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------------------------------------------------------------------------------

--                                                                          --

--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --

--                                                                          --

--                  SYSTEM.TASK_PRIMITIVES.OPERATIONS.DEC                   --

--                                                                          --

--                                  B o d y                                 --

--                                                                          --

--          Copyright (C) 2000-2009, Free Software Foundation, Inc.         --

--                                                                          --

-- 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 3,  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.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNARL was developed by the GNARL team at Florida State University.       --

-- Extensive contributions were provided by Ada Core Technologies, Inc.     --

--                                                                          --

------------------------------------------------------------------------------

--   This package is for OpenVMS/Alpha

with System.OS_Interface;

with System.Parameters;

with System.Tasking;

with Ada.Unchecked_Conversion;

with System.Soft_Links;

package body System.Task_Primitives.Operations.DEC is

   use System.OS_Interface;

   use System.Parameters;

   use System.Tasking;

   use System.Aux_DEC;

   use type Interfaces.C.int;

   package SSL renames System.Soft_Links;

   --  The FAB_RAB_Type specifies where the context field (the calling

   --  task) is stored.  Other fields defined for FAB_RAB arent' need and

   --  so are ignored.

   type FAB_RAB_Type is record

      CTX : Unsigned_Longword;

   end record;

   for FAB_RAB_Type use record

      CTX at 24 range 0 .. 31;

   end record;

   for FAB_RAB_Type'Size use 224;

   type FAB_RAB_Access_Type is access all FAB_RAB_Type;

   -----------------------

   -- Local Subprograms --

   -----------------------

   function To_Unsigned_Longword is new

     Ada.Unchecked_Conversion (Task_Id, Unsigned_Longword);

   function To_Task_Id is new

     Ada.Unchecked_Conversion (Unsigned_Longword, Task_Id);

   function To_FAB_RAB is new

     Ada.Unchecked_Conversion (Address, FAB_RAB_Access_Type);

   ---------------------------

   -- Interrupt_AST_Handler --

   ---------------------------

   procedure Interrupt_AST_Handler (ID : Address) is

      Result      : Interfaces.C.int;

      AST_Self_ID : constant Task_Id := To_Task_Id (ID);

   begin

      Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);

      pragma Assert (Result = 0);

   end Interrupt_AST_Handler;

   ---------------------

   -- RMS_AST_Handler --

   ---------------------

   procedure RMS_AST_Handler (ID : Address) is

      AST_Self_ID : constant Task_Id := To_Task_Id (To_FAB_RAB (ID).CTX);

      Result      : Interfaces.C.int;

   begin

      AST_Self_ID.Common.LL.AST_Pending := False;

      Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);

      pragma Assert (Result = 0);

   end RMS_AST_Handler;

   ----------

   -- Self --

   ----------

   function Self return Unsigned_Longword is

      Self_ID : constant Task_Id := Self;

   begin

      Self_ID.Common.LL.AST_Pending := True;

      return To_Unsigned_Longword (Self);

   end Self;

   -------------------------

   -- Starlet_AST_Handler --

   -------------------------

   procedure Starlet_AST_Handler (ID : Address) is

      Result      : Interfaces.C.int;

      AST_Self_ID : constant Task_Id := To_Task_Id (ID);

   begin

      AST_Self_ID.Common.LL.AST_Pending := False;

      Result := pthread_cond_signal_int_np (AST_Self_ID.Common.LL.CV'Access);

      pragma Assert (Result = 0);

   end Starlet_AST_Handler;

   ----------------

   -- Task_Synch --

   ----------------

   procedure Task_Synch is

      Synch_Self_ID : constant Task_Id := Self;

   begin

      if Single_Lock then

         Lock_RTS;

      else

         Write_Lock (Synch_Self_ID);

      end if;

      SSL.Abort_Defer.all;

      Synch_Self_ID.Common.State := AST_Server_Sleep;

      while Synch_Self_ID.Common.LL.AST_Pending loop

         Sleep (Synch_Self_ID, AST_Server_Sleep);

      end loop;

      Synch_Self_ID.Common.State := Runnable;

      if Single_Lock then

         Unlock_RTS;

      else

         Unlock (Synch_Self_ID);

      end if;

      SSL.Abort_Undefer.all;

   end Task_Synch;

end System.Task_Primitives.Operations.DEC;