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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . T A S K _ P R I M I T I V E S . O P E R A T I O N S . --
-- D E C --
-- --
-- B o d y --
-- --
-- Copyright (C) 2000-2005 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 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, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, 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. --
-- 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 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 --
-----------------------
pragma Warnings (Off);
-- Task_Id is 64 bits wide (but only 32 bits significant) on Integrity/VMS
function To_Unsigned_Longword is new
Unchecked_Conversion (Task_Id, Unsigned_Longword);
function To_Task_Id is new
Unchecked_Conversion (Unsigned_Longword, Task_Id);
pragma Warnings (On);
function To_FAB_RAB is new
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;
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