File : s-gloloc-mingw.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- S Y S T E M . G L O B A L _ L O C K S --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1999-2010, AdaCore --
10 -- --
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. --
17 -- --
18 -- --
19 -- --
20 -- --
21 -- --
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/>. --
26 -- --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
29 -- --
30 ------------------------------------------------------------------------------
31
32 -- This implementation is specific to NT
33
34 with System.OS_Interface;
35 with System.Task_Lock;
36 with System.Win32;
37
38 with Interfaces.C.Strings;
39
40 package body System.Global_Locks is
41
42 package TSL renames System.Task_Lock;
43 package OSI renames System.OS_Interface;
44 package ICS renames Interfaces.C.Strings;
45
46 subtype Lock_File_Entry is Win32.HANDLE;
47
48 Last_Lock : Lock_Type := Null_Lock;
49 Lock_Table : array (Lock_Type range 1 .. 15) of Lock_File_Entry;
50
51 -----------------
52 -- Create_Lock --
53 -----------------
54
55 procedure Create_Lock (Lock : out Lock_Type; Name : String) is
56 L : Lock_Type;
57
58 begin
59 TSL.Lock;
60 Last_Lock := Last_Lock + 1;
61 L := Last_Lock;
62 TSL.Unlock;
63
64 if L > Lock_Table'Last then
65 raise Lock_Error;
66 end if;
67
68 Lock_Table (L) :=
69 OSI.CreateMutex (null, Win32.FALSE, ICS.New_String (Name));
70 Lock := L;
71 end Create_Lock;
72
73 ------------------
74 -- Acquire_Lock --
75 ------------------
76
77 procedure Acquire_Lock (Lock : in out Lock_Type) is
78 use type Win32.DWORD;
79
80 Res : Win32.DWORD;
81
82 begin
83 Res := OSI.WaitForSingleObject (Lock_Table (Lock), OSI.Wait_Infinite);
84
85 if Res = OSI.WAIT_FAILED then
86 raise Lock_Error;
87 end if;
88 end Acquire_Lock;
89
90 ------------------
91 -- Release_Lock --
92 ------------------
93
94 procedure Release_Lock (Lock : in out Lock_Type) is
95 use type Win32.BOOL;
96
97 Res : Win32.BOOL;
98
99 begin
100 Res := OSI.ReleaseMutex (Lock_Table (Lock));
101
102 if Res = Win32.FALSE then
103 raise Lock_Error;
104 end if;
105 end Release_Lock;
106
107 end System.Global_Locks;