------------------------------------------------------------------------------ -- -- -- 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) 1997-2007, 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 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 ------------ -- getpid -- ------------ function getpid return t_id is begin -- VxWorks 5 (and VxWorks 6 in kernel mode) does not have a getpid -- function. taskIdSelf is the equivalent routine. return taskIdSelf; end getpid; -------------- -- Int_Lock -- -------------- function Int_Lock return int is function intLock return int; pragma Import (C, intLock, "intLock"); begin return intLock; end Int_Lock; ---------------- -- Int_Unlock -- ---------------- function Int_Unlock return int is function intUnlock return int; pragma Import (C, intUnlock, "intUnlock"); begin return intUnlock; end Int_Unlock; ---------- -- 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; --------------- -- Task_Cont -- --------------- function Task_Cont (tid : t_id) return int is function taskResume (tid : t_id) return int; pragma Import (C, taskResume, "taskResume"); begin return taskResume (tid); end Task_Cont; --------------- -- Task_Stop -- --------------- function Task_Stop (tid : t_id) return int is function taskSuspend (tid : t_id) return int; pragma Import (C, taskSuspend, "taskSuspend"); begin return taskSuspend (tid); end Task_Stop; ----------------- -- 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 is negative 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 : 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;