------------------------------------------------------------------------------ -- -- -- GNU ADA 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) 1997-2002 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, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, 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. ------------- -- 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; end System.OS_Interface;