1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . G L O B A L _ L O C K S --
9 -- Copyright (C) 1999-2010, AdaCore --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
32 -- This implementation is specific to NT
34 with System.OS_Interface;
35 with System.Task_Lock;
38 with Interfaces.C.Strings;
40 package body System.Global_Locks is
42 package TSL renames System.Task_Lock;
43 package OSI renames System.OS_Interface;
44 package ICS renames Interfaces.C.Strings;
46 subtype Lock_File_Entry is Win32.HANDLE;
48 Last_Lock : Lock_Type := Null_Lock;
49 Lock_Table : array (Lock_Type range 1 .. 15) of Lock_File_Entry;
55 procedure Create_Lock (Lock : out Lock_Type; Name : String) is
60 Last_Lock := Last_Lock + 1;
64 if L > Lock_Table'Last then
69 OSI.CreateMutex (null, Win32.FALSE, ICS.New_String (Name));
77 procedure Acquire_Lock (Lock : in out Lock_Type) is
83 Res := OSI.WaitForSingleObject (Lock_Table (Lock), OSI.Wait_Infinite);
85 if Res = OSI.WAIT_FAILED then
94 procedure Release_Lock (Lock : in out Lock_Type) is
100 Res := OSI.ReleaseMutex (Lock_Table (Lock));
102 if Res = Win32.FALSE then
107 end System.Global_Locks;