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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [s-osprim-vms.adb] - Rev 839
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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) 1998-2009, 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 3, or (at your option) any later ver- -- -- sion. GNAT 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. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- <http://www.gnu.org/licenses/>. -- -- -- -- 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 = repetition interval of wakeup calls -- procedure Sys_Schdwk ( Status : out Cond_Value_Type; Pidadr : Address := Null_Address; Prcnam : String := String'Null_Parameter; Daytim : Long_Integer; Reptim : 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; ---------------- -- Initialize -- ---------------- procedure Initialize is begin null; end Initialize; --------------------- -- 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; pragma Unreferenced (Status); 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;
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