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108 | ------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . T A S K _ T E R M I N A T I O N --
-- --
-- B o d y --
-- --
-- Copyright (C) 2005-2023, Free Software Foundation, 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 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/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This is a simplified version of this package body to be used in when the
-- Ravenscar profile and there are no exception handlers present (either of
-- the restrictions No_Exception_Handlers or No_Exception_Propagation are in
-- effect). This means that the only task termination cause that need to be
-- taken into account is normal task termination (abort is not allowed by
-- the Ravenscar profile and the restricted exception support does not
-- include Exception_Occurrence).
with System.Tasking;
-- used for Task_Id
-- Self
-- Fall_Back_Handler
with System.Task_Primitives.Operations;
-- Used for Self
-- Set_Priority
-- Get_Priority
with Ada.Unchecked_Conversion;
package body Ada.Task_Termination is
use System.Task_Primitives.Operations;
function To_TT is new Ada.Unchecked_Conversion
(System.Tasking.Termination_Handler, Termination_Handler);
function To_ST is new Ada.Unchecked_Conversion
(Termination_Handler, System.Tasking.Termination_Handler);
-----------------------------------
-- Current_Task_Fallback_Handler --
-----------------------------------
function Current_Task_Fallback_Handler return Termination_Handler is
Self_Id : constant System.Tasking.Task_Id := Self;
Caller_Priority : constant System.Any_Priority := Get_Priority (Self_Id);
Result : Termination_Handler;
begin
-- Raise the priority to prevent race conditions when modifying
-- System.Tasking.Fall_Back_Handler.
Set_Priority (Self_Id, System.Any_Priority'Last);
Result := To_TT (System.Tasking.Fall_Back_Handler);
-- Restore the original priority
Set_Priority (Self_Id, Caller_Priority);
return Result;
end Current_Task_Fallback_Handler;
-------------------------------------
-- Set_Dependents_Fallback_Handler --
-------------------------------------
procedure Set_Dependents_Fallback_Handler (Handler : Termination_Handler) is
Self_Id : constant System.Tasking.Task_Id := Self;
Caller_Priority : constant System.Any_Priority := Get_Priority (Self_Id);
begin
-- Raise the priority to prevent race conditions when modifying
-- System.Tasking.Fall_Back_Handler.
Set_Priority (Self_Id, System.Any_Priority'Last);
System.Tasking.Fall_Back_Handler := To_ST (Handler);
-- Restore the original priority
Set_Priority (Self_Id, Caller_Priority);
end Set_Dependents_Fallback_Handler;
end Ada.Task_Termination;
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