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From: Dennis Miller <"DenMiller<!spam>"@home.com>
Subject: Tasking Error Causing SIGILL
Date: 1999/09/05
Message-ID: <37D1D790.EDD57617@home.com>#1/1
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Date: 1999-09-05T00:00:00+00:00
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I have a task type that acts as a semaphore for a buffer list.  The
entry points for the task are Start, Seize, Release, and Stop.  The task
body looks something like this:

   task body Semaphore
      Boolean busy; 
      Boolean complete;
   begin
      accept Start
         select
            when not Busy =>
               accept Seize do
                 busy = true;

         or accept Release
            busy = false; 

         or when not Busy =>
               accept Stop do
                 complete = true;
         end select;

     -- CAN'T REMEMBER THE LINE OF CODE THAT GOES HERE
      
   end Semaphore;
         


My code is compiled on Solaris 7 using the VADS 6.2.3c compiler and AXI
Bindings from ATC (version 3.2).

My problem is I get a SIGILL error when I try to clear the buffer. 
Could this problem be caused because a task called Seize, Release, or
Stop before Start has been called?  When I checked the tasks running, I
have two suspended at select and two more suspended at fast select
(sorry...I'm at home and I was writing this at work).

--Dennis-