Experimental Physics and
Industrial Control System

Chris Timossi <[email protected]> · Wed, 21 Jul 2004 09:33:44 -0700

To be honest, I dont know if it's safe for a signal handler to join a
thread context. There's at least one possible race condition in this
case: the signal handler could execute after ca_task_exit() has been
called. What other race conditions are you thinking about?
I'm sure Jeff will weigh in when he gets back.
Chris Timossi
Eric Norum wrote:
Robert Soliday wrote:
Thanks, this solved my problem.
--Bob
Chris Timossi wrote:
Robert,
I believe that you should replace ca_task_initialize with

 > ca_context_create(ca_enable_preemptive_callback) in main. Then in the
 > interrupt handler, you can call ca_current_context() to get the
 > current context and finally join that context with
 > ca_attach_context().

Are you sure that this is safe? I suspect that calling these
functions from a signal handler is going to introduce all sorts of
race conditions.
Jeff -- can you confirm/deny my suspicions?

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System