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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;
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