| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- S Y S T E M . O S _ P R I M I T I V E S. T I M E D _ D E L A Y -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2012-2022, AdaCore -- |
| -- -- |
| -- 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 Posix, Posix2008, and LynxOS version of this procedure. |
| |
| separate (System.OS_Primitives) |
| procedure Timed_Delay |
| (Time : Duration; |
| Mode : Integer) |
| is |
| Request : aliased timespec; |
| Remaind : aliased timespec; |
| Rel_Time : Duration; |
| Abs_Time : Duration; |
| Base_Time : constant Duration := Clock; |
| Check_Time : Duration := Base_Time; |
| Time_Chunk : Duration; |
| |
| Result : Integer; |
| pragma Unreferenced (Result); |
| |
| begin |
| if Mode = Relative then |
| Rel_Time := Time; |
| Abs_Time := Time + Check_Time; |
| else |
| Rel_Time := Time - Check_Time; |
| Abs_Time := Time; |
| end if; |
| |
| -- To keep a sensible Max_Sensible_Delay on a target whose system |
| -- maximum is less than sensible, we split the delay into manageable |
| -- chunks of time less than or equal to the Max_System_Delay. |
| |
| if Rel_Time > 0.0 then |
| Time_Chunk := Rel_Time; |
| loop |
| pragma Warnings (Off, "condition is always *"); |
| if Max_System_Delay < Max_Sensible_Delay and then |
| Time_Chunk > Max_System_Delay |
| then |
| Time_Chunk := Max_System_Delay; |
| end if; |
| pragma Warnings (On); |
| |
| Request := To_Timespec (Time_Chunk); |
| Result := nanosleep (Request'Access, Remaind'Access); |
| |
| Check_Time := Clock; |
| |
| exit when Abs_Time <= Check_Time or else Check_Time < Base_Time; |
| |
| Time_Chunk := Abs_Time - Check_Time; |
| end loop; |
| end if; |
| end Timed_Delay; |
