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+------------------------------------------------------------------------------
+-- --
+-- GNAT 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 --
+-- --
+-- Copyright (C) 1998-2005 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, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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 OpenVMS/Alpha version of this file
+
+with System.Aux_DEC;
+
+package body System.OS_Primitives is
+
+ --------------------------------------
+ -- Local functions and declarations --
+ --------------------------------------
+
+ function Get_GMToff return Integer;
+ pragma Import (C, Get_GMToff, "get_gmtoff");
+ -- Get the offset from GMT for this timezone
+
+ function VMS_Epoch_Offset return Long_Integer;
+ pragma Inline (VMS_Epoch_Offset);
+ -- The offset between the Unix Epoch and the VMS Epoch
+
+ subtype Cond_Value_Type is System.Aux_DEC.Unsigned_Longword;
+ -- Condition Value return type
+
+ ----------------------
+ -- VMS_Epoch_Offset --
+ ----------------------
+
+ function VMS_Epoch_Offset return Long_Integer is
+ begin
+ return 10_000_000 * (3_506_716_800 + Long_Integer (Get_GMToff));
+ end VMS_Epoch_Offset;
+
+ ----------------
+ -- Sys_Schdwk --
+ ----------------
+ --
+ -- Schedule Wakeup
+ --
+ -- status = returned status
+ -- pidadr = address of process id to be woken up
+ -- prcnam = name of process to be woken up
+ -- daytim = time to wake up
+ -- reptim = repitition interval of wakeup calls
+ --
+
+ procedure Sys_Schdwk
+ (
+ Status : out Cond_Value_Type;
+ Pidadr : in Address := Null_Address;
+ Prcnam : in String := String'Null_Parameter;
+ Daytim : in Long_Integer;
+ Reptim : in Long_Integer := Long_Integer'Null_Parameter
+ );
+
+ pragma Interface (External, Sys_Schdwk);
+ -- VMS system call to schedule a wakeup event
+ pragma Import_Valued_Procedure
+ (Sys_Schdwk, "SYS$SCHDWK",
+ (Cond_Value_Type, Address, String, Long_Integer, Long_Integer),
+ (Value, Value, Descriptor (S), Reference, Reference)
+ );
+
+ ----------------
+ -- Sys_Gettim --
+ ----------------
+ --
+ -- Get System Time
+ --
+ -- status = returned status
+ -- tim = current system time
+ --
+
+ procedure Sys_Gettim
+ (
+ Status : out Cond_Value_Type;
+ Tim : out OS_Time
+ );
+ -- VMS system call to get the current system time
+ pragma Interface (External, Sys_Gettim);
+ pragma Import_Valued_Procedure
+ (Sys_Gettim, "SYS$GETTIM",
+ (Cond_Value_Type, OS_Time),
+ (Value, Reference)
+ );
+
+ ---------------
+ -- Sys_Hiber --
+ ---------------
+
+ -- Hibernate (until woken up)
+
+ -- status = returned status
+
+ procedure Sys_Hiber (Status : out Cond_Value_Type);
+ -- VMS system call to hibernate the current process
+ pragma Interface (External, Sys_Hiber);
+ pragma Import_Valued_Procedure
+ (Sys_Hiber, "SYS$HIBER",
+ (Cond_Value_Type),
+ (Value)
+ );
+
+ -----------
+ -- Clock --
+ -----------
+
+ function OS_Clock return OS_Time is
+ Status : Cond_Value_Type;
+ T : OS_Time;
+ begin
+ Sys_Gettim (Status, T);
+ return (T);
+ end OS_Clock;
+
+ -----------
+ -- Clock --
+ -----------
+
+ function Clock return Duration is
+ begin
+ return To_Duration (OS_Clock, Absolute_Calendar);
+ end Clock;
+
+ ---------------------
+ -- Monotonic_Clock --
+ ---------------------
+
+ function Monotonic_Clock return Duration renames Clock;
+
+ -----------------
+ -- Timed_Delay --
+ -----------------
+
+ procedure Timed_Delay
+ (Time : Duration;
+ Mode : Integer)
+ is
+ Sleep_Time : OS_Time;
+ Status : Cond_Value_Type;
+
+ begin
+ Sleep_Time := To_OS_Time (Time, Mode);
+ Sys_Schdwk (Status => Status, Daytim => Sleep_Time);
+ Sys_Hiber (Status);
+ end Timed_Delay;
+
+ -----------------
+ -- To_Duration --
+ -----------------
+
+ function To_Duration (T : OS_Time; Mode : Integer) return Duration is
+ pragma Warnings (Off, Mode);
+ begin
+ return Duration'Fixed_Value (T - VMS_Epoch_Offset) * 100;
+ end To_Duration;
+
+ ----------------
+ -- To_OS_Time --
+ ----------------
+
+ function To_OS_Time (D : Duration; Mode : Integer) return OS_Time is
+ begin
+ if Mode = Relative then
+ return -(Long_Integer'Integer_Value (D) / 100);
+ else
+ return Long_Integer'Integer_Value (D) / 100 + VMS_Epoch_Offset;
+ end if;
+ end To_OS_Time;
+
+end System.OS_Primitives;