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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- G N A T . L O C K _ F I L E S --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1998-2009, Free Software Foundation, Inc. --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+with System;
+
+package body GNAT.Lock_Files is
+
+ Dir_Separator : Character;
+ pragma Import (C, Dir_Separator, "__gnat_dir_separator");
+
+ ---------------
+ -- Lock_File --
+ ---------------
+
+ procedure Lock_File
+ (Directory : Path_Name;
+ Lock_File_Name : Path_Name;
+ Wait : Duration := 1.0;
+ Retries : Natural := Natural'Last)
+ is
+ Dir : aliased String := Directory & ASCII.NUL;
+ File : aliased String := Lock_File_Name & ASCII.NUL;
+
+ function Try_Lock (Dir, File : System.Address) return Integer;
+ pragma Import (C, Try_Lock, "__gnat_try_lock");
+
+ begin
+ -- If a directory separator was provided, just remove the one we have
+ -- added above.
+
+ if Directory (Directory'Last) = Dir_Separator
+ or else Directory (Directory'Last) = '/'
+ then
+ Dir (Dir'Last - 1) := ASCII.NUL;
+ end if;
+
+ -- Try to lock the file Retries times
+
+ for I in 0 .. Retries loop
+ if Try_Lock (Dir'Address, File'Address) = 1 then
+ return;
+ end if;
+
+ exit when I = Retries;
+ delay Wait;
+ end loop;
+
+ raise Lock_Error;
+ end Lock_File;
+
+ ---------------
+ -- Lock_File --
+ ---------------
+
+ procedure Lock_File
+ (Lock_File_Name : Path_Name;
+ Wait : Duration := 1.0;
+ Retries : Natural := Natural'Last)
+ is
+ begin
+ for J in reverse Lock_File_Name'Range loop
+ if Lock_File_Name (J) = Dir_Separator
+ or else Lock_File_Name (J) = '/'
+ then
+ Lock_File
+ (Lock_File_Name (Lock_File_Name'First .. J - 1),
+ Lock_File_Name (J + 1 .. Lock_File_Name'Last),
+ Wait,
+ Retries);
+ return;
+ end if;
+ end loop;
+
+ Lock_File (".", Lock_File_Name, Wait, Retries);
+ end Lock_File;
+
+ -----------------
+ -- Unlock_File --
+ -----------------
+
+ procedure Unlock_File (Lock_File_Name : Path_Name) is
+ S : aliased String := Lock_File_Name & ASCII.NUL;
+
+ procedure unlink (A : System.Address);
+ pragma Import (C, unlink, "unlink");
+
+ begin
+ unlink (S'Address);
+ end Unlock_File;
+
+ -----------------
+ -- Unlock_File --
+ -----------------
+
+ procedure Unlock_File (Directory : Path_Name; Lock_File_Name : Path_Name) is
+ begin
+ if Directory (Directory'Last) = Dir_Separator
+ or else Directory (Directory'Last) = '/'
+ then
+ Unlock_File (Directory & Lock_File_Name);
+ else
+ Unlock_File (Directory & Dir_Separator & Lock_File_Name);
+ end if;
+ end Unlock_File;
+
+end GNAT.Lock_Files;