------------------------------------------------------------------------------ -- -- -- 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 -- -- -- -- -- -- 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 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 VMS_Epoch_Offset : constant Long_Integer := 10_000_000 * (3_506_716_800 + Long_Integer (Get_GMToff)); -- The offset between the Unix Epoch and the VMS Epoch subtype Cond_Value_Type is System.Aux_DEC.Unsigned_Longword; -- Condition Value return type ---------------- -- 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 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;