test/exceptiontest2.c

   1 /*
   2     Copyright © 1995-2007, The AROS Development Team.
   3     $Id$
   4
   5     Desc: Task exception test adapted from tasktest.
   6     Lang: english
   7 */
   8
   9 #include <proto/alib.h>
  10 #include <proto/exec.h>
  11 #include <exec/tasks.h>
  12 #include <stdio.h>
  13
  14 int           cnt;
  15 int           excbit;
  16 int           sigbit1;
  17 int           sigbit2;
  18 struct Task * parent;
  19
  20 #define STACKSIZE 4096
  21
  22 static ULONG handler(
  23     ULONG             signals,
  24     APTR              data,
  25     struct ExecBase * SysBase)
  26 {
  27     printf("exception handler called\n");
  28     /* this call of Signal will not call the handler
  29        again, because the signals handled are disabled
  30        during handler execution, we could even avoid
  31        excbit from being restored after handling with:
  32        signals ^= 1 << excbit */
  33     Signal(parent, 1 << sigbit1);
  34     return signals;
  35 }
  36
  37 static void entry(void)
  38 {
  39     sigbit2 = AllocSignal(-1);
  40     /* signal the parent task via a task exceptions */
  41     Signal(parent, 1 << excbit);
  42     if (sigbit2 >= 0)
  43     {
  44         int i;
  45
  46         for (i = 0; i < 9; i++)
  47         {
  48             Wait(1 << sigbit2);
  49             cnt++;
  50         }
  51         for (i = 0; i < 10000; i++)
  52             cnt++;
  53
  54         FreeSignal(sigbit2);
  55     }
  56
  57     Wait(0); /* Let the parent remove me */
  58 }
  59
  60 int main(int argc, char* argv[])
  61 {
  62     parent = FindTask(NULL);
  63
  64     excbit  = AllocSignal(-1);
  65     sigbit1 = AllocSignal(-1);
  66     if (excbit >= 0 && sigbit1 >= 0)
  67     {
  68         APTR oldexc           = parent->tc_ExceptCode;
  69         parent->tc_ExceptCode = &handler;
  70         /* call handler on excbit */
  71         SetExcept(1 << excbit, 1 << excbit);
  72
  73         struct Task * t = CreateTask("new task", 1, &entry, STACKSIZE);
  74         if (t != NULL)
  75         {
  76             Wait(1 << sigbit1);
  77             /* we only want to get exceptioned once not on
  78                every new call to Signal, so disable excbit */
  79             SetExcept(0, 1 << excbit);
  80             if (sigbit2 >= 0)
  81             {
  82                 int i;
  83                 for (i = 0; i < 10; i++)
  84                 {
  85                     Signal(t, 1 << sigbit2);
  86                     printf("%d\n", cnt);
  87                 }
  88             }
  89             DeleteTask(t);
  90         }
  91
  92         parent->tc_ExceptCode = oldexc;
  93         FreeSignal(excbit);
  94         FreeSignal(sigbit1);
  95     }
  96     return 0;
  97 }