------------------------------------------------------------------------------ -- -- -- 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) 1997-2011, 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 -- -- . -- -- -- -- 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 OK; 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 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 ERROR; 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; ----------------------------- -- Binary_Semaphore_Create -- ----------------------------- function Binary_Semaphore_Create return Binary_Semaphore_Id is begin return Binary_Semaphore_Id (semBCreate (SEM_Q_FIFO, SEM_EMPTY)); end Binary_Semaphore_Create; ----------------------------- -- Binary_Semaphore_Delete -- ----------------------------- function Binary_Semaphore_Delete (ID : Binary_Semaphore_Id) return int is begin return semDelete (SEM_ID (ID)); end Binary_Semaphore_Delete; ----------------------------- -- Binary_Semaphore_Obtain -- ----------------------------- function Binary_Semaphore_Obtain (ID : Binary_Semaphore_Id) return int is begin return semTake (SEM_ID (ID), WAIT_FOREVER); end Binary_Semaphore_Obtain; ------------------------------ -- Binary_Semaphore_Release -- ------------------------------ function Binary_Semaphore_Release (ID : Binary_Semaphore_Id) return int is begin return semGive (SEM_ID (ID)); end Binary_Semaphore_Release; ---------------------------- -- Binary_Semaphore_Flush -- ---------------------------- function Binary_Semaphore_Flush (ID : Binary_Semaphore_Id) return int is begin return semFlush (SEM_ID (ID)); end Binary_Semaphore_Flush; ---------- -- kill -- ---------- function kill (pid : t_id; sig : Signal) return int is begin return System.VxWorks.Ext.kill (pid, int (sig)); end kill; ----------------------- -- Interrupt_Connect -- ----------------------- function Interrupt_Connect (Vector : Interrupt_Vector; Handler : Interrupt_Handler; Parameter : System.Address := System.Null_Address) return int is begin return System.VxWorks.Ext.Interrupt_Connect (System.VxWorks.Ext.Interrupt_Vector (Vector), System.VxWorks.Ext.Interrupt_Handler (Handler), Parameter); end Interrupt_Connect; ----------------------- -- Interrupt_Context -- ----------------------- function Interrupt_Context return int is begin return System.VxWorks.Ext.Interrupt_Context; end Interrupt_Context; -------------------------------- -- Interrupt_Number_To_Vector -- -------------------------------- function Interrupt_Number_To_Vector (intNum : int) return Interrupt_Vector is begin return Interrupt_Vector (System.VxWorks.Ext.Interrupt_Number_To_Vector (intNum)); end Interrupt_Number_To_Vector; ----------------- -- Current_CPU -- ----------------- function Current_CPU return Multiprocessors.CPU is begin -- ??? Should use vxworks multiprocessor interface return Multiprocessors.CPU'First; end Current_CPU; end System.OS_Interface;