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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . O S _ I N T E R F A C E --
-- --
-- B o d y --
-- --
-- Copyright (C) 1999-2006 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, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, 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 is a Darwin Threads version of this package
pragma Polling (Off);
-- Turn off polling, we do not want ATC polling to take place during
-- tasking operations. It causes infinite loops and other problems.
package body System.OS_Interface is
use Interfaces.C;
-----------------
-- To_Duration --
-----------------
function To_Duration (TS : timespec) return Duration is
begin
return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
end To_Duration;
function To_Duration (TV : struct_timeval) return Duration is
begin
return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
end To_Duration;
------------------------
-- To_Target_Priority --
------------------------
function To_Target_Priority
(Prio : System.Any_Priority) return Interfaces.C.int
is
begin
return Interfaces.C.int (Prio);
end To_Target_Priority;
-----------------
-- To_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 => int32_t (Long_Long_Integer (F * 10#1#E9)));
end To_Timespec;
----------------
-- To_Timeval --
----------------
function To_Timeval (D : Duration) return struct_timeval is
S : int32_t;
F : Duration;
begin
S := int32_t (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 struct_timeval'
(Tv_Sec => S,
tv_usec => int32_t (Long_Long_Integer (F * 10#1#E6)));
end To_Timeval;
-------------------
-- clock_gettime --
-------------------
function clock_gettime
(clock_id : clockid_t;
tp : access timespec) return int
is
pragma Unreferenced (clock_id);
Result : int;
tv : aliased struct_timeval;
function gettimeofday
(tv : access struct_timeval;
tz : System.Address := System.Null_Address) return int;
pragma Import (C, gettimeofday, "gettimeofday");
begin
Result := gettimeofday (tv'Unchecked_Access);
tp.all := To_Timespec (To_Duration (tv));
return Result;
end clock_gettime;
-----------------
-- sched_yield --
-----------------
function sched_yield return int is
procedure sched_yield_base (arg : System.Address);
pragma Import (C, sched_yield_base, "pthread_yield_np");
begin
sched_yield_base (System.Null_Address);
return 0;
end sched_yield;
------------------
-- pthread_init --
------------------
procedure pthread_init is
begin
null;
end pthread_init;
----------------
-- Stack_Base --
----------------
function Get_Stack_Base (thread : pthread_t) return Address is
pragma Unreferenced (thread);
begin
return System.Null_Address;
end Get_Stack_Base;
end System.OS_Interface;
|
