What's "io/nonblock"

ruby-talk
1

Ara’s “session” package tries to require ‘io/nonblock’ and fails on my
machine. Google reveals nothing very instructive. Anyone know what
it is?

Thanks,
Gavin

2

Chad Fowler knows what it is, and told me it’s standard with 1.8.
Yippee. I reinstalled Ruby (latest CVS 1.8 branch), even though my
existing Ruby was not yet one month old, and here is the relevant
section from the output:

installing io/wait
make[1]: Entering directory /home/gavin/Projects/ruby18/ext/io/wait' make[1]: Nothing to be done for install’.
make[1]: Leaving directory `/home/gavin/Projects/ruby18/ext/io/wait’

Problem, that.

Cheers,
Gavin

···

On Friday, April 16, 2004, 10:50:55 PM, Gavin wrote:

Ara’s “session” package tries to require ‘io/nonblock’ and fails on my
machine. Google reveals nothing very instructive. Anyone know what
it is?

3

A problem, perhaps, but io/nonblock.rb is installed from
ext/io/wait/lib/, and is, as its name suggests, a plain Ruby file. It
doesn’t appear to require io/wait, either, so you should be okay with
just installing it by itself to get ‘session’ working.

···

On Apr 16, 2004, at 7:15 AM, Gavin Sinclair wrote:

On Friday, April 16, 2004, 10:50:55 PM, Gavin wrote:

Ara’s “session” package tries to require ‘io/nonblock’ and fails on my
machine. Google reveals nothing very instructive. Anyone know what
it is?

[…]
installing io/wait
make[1]: Entering directory /home/gavin/Projects/ruby18/ext/io/wait' make[1]: Nothing to be done for install’.
make[1]: Leaving directory `/home/gavin/Projects/ruby18/ext/io/wait’

Problem, that.

–
Michael Granger ged@FaerieMUD.org
Rubymage, Believer, Architect
The FaerieMUD Consortium http://www.FaerieMUD.org/

4

would do - but i require io/wait as well. the truth is i currently don’t
really need both: my original design used nonblock, but this is broken in
threads, the lastest uses IO.ready?, which you get from io/wait:

from the source

# this is the desired call - but threads block on it! #iodat[:io].nonblock{ buf = iodat[:io].read } 
    # 2.1.5 
      #sleep(0.042) and Thread.pass until iodat[:io].ready?
      #buf << iodat[:io].getc while iodat[:io].ready?

    # 2.1.6
    # decided to go ahead and read lines since
    # - loop only terminates when cmd_end_pat has been found and this
    #   must be newline terminated
    # - although this will block mid-line in the case of parital lines we
    #   know that, eventually, a newline will appear and this delay is
    #   acceptable so we can make larger (line buffered) reads instead of
    #   character ones.  eventually i'd like to use io.nonblock{} to read 
    #   'as much as is there' but this does not play well with threads at the
    #   moment
      buf << iodat[:io].gets while iodat[:io].ready?

the semantics i’d like to have are ‘read as much data as is possible, even a
single character, but don’t block on the read’. this is what

iodat[:io].nonblock{ buf = iodat[:io].read }

should do. but in a thread it blocks. there was a few postings on this 2
months ago by me, nobu i think, and tanaka akira if you feel like searching…

in any case = you could acutally commnet out the ‘require “io/nonblock”’ and
it would be fine. but i hope to use this in future versions…

weird that you were lacking it - my old 18 seems to have it…

oh well.

cheers.

-a

···

On Fri, 16 Apr 2004, Michael Granger wrote:

On Apr 16, 2004, at 7:15 AM, Gavin Sinclair wrote:

On Friday, April 16, 2004, 10:50:55 PM, Gavin wrote:

Ara’s “session” package tries to require ‘io/nonblock’ and fails on my
machine. Google reveals nothing very instructive. Anyone know what
it is?

[…]
installing io/wait
make[1]: Entering directory /home/gavin/Projects/ruby18/ext/io/wait' make[1]: Nothing to be done for install’.
make[1]: Leaving directory `/home/gavin/Projects/ruby18/ext/io/wait’

Problem, that.

A problem, perhaps, but io/nonblock.rb is installed from
ext/io/wait/lib/, and is, as its name suggests, a plain Ruby file. It
doesn’t appear to require io/wait, either, so you should be okay with
just installing it by itself to get ‘session’ working.

–

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