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------------------------------------------------------------------------------
-- --
-- GNU ADA RUNTIME LIBRARY (GNARL) COMPONENTS --
-- --
-- A D A . C A L E N D A R . D E L A Y S --
-- --
-- B o d y --
-- --
-- $Revision: 1.23 $ --
-- --
-- Copyright (C) 1991,1992,1993,1994,1995,1996 Florida State University --
-- --
-- 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 2, or (at your option) any later ver- --
-- sion. GNARL 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNARL; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. It is --
-- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
-- State University (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
with System;
-- Used for, Priority
with System.Task_Timer;
-- Used for, Timer
-- Max_Sensible_Delay
with System.Task_Primitives;
-- Used for, Cond_Timed_Wait
-- Lock
-- Condition_Variable
-- Initialize_Lock
-- Initialize_Cond
-- Write_Lock
-- Unlock
with System.Task_Clock;
-- Used for, Stimespec
with System.Task_Clock.Machine_Specifics;
-- Used for, Stimespec_Ticks;
with Ada.Calendar.Conv;
-- Used for, Time_To_Stimespec
with Ada.Finalization;
package body Ada.Calendar.Delays is
function "+" (L, R : System.Task_Clock.Stimespec) return
System.Task_Clock.Stimespec renames System.Task_Clock."+";
package Delay_Objects is
type Delay_Mutex_CV is new Ada.Finalization.Limited_Controlled with
record
L : System.Task_Primitives.Lock;
C : System.Task_Primitives.Condition_Variable;
end record;
procedure Initialize (Object : in out Delay_Mutex_CV);
procedure Finalize (Object : in out Delay_Mutex_CV);
procedure Delay_For (Object : in out Delay_Mutex_CV; D : Duration);
procedure Delay_Until (Object : in out Delay_Mutex_CV; T : Time);
end Delay_Objects;
package body Delay_Objects is
procedure Initialize (Object : in out Delay_Mutex_CV) is
begin
System.Task_Primitives.Initialize_Lock
(System.Priority'Last, Object.L);
System.Task_Primitives.Initialize_Cond (Object.C);
end Initialize;
procedure Finalize (Object : in out Delay_Mutex_CV) is
begin
System.Task_Primitives.Finalize_Cond (Object.C);
System.Task_Primitives.Finalize_Lock (Object.L);
end Finalize;
procedure Delay_For (Object : in out Delay_Mutex_CV; D : Duration) is
Error : Boolean;
Result : Boolean;
New_T : System.Task_Clock.Stimespec;
begin
System.Task_Primitives.Write_Lock (Object.L, Error);
New_T :=
Calendar.Conv.Time_To_Stimespec
(Clock + Duration'Min (D, System.Task_Timer.Max_Sensible_Delay)) +
System.Task_Clock.Machine_Specifics.Stimespec_Ticks;
System.Task_Primitives.Cond_Timed_Wait
(Object.C, Object.L, New_T, Result);
System.Task_Primitives.Unlock (Object.L);
end Delay_For;
procedure Delay_Until (Object : in out Delay_Mutex_CV; T : Time) is
Error, Result : Boolean;
begin
System.Task_Primitives.Write_Lock (Object.L, Error);
System.Task_Primitives.Cond_Timed_Wait
(Object.C,
Object.L,
Calendar.Conv.Time_To_Stimespec (T) +
System.Task_Clock.Machine_Specifics.Stimespec_Ticks,
Result);
System.Task_Primitives.Unlock (Object.L);
end Delay_Until;
end Delay_Objects;
------------------
-- Delay_Object --
------------------
protected body Delay_Object is
entry Wait (T : Duration; D : access System.Task_Timer.Delay_Block)
when True is
begin
requeue System.Task_Timer.Timer.Enqueue_Duration with abort;
end Wait;
end Delay_Object;
------------------------
-- Delay_Until_Object --
------------------------
protected body Delay_Until_Object is
entry Wait (T : Time; D : access System.Task_Timer.Delay_Block)
when True is
begin
requeue System.Task_Timer.Timer.Enqueue_Calendar_Time with abort;
end Wait;
end Delay_Until_Object;
---------------
-- Delay_For --
---------------
procedure Delay_For (D : Duration) is
DMCV : Delay_Objects.Delay_Mutex_CV;
begin
Delay_Objects.Delay_For (DMCV, D);
end Delay_For;
-----------------
-- Delay_Until --
-----------------
procedure Delay_Until (T : Time) is
DMCV : Delay_Objects.Delay_Mutex_CV;
begin
Delay_Objects.Delay_Until (DMCV, T);
end Delay_Until;
end Ada.Calendar.Delays;
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