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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) 1997-2005 Free Software Foundation --
+-- --
+-- 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 the VxWorks version.
+
+-- This package encapsulates all direct interfaces to OS services
+-- that are needed by children of System.
+
+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 type Interfaces.C.int;
+
+ Low_Priority : constant := 255;
+ -- VxWorks native (default) lowest scheduling priority.
+
+ ----------
+ -- kill --
+ ----------
+
+ function kill (pid : t_id; sig : Signal) return int is
+ function c_kill (pid : t_id; sig : Signal) return int;
+ pragma Import (C, c_kill, "kill");
+ begin
+ return c_kill (pid, sig);
+ end kill;
+
+ --------------------
+ -- Set_Time_Slice --
+ --------------------
+
+ function Set_Time_Slice (ticks : int) return int is
+ function kernelTimeSlice (ticks : int) return int;
+ pragma Import (C, kernelTimeSlice, "kernelTimeSlice");
+ begin
+ return kernelTimeSlice (ticks);
+ end Set_Time_Slice;
+
+ -------------
+ -- sigwait --
+ -------------
+
+ function sigwait
+ (set : access sigset_t;
+ sig : access Signal) return int
+ is
+ Result : int;
+
+ function sigwaitinfo
+ (set : access sigset_t; sigvalue : System.Address) return int;
+ pragma Import (C, sigwaitinfo, "sigwaitinfo");
+
+ begin
+ Result := sigwaitinfo (set, System.Null_Address);
+
+ if Result /= -1 then
+ sig.all := Signal (Result);
+ return 0;
+ else
+ sig.all := 0;
+ return errno;
+ end if;
+ end sigwait;
+
+ -----------------
+ -- To_Duration --
+ -----------------
+
+ function To_Duration (TS : timespec) return Duration is
+ begin
+ return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;
+ end To_Duration;
+
+ -----------------
+ -- 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'(ts_sec => S,
+ ts_nsec => long (Long_Long_Integer (F * 10#1#E9)));
+ end To_Timespec;
+
+ -------------------------
+ -- To_VxWorks_Priority --
+ -------------------------
+
+ function To_VxWorks_Priority (Priority : in int) return int is
+ begin
+ return Low_Priority - Priority;
+ end To_VxWorks_Priority;
+
+ --------------------
+ -- To_Clock_Ticks --
+ --------------------
+
+ -- ??? - For now, we'll always get the system clock rate
+ -- since it is allowed to be changed during run-time in
+ -- VxWorks. A better method would be to provide an operation
+ -- to set it that so we can always know its value.
+ --
+ -- Another thing we should probably allow for is a resultant
+ -- tick count greater than int'Last. This should probably
+ -- be a procedure with two output parameters, one in the
+ -- range 0 .. int'Last, and another representing the overflow
+ -- count.
+
+ function To_Clock_Ticks (D : Duration) return int is
+ Ticks : Long_Long_Integer;
+ Rate_Duration : Duration;
+ Ticks_Duration : Duration;
+
+ begin
+ if D < 0.0 then
+ return -1;
+ end if;
+
+ -- Ensure that the duration can be converted to ticks
+ -- at the current clock tick rate without overflowing.
+
+ Rate_Duration := Duration (sysClkRateGet);
+
+ if D > (Duration'Last / Rate_Duration) then
+ Ticks := Long_Long_Integer (int'Last);
+ else
+ Ticks_Duration := D * Rate_Duration;
+ Ticks := Long_Long_Integer (Ticks_Duration);
+
+ if Ticks_Duration > Duration (Ticks) then
+ Ticks := Ticks + 1;
+ end if;
+
+ if Ticks > Long_Long_Integer (int'Last) then
+ Ticks := Long_Long_Integer (int'Last);
+ end if;
+ end if;
+
+ return int (Ticks);
+ end To_Clock_Ticks;
+
+ ----------------
+ -- VX_FP_TASK --
+ ----------------
+
+ function VX_FP_TASK return int is
+ begin
+ return 16#0008#;
+ end VX_FP_TASK;
+
+end System.OS_Interface;