Renamed and shifted around a few native code files.

src/native/linux/juce_linux_Messaging.cpp

@@ -395,26 +395,47 @@ void MessageManager::broadcastMessage (const String& value)
     /* TODO */
 }
 
+
+//==============================================================================
+class AsyncFunctionCaller   : public AsyncUpdater
+{
+public:
+    static void* call (MessageCallbackFunction* func_, void* parameter_)
+    {
+        if (MessageManager::getInstance()->isThisTheMessageThread())
+            return func_ (parameter_);
+
+        AsyncFunctionCaller caller (func_, parameter_);
+        caller.triggerAsyncUpdate();
+        caller.finished.wait();
+        return caller.result;
+    }
+
+    void handleAsyncUpdate()
+    {
+        result = (*func) (parameter);
+        finished.signal();
+    }
+
+private:
+    WaitableEvent finished;
+    MessageCallbackFunction* func;
+    void* parameter;
+    void* volatile result;
+
+    AsyncFunctionCaller (MessageCallbackFunction* func_, void* parameter_)
+        : result (0), func (func_), parameter (parameter_)
+    {}
+
+    JUCE_DECLARE_NON_COPYABLE (AsyncFunctionCaller);
+};
+
 void* MessageManager::callFunctionOnMessageThread (MessageCallbackFunction* func, void* parameter)
 {
     if (LinuxErrorHandling::errorOccurred)
         return 0;
 
-    if (isThisTheMessageThread())
-        return func (parameter);
-
-    InternalMessageQueue::MessageThreadFuncCall messageCallContext;
-    messageCallContext.func = func;
-    messageCallContext.parameter = parameter;
-
-    InternalMessageQueue::getInstanceWithoutCreating()
-        ->postMessage (new Message (InternalMessageQueue::MessageThreadFuncCall::uniqueID,
-                                    0, 0, &messageCallContext));
-
-    // Wait for it to complete before continuing
-    messageCallContext.event.wait();
-
-    return messageCallContext.result;
+    return AsyncFunctionCaller::call (func, parameter);
 }
 
 // this function expects that it will NEVER be called simultaneously for two concurrent threads