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) 1999-2008, 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 2, 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 -- This implementation is specific to NT
36 with System
.OS_Interface
;
37 with System
.Task_Lock
;
40 with Interfaces
.C
.Strings
;
42 package body System
.Global_Locks
is
44 package TSL
renames System
.Task_Lock
;
45 package OSI
renames System
.OS_Interface
;
46 package ICS
renames Interfaces
.C
.Strings
;
48 subtype Lock_File_Entry
is Win32
.HANDLE
;
50 Last_Lock
: Lock_Type
:= Null_Lock
;
51 Lock_Table
: array (Lock_Type
range 1 .. 15) of Lock_File_Entry
;
57 procedure Create_Lock
(Lock
: out Lock_Type
; Name
: String) is
62 Last_Lock
:= Last_Lock
+ 1;
66 if L
> Lock_Table
'Last then
71 OSI
.CreateMutex
(null, Win32
.FALSE, ICS
.New_String
(Name
));
79 procedure Acquire_Lock
(Lock
: in out Lock_Type
) is
85 Res
:= OSI
.WaitForSingleObject
(Lock_Table
(Lock
), OSI
.Wait_Infinite
);
87 if Res
= OSI
.WAIT_FAILED
then
96 procedure Release_Lock
(Lock
: in out Lock_Type
) is
102 Res
:= OSI
.ReleaseMutex
(Lock_Table
(Lock
));
104 if Res
= Win32
.FALSE then
109 end System
.Global_Locks
;