------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . S Y N C H R O N O U S _ T A S K _ C O N T R O L --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2023, Free Software Foundation, Inc. --
-- --
-- This specification is derived from the Ada Reference Manual for use with --
-- GNAT. The copyright notice above, and the license provisions that follow --
-- apply solely to the contents of the part following the private keyword. --
-- --
-- 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 the generic bare board version of this package
with Ada.Task_Identification;
package Ada.Synchronous_Task_Control with
SPARK_Mode
is
pragma Preelaborate;
-- In accordance with Ada 2005 AI-362
type Suspension_Object is limited private with
Default_Initial_Condition;
procedure Set_True (S : in out Suspension_Object) with
Global => null,
Depends => (S => null,
null => S);
procedure Set_False (S : in out Suspension_Object) with
Global => null,
Depends => (S => null,
null => S);
function Current_State (S : Suspension_Object) return Boolean with
Volatile_Function,
Global => Ada.Task_Identification.Tasking_State;
procedure Suspend_Until_True (S : in out Suspension_Object) with
Global => null,
Depends => (S => null,
null => S);
private
pragma SPARK_Mode (Off);
-- Using a protected object may seem overkill, but assuming the
-- appropriate restrictions (such as those imposed by the Ravenscar
-- profile) protected operations are very efficient. Moreover, this
-- allows for a generic implementation that is not dependent on the
-- underlying operating system.
protected type Suspension_Object is
entry Wait
with Max_Queue_Length => 1;
-- At most one task can be waiting, in accordance to D.10/10
procedure Set_False;
procedure Set_True;
function Get_Open return Boolean;
pragma Interrupt_Priority;
private
Open : Boolean := False;
-- Status
end Suspension_Object;
end Ada.Synchronous_Task_Control;