From 54f1409090519445558b77ff17e44254ac64fac9 Mon Sep 17 00:00:00 2001
From: "Jake.Stine" <Jake.Stine@96395faa-99c1-11dd-bbfe-3dabce05a288>
Date: Sun, 18 Oct 2009 17:12:02 +0000
Subject: [PATCH] Gave the frame limiter some smarts so it can sleep the EEcore
 a bit if there's nothing to do for a while.

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@2033 96395faa-99c1-11dd-bbfe-3dabce05a288
---
 pcsx2/Counters.cpp | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/pcsx2/Counters.cpp b/pcsx2/Counters.cpp
index 3524e0ba89..a4b53141bd 100644
--- a/pcsx2/Counters.cpp
+++ b/pcsx2/Counters.cpp
@@ -322,11 +322,22 @@ static __forceinline void frameLimit()
 
 	m_iStart = uExpectedEnd;
 
-	while( sDeltaTime < 0 )
+	// Shortcut for cases where no waiting is needed (they're running slow already,
+	// so don't bog 'em down with extra math...)
+	if( sDeltaTime >= 0 ) return;
+	
+	// If we're way ahead then we can afford to sleep the thread a bit.
+
+	s32 msec = (int)((sDeltaTime*-1000) / (s64)GetTickFrequency());
+	if( msec > 2 ) Threading::Sleep( msec - 2 );
+
+	// 
+	while( true )
 	{
-		Timeslice();
 		iEnd = GetCPUTicks();
 		sDeltaTime = iEnd - uExpectedEnd;
+		if( sDeltaTime >= 0 ) break;
+		Timeslice();
 	}
 }