| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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 -- |
| -- -- |
| -- $Revision: 1.4 $ -- |
| -- -- |
| -- Copyright (C) 1998-2001 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. It is -- |
| -- now maintained by Ada Core Technologies Inc. in cooperation with Florida -- |
| -- State University (http://www.gnat.com). -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- 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 Integer; |
| |
| type struct_timeval is record |
| tv_sec : time_t; |
| tv_usec : 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; |
| |
| 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; |
| Result : Integer; |
| Rel_Time : Duration; |
| Abs_Time : Duration; |
| Check_Time : Duration := Clock; |
| 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; |
