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) 1999-2001 Ada Core Technologies, Inc. -- 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 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, 59 Temple Place - Suite 330, Boston, -- 20-- MA 02111-1307, USA. -- 21-- -- 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. -- 28-- -- 29-- GNAT was originally developed by the GNAT team at New York University. -- 30-- Extensive contributions were provided by Ada Core Technologies Inc. -- 31-- -- 32------------------------------------------------------------------------------ 33 34-- This implementation is specific to NT. 35 36with GNAT.Task_Lock; 37 38with Interfaces.C.Strings; 39with System.OS_Interface; 40 41package body System.Global_Locks is 42 43 package TSL renames GNAT.Task_Lock; 44 package OSI renames System.OS_Interface; 45 package ICS renames Interfaces.C.Strings; 46 47 subtype Lock_File_Entry is OSI.HANDLE; 48 49 Last_Lock : Lock_Type := Null_Lock; 50 Lock_Table : array (Lock_Type range 1 .. 15) of Lock_File_Entry; 51 52 ----------------- 53 -- Create_Lock -- 54 ----------------- 55 56 procedure Create_Lock 57 (Lock : out Lock_Type; 58 Name : in String) 59 is 60 L : Lock_Type; 61 62 begin 63 TSL.Lock; 64 Last_Lock := Last_Lock + 1; 65 L := Last_Lock; 66 TSL.Unlock; 67 68 if L > Lock_Table'Last then 69 raise Lock_Error; 70 end if; 71 72 Lock_Table (L) := 73 OSI.CreateMutex (null, OSI.BOOL (False), ICS.New_String (Name)); 74 Lock := L; 75 end Create_Lock; 76 77 ------------------ 78 -- Acquire_Lock -- 79 ------------------ 80 81 procedure Acquire_Lock 82 (Lock : in out Lock_Type) 83 is 84 use type OSI.DWORD; 85 86 Res : OSI.DWORD; 87 begin 88 Res := OSI.WaitForSingleObject (Lock_Table (Lock), OSI.Wait_Infinite); 89 90 if Res = OSI.WAIT_FAILED then 91 raise Lock_Error; 92 end if; 93 end Acquire_Lock; 94 95 ------------------ 96 -- Release_Lock -- 97 ------------------ 98 99 procedure Release_Lock 100 (Lock : in out Lock_Type) 101 is 102 use type OSI.BOOL; 103 104 Res : OSI.BOOL; 105 begin 106 Res := OSI.ReleaseMutex (Lock_Table (Lock)); 107 108 if Res = OSI.False then 109 raise Lock_Error; 110 end if; 111 end Release_Lock; 112 113end System.Global_Locks; 114