Re: interrupt handing and the GUI (bug #37672)

[John W. Eaton]

On 11/10/2013 09:59 PM, Daniel J Sebald wrote:

>         
> http://pubs.opengroup.org/__onlinepubs/009695399/__functions/pthread_cond_signal.__html
>         
> <http://pubs.opengroup.org/onlinepubs/009695399/functions/pthread_cond_signal.html>
>
>
> OK, interesting read.  This is about blocked threads (which isn't
> the exact scenario) but I see your point about the asynchronous part
> of it.

If the condition variable could be set in a signal handler, then the
way it would be used is

  * start the calculation thread

  * stop the main thread, waiting for either the calculation thread to
    finish, or for a signal to occur.  The notification would come
    from a condition variable.

This approach would be better than polling, but would only work if it
is OK to set a condition variable in a signal handler, which
apparently it is not.

jwe