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