Re: Proglem doing CA calls after catching a signal

[Chris Timossi <catimossi@lbl.gov>]

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?