169 lines
5.7 KiB
Ada
169 lines
5.7 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- S Y S T E M . O S _ P R I M I T I V E S --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1998-2005 Free Software Foundation, Inc. --
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-- --
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-- GNARL is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNARL; see file COPYING. If not, write --
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-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
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-- Boston, MA 02110-1301, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. --
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-- Extensive contributions were provided by Ada Core Technologies, Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This version is for POSIX-like operating systems
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package body System.OS_Primitives is
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-- ??? These definitions are duplicated from System.OS_Interface
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-- because we don't want to depend on any package. Consider removing
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-- these declarations in System.OS_Interface and move these ones in
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-- the spec.
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type struct_timezone is record
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tz_minuteswest : Integer;
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tz_dsttime : Integer;
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end record;
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pragma Convention (C, struct_timezone);
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type struct_timezone_ptr is access all struct_timezone;
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type time_t is new Long_Integer;
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type struct_timeval is record
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tv_sec : time_t;
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tv_usec : Long_Integer;
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end record;
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pragma Convention (C, struct_timeval);
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function gettimeofday
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(tv : access struct_timeval;
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tz : struct_timezone_ptr) return Integer;
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pragma Import (C, gettimeofday, "gettimeofday");
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type timespec is record
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tv_sec : time_t;
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tv_nsec : Long_Integer;
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end record;
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pragma Convention (C, timespec);
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function nanosleep (rqtp, rmtp : access timespec) return Integer;
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pragma Import (C, nanosleep, "nanosleep");
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-----------
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-- Clock --
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-----------
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function Clock return Duration is
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TV : aliased struct_timeval;
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Result : Integer;
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pragma Unreferenced (Result);
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begin
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Result := gettimeofday (TV'Access, null);
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return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
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end Clock;
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---------------------
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-- Monotonic_Clock --
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---------------------
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function Monotonic_Clock return Duration renames Clock;
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-----------------
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-- To_Timespec --
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-----------------
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function To_Timespec (D : Duration) return timespec;
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function To_Timespec (D : Duration) return timespec is
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S : time_t;
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F : Duration;
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begin
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S := time_t (Long_Long_Integer (D));
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F := D - Duration (S);
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-- If F has negative value due to a round-up, adjust for positive F
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-- value.
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if F < 0.0 then
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S := S - 1;
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F := F + 1.0;
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end if;
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return
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timespec'(tv_sec => S,
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tv_nsec => Long_Integer (Long_Long_Integer (F * 10#1#E9)));
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end To_Timespec;
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-----------------
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-- Timed_Delay --
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-----------------
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procedure Timed_Delay
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(Time : Duration;
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Mode : Integer)
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is
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Request : aliased timespec;
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Remaind : aliased timespec;
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Rel_Time : Duration;
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Abs_Time : Duration;
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Check_Time : Duration := Clock;
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Result : Integer;
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pragma Unreferenced (Result);
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begin
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if Mode = Relative then
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Rel_Time := Time;
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Abs_Time := Time + Check_Time;
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else
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Rel_Time := Time - Check_Time;
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Abs_Time := Time;
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end if;
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if Rel_Time > 0.0 then
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loop
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Request := To_Timespec (Rel_Time);
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Result := nanosleep (Request'Access, Remaind'Access);
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Check_Time := Clock;
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exit when Abs_Time <= Check_Time;
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Rel_Time := Abs_Time - Check_Time;
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end loop;
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end if;
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end Timed_Delay;
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----------------
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-- Initialize --
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----------------
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procedure Initialize is
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begin
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null;
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end Initialize;
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end System.OS_Primitives;
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