Re: Any tips for debugging a GNAT tasking implementation problem?

[Laurent GUERBY <laurent at guerby dot net>]

Hi,

I'd say from the symptoms tasking doesn't work at all, could you try
with a simpler testcase:

-- begin tt.adb
with Ada.Text_IO; use Ada.Text_IO;
procedure TT is
   task T;
   task body T is
   begin
      Put_Line ("task");
   end;
begin
   Put_Line ("main");
end;
-- end tt.adb

To my knowledge once "created" an Ada task will immediately start
executing user program code with magic synchronization lock.

Sincerely,

Laurent

On Fri, 2009-09-25 at 03:47 +0100, Dave Korn wrote:
> Hi all,
> 
>   Over on the cygwin-improvements branch(*) I've got a fairly nifty fully
> POSIX-based port of Ada, but there's one FAIL on the gnat testsuite that I'm
> trying to debug.  It could be a bug in the port, or the testcase might have
> stressed an underlying bug in Cygwin's pthread functions.  I'm hoping to get
> some pointers to help me understand the architecture of the tasking control in
> GNAT.
> 
>   The failing case is gnat.dg/task_stack_align.adb, which fails like so:
> 
> > $ ./task_stack_align.exe
> > 
> > raised TASKING_ERROR : Failure during activation
> > 
> > $