gcc/ada/s-osinte-vxworks.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                  GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                --
   4 --                                                                          --
   5 --                   S Y S T E M . O S _ I N T E R F A C E                  --
   6 --                                                                          --
   7 --                                   B o d y                                --
   8 --                                                                          --
   9 --         Copyright (C) 1997-2011, Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNARL was developed by the GNARL team at Florida State University.       --
  28 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This is the VxWorks version
  33
  34 --  This package encapsulates all direct interfaces to OS services that are
  35 --  needed by children of System.
  36
  37 pragma Polling (Off);
  38 --  Turn off polling, we do not want ATC polling to take place during tasking
  39 --  operations. It causes infinite loops and other problems.
  40
  41 package body System.OS_Interface is
  42
  43    use type Interfaces.C.int;
  44
  45    Low_Priority : constant := 255;
  46    --  VxWorks native (default) lowest scheduling priority
  47
  48    -------------
  49    -- sigwait --
  50    -------------
  51
  52    function sigwait
  53      (set : access sigset_t;
  54       sig : access Signal) return int
  55    is
  56       Result : int;
  57
  58       function sigwaitinfo
  59         (set : access sigset_t; sigvalue : System.Address) return int;
  60       pragma Import (C, sigwaitinfo, "sigwaitinfo");
  61
  62    begin
  63       Result := sigwaitinfo (set, System.Null_Address);
  64
  65       if Result /= -1 then
  66          sig.all := Signal (Result);
  67          return OK;
  68       else
  69          sig.all := 0;
  70          return errno;
  71       end if;
  72    end sigwait;
  73
  74    -----------------
  75    -- To_Duration --
  76    -----------------
  77
  78    function To_Duration (TS : timespec) return Duration is
  79    begin
  80       return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9;
  81    end To_Duration;
  82
  83    -----------------
  84    -- To_Timespec --
  85    -----------------
  86
  87    function To_Timespec (D : Duration) return timespec is
  88       S : time_t;
  89       F : Duration;
  90
  91    begin
  92       S := time_t (Long_Long_Integer (D));
  93       F := D - Duration (S);
  94
  95       --  If F is negative due to a round-up, adjust for positive F value
  96
  97       if F < 0.0 then
  98          S := S - 1;
  99          F := F + 1.0;
 100       end if;
 101
 102       return timespec'(ts_sec  => S,
 103                        ts_nsec => long (Long_Long_Integer (F * 10#1#E9)));
 104    end To_Timespec;
 105
 106    -------------------------
 107    -- To_VxWorks_Priority --
 108    -------------------------
 109
 110    function To_VxWorks_Priority (Priority : int) return int is
 111    begin
 112       return Low_Priority - Priority;
 113    end To_VxWorks_Priority;
 114
 115    --------------------
 116    -- To_Clock_Ticks --
 117    --------------------
 118
 119    --  ??? - For now, we'll always get the system clock rate since it is
 120    --  allowed to be changed during run-time in VxWorks. A better method would
 121    --  be to provide an operation to set it that so we can always know its
 122    --  value.
 123
 124    --  Another thing we should probably allow for is a resultant tick count
 125    --  greater than int'Last. This should probably be a procedure with two
 126    --  output parameters, one in the range 0 .. int'Last, and another
 127    --  representing the overflow count.
 128
 129    function To_Clock_Ticks (D : Duration) return int is
 130       Ticks          : Long_Long_Integer;
 131       Rate_Duration  : Duration;
 132       Ticks_Duration : Duration;
 133
 134    begin
 135       if D < 0.0 then
 136          return ERROR;
 137       end if;
 138
 139       --  Ensure that the duration can be converted to ticks
 140       --  at the current clock tick rate without overflowing.
 141
 142       Rate_Duration := Duration (sysClkRateGet);
 143
 144       if D > (Duration'Last / Rate_Duration) then
 145          Ticks := Long_Long_Integer (int'Last);
 146       else
 147          Ticks_Duration := D * Rate_Duration;
 148          Ticks := Long_Long_Integer (Ticks_Duration);
 149
 150          if Ticks_Duration > Duration (Ticks) then
 151             Ticks := Ticks + 1;
 152          end if;
 153
 154          if Ticks > Long_Long_Integer (int'Last) then
 155             Ticks := Long_Long_Integer (int'Last);
 156          end if;
 157       end if;
 158
 159       return int (Ticks);
 160    end To_Clock_Ticks;
 161
 162    -----------------------------
 163    -- Binary_Semaphore_Create --
 164    -----------------------------
 165
 166    function Binary_Semaphore_Create return Binary_Semaphore_Id is
 167    begin
 168       return Binary_Semaphore_Id (semBCreate (SEM_Q_FIFO, SEM_EMPTY));
 169    end Binary_Semaphore_Create;
 170
 171    -----------------------------
 172    -- Binary_Semaphore_Delete --
 173    -----------------------------
 174
 175    function Binary_Semaphore_Delete (ID : Binary_Semaphore_Id) return int is
 176    begin
 177       return semDelete (SEM_ID (ID));
 178    end Binary_Semaphore_Delete;
 179
 180    -----------------------------
 181    -- Binary_Semaphore_Obtain --
 182    -----------------------------
 183
 184    function Binary_Semaphore_Obtain (ID : Binary_Semaphore_Id) return int is
 185    begin
 186       return semTake (SEM_ID (ID), WAIT_FOREVER);
 187    end Binary_Semaphore_Obtain;
 188
 189    ------------------------------
 190    -- Binary_Semaphore_Release --
 191    ------------------------------
 192
 193    function Binary_Semaphore_Release (ID : Binary_Semaphore_Id) return int is
 194    begin
 195       return semGive (SEM_ID (ID));
 196    end Binary_Semaphore_Release;
 197
 198    ----------------------------
 199    -- Binary_Semaphore_Flush --
 200    ----------------------------
 201
 202    function Binary_Semaphore_Flush (ID : Binary_Semaphore_Id) return int is
 203    begin
 204       return semFlush (SEM_ID (ID));
 205    end Binary_Semaphore_Flush;
 206
 207    ----------
 208    -- kill --
 209    ----------
 210
 211    function kill (pid : t_id; sig : Signal) return int is
 212    begin
 213       return System.VxWorks.Ext.kill (pid, int (sig));
 214    end kill;
 215
 216    -----------------------
 217    -- Interrupt_Connect --
 218    -----------------------
 219
 220    function Interrupt_Connect
 221      (Vector    : Interrupt_Vector;
 222       Handler   : Interrupt_Handler;
 223       Parameter : System.Address := System.Null_Address) return int is
 224    begin
 225       return
 226         System.VxWorks.Ext.Interrupt_Connect
 227         (System.VxWorks.Ext.Interrupt_Vector (Vector),
 228          System.VxWorks.Ext.Interrupt_Handler (Handler),
 229          Parameter);
 230    end Interrupt_Connect;
 231
 232    -----------------------
 233    -- Interrupt_Context --
 234    -----------------------
 235
 236    function Interrupt_Context return int is
 237    begin
 238       return System.VxWorks.Ext.Interrupt_Context;
 239    end Interrupt_Context;
 240
 241    --------------------------------
 242    -- Interrupt_Number_To_Vector --
 243    --------------------------------
 244
 245    function Interrupt_Number_To_Vector
 246      (intNum : int) return Interrupt_Vector
 247    is
 248    begin
 249       return Interrupt_Vector
 250         (System.VxWorks.Ext.Interrupt_Number_To_Vector (intNum));
 251    end Interrupt_Number_To_Vector;
 252
 253    -----------------
 254    -- Current_CPU --
 255    -----------------
 256
 257    function Current_CPU return Multiprocessors.CPU is
 258    begin
 259       --  ??? Should use vxworks multiprocessor interface
 260
 261       return Multiprocessors.CPU'First;
 262    end Current_CPU;
 263
 264 end System.OS_Interface;