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Diffstat (limited to 'gcc/ada/s-osprim-vms.adb')
| -rw-r--r-- | gcc/ada/s-osprim-vms.adb | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/gcc/ada/s-osprim-vms.adb b/gcc/ada/s-osprim-vms.adb new file mode 100644 index 00000000000..c49c861bf34 --- /dev/null +++ b/gcc/ada/s-osprim-vms.adb @@ -0,0 +1,193 @@ +------------------------------------------------------------------------------ +-- -- +-- 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; |