------------------------------------------------------------------------------ -- -- -- GNU ADA 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) 1998-2003 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, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, 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 is for POSIX-like operating systems 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_timezone is record tz_minuteswest : Integer; tz_dsttime : Integer; end record; pragma Convention (C, struct_timezone); type struct_timezone_ptr is access all struct_timezone; type time_t is new Long_Integer; type struct_timeval is record tv_sec : time_t; tv_usec : Long_Integer; end record; pragma Convention (C, struct_timeval); function gettimeofday (tv : access struct_timeval; tz : struct_timezone_ptr) return Integer; pragma Import (C, gettimeofday, "gettimeofday"); type timespec is record tv_sec : time_t; tv_nsec : Long_Integer; end record; pragma Convention (C, timespec); function nanosleep (rqtp, rmtp : access timespec) return Integer; pragma Import (C, nanosleep, "nanosleep"); ----------- -- Clock -- ----------- function Clock return Duration is TV : aliased struct_timeval; Result : Integer; pragma Unreferenced (Result); begin Result := gettimeofday (TV'Access, null); return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6; end Clock; --------------------- -- Monotonic_Clock -- --------------------- function Monotonic_Clock return Duration renames Clock; ----------------- -- To_Timespec -- ----------------- function To_Timespec (D : Duration) return timespec; function To_Timespec (D : Duration) return timespec is S : time_t; F : Duration; begin S := time_t (Long_Long_Integer (D)); F := D - Duration (S); -- If F has negative value due to a round-up, adjust for positive F -- value. if F < 0.0 then S := S - 1; F := F + 1.0; end if; return timespec'(tv_sec => S, tv_nsec => Long_Integer (Long_Long_Integer (F * 10#1#E9))); end To_Timespec; ----------------- -- Timed_Delay -- ----------------- procedure Timed_Delay (Time : Duration; Mode : Integer) is Request : aliased timespec; Remaind : aliased timespec; Rel_Time : Duration; Abs_Time : Duration; Check_Time : Duration := Clock; Result : Integer; pragma Unreferenced (Result); 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 Request := To_Timespec (Rel_Time); Result := nanosleep (Request'Access, Remaind'Access); Check_Time := Clock; exit when Abs_Time <= Check_Time; Rel_Time := Abs_Time - Check_Time; end loop; end if; end Timed_Delay; end System.OS_Primitives;