diff options
author | Vasiliy Fofanov <fofanov@adacore.com> | 2007-06-06 12:15:55 +0200 |
---|---|---|
committer | Arnaud Charlet <charlet@gcc.gnu.org> | 2007-06-06 12:15:55 +0200 |
commit | 0cb8d27cd3ab2935184bd54c917c980a60f11565 (patch) | |
tree | e8834769c122a46f5c2f47e940b9a22423bff82e /gcc/ada/s-osprim-vms.ads | |
parent | df862408038ca7025bc3e758b693e4824c3b912b (diff) | |
download | gcc-0cb8d27cd3ab2935184bd54c917c980a60f11565.zip gcc-0cb8d27cd3ab2935184bd54c917c980a60f11565.tar.gz gcc-0cb8d27cd3ab2935184bd54c917c980a60f11565.tar.bz2 |
2007-04-20 Vasiliy Fofanov <fofanov@adacore.com>
* s-osprim-vms.ads, s-osprim-vms.adb
(Initialize) New procedure. Noop on VMS, added for interface
commonality.
From-SVN: r125369
Diffstat (limited to 'gcc/ada/s-osprim-vms.ads')
-rw-r--r-- | gcc/ada/s-osprim-vms.ads | 53 |
1 files changed, 29 insertions, 24 deletions
diff --git a/gcc/ada/s-osprim-vms.ads b/gcc/ada/s-osprim-vms.ads index 91d545c..d81ea37 100644 --- a/gcc/ada/s-osprim-vms.ads +++ b/gcc/ada/s-osprim-vms.ads @@ -6,7 +6,7 @@ -- -- -- S p e c -- -- -- --- Copyright (C) 1998-2005 Free Software Foundation, Inc. -- +-- Copyright (C) 1998-2007, 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- -- @@ -27,12 +27,12 @@ -- 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. -- +-- 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 +-- 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) @@ -52,14 +52,19 @@ package System.OS_Primitives is 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 - -- 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. + -- 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 @@ -67,33 +72,33 @@ package System.OS_Primitives is function Clock return Duration; pragma Inline (Clock); - -- Returns "absolute" time, represented as an offset - -- relative to "the Epoch", which is Jan 1, 1970 on unixes. - -- This implementation is affected by system's clock changes. + -- 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 Epoch", which is Jan 1, 1970. - -- This clock implementation is immune to the system's clock changes. + -- 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. + -- 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. + -- 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. + -- 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; |