1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . G L O B A L _ L O C K S --
11 -- Copyright (C) 1999-2001 Ada Core Technologies, Inc. --
13 -- GNAT is free software; you can redistribute it and/or modify it under --
14 -- terms of the GNU General Public License as published by the Free Soft- --
15 -- ware Foundation; either version 2, or (at your option) any later ver- --
16 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
17 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
18 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
19 -- for more details. You should have received a copy of the GNU General --
20 -- Public License distributed with GNAT; see file COPYING. If not, write --
21 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
22 -- MA 02111-1307, USA. --
24 -- As a special exception, if other files instantiate generics from this --
25 -- unit, or you link this unit with other files to produce an executable, --
26 -- this unit does not by itself cause the resulting executable to be --
27 -- covered by the GNU General Public License. This exception does not --
28 -- however invalidate any other reasons why the executable file might be --
29 -- covered by the GNU Public License. --
31 -- GNAT is maintained by Ada Core Technologies Inc (http://www.gnat.com). --
33 ------------------------------------------------------------------------------
35 -- This implementation is specific to NT.
39 with Interfaces.C.Strings;
40 with System.OS_Interface;
42 package body System.Global_Locks is
44 package TSL renames GNAT.Task_Lock;
45 package OSI renames System.OS_Interface;
46 package ICS renames Interfaces.C.Strings;
48 subtype Lock_File_Entry is OSI.HANDLE;
50 Last_Lock : Lock_Type := Null_Lock;
51 Lock_Table : array (Lock_Type range 1 .. 15) of Lock_File_Entry;
58 (Lock : out Lock_Type;
65 Last_Lock := Last_Lock + 1;
69 if L > Lock_Table'Last then
74 OSI.CreateMutex (null, OSI.BOOL (False), ICS.New_String (Name));
82 procedure Acquire_Lock
83 (Lock : in out Lock_Type)
89 Res := OSI.WaitForSingleObject (Lock_Table (Lock), OSI.Wait_Infinite);
91 if Res = OSI.WAIT_FAILED then
100 procedure Release_Lock
101 (Lock : in out Lock_Type)
107 Res := OSI.ReleaseMutex (Lock_Table (Lock));
109 if Res = OSI.False then
114 end System.Global_Locks;