108 lines
3.9 KiB
Ada
108 lines
3.9 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S Y S T E M . G L O B A L _ L O C K S --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1999-2010, AdaCore --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This implementation is specific to NT
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with System.OS_Interface;
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with System.Task_Lock;
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with System.Win32;
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with Interfaces.C.Strings;
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package body System.Global_Locks is
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package TSL renames System.Task_Lock;
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package OSI renames System.OS_Interface;
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package ICS renames Interfaces.C.Strings;
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subtype Lock_File_Entry is Win32.HANDLE;
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Last_Lock : Lock_Type := Null_Lock;
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Lock_Table : array (Lock_Type range 1 .. 15) of Lock_File_Entry;
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-----------------
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-- Create_Lock --
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-----------------
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procedure Create_Lock (Lock : out Lock_Type; Name : String) is
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L : Lock_Type;
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begin
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TSL.Lock;
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Last_Lock := Last_Lock + 1;
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L := Last_Lock;
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TSL.Unlock;
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if L > Lock_Table'Last then
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raise Lock_Error;
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end if;
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Lock_Table (L) :=
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OSI.CreateMutex (null, Win32.FALSE, ICS.New_String (Name));
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Lock := L;
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end Create_Lock;
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------------------
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-- Acquire_Lock --
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------------------
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procedure Acquire_Lock (Lock : in out Lock_Type) is
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use type Win32.DWORD;
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Res : Win32.DWORD;
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begin
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Res := OSI.WaitForSingleObject (Lock_Table (Lock), OSI.Wait_Infinite);
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if Res = OSI.WAIT_FAILED then
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raise Lock_Error;
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end if;
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end Acquire_Lock;
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------------------
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-- Release_Lock --
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------------------
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procedure Release_Lock (Lock : in out Lock_Type) is
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use type Win32.BOOL;
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Res : Win32.BOOL;
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begin
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Res := OSI.ReleaseMutex (Lock_Table (Lock));
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if Res = Win32.FALSE then
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raise Lock_Error;
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end if;
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end Release_Lock;
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end System.Global_Locks;
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