Re: nio + select!!

  Sweet!

  I will look and land tommorow unless I run into questions...Rails
work is dominating this evening...

-Tom
 
On Sat, 06 May 2006, Evan Buswell defenestrated me:

> I've got a working select now, and WEBrick::GenericServlet runs!  (There
> is an error about Fnctl missing, but it should be relatively harmless).  I
> haven't tested WEBrick's http stuff yet, but I suspect it more or less
> works.
> 
> Possible concerns about this implementation:
> 
> Java Selectors *require* that Channels (files, sockets...) be in
> non-blocking mode in order to correctly execute a select.  In order not to
> break any of the non-select code, I manually set all channels to
> nonblocking before the select, and manually set it back to blocking after
> the select.  What this means is that select is not thread safe, i.e. two
> threads can't select on the same socket at the same time without something
> possibly going wrong.  As select is usually used in order *not* to have a
> big threading mess, this shouldn't be a practical problem, but it is a
> theoretical limitation.
> 
> When, in the future, we support calls to set things nonblocking or
> blocking at will, it will be fairly easy to set up wrappers to return the
> socket to its default state instead of just arbitrarily making the socket
> block again.  There is some Java support to do this Thread-safely.
> 
> The real worry is what happens when one thread recv()s blocking while
> another thread select()s?  the recv *must* turn nonblocking or the select
> won't work, but that's not proper semantics (AFAIK).
> 
> Anyway, this should be good enough for 99% of code out there.
> 
> Patch attached, with changes:
> 
> * all the socket stuff in the socket patch from about a week ago
> * the nio stuff from a few days ago
> * select()
> * some extra constants defined in Socket::Constants to make WEBrick happy.
> 
> Evan


-- 
+ http://www.tc.umn.edu/~enebo +---- mailto:enebo-HInyCGIudOg@xxxxxxxxxxxxxxxx 
----+
| Thomas E Enebo, Protagonist  | "Luck favors the prepared    |
|                              |  mind." -Louis Pasteur       |


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