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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . D I S P A T C H I N G --
-- --
-- B o d y --
-- --
-- Copyright (C) 2015, 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. --
-- --
------------------------------------------------------------------------------
with Ada.Exceptions;
with System.Tasking;
with System.Task_Primitives.Operations;
package body Ada.Dispatching is
procedure Yield is
Self_Id : constant System.Tasking.Task_Id :=
System.Task_Primitives.Operations.Self;
begin
-- If pragma Detect_Blocking is active, Program_Error must be
-- raised if this potentially blocking operation is called from a
-- protected action.
if System.Tasking.Detect_Blocking
and then Self_Id.Common.Protected_Action_Nesting > 0
then
Ada.Exceptions.Raise_Exception
(Program_Error'Identity, "potentially blocking operation");
else
System.Task_Primitives.Operations.Yield;
end if;
end Yield;
end Ada.Dispatching;