From: Aaron Patterson <aaron@...>
Date: 2011-08-04T02:54:22+09:00
Subject: [ruby-core:38762] Re: [Ruby 1.9 - Bug #5138][Open] Add nonblocking IO that does not use exceptions for EOF and EWOULDBLOCK


--oC1+HKm2/end4ao3
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Wed, Aug 03, 2011 at 11:03:09PM +0900, Tanaka Akira wrote:
> 2011/8/2 Yehuda Katz <wycats@gmail.com>:
>=20
> > The current Ruby I/O classes have non-blocking methods (read_nonblock a=
nd write_nonblock). These methods will never block, and if they would block=
, they raise an exception instead (IO::WaitReadable or IO::WaitWritable). I=
n addition, if the IO is at EOF, they raise an EOFError.
> >
> > These exceptions are raised repeatedly in virtually every use of the no=
n-blocking methods. This patch adds a pair of methods (try_read_nonblock an=
d try_write_nonblock) that have the same semantics as the existing methods,=
 but they return Symbols instead of raising exceptions for these routine ca=
ses:
>=20
> I'm neutral about this proposal.
>=20
> Although the exceptions are not exceptional,
> they are very educational.

If the exceptions are not exceptional, that makes me wonder why are they
exceptions at all?  Since these aren't really exceptional cases, I would
prefer not to rescue.

As Alex pointed out, these exceptions really make $DEBUG noisy and that
also bugs me about the current behavior.

--=20
Aaron Patterson
http://tenderlovemaking.com/

--oC1+HKm2/end4ao3
Content-Type: application/pgp-signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (Darwin)

iQEcBAEBAgAGBQJOOYtDAAoJEJUxcLy0/6/G25sIAIGeZUyfvdlavV6CRc+NSh7d
qmjNIC4284htECvwkLRMwrH+sDh4ANS/CZ+yfqOKq3qduTb8jO1BIcPYAce/0Okh
RXQ3xjd5STDcA1gDBJNqsgWI9bcHSwBFCIb5nX+b2EwZCc6PEON60hPgrXb3T0Cj
LACYnNDno1OlykzSOl1oXV/N/KqO5ttp6Zbd+efpTRgw1Sj9/dl2MUgakS8CREWd
J3hyUcDBGLGmOY9ZmgXsFijzUUDVI+Dmxzl6GHZddbjF7/AEX5klj6soUq+eRLgj
+HkbB7IT2Ej5k0fXEr3z7yMTOZTnD1AKR6mjAdzfzs/w6Lwdo2IjXhkXsR+VEOE=
=CJ9G
-----END PGP SIGNATURE-----

--oC1+HKm2/end4ao3--