-- --
-- B o d y --
-- --
--- Copyright (C) 1998-2005 Free Software Foundation, Inc. --
+-- 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 2, or (at your option) any later ver- --
--- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
+-- 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. 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. --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
--- 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. --
+-- 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. --
-- 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;
+ function nanosleep (rqtp, rmtp : not null access timespec) return Integer;
pragma Import (C, nanosleep, "nanosleep");
-----------
-----------
function Clock return Duration is
- TV : aliased struct_timeval;
-
+ 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
- Result := gettimeofday (TV'Access, null);
- return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
+ -- 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;
---------------------
(Time : Duration;
Mode : Integer)
is
- Request : aliased timespec;
- Remaind : aliased timespec;
- Rel_Time : Duration;
- Abs_Time : Duration;
- Check_Time : Duration := Clock;
+ 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);
Result := nanosleep (Request'Access, Remaind'Access);
Check_Time := Clock;
- exit when Abs_Time <= Check_Time;
+ 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;
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