6cbcc54138
* xeinfo.adb: Don't look for revision numbers. * xnmake.adb: Likewise. * xsinfo.adb: Likewise. * xsnames.adb: Likewise. * xtreeprs.adb: Likewise. From-SVN: r50768
114 lines
4.1 KiB
Ada
114 lines
4.1 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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-- --
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-- Copyright (C) 1999-2001 Ada Core Technologies, Inc. --
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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 2, 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. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT is maintained by Ada Core Technologies Inc (http://www.gnat.com). --
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-- --
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------------------------------------------------------------------------------
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-- This implementation is specific to NT.
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with GNAT.Task_Lock;
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with Interfaces.C.Strings;
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with System.OS_Interface;
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package body System.Global_Locks is
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package TSL renames GNAT.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 OSI.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
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(Lock : out Lock_Type;
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Name : in String)
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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, OSI.BOOL (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
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(Lock : in out Lock_Type)
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is
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use type OSI.DWORD;
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Res : OSI.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
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(Lock : in out Lock_Type)
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is
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use type OSI.BOOL;
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Res : OSI.BOOL;
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begin
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Res := OSI.ReleaseMutex (Lock_Table (Lock));
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if Res = OSI.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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