| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- A D A . D I S P A T C H I N G -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2015-2021, 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; |
