77 lines
3.6 KiB
Ada
77 lines
3.6 KiB
Ada
------------------------------------------------------------------------------
|
|
-- --
|
|
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
|
|
-- --
|
|
-- SYSTEM.TASKING.ASYNC_DELAYS.ENQUEUE_CALENDAR --
|
|
-- --
|
|
-- B o d y --
|
|
-- --
|
|
-- Copyright (C) 1998-2020, Free Software Foundation, Inc. --
|
|
-- --
|
|
-- GNARL 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/>. --
|
|
-- --
|
|
-- GNARL was developed by the GNARL team at Florida State University. --
|
|
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
|
|
-- --
|
|
------------------------------------------------------------------------------
|
|
|
|
with Ada.Calendar.Delays;
|
|
|
|
with System.OS_Constants;
|
|
with System.OS_Primitives;
|
|
with System.Task_Primitives.Operations;
|
|
with System.Tasking.Initialization;
|
|
|
|
function System.Tasking.Async_Delays.Enqueue_Calendar
|
|
(T : Ada.Calendar.Time;
|
|
D : Delay_Block_Access) return Boolean
|
|
is
|
|
use type Ada.Calendar.Time;
|
|
|
|
package SOSC renames System.OS_Constants;
|
|
package STPO renames System.Task_Primitives.Operations;
|
|
|
|
RT_T : Duration := Ada.Calendar.Delays.To_Duration (T);
|
|
|
|
begin
|
|
if T <= Ada.Calendar.Clock then
|
|
D.Timed_Out := True;
|
|
System.Task_Primitives.Operations.Yield;
|
|
return False;
|
|
end if;
|
|
|
|
-- T is expressed as a duration elapsed since the UNIX epoch, whereas
|
|
-- Time_Enqueue expects duration elapsed since the epoch of the Ada real-
|
|
-- time clock: compensate if necessary.
|
|
|
|
-- Comparison "SOSC.CLOCK_RT_Ada = SOSC.CLOCK_REALTIME" is compile
|
|
-- time known, so turn warnings off.
|
|
|
|
pragma Warnings (Off);
|
|
|
|
if SOSC.CLOCK_RT_Ada /= SOSC.CLOCK_REALTIME then
|
|
pragma Warnings (On);
|
|
|
|
RT_T := RT_T - OS_Primitives.Clock + STPO.Monotonic_Clock;
|
|
end if;
|
|
|
|
System.Tasking.Initialization.Defer_Abort
|
|
(System.Task_Primitives.Operations.Self);
|
|
Time_Enqueue (RT_T, D);
|
|
return True;
|
|
end System.Tasking.Async_Delays.Enqueue_Calendar;
|