update for HEAD-2003091401

[reactos.git] / subsys / win32k / ntuser / winlock.c

diff --git a/subsys/win32k/ntuser/winlock.c b/subsys/win32k/ntuser/winlock.c
new file mode 100644 (file)
index 0000000..225e56c
--- /dev/null
+++ b/subsys/win32k/ntuser/winlock.c
@@ -0,0 +1,123 @@
+/*
+ *  ReactOS W32 Subsystem
+ *  Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 ReactOS Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/*
+ *
+ * COPYRIGHT:        See COPYING in the top level directory
+ * PROJECT:          ReactOS kernel
+ * PURPOSE:          Windows++ locking
+ * FILE:             subsys/win32k/ntuser/winlock.c
+ * PROGRAMER:        Gunnar
+ * REVISION HISTORY:
+ *
+ */
+/* INCLUDES ******************************************************************/
+
+#include <ddk/ntddk.h>
+#include <win32k/win32k.h>
+#include <include/object.h>
+#include <include/guicheck.h>
+#include <include/window.h>
+#include <include/class.h>
+#include <include/error.h>
+#include <include/winsta.h>
+#include <include/winpos.h>
+#include <include/callback.h>
+#include <include/msgqueue.h>
+#include <include/rect.h>
+
+#define NDEBUG
+#include <win32k/debug1.h>
+#include <debug.h>
+
+/* GLOBALS *****************************************************************/
+
+static ERESOURCE WinLock;
+
+/* FUNCTIONS *****************************************************************/
+
+BOOL FASTCALL IntVerifyWinLock(WINLOCK_TYPE Type)
+{
+  switch (Type)
+  {
+    case None:
+      return !ExIsResourceAcquiredSharedLite(&WinLock);
+    case Shared: /* NOTE: an exclusive lock is also a shared lock */
+    case Any: 
+      return ExIsResourceAcquiredSharedLite(&WinLock);
+    case Exclusive:
+      return ExIsResourceAcquiredExclusiveLite(&WinLock);
+  }
+
+  KEBUGCHECK(0);
+  return FALSE;
+}
+
+WINLOCK_TYPE FASTCALL IntSuspendWinLock()
+{
+  ASSERT_WINLOCK(Any);
+
+  if (ExIsResourceAcquiredExclusiveLite(&WinLock)) return Exclusive;
+  
+  return Shared;
+}
+
+VOID FASTCALL IntRestoreWinLock(WINLOCK_TYPE Type)
+{
+  switch (Type)
+  {
+    case Exclusive:
+      return IntAcquireWinLockExclusive(&WinLock);
+    case Shared:
+      return IntAcquireWinLockShared(&WinLock);
+    /* silence warnings */
+    case None:
+    case Any:
+      break;
+  }
+
+  KEBUGCHECK(0);
+}
+
+inline VOID IntAcquireWinLockShared()
+{
+  ExAcquireResourceExclusiveLite(&WinLock, TRUE /*Wait*/ );
+}
+
+inline VOID IntAcquireWinLockExclusive()
+{
+  ExAcquireResourceSharedLite(&WinLock, TRUE /*Wait*/  );
+}
+
+inline VOID IntReleaseWinLock()
+{
+  ExReleaseResourceLite(&WinLock ); 
+}
+
+inline BOOL IntInitializeWinLock()
+{
+  ExInitializeResourceLite(&WinLock );
+  return TRUE;
+}
+
+inline VOID IntDeleteWinLock()
+{
+  ExDeleteResourceLite(&WinLock );  
+}
+
+/* EOF */