[hpoussin] 30501: Fix race condition

Author: hpoussin
Date: Fri Nov 16 16:16:43 2007
New Revision: 30501

URL: http://svn.reactos.org/svn/reactos?rev=30501&view=rev
Log:
Fix race condition

Modified:
    trunk/reactos/dll/win32/advapi32/sec/misc.c

Modified: trunk/reactos/dll/win32/advapi32/sec/misc.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/dll/win32/advapi32/sec/misc...
==============================================================================
--- trunk/reactos/dll/win32/advapi32/sec/misc.c (original)
+++ trunk/reactos/dll/win32/advapi32/sec/misc.c Fri Nov 16 16:16:43 2007
@@ -69,7 +69,9 @@
 {
     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 */