+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
--- --
--- S Y S T E M . O S _ P R I M I T I V E S --
--- --
--- B o d y --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1998-2001 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 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. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- This is the OS/2 version of this package
-
-with Interfaces.C; use Interfaces.C;
-with Interfaces.OS2Lib; use Interfaces.OS2Lib;
-with Interfaces.OS2Lib.Synchronization; use Interfaces.OS2Lib.Synchronization;
-
-package body System.OS_Primitives is
-
- ----------------
- -- Local Data --
- ----------------
-
- Epoch_Offset : Duration; -- See Set_Epoch_Offset
- Max_Tick_Count : QWORD := 0.0;
- -- This is needed to compensate for small glitches in the
- -- hardware clock or the way it is read by the OS
-
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- procedure Set_Epoch_Offset;
- -- Initializes the Epoch_1970_Offset to the offset of the System_Clock
- -- relative to the Unix epoch (Jan 1, 1970), such that
- -- Clock = System_Clock + Epoch_1970_Offset
-
- function System_Clock return Duration;
- pragma Inline (System_Clock);
- -- Function returning value of system clock with system-dependent timebase.
- -- For OS/2 the system clock returns the elapsed time since system boot.
- -- The clock resolution is approximately 838 ns.
-
- ------------------
- -- System_Clock --
- ------------------
-
- function System_Clock return Duration is
-
- -- Implement conversion from tick count to Duration
- -- using fixed point arithmetic. The frequency of
- -- the Intel 8254 timer chip is 18.2 * 2**16 Hz.
-
- Tick_Duration : constant := 1.0 / (18.2 * 2**16);
- Tick_Count : aliased QWORD;
-
- begin
- Must_Not_Fail (DosTmrQueryTime (Tick_Count'Access));
- -- Read nr of clock ticks since boot time
-
- Max_Tick_Count := QWORD'Max (Tick_Count, Max_Tick_Count);
-
- return Max_Tick_Count * Tick_Duration;
- end System_Clock;
-
- -----------
- -- Clock --
- -----------
-
- function Clock return Duration is
- begin
- return System_Clock + Epoch_Offset;
- end Clock;
-
- ---------------------
- -- Monotonic_Clock --
- ---------------------
-
- function Monotonic_Clock return Duration renames Clock;
-
- ----------------------
- -- Set_Epoch_Offset --
- ----------------------
-
- procedure Set_Epoch_Offset is
-
- -- Interface to Unix C style gettimeofday
-
- type timeval is record
- tv_sec : long;
- tv_usec : long;
- end record;
-
- procedure gettimeofday
- (time : access timeval;
- zone : System.Address := System.Address'Null_Parameter);
- pragma Import (C, gettimeofday);
-
- Time_Of_Day : aliased timeval;
- Micro_To_Nano : constant := 1.0E3;
- Sec_To_Nano : constant := 1.0E9;
- Nanos_Since_Epoch : QWORD;
-
- begin
- gettimeofday (Time_Of_Day'Access);
- Nanos_Since_Epoch := QWORD (Time_Of_Day.tv_sec) * Sec_To_Nano
- + QWORD (Time_Of_Day.tv_usec) * Micro_To_Nano;
-
- Epoch_Offset :=
- Duration'(Nanos_Since_Epoch / Sec_To_Nano) - System_Clock;
-
- end Set_Epoch_Offset;
-
- -----------------
- -- Timed_Delay --
- -----------------
-
- procedure Timed_Delay
- (Time : Duration;
- Mode : Integer)
- is
- Rel_Time : Duration;
- Abs_Time : Duration;
- Check_Time : Duration := Clock;
-
- begin
- if Mode = Relative then
- Rel_Time := Time;
- Abs_Time := Time + Check_Time;
- else
- Rel_Time := Time - Check_Time;
- Abs_Time := Time;
- end if;
-
- if Rel_Time > 0.0 then
- loop
- Must_Not_Fail (DosSleep (ULONG (Rel_Time * 1000.0)));
-
- Check_Time := Clock;
-
- exit when Abs_Time <= Check_Time;
-
- Rel_Time := Abs_Time - Check_Time;
- end loop;
- end if;
- end Timed_Delay;
-
-begin
- Set_Epoch_Offset;
-end System.OS_Primitives;
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