New Language: Ada

From-SVN: r45957

1 files changed, 127 insertions, 0 deletions

diff --git a/gcc/ada/s-taprob.adb b/gcc/ada/s-taprob.adb
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+------------------------------------------------------------------------------
+--                                                                          --
+--                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
+--                                                                          --
+--      S Y S T E M . T A S K I N G . P R O T E C T E D _ O B J E C T S     --
+--                                                                          --
+--                                  B o d y                                 --
+--                                                                          --
+--                             $Revision: 1.79 $
+--                                                                          --
+--             Copyright (C) 1991-2001 Florida State University             --
+--                                                                          --
+-- GNARL 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. GNARL 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 GNARL; 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.                                      --
+--                                                                          --
+-- GNARL was developed by the GNARL team at Florida State University. It is --
+-- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
+-- State University (http://www.gnat.com).                                  --
+--                                                                          --
+------------------------------------------------------------------------------
+
+pragma Polling (Off);
+--  Turn off polling, we do not want ATC polling to take place during
+--  tasking operations. It causes infinite loops and other problems.
+
+with System.Task_Primitives.Operations;
+--  used for Write_Lock
+--           Unlock
+
+with Ada.Exceptions;
+--  used for Raise_Exception
+
+package body System.Tasking.Protected_Objects is
+
+   use Ada.Exceptions;
+   use System.Task_Primitives.Operations;
+
+   -------------------------
+   -- Finalize_Protection --
+   -------------------------
+
+   procedure Finalize_Protection (Object : in out Protection) is
+   begin
+      Finalize_Lock (Object.L'Unrestricted_Access);
+   end Finalize_Protection;
+
+   ---------------------------
+   -- Initialize_Protection --
+   ---------------------------
+
+   procedure Initialize_Protection
+     (Object           : Protection_Access;
+      Ceiling_Priority : Integer)
+   is
+      Init_Priority : Integer := Ceiling_Priority;
+   begin
+      if Init_Priority = Unspecified_Priority then
+         Init_Priority  := System.Priority'Last;
+      end if;
+
+      Initialize_Lock (Init_Priority, Object.L'Access);
+      Object.Ceiling := System.Any_Priority (Init_Priority);
+   end Initialize_Protection;
+
+   ----------
+   -- Lock --
+   ----------
+
+   procedure Lock (Object : Protection_Access) is
+      Ceiling_Violation : Boolean;
+   begin
+      --  The lock is made without defering abortion.
+
+      --  Therefore the abortion has to be deferred before calling this
+      --  routine. This means that the compiler has to generate a Defer_Abort
+      --  call before the call to Lock.
+
+      --  The caller is responsible for undeferring abortion, and compiler
+      --  generated calls must be protected with cleanup handlers to ensure
+      --  that abortion is undeferred in all cases.
+
+      Write_Lock (Object.L'Access, Ceiling_Violation);
+
+      if Ceiling_Violation then
+         Raise_Exception (Program_Error'Identity, "Ceiling Violation");
+      end if;
+   end Lock;
+
+   --------------------
+   -- Lock_Read_Only --
+   --------------------
+
+   procedure Lock_Read_Only (Object : Protection_Access) is
+      Ceiling_Violation : Boolean;
+   begin
+      Read_Lock (Object.L'Access, Ceiling_Violation);
+
+      if Ceiling_Violation then
+         Raise_Exception (Program_Error'Identity, "Ceiling Violation");
+      end if;
+   end Lock_Read_Only;
+
+   ------------
+   -- Unlock --
+   ------------
+
+   procedure Unlock (Object : Protection_Access) is
+   begin
+      Unlock (Object.L'Access);
+   end Unlock;
+
+end System.Tasking.Protected_Objects;