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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- G N A T . L O C K _ F I L E S --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1995-2005, AdaCore --
+-- --
+-- 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 2, 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. See the GNU General Public License --
+-- for more details. You should have received a copy of the GNU General --
+-- Public License distributed with GNAT; see file COPYING. If not, write --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
+-- --
+-- As a special exception, if other files instantiate generics from this --
+-- unit, or you link this unit with other files to produce an executable, --
+-- this unit does not by itself cause the resulting executable to be --
+-- covered by the GNU General Public License. This exception does not --
+-- however invalidate any other reasons why the executable file might be --
+-- covered by the GNU Public License. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This package contains the necessary routines for using files for the
+-- purpose of providing realiable system wide locking capability.
+
+package GNAT.Lock_Files is
+ pragma Preelaborate;
+
+ Lock_Error : exception;
+ -- Exception raised if file cannot be locked
+
+ subtype Path_Name is String;
+ -- Pathname is used by all services provided in this unit to specified
+ -- directory name and file name. On DOS based systems both directory
+ -- separators are handled (i.e. slash and backslash).
+
+ procedure Lock_File
+ (Directory : Path_Name;
+ Lock_File_Name : Path_Name;
+ Wait : Duration := 1.0;
+ Retries : Natural := Natural'Last);
+ -- Create a lock file Lock_File_Name in directory Directory. If the file
+ -- cannot be locked because someone already owns the lock, this procedure
+ -- waits Wait seconds and retries at most Retries times. If the file
+ -- still cannot be locked, Lock_Error is raised. The default is to try
+ -- every second, almost forever (Natural'Last times). The full path of
+ -- the file is constructed by concatenating Directory and Lock_File_Name.
+ -- Directory can optionally terminate with a directory separator.
+
+ procedure Lock_File
+ (Lock_File_Name : Path_Name;
+ Wait : Duration := 1.0;
+ Retries : Natural := Natural'Last);
+ -- See above. The full lock file path is given as one string
+
+ procedure Unlock_File (Directory : Path_Name; Lock_File_Name : Path_Name);
+ -- Unlock a file. Directory can optionally terminate with a directory
+ -- separator.
+
+ procedure Unlock_File (Lock_File_Name : Path_Name);
+ -- Unlock a file whose full path is given in Lock_File_Name
+
+end GNAT.Lock_Files;