Fix refcounting, use Interlocked functions.

dlls/msi/handle.c

@@ -157,7 +157,7 @@ void msiobj_addref( MSIOBJECTHDR *info )
         return;
     }
 
-    info->refcount++;
+    InterlockedIncrement(&info->refcount);
 }
 
 void msiobj_lock( MSIOBJECTHDR *info )
@@ -185,8 +185,8 @@ int msiobj_release( MSIOBJECTHDR *info )
         return -1;
     }
 
-    ret = info->refcount--;
-    if (info->refcount == 0)
+    ret = InterlockedDecrement( &info->refcount );
+    if( ret==0 )
     {
         if( info->destructor )
             info->destructor( info );

dlls/msi/msi.c

@@ -228,9 +228,12 @@ BOOL encode_base85_guid( GUID *guid, LPWSTR str )
 VOID MSI_CloseDatabase( MSIOBJECTHDR *arg )
 {
     MSIDATABASE *db = (MSIDATABASE *) arg;
+    DWORD r;
 
     free_cached_tables( db );
-    IStorage_Release( db->storage );
+    r = IStorage_Release( db->storage );
+    if( r )
+        ERR("database reference count was not zero (%ld)\n", r);
 }
 
 UINT MSI_OpenDatabaseW(LPCWSTR szDBPath, LPCWSTR szPersist, MSIDATABASE **pdb)

dlls/msi/msipriv.h

@@ -53,7 +53,7 @@ struct tagMSIOBJECTHDR
 {
     UINT magic;
     UINT type;
-    UINT refcount;
+    DWORD refcount;
     msihandledestructor destructor;
     struct tagMSIOBJECTHDR *next;
     struct tagMSIOBJECTHDR *prev;

dlls/msi/msiquery.c

@@ -461,6 +461,8 @@ UINT WINAPI MsiDatabaseCommit( MSIHANDLE hdb )
 
     /* FIXME: unlock the database */
 
+    msiobj_release( &db->hdr );
+
     return r;
 }