Added usb video example

examples/usb-video/common/ThreadIpcService.cpp

@@ -0,0 +1,33 @@
+#include "common.h"
+#include "ThreadIpcService.h"
+
+void ThreadIpcService::ThreadMain()
+{
+    while (true)
+    {
+        rtos_waitEvent(&_event, false, true);
+        if (_messageValid)
+        {
+            _messageValid = false;
+            HandleMessage(_message);
+        }
+    }
+}
+
+void ThreadIpcService::Start()
+{
+    rtos_createEvent(&_event);
+    rtos_createThread(&_thread, 5, [] (void* arg)
+    {
+        static_cast<ThreadIpcService*>(arg)->ThreadMain();
+    }, this, _stack, _stackSize);
+    rtos_wakeupThread(&_thread);
+    IpcService::Start();
+}
+
+void ThreadIpcService::OnMessageReceived(u32 data)
+{
+    _message = data;
+    _messageValid = true;
+    rtos_signalEvent(&_event);
+}