[tkreuzer] 44849: [HAL] Don't spin with an interlocked operation.

Author: tkreuzer
Date: Fri Jan  1 13:17:24 2010
New Revision: 44849

URL: http://svn.reactos.org/svn/reactos?rev=44849&view=rev
Log:
[HAL]
Don't spin with an interlocked operation.

Modified:
    branches/ros-amd64-bringup/reactos/hal/halx86/generic/cmos.c

Modified: branches/ros-amd64-bringup/reactos/hal/halx86/generic/cmos.c
URL: http://svn.reactos.org/svn/reactos/branches/ros-amd64-bringup/reactos/hal/ha...
==============================================================================
--- branches/ros-amd64-bringup/reactos/hal/halx86/generic/cmos.c [iso-8859-1] (original)
+++ branches/ros-amd64-bringup/reactos/hal/halx86/generic/cmos.c [iso-8859-1] Fri Jan  1 13:17:24 2010
@@ -35,8 +35,9 @@
     /* Try to acquire the lock */
     while (InterlockedBitTestAndSet((PLONG)&HalpSystemHardwareLock, 0))
     {
-        /* Lock is held, short wait and try again */
-        YieldProcessor();
+        /* Lock is held, spin until it's free */
+        while (*(volatile ULONG*)HalpSystemHardwareLock & 1)
+            YieldProcessor();
     }

/* We have the lock, save the flags now */