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------------------------------------------------------------------------------ -- -- -- 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) 1998-2009, 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 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 time_t is new Long_Integer; type timespec is record tv_sec : time_t; tv_nsec : Long_Integer; end record; pragma Convention (C, timespec); function nanosleep (rqtp, rmtp : not null access timespec) return Integer; pragma Import (C, nanosleep, "nanosleep"); ----------- -- Clock -- ----------- function Clock return Duration is type timeval is array (1 .. 2) of Long_Integer; procedure timeval_to_duration (T : not null access timeval; sec : not null access Long_Integer; usec : not null access Long_Integer); pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration"); Micro : constant := 10**6; sec : aliased Long_Integer; usec : aliased Long_Integer; TV : aliased timeval; Result : Integer; pragma Unreferenced (Result); function gettimeofday (Tv : access timeval; Tz : System.Address := System.Null_Address) return Integer; pragma Import (C, gettimeofday, "gettimeofday"); begin -- The return codes for gettimeofday are as follows (from man pages): -- EPERM settimeofday is called by someone other than the superuser -- EINVAL Timezone (or something else) is invalid -- EFAULT One of tv or tz pointed outside accessible address space -- None of these codes signal a potential clock skew, hence the return -- value is never checked. Result := gettimeofday (TV'Access, System.Null_Address); timeval_to_duration (TV'Access, sec'Access, usec'Access); return Duration (sec) + Duration (usec) / Micro; 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; Base_Time : constant Duration := Clock; Check_Time : Duration := Base_Time; 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 or else Check_Time < Base_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;