system/memory.h"
 #include "mojo/edk/system/system_impl_export.h"
 #include "mojo/public/c/system/buffer.h"
 #include "mojo/public/c/system/data_pipe.h"
@@ skipping 22 matching lines @@
   virtual ~Core();
 
   // Adds |dispatcher| to the handle table, returning the handle for it. Returns
   // |MOJO_HANDLE_INVALID| on failure, namely if the handle table is full.
   MojoHandle AddDispatcher(const scoped_refptr<Dispatcher>& dispatcher);
 
   // Looks up the dispatcher for the given handle. Returns null if the handle is
   // invalid.
   scoped_refptr<Dispatcher> GetDispatcher(MojoHandle handle);
 
+  // Watches on the given handle for the given signals, calling |callback| when
+  // a signal is satisfied or when all signals become unsatisfiable. |callback|
+  // must satisfy stringent requirements -- see |Awakable::Awake()| in
+  // awakable.h. In particular, it must not call any Mojo system functions.
+  MojoResult AsyncWait(MojoHandle handle,
+                       MojoHandleSignals signals,
+                       base::Callback<void(MojoResult)> callback);
+
   embedder::PlatformSupport* platform_support() const {
     return platform_support_.get();
   }
 
   // ---------------------------------------------------------------------------
 
   // System calls implementation:
   MojoTimeTicks GetTimeTicksNow();
   MojoResult Close(MojoHandle handle);
   MojoResult Wait(MojoHandle handle,
@@ skipping 85 matching lines @@
   base::Lock mapping_table_lock_;  // Protects |mapping_table_|.
   MappingTable mapping_table_;
 
   DISALLOW_COPY_AND_ASSIGN(Core);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_CORE_H_