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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- S Y S T E M . G L O B A L _ L O C K S --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1999-2010, AdaCore --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This implementation is specific to NT
+
+with System.OS_Interface;
+with System.Task_Lock;
+with System.Win32;
+
+with Interfaces.C.Strings;
+
+package body System.Global_Locks is
+
+ package TSL renames System.Task_Lock;
+ package OSI renames System.OS_Interface;
+ package ICS renames Interfaces.C.Strings;
+
+ subtype Lock_File_Entry is Win32.HANDLE;
+
+ Last_Lock : Lock_Type := Null_Lock;
+ Lock_Table : array (Lock_Type range 1 .. 15) of Lock_File_Entry;
+
+ -----------------
+ -- Create_Lock --
+ -----------------
+
+ procedure Create_Lock (Lock : out Lock_Type; Name : String) is
+ L : Lock_Type;
+
+ begin
+ TSL.Lock;
+ Last_Lock := Last_Lock + 1;
+ L := Last_Lock;
+ TSL.Unlock;
+
+ if L > Lock_Table'Last then
+ raise Lock_Error;
+ end if;
+
+ Lock_Table (L) :=
+ OSI.CreateMutex (null, Win32.FALSE, ICS.New_String (Name));
+ Lock := L;
+ end Create_Lock;
+
+ ------------------
+ -- Acquire_Lock --
+ ------------------
+
+ procedure Acquire_Lock (Lock : in out Lock_Type) is
+ use type Win32.DWORD;
+
+ Res : Win32.DWORD;
+
+ begin
+ Res := OSI.WaitForSingleObject (Lock_Table (Lock), OSI.Wait_Infinite);
+
+ if Res = OSI.WAIT_FAILED then
+ raise Lock_Error;
+ end if;
+ end Acquire_Lock;
+
+ ------------------
+ -- Release_Lock --
+ ------------------
+
+ procedure Release_Lock (Lock : in out Lock_Type) is
+ use type Win32.BOOL;
+
+ Res : Win32.BOOL;
+
+ begin
+ Res := OSI.ReleaseMutex (Lock_Table (Lock));
+
+ if Res = Win32.FALSE then
+ raise Lock_Error;
+ end if;
+ end Release_Lock;
+
+end System.Global_Locks;