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Re: Threads and statics

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From	Eric Sosman <esosman@ieee-dot-org.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: Threads and statics
Date	Thu, 07 Apr 2011 21:14:49 -0400
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On 4/7/2011 8:34 AM, Dirk Bruere at NeoPax wrote:
> Is there a problem with multiple threads using the same static method of
> a class?

     No.  There's also no problem with multiple threads using the
same instance method of a class, or even of a particular instance.

     What matters is whether the methods use the same data.  Static
or instance, it's the data-sharing that requires synchronization or
other special handling -- conversely, it's the non-sharing that
requires no care at all.

     Advice that I found illuminating when first learning about
threading: Don't think about the code, think instead about the data
the code manipulates (more generally, about the "state" the code
manipulates).  Make sure the data is always seen in a consistent
state, except perhaps by the *one* thread that's in the act of
changing it; then you'll have a correct program.  (It might not be
the fastest possible program -- that's where the hard parts come
in -- but at least it won't have race conditions.)

-- 
Eric Sosman
esosman@ieee-dot-org.invalid

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Threads and statics Dirk Bruere at NeoPax <dirk.bruere@gmail.com> - 2011-04-07 13:34 +0100
  Re: Threads and statics Patricia Shanahan <pats@acm.org> - 2011-04-07 05:41 -0700
    Re: Threads and statics Robert Klemme <shortcutter@googlemail.com> - 2011-04-07 07:38 -0700
      Re: Threads and statics Lew <lew@lewscanon.com> - 2011-04-07 08:20 -0700
        Re: Threads and statics Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-04-07 18:47 -0300
  Re: Threads and statics markspace <-@.> - 2011-04-07 09:32 -0700
  Re: Threads and statics Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-04-07 21:14 -0400
    Re: Threads and statics Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-04-09 18:15 +0200
      Re: Threads and statics Lew <noone@lewscanon.com> - 2011-04-09 13:06 -0400
    Re: Threads and statics Patricia Shanahan <pats@acm.org> - 2011-04-09 09:29 -0700
    Re: Threads and statics Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2011-04-09 09:29 -0700
    Re: Threads and statics Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-04-09 14:57 -0400
      Re: Threads and statics "Mike Schilling" <mscottschilling@hotmail.com> - 2011-04-10 23:10 -0700
        Re: Threads and statics Tom Anderson <twic@urchin.earth.li> - 2011-04-11 13:25 +0100
          Re: Threads and statics Lew <noone@lewscanon.com> - 2011-04-11 08:58 -0400

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