Calling ada code from non Ada threads

Calling ada code from non Ada threads

[andy_starritt]

Hi all,

   I'm writing a binding to a shared library written in c. Part
of the API specification allows for a call back procedure
to called later when some event occurs.

   The call back is in a thread created by the shared library,
and this causes a segmentation fault if I try to do anything
'significant' in the Ada code (even a simple Ada.Text_IO.Put_Line is
problematic). If I just copy the
call back procedure parameter data to a package
level variable all is okay.

   Is there any way to let the Ada know and/or be 'happy' with code
being invoked in a non Ada thread?

BtW using Linux Red Hat 9 and RH Enterprise 3.0

Cheers

Re: Calling ada code from non Ada threads

[Marc A. Criley]

andy_starritt@hotmail.com wrote:

>    The call back is in a thread created by the shared library,
> and this causes a segmentation fault if I try to do anything
> 'significant' in the Ada code (even a simple Ada.Text_IO.Put_Line is
> problematic). If I just copy the
> call back procedure parameter data to a package
> level variable all is okay.
> 
>    Is there any way to let the Ada know and/or be 'happy' with code
> being invoked in a non Ada thread?
> 
> BtW using Linux Red Hat 9 and RH Enterprise 3.0

What compiler are you using?  Gnat 3.15p?  If you are, are you aware of 
the tasking problem interacting with threads on RH 9?  I know you're 
working with "threads", but perhaps it's related?

See http://www.mckae.com/dtq_common/README.RedHat9 for more info.

-- Marc A. Criley
-- McKae Technologies
-- www.mckae.com
-- DTraq - XPath In Ada - XML EZ Out

Re: Calling ada code from non Ada threads

[Simon Wright]

andy_starritt@hotmail.com writes:

>    Is there any way to let the Ada know and/or be 'happy' with code
> being invoked in a non Ada thread?

Check out GNAT.Threads.