From 783913e79c0e5a77461a1ac99b0a3fba8498fe0b Mon Sep 17 00:00:00 2001
From: Tobias Doerffel <tobias.doerffel@gmail.com>
Date: Mon, 14 Dec 2009 11:10:30 +0100
Subject: [PATCH] RemotePlugin: sleep in waitForMessage() when actively waiting
 for data

RemotePlugin::waitForMessage() can operate in polling mode which is used
when loading a remote plugin so the master application does not block
until the remote plugin has been loaded. This is achieved by calling
QCoreApplication::processEvents().

However if there're no events to process, the polling loop will just eat
up CPU time which is especially bad when on a single core system.
This has been fixed by inserting short sleeps.
---
 include/RemotePlugin.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/RemotePlugin.h b/include/RemotePlugin.h
index 1fef44622..9b8710d17 100644
--- a/include/RemotePlugin.h
+++ b/include/RemotePlugin.h
@@ -36,6 +36,7 @@
 #include <cassert>
 
 #ifdef LMMS_BUILD_WIN32
+#include <windows.h>
 #define USE_QT_SEMAPHORES
 #define USE_QT_SHMEM
 #endif
@@ -966,6 +967,11 @@ RemotePluginBase::message RemotePluginBase::waitForMessage(
 		{
 			QCoreApplication::processEvents(
 				QEventLoop::ExcludeUserInputEvents, 50 );
+#ifdef LMMS_BUILD_WIN32
+			Sleep( 5 );
+#else
+			usleep( 5 * 1000 );
+#endif
 			continue;
 		}
 #endif