58 lines
3.1 KiB
Ada
58 lines
3.1 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- A D A . D I S P A T C H I N G --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 2015, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Ada.Exceptions;
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with System.Tasking;
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with System.Task_Primitives.Operations;
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package body Ada.Dispatching is
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procedure Yield is
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Self_Id : constant System.Tasking.Task_Id :=
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System.Task_Primitives.Operations.Self;
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begin
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-- If pragma Detect_Blocking is active, Program_Error must be
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-- raised if this potentially blocking operation is called from a
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-- protected action.
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if System.Tasking.Detect_Blocking
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and then Self_Id.Common.Protected_Action_Nesting > 0
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then
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Ada.Exceptions.Raise_Exception
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(Program_Error'Identity, "potentially blocking operation");
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else
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System.Task_Primitives.Operations.Yield;
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end if;
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end Yield;
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end Ada.Dispatching;
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