------------------------------------------------------------------------------ -- -- -- 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) 1999-2001 Ada Core Technologies, Inc. -- -- -- -- 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 2, 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. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNAT; see file COPYING. If not, write -- -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, USA. -- -- -- -- As a special exception, if other files instantiate generics from this -- -- unit, or you link this unit with other files to produce an executable, -- -- this unit does not by itself cause the resulting executable to be -- -- covered by the GNU General Public License. This exception does not -- -- however invalidate any other reasons why the executable file might be -- -- covered by the GNU Public License. -- -- -- -- GNAT is maintained by Ada Core Technologies Inc (http://www.gnat.com). -- -- -- ------------------------------------------------------------------------------ -- This implementation is specific to NT. with GNAT.Task_Lock; with Interfaces.C.Strings; with System.OS_Interface; package body System.Global_Locks is package TSL renames GNAT.Task_Lock; package OSI renames System.OS_Interface; package ICS renames Interfaces.C.Strings; subtype Lock_File_Entry is OSI.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 : in 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, OSI.BOOL (False), ICS.New_String (Name)); Lock := L; end Create_Lock; ------------------ -- Acquire_Lock -- ------------------ procedure Acquire_Lock (Lock : in out Lock_Type) is use type OSI.DWORD; Res : OSI.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 OSI.BOOL; Res : OSI.BOOL; begin Res := OSI.ReleaseMutex (Lock_Table (Lock)); if Res = OSI.False then raise Lock_Error; end if; end Release_Lock; end System.Global_Locks;