Groups > comp.lang.java.programmer > #3499

Re: A question about synchronized threads

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From	Lew <noone@lewscanon.com>
Newsgroups	comp.lang.java.programmer
Subject	Re: A question about synchronized threads
Date	Wed, 04 May 2011 12:45:51 -0400
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On 05/03/2011 08:17 PM, Deeyana wrote:
> On Tue, 03 May 2011 18:57:19 -0400, Lew wrote:
>
>> byhesed wrote:
>>> I thought that synchronizing entire methods would be wasteful.
>>
>> Why?
>
> It is well known that shorter critical sections and finer lock
> granularity can increase concurrency, Lew.
>
>> Also, if two methods are "totally unrelated to each other" then you
>> don't need any synchronization at all.
>
> Classic unsubstantiated and erroneous claim. They may still need
> synchronization to prevent the simultaneous use of a) the SAME one by two
> different threads on the same object or b) one of them and some third
> method on the same object. But you may want an explicit lock object
> instead of the default effects of declaring the methods synchronized.
>
>> The single best, most effective way to optimize concurrent code is not
>> to share data.  The second-best way is to make shared-data immutable
>> (read-only).
>
> Clojure can help a lot with the latter.

Plonk, schmuck.

-- 
Lew
Honi soit qui mal y pense.
http://upload.wikimedia.org/wikipedia/commons/c/cf/Friz.jpg

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Thread

A question about synchronized threads byhesed <byhesed@gmail.com> - 2011-04-29 08:35 -0700
  Re: A question about synchronized threads Lew <noone@lewscanon.com> - 2011-04-29 11:53 -0400
    Re: A question about synchronized threads byhesed <byhesed@gmail.com> - 2011-04-29 09:12 -0700
      Re: A question about synchronized threads Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-04-29 21:01 -0400
        Re: A question about synchronized threads byhesed <byhesed@gmail.com> - 2011-04-29 18:43 -0700
  Re: A question about synchronized threads Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-04-29 17:58 +0200
    Re: A question about synchronized threads byhesed <byhesed@gmail.com> - 2011-04-29 09:09 -0700
      Re: A question about synchronized threads markspace <-@.> - 2011-04-29 11:11 -0700
        Re: A question about synchronized threads Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-04-29 20:19 +0200
          Re: A question about synchronized threads markspace <-@.> - 2011-04-29 15:21 -0700
          Re: A question about synchronized threads Patricia Shanahan <pats@acm.org> - 2011-04-29 21:10 -0700
  Re: A question about synchronized threads dagon@dagon.net (Dagon) - 2011-04-29 15:55 -0700
    Re: A question about synchronized threads Alice <quaxx1108@example.com> - 2011-04-29 20:08 -0400
    Re: A question about synchronized threads markspace <-@.> - 2011-04-29 19:07 -0700
    Re: A question about synchronized threads byhesed <byhesed@gmail.com> - 2011-04-29 18:49 -0700
      Re: A question about synchronized threads Lew <noone@lewscanon.com> - 2011-05-03 18:57 -0400
        Re: A question about synchronized threads Deeyana <d.awlberg@hotmail.invalid> - 2011-05-04 00:17 +0000
          Re: A question about synchronized threads Lew <noone@lewscanon.com> - 2011-05-04 12:45 -0400
            Re: A question about synchronized threads Deeyana <d.awlberg@hotmail.invalid> - 2011-05-04 19:59 +0000

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