1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- G N A T . L O C K _ F I L E S --
11 -- Copyright (C) 1998-2001 Free Software Foundation, Inc. --
13 -- GNAT is free software; you can redistribute it and/or modify it under --
14 -- terms of the GNU General Public License as published by the Free Soft- --
15 -- ware Foundation; either version 2, or (at your option) any later ver- --
16 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
17 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
18 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
19 -- for more details. You should have received a copy of the GNU General --
20 -- Public License distributed with GNAT; see file COPYING. If not, write --
21 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
22 -- MA 02111-1307, USA. --
24 -- As a special exception, if other files instantiate generics from this --
25 -- unit, or you link this unit with other files to produce an executable, --
26 -- this unit does not by itself cause the resulting executable to be --
27 -- covered by the GNU General Public License. This exception does not --
28 -- however invalidate any other reasons why the executable file might be --
29 -- covered by the GNU Public License. --
31 -- GNAT is maintained by Ada Core Technologies Inc (http://www.gnat.com). --
33 ------------------------------------------------------------------------------
37 package body GNAT.Lock_Files is
39 Dir_Separator : Character;
40 pragma Import (C, Dir_Separator, "__gnat_dir_separator");
48 Lock_File_Name : String;
49 Wait : Duration := 1.0;
50 Retries : Natural := Natural'Last)
52 Dir : aliased String := Directory & ASCII.NUL;
53 File : aliased String := Lock_File_Name & ASCII.NUL;
55 function Try_Lock (Dir, File : System.Address) return Integer;
56 pragma Import (C, Try_Lock, "__gnat_try_lock");
59 for I in 0 .. Retries loop
60 if Try_Lock (Dir'Address, File'Address) = 1 then
63 exit when I = Retries;
74 (Lock_File_Name : String;
75 Wait : Duration := 1.0;
76 Retries : Natural := Natural'Last)
79 for J in reverse Lock_File_Name'Range loop
80 if Lock_File_Name (J) = Dir_Separator then
82 (Lock_File_Name (Lock_File_Name'First .. J - 1),
83 Lock_File_Name (J + 1 .. Lock_File_Name'Last),
90 Lock_File (".", Lock_File_Name, Wait, Retries);
97 procedure Unlock_File (Lock_File_Name : String) is
98 S : aliased String := Lock_File_Name & ASCII.NUL;
100 procedure unlink (A : System.Address);
101 pragma Import (C, unlink, "unlink");
111 procedure Unlock_File (Directory : String; Lock_File_Name : String) is
113 Unlock_File (Directory & Dir_Separator & Lock_File_Name);