| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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) 1998-2002 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 |
| 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; |
