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Re: [PATCH 01/10] strbuf: Add strbuf_read_noblock

From
Stefan Beller <sbeller@google.com>
Date
Sep 17, 2015, 17:53 UTC
Message-ID
<CAGZ79kYKD6e=JmeFgbqHRmDAb1W3jraBayWHjA=-D+SXzubULw@mail.gmail.com>
In-Reply-To
<20150917175008.GA29601@sigill.intra.peff.net>
On Thu, Sep 17, 2015 at 10:50 AM, Jeff King <peff@peff.net> wrote:
Show 14 quoted lines
> On Thu, Sep 17, 2015 at 10:45:40AM -0700, Stefan Beller wrote:
>
>> > You _can_ loop on read until you hit EAGAIN, but I think in general you
>> > shouldn't; if you get a lot of input on this fd, you'll starve all of
>> > the other descriptors you're polling.  You're better off to read a
>> > finite amount from each descriptor, and then check again who is ready to
>> > read.
>>
>> That's what I do with the current implementation. Except it's not as clear and
>> concise as I patched it into the strbuf_read.
>
> Is it? I thought the implementation you posted bumped the existing
> strbuf_read to strbuf_buf_internal, including the loop. So as long as we
> are not getting EAGAIN, it will keep reading forever.

You'll get EAGAIN pretty fast though, as all you do is reading as fast as you can.

Show 5 quoted lines
> Actually not quite
> true, as any read shorter than 8192 bytes will cause us to jump out of
> the loop, too, but if we assume that the caller is feeding us data
> faster than we can read it, we'll never exit strbuf_read_nonblock() and
> serve any of the other descriptors.
I see the difference now. That makes sense.
>
> -Peff
Previous: Jeff KingNext: Junio C Hamano
Message 14 of 37 in “fetch submodules in parallel and a preview on parallel "submodule update"”
  1. 00/10 fetch submodules in parallel and a preview on parallel "submodule update"Stefan Beller, Sep 17, 2015
  2. 01/10 strbuf: Add strbuf_read_noblockStefan Beller, Sep 17, 2015
  3. Junio C HamanoSep 17, 2015
  4. Jeff KingSep 17, 2015
  5. Junio C HamanoSep 17, 2015
  6. Stefan BellerSep 17, 2015
  7. Jeff KingSep 17, 2015
  8. Junio C HamanoSep 17, 2015
  9. Jeff KingSep 17, 2015
  10. Stefan BellerSep 17, 2015
  11. Jeff KingSep 17, 2015
  12. Stefan BellerSep 17, 2015
  13. Jeff KingSep 17, 2015
  14. Stefan BellerSep 17, 2015
  15. Junio C HamanoSep 17, 2015
  16. Junio C HamanoSep 17, 2015
  17. Jeff KingSep 17, 2015
  18. Stefan BellerSep 17, 2015
  19. 02/10 run-command: factor out return value computationStefan Beller, Sep 17, 2015
  20. Jeff KingSep 17, 2015
  21. 03/10 run-command: add an asynchronous parallel child processorStefan Beller, Sep 17, 2015
  22. Junio C HamanoSep 17, 2015
  23. Stefan BellerSep 17, 2015
  24. Junio C HamanoSep 18, 2015
  25. Stefan BellerSep 18, 2015
  26. 04/10 fetch_populated_submodules: use new parallel job processingStefan Beller, Sep 17, 2015
  27. 05/10 submodules: Allow parallel fetching, add tests and documentationStefan Beller, Sep 17, 2015
  28. 06/10 git submodule update: Redirect any output to stderrStefan Beller, Sep 17, 2015
  29. Eric SunshineSep 17, 2015
  30. Stefan BellerSep 17, 2015
  31. 07/10 git submodule update: pass --prefix only with a non empty prefixStefan Beller, Sep 17, 2015
  32. Eric SunshineSep 17, 2015
  33. 08/10 git submodule update: cmd_update_recursiveStefan Beller, Sep 17, 2015
  34. 09/10 git submodule update: cmd_update_recursiveStefan Beller, Sep 17, 2015
  35. Eric SunshineSep 17, 2015
  36. 10/10 git submodule update: cmd_update_fetchStefan Beller, Sep 17, 2015
  37. Jacob KellerSep 17, 2015

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