+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S Y S T E M . G L O B A L _ L O C K S --
--- --
--- B o d y --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1999-2001 Ada Core Technologies, 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 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, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, 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 is maintained by Ada Core Technologies Inc (http://www.gnat.com). --
--- --
-------------------------------------------------------------------------------
-
-with GNAT.Task_Lock;
-
-package body System.Global_Locks is
-
- type String_Access is access String;
-
- package TSL renames GNAT.Task_Lock;
-
- Dir_Separator : Character;
- pragma Import (C, Dir_Separator, "__gnat_dir_separator");
-
- type Lock_File_Entry is
- record
- Dir : String_Access;
- File : String_Access;
- end record;
-
- Last_Lock : Lock_Type := Null_Lock;
- Lock_Table : array (Lock_Type range 1 .. 15) of Lock_File_Entry;
-
- procedure Lock_File
- (Dir : String;
- File : String;
- Wait : Duration := 0.1;
- Retries : Natural := Natural'Last);
- -- Create a lock file File in directory Dir. 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).
-
- ------------------
- -- Acquire_Lock --
- ------------------
-
- procedure Acquire_Lock
- (Lock : in out Lock_Type)
- is
- begin
- Lock_File
- (Lock_Table (Lock).Dir.all,
- Lock_Table (Lock).File.all);
- end Acquire_Lock;
-
- -----------------
- -- Create_Lock --
- -----------------
-
- procedure Create_Lock
- (Lock : out Lock_Type;
- Name : in String)
- is
- L : Lock_Type;
-
- begin
- TSL.Lock;
- Last_Lock := Last_Lock + 1;
- L := Last_Lock;
- TSL.Unlock;
-
- if L > Lock_Table'Last then
- raise Lock_Error;
- end if;
-
- for J in reverse Name'Range loop
- if Name (J) = Dir_Separator then
- Lock_Table (L).Dir
- := new String'(Name (Name'First .. J - 1));
- Lock_Table (L).File
- := new String'(Name (J + 1 .. Name'Last));
- exit;
- end if;
- end loop;
-
- if Lock_Table (L).Dir = null then
- Lock_Table (L).Dir := new String'(".");
- Lock_Table (L).File := new String'(Name);
- end if;
-
- Lock := L;
- end Create_Lock;
-
- ---------------
- -- Lock_File --
- ---------------
-
- procedure Lock_File
- (Dir : String;
- File : String;
- Wait : Duration := 0.1;
- Retries : Natural := Natural'Last)
- is
- C_Dir : aliased String := Dir & ASCII.NUL;
- C_File : aliased String := File & ASCII.NUL;
-
- function Try_Lock (Dir, File : System.Address) return Integer;
- pragma Import (C, Try_Lock, "__gnat_try_lock");
-
- begin
- for I in 0 .. Retries loop
- if Try_Lock (C_Dir'Address, C_File'Address) = 1 then
- return;
- end if;
- exit when I = Retries;
- delay Wait;
- end loop;
- raise Lock_Error;
- end Lock_File;
-
- ------------------
- -- Release_Lock --
- ------------------
-
- procedure Release_Lock
- (Lock : in out Lock_Type)
- is
- S : aliased String :=
- Lock_Table (Lock).Dir.all & Dir_Separator &
- Lock_Table (Lock).File.all & ASCII.NUL;
-
- procedure unlink (A : System.Address);
- pragma Import (C, unlink, "unlink");
-
- begin
- unlink (S'Address);
- end Release_Lock;
-
-end System.Global_Locks;
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