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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;