Re: Automatic Refresh for local Maildir's mail cou nts?

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Linux-Fan writes:

> > If you do not have a folder open, but looking at the folder
> > hierarchy, the message counts are not going to get updated in
> > realtime. There's no facility to do that.
>
> Ah OK, that's it: I misunderstood the meaning of ``open'' thinking it
> was enough to view the folder hierarchy instead of looking at the actual
> folder contents. The updates for the folder currently opened in a sense
> that the contents are displayed work well (see above).
>
> Is it possible/planned to add a means of updating the message counts
> from the folder hierarchy view automatically as well (similar to what
> I did upon receiving a SIGUSR1 for my proof-of-concept patch from the
> previous mail)?

I'm open to such a feature; however this approach won't work. Signals are  
asynchronous, and none of the high levels function that the handler invokes  
are async-safe. If cone is doing nothing but polling for the next event,  
it'll work fine. If cone is in the middle of something, there's a high  
likelyhood of a crash. And if cone is not displaying the folder hierarchy,  
this is pretty much a guaranteed crash.

The only safe way to do this: in addition to installing a signal handler, an  
internal pipe needs to be created, and put into nonblocking mode. The only  
thing the signal handler does is write a byte to the pipe, ignoring the  
results, and immediately terminating.

Then, on the folder screen only, in addition to handling all the regular  
events the read end of the pipe gets polled as well, and when something is  
read, what your patch does would happen.

Even with that, things may not work 100%. All the code needs to be audited  
and verified that it'll correctly handle an interrupted system call.

Correct signal handling is hard.


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