From d786ac57d2298415d1f5c6e1ce8ffc41bf42fee8 Mon Sep 17 00:00:00 2001 From: Timo Kreuzer Date: Fri, 1 Jan 2010 12:17:24 +0000 Subject: [PATCH] [HAL] Don't spin with an interlocked operation. svn path=/branches/ros-amd64-bringup/; revision=44849 --- reactos/hal/halx86/generic/cmos.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/reactos/hal/halx86/generic/cmos.c b/reactos/hal/halx86/generic/cmos.c index de5c443de94..abcf18f970a 100644 --- a/reactos/hal/halx86/generic/cmos.c +++ b/reactos/hal/halx86/generic/cmos.c @@ -35,8 +35,9 @@ HalpAcquireSystemHardwareSpinLock(VOID) /* 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 */