------------------------------------------------------------------------------ -- -- -- 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) 1998-2005 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 2, or (at your option) any later ver- -- -- sion. GNARL 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. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNARL; see file COPYING. If not, write -- -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- -- Boston, MA 02110-1301, USA. -- -- -- -- As a special exception, if other files instantiate generics from this -- -- unit, or you link this unit with other files to produce an executable, -- -- this unit does not by itself cause the resulting executable to be -- -- covered by the GNU General Public License. This exception does not -- -- however invalidate any other reasons why the executable file might be -- -- 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. -- -- -- ------------------------------------------------------------------------------ -- This version uses gettimeofday and select -- This file is suitable for OpenNT, Dec Unix and SCO UnixWare. package body System.OS_Primitives is -- ??? These definitions are duplicated from System.OS_Interface -- because we don't want to depend on any package. Consider removing -- these declarations in System.OS_Interface and move these ones in -- the spec. type struct_timeval is record tv_sec : Integer; tv_usec : Integer; end record; pragma Convention (C, struct_timeval); procedure gettimeofday (tv : access struct_timeval; tz : Address := Null_Address); pragma Import (C, gettimeofday, "gettimeofday"); procedure C_select (n : Integer := 0; readfds, writefds, exceptfds : Address := Null_Address; timeout : access struct_timeval); pragma Import (C, C_select, "select"); ----------- -- Clock -- ----------- function Clock return Duration is TV : aliased struct_timeval; begin gettimeofday (TV'Access); return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6; end Clock; --------------------- -- Monotonic_Clock -- --------------------- function Monotonic_Clock return Duration renames Clock; ----------------- -- Timed_Delay -- ----------------- procedure Timed_Delay (Time : Duration; Mode : Integer) is Rel_Time : Duration; Abs_Time : Duration; Check_Time : Duration := Clock; timeval : aliased struct_timeval; begin if Mode = Relative then Rel_Time := Time; Abs_Time := Time + Check_Time; else Rel_Time := Time - Check_Time; Abs_Time := Time; end if; if Rel_Time > 0.0 then loop timeval.tv_sec := Integer (Rel_Time); if Duration (timeval.tv_sec) > Rel_Time then timeval.tv_sec := timeval.tv_sec - 1; end if; timeval.tv_usec := Integer ((Rel_Time - Duration (timeval.tv_sec)) * 10#1#E6); C_select (timeout => timeval'Unchecked_Access); Check_Time := Clock; exit when Abs_Time <= Check_Time; Rel_Time := Abs_Time - Check_Time; end loop; end if; end Timed_Delay; ---------------- -- Initialize -- ---------------- procedure Initialize is begin null; end Initialize; end System.OS_Primitives;