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jeremybenn |
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- S Y S T E M . O S _ I N T E R F A C E --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1997-2009, Free Software Foundation, Inc. --
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-- --
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-- GNARL is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. --
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-- Extensive contributions were provided by Ada Core Technologies, Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This is the VxWorks version
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-- This package encapsulates all direct interfaces to OS services that are
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-- needed by children of System.
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pragma Polling (Off);
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-- Turn off polling, we do not want ATC polling to take place during tasking
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-- operations. It causes infinite loops and other problems.
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package body System.OS_Interface is
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use type Interfaces.C.int;
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Low_Priority : constant := 255;
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-- VxWorks native (default) lowest scheduling priority
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-------------
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-- sigwait --
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-------------
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function sigwait
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(set : access sigset_t;
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sig : access Signal) return int
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is
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Result : int;
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function sigwaitinfo
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(set : access sigset_t; sigvalue : System.Address) return int;
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pragma Import (C, sigwaitinfo, "sigwaitinfo");
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begin
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Result := sigwaitinfo (set, System.Null_Address);
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if Result /= -1 then
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sig.all := Signal (Result);
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return OK;
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else
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sig.all := 0;
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return errno;
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end if;
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end sigwait;
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-----------------
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-- To_Duration --
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-----------------
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function To_Duration (TS : timespec) return Duration is
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begin
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return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;
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end To_Duration;
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-----------------
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-- To_Timespec --
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-----------------
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function To_Timespec (D : Duration) return timespec is
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S : time_t;
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F : Duration;
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begin
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S := time_t (Long_Long_Integer (D));
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F := D - Duration (S);
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-- If F is negative due to a round-up, adjust for positive F value
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if F < 0.0 then
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S := S - 1;
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F := F + 1.0;
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end if;
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return timespec'(ts_sec => S,
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ts_nsec => long (Long_Long_Integer (F * 10#1#E9)));
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end To_Timespec;
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-------------------------
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-- To_VxWorks_Priority --
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-------------------------
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function To_VxWorks_Priority (Priority : int) return int is
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begin
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return Low_Priority - Priority;
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end To_VxWorks_Priority;
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--------------------
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-- To_Clock_Ticks --
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--------------------
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-- ??? - For now, we'll always get the system clock rate since it is
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-- allowed to be changed during run-time in VxWorks. A better method would
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-- be to provide an operation to set it that so we can always know its
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-- value.
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-- Another thing we should probably allow for is a resultant tick count
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-- greater than int'Last. This should probably be a procedure with two
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-- output parameters, one in the range 0 .. int'Last, and another
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-- representing the overflow count.
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function To_Clock_Ticks (D : Duration) return int is
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Ticks : Long_Long_Integer;
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Rate_Duration : Duration;
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Ticks_Duration : Duration;
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begin
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if D < 0.0 then
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return ERROR;
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end if;
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-- Ensure that the duration can be converted to ticks
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-- at the current clock tick rate without overflowing.
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Rate_Duration := Duration (sysClkRateGet);
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if D > (Duration'Last / Rate_Duration) then
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Ticks := Long_Long_Integer (int'Last);
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else
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Ticks_Duration := D * Rate_Duration;
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Ticks := Long_Long_Integer (Ticks_Duration);
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if Ticks_Duration > Duration (Ticks) then
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Ticks := Ticks + 1;
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end if;
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if Ticks > Long_Long_Integer (int'Last) then
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Ticks := Long_Long_Integer (int'Last);
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end if;
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end if;
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return int (Ticks);
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end To_Clock_Ticks;
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-----------------------------
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-- Binary_Semaphore_Create --
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-----------------------------
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function Binary_Semaphore_Create return Binary_Semaphore_Id is
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begin
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return Binary_Semaphore_Id (semBCreate (SEM_Q_FIFO, SEM_EMPTY));
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end Binary_Semaphore_Create;
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-----------------------------
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-- Binary_Semaphore_Delete --
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-----------------------------
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function Binary_Semaphore_Delete (ID : Binary_Semaphore_Id) return int is
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begin
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return semDelete (SEM_ID (ID));
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end Binary_Semaphore_Delete;
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-----------------------------
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-- Binary_Semaphore_Obtain --
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-----------------------------
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function Binary_Semaphore_Obtain (ID : Binary_Semaphore_Id) return int is
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begin
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return semTake (SEM_ID (ID), WAIT_FOREVER);
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end Binary_Semaphore_Obtain;
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------------------------------
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-- Binary_Semaphore_Release --
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------------------------------
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function Binary_Semaphore_Release (ID : Binary_Semaphore_Id) return int is
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begin
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return semGive (SEM_ID (ID));
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end Binary_Semaphore_Release;
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----------------------------
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-- Binary_Semaphore_Flush --
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----------------------------
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function Binary_Semaphore_Flush (ID : Binary_Semaphore_Id) return int is
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begin
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return semFlush (SEM_ID (ID));
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end Binary_Semaphore_Flush;
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----------
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-- kill --
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----------
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function kill (pid : t_id; sig : Signal) return int is
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begin
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return System.VxWorks.Ext.kill (pid, int (sig));
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end kill;
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-----------------------
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-- Interrupt_Connect --
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-----------------------
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function Interrupt_Connect
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(Vector : Interrupt_Vector;
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Handler : Interrupt_Handler;
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Parameter : System.Address := System.Null_Address) return int is
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begin
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return
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System.VxWorks.Ext.Interrupt_Connect
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(System.VxWorks.Ext.Interrupt_Vector (Vector),
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System.VxWorks.Ext.Interrupt_Handler (Handler),
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Parameter);
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end Interrupt_Connect;
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--------------------------------
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-- Interrupt_Number_To_Vector --
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--------------------------------
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function Interrupt_Number_To_Vector
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(intNum : int) return Interrupt_Vector is
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begin
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return Interrupt_Vector
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(System.VxWorks.Ext.Interrupt_Number_To_Vector (intNum));
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end Interrupt_Number_To_Vector;
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end System.OS_Interface;
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