From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/ada/s-osprim-vms.ads | 110 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 110 insertions(+) create mode 100644 gcc/ada/s-osprim-vms.ads (limited to 'gcc/ada/s-osprim-vms.ads') diff --git a/gcc/ada/s-osprim-vms.ads b/gcc/ada/s-osprim-vms.ads new file mode 100644 index 000000000..3b4ed328c --- /dev/null +++ b/gcc/ada/s-osprim-vms.ads @@ -0,0 +1,110 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- +-- -- +-- S Y S T E M . O S _ P R I M I T I V E S -- +-- -- +-- S p e c -- +-- -- +-- 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 -- +-- . -- +-- -- +-- GNARL was developed by the GNARL team at Florida State University. -- +-- Extensive contributions were provided by Ada Core Technologies, Inc. -- +-- -- +------------------------------------------------------------------------------ + +-- This package provides low level primitives used to implement clock and +-- delays in non tasking applications on Alpha/VMS. + +-- The choice of the real clock/delay implementation (depending on whether +-- tasking is involved or not) is done via soft links (see s-soflin.ads) + +-- NEVER add any dependency to tasking packages here + +package System.OS_Primitives is + pragma Preelaborate; + + subtype OS_Time is Long_Integer; + -- System time on VMS is used for performance reasons. + -- Note that OS_Time is *not* the same as Ada.Calendar.Time, the + -- difference being that relative OS_Time is negative, but relative + -- Calendar.Time is positive. + -- See Ada.Calendar.Delays for more information on VMS Time. + + Max_Sensible_Delay : constant Duration := + Duration'Min (183 * 24 * 60 * 60.0, + Duration'Last); + -- Max of half a year delay, needed to prevent exceptions for large delay + -- values. It seems unlikely that any test will notice this restriction, + -- except in the case of applications setting the clock at run time (see + -- s-tastim.adb). Also note that a larger value might cause problems (e.g + -- overflow, or more likely OS limitation in the primitives used). In the + -- case where half a year is too long (which occurs in high integrity mode + -- with 32-bit words, and possibly on some specific ports of GNAT), + -- Duration'Last is used instead. + + procedure Initialize; + -- Initialize global settings related to this package. This procedure + -- should be called before any other subprograms in this package. Note + -- that this procedure can be called several times. + + function OS_Clock return OS_Time; + -- Returns "absolute" time, represented as an offset + -- relative to "the Epoch", which is Nov 17, 1858 on VMS. + + function Clock return Duration; + pragma Inline (Clock); + -- Returns "absolute" time, represented as an offset relative to "the + -- Epoch", which is Jan 1, 1970 00:00:00 UTC on UNIX systems. This + -- implementation is affected by system's clock changes. + + function Monotonic_Clock return Duration; + pragma Inline (Monotonic_Clock); + -- Returns "absolute" time, represented as an offset relative to "the Unix + -- Epoch", which is Jan 1, 1970 00:00:00 UTC. This clock implementation is + -- immune to the system's clock changes. + + Relative : constant := 0; + Absolute_Calendar : constant := 1; + Absolute_RT : constant := 2; + -- Values for Mode call below. Note that the compiler (exp_ch9.adb) relies + -- on these values. So any change here must be reflected in corresponding + -- changes in the compiler. + + procedure Timed_Delay (Time : Duration; Mode : Integer); + -- Implements the semantics of the delay statement when no tasking is used + -- in the application. + -- + -- Mode is one of the three values above + -- + -- Time is a relative or absolute duration value, depending on Mode. + -- + -- Note that currently Ada.Real_Time always uses the tasking run time, + -- so this procedure should never be called with Mode set to Absolute_RT. + -- This may change in future or bare board implementations. + + function To_Duration (T : OS_Time; Mode : Integer) return Duration; + -- Convert VMS system time to Duration + -- Mode is one of the three values above + + function To_OS_Time (D : Duration; Mode : Integer) return OS_Time; + -- Convert Duration to VMS system time + -- Mode is one of the three values above + +end System.OS_Primitives; -- cgit v1.2.3