Piotr Caban : msvcr100: Use InterlockedDecrement in SpinWait::_SpinOnce.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: a6bfecd4019ec9869d51d296c48e9250ebbed3e6
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=a6bfecd4019ec9869d51d296c48e9250ebbed3e6

Author: Piotr Caban <piotr at codeweavers.com>
Date:   Tue Feb 28 11:21:34 2017 +0100

msvcr100: Use InterlockedDecrement in SpinWait::_SpinOnce.

Signed-off-by: Piotr Caban <piotr at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/msvcrt/lock.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/dlls/msvcrt/lock.c b/dlls/msvcrt/lock.c
index 3153ae1..f4c44170 100644
--- a/dlls/msvcrt/lock.c
+++ b/dlls/msvcrt/lock.c
@@ -265,13 +265,7 @@ MSVCRT_bool __thiscall SpinWait__SpinOnce(SpinWait *this)
         SpinWait__Reset(this);
         /* fall through */
     case SPINWAIT_SPIN:
-#ifdef __i386__
-        __asm__ __volatile__( "rep;nop" : : : "memory" );
-#else
-        __asm__ __volatile__( "" : : : "memory" );
-#endif
-
-        this->spin--;
+        InterlockedDecrement((LONG*)&this->spin);
         if(!this->spin)
             this->state = this->unknown ? SPINWAIT_YIELD : SPINWAIT_DONE;
         return TRUE;