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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) 1999-2009, 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 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;
------------------------
-- 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 => long (Long_Long_Integer (F * 10#1#E9)));
end To_Timespec;
-------------------
-- clock_gettime --
-------------------
function clock_gettime
(clock_id : clockid_t;
tp : access timespec) return int
is
pragma Unreferenced (clock_id);
-- Darwin Threads don't have clock_gettime, so use gettimeofday
use Interfaces;
type timeval is array (1 .. 2) of C.long;
procedure timeval_to_duration
(T : not null access timeval;
sec : not null access C.long;
usec : not null access C.long);
pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration");
Micro : constant := 10**6;
sec : aliased C.long;
usec : aliased C.long;
TV : aliased timeval;
Result : int;
function gettimeofday
(Tv : access timeval;
Tz : System.Address := System.Null_Address) return int;
pragma Import (C, gettimeofday, "gettimeofday");
begin
Result := gettimeofday (TV'Access, System.Null_Address);
pragma Assert (Result = 0);
timeval_to_duration (TV'Access, sec'Access, usec'Access);
tp.all := To_Timespec (Duration (sec) + Duration (usec) / Micro);
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;
--------------
-- lwp_self --
--------------
function lwp_self return Address is
function pthread_mach_thread_np (thread : pthread_t) return Address;
pragma Import (C, pthread_mach_thread_np, "pthread_mach_thread_np");
begin
return pthread_mach_thread_np (pthread_self);
end lwp_self;
------------------
-- 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;
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