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Diffstat (limited to 'gcc/ada/s-gloloc.ads')
| -rw-r--r-- | gcc/ada/s-gloloc.ads | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/gcc/ada/s-gloloc.ads b/gcc/ada/s-gloloc.ads new file mode 100644 index 00000000000..3129044bbf9 --- /dev/null +++ b/gcc/ada/s-gloloc.ads @@ -0,0 +1,69 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S Y S T E M . G L O B A L _ L O C K S -- +-- -- +-- S p e c -- +-- -- +-- $Revision: 1.3 $ +-- -- +-- 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). -- +-- -- +------------------------------------------------------------------------------ + + -- This package contains the necessary routines to provide + -- reliable system wide locking capability. + +package System.Global_Locks is + + Lock_Error : exception; + -- Exception raised if a request cannot be executed on a lock. + + type Lock_Type is private; + -- Such a lock is a global lock between partitions. This lock is + -- uniquely defined between the partitions because of its name. + + Null_Lock : constant Lock_Type; + + procedure Create_Lock + (Lock : out Lock_Type; + Name : in String); + -- Create or retrieve a global lock for the current partition using + -- its Name. + + procedure Acquire_Lock + (Lock : in out Lock_Type); + -- If the lock cannot be acquired because someone already owns it, this + -- procedure is supposed to wait and retry forever. + + procedure Release_Lock + (Lock : in out Lock_Type); + +private + + type Lock_Type is new Natural; + + Null_Lock : constant Lock_Type := 0; + +end System.Global_Locks; |