From cd4a9e3fb0469c31462e048e27f9c57c751e998d Mon Sep 17 00:00:00 2001
From: cuz <cuz@b7a2c559-68d2-44c3-8de9-860c34a00d81>
Date: Mon, 5 May 2003 08:20:07 +0000
Subject: [PATCH] Fixed a problem with clock() (Greg King)

git-svn-id: svn://svn.cc65.org/cc65/trunk@2147 b7a2c559-68d2-44c3-8de9-860c34a00d81
---
 libsrc/nes/clock.s | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/libsrc/nes/clock.s b/libsrc/nes/clock.s
index b36735e85..825283c9d 100644
--- a/libsrc/nes/clock.s
+++ b/libsrc/nes/clock.s
@@ -1,6 +1,11 @@
 ;
+; clock.s
+;
 ; Written by Groepaz/Hitmen <groepaz@gmx.net>
 ; Cleanup by Ullrich von Bassewitz <uz@cc65.org>
+; 2003-05-02, Greg King <gngking@erols.com>
+;
+; #include <time.h>
 ;
 ; clock_t clock (void);
 ;
@@ -16,8 +21,10 @@
         ldy    	#0  	    	; High word is always zero
        	sty     sreg+1
        	sty     sreg
-        ldx     tickcount+1    ; ## Problem: Cannot disable ints here
+L1:     ldx     tickcount+1
         lda     tickcount
+        cpx     tickcount+1     ; Did tickcount change?
+        bne     L1              ; Yes, re-read it
        	rts
 
 .endproc
-- 
2.39.5