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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) 1999-2001 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;
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