From a5728dd37fd61284516c36164231f75c5369a079 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Herv=C3=A9=20Poussineau?= <hpoussin@reactos.org>
Date: Fri, 16 Nov 2007 13:16:43 +0000
Subject: [PATCH] Fix race condition

svn path=/trunk/; revision=30501
---
 reactos/dll/win32/advapi32/sec/misc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/reactos/dll/win32/advapi32/sec/misc.c b/reactos/dll/win32/advapi32/sec/misc.c
index bee74716d49..cac8d84d842 100644
--- a/reactos/dll/win32/advapi32/sec/misc.c
+++ b/reactos/dll/win32/advapi32/sec/misc.c
@@ -69,7 +69,9 @@ CheckNtMartaPresent(VOID)
 {
     DWORD ErrorCode;
 
-    if (NtMarta == NULL)
+    if (InterlockedCompareExchangePointer(&NtMarta,
+                                          NULL,
+                                          NULL) == NULL)
     {
         /* we're the first one trying to use ntmarta, initialize it and change
            the pointer after initialization */