g-os_lib.ads (Current_Time): New function.

2007-04-06  Pascal Obry  <obry@adacore.com>
	    Thomas Quinot  <quinot@adacore.com>

	* g-os_lib.ads (Current_Time): New function. Returns the current
	system time as an OS_Time value.

	* s-osprim.ads (Clock): Add more precise definition of UNIX epoch.
	(Monotonic_Clock): Same.

From-SVN: r123547

gcc/ada/g-os_lib.ads

@@ -114,6 +114,9 @@ package GNAT.OS_Lib is
    subtype Second_Type is Integer range    0 ..   59;
    --  Declarations similar to those in Calendar, breaking down the time
 
+   function Current_Time return OS_Time;
+   --  Return the system clock value as OS_Time
+
    function GM_Year    (Date : OS_Time) return Year_Type;
    function GM_Month   (Date : OS_Time) return Month_Type;
    function GM_Day     (Date : OS_Time) return Day_Type;
@@ -131,15 +134,16 @@ package GNAT.OS_Lib is
    --  to create accesses to any of these functions.
 
    procedure GM_Split
-     (Date    : OS_Time;
-      Year    : out Year_Type;
-      Month   : out Month_Type;
-      Day     : out Day_Type;
-      Hour    : out Hour_Type;
-      Minute  : out Minute_Type;
-      Second  : out Second_Type);
-   --  Analogous to the routine of similar name in Calendar, takes an OS_Time
-   --  and splits it into its component parts with obvious meanings.
+     (Date   : OS_Time;
+      Year   : out Year_Type;
+      Month  : out Month_Type;
+      Day    : out Day_Type;
+      Hour   : out Hour_Type;
+      Minute : out Minute_Type;
+      Second : out Second_Type);
+   --  Analogous to the Split routine in Ada.Calendar, takes an OS_Time
+   --  and provides a representation of it as a set of component parts,
+   --  to be interpreted as a date point in UTC.
 
    ----------------
    -- File Stuff --
@@ -836,6 +840,7 @@ package GNAT.OS_Lib is
 private
    pragma Import (C, Path_Separator, "__gnat_path_separator");
    pragma Import (C, Directory_Separator, "__gnat_dir_separator");
+   pragma Import (C, Current_Time, "__gnat_current_time");
 
    type OS_Time is new Long_Integer;
    --  Type used for timestamps in the compiler. This type is used to hold

gcc/ada/s-osprim.ads

@@ -6,7 +6,7 @@
 --                                                                          --
 --                                  S p e c                                 --
 --                                                                          --
---          Copyright (C) 1998-2005 Free Software Foundation, Inc.          --
+--          Copyright (C) 1998-2006, 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- --
@@ -45,49 +45,49 @@ 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 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.
+   --  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 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.
 
 end System.OS_Primitives;