--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/s-osprim__lynxos.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,80 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                 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) 1998-2017, 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 package provides low level primitives used to implement clock and
+--  delays in non tasking applications, for LynxOS.
+
+--  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;
+
+   Max_Sensible_Delay : constant Duration := 16#10_0000.0#;
+   --  LynxOS does not support delays as long as half a year, so we set this to
+   --  a shorter, but still fairly long, duration. Experiments show that if
+   --  pthread_cond_timedwait is passed an abstime much greater than about
+   --  2**21, it fails, returning EAGAIN. The cutoff is somewhere between
+   --  16#20_8000.0# and 16#20_F000.0#. This behavior is not documented.
+
+   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 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.
+
+   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.
+
+end System.OS_Primitives;