Path: csiph.com!x330-a1.tempe.blueboxinc.net!newsfeed.hal-mli.net!feeder3.hal-mli.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!border3.nntp.dca.giganews.com!Xl.tags.giganews.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local2.nntp.dca.giganews.com!nntp.earthlink.com!news.earthlink.com.POSTED!not-for-mail NNTP-Posting-Date: Fri, 22 Jul 2011 11:30:49 -0500 Date: Fri, 22 Jul 2011 09:30:47 -0700 From: Patricia Shanahan User-Agent: Mozilla/5.0 (Windows NT 5.2; WOW64; rv:5.0) Gecko/20110624 Thunderbird/5.0 MIME-Version: 1.0 Newsgroups: comp.lang.java.programmer Subject: Re: Why "lock" functionality is introduced for all the objects? References: <4e28c4c4$0$308$14726298@news.sunsite.dk> <4e298683$0$315$14726298@news.sunsite.dk> In-Reply-To: <4e298683$0$315$14726298@news.sunsite.dk> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Message-ID: Lines: 26 X-Usenet-Provider: http://www.giganews.com NNTP-Posting-Host: 70.230.200.239 X-Trace: sv3-IVmvaoNkeEhIm21LV8omiFzeI/B/fhxNr6hAIoMuWBDNz+scrSeDh+Fz94xxKwwz6Z4ahzFOJ2NULhE!Y4ETyPmcFBnrE7R2E5f+Wsp4kSwMkpmcC9DfYTiEcdPqDxQ1phTNvXy8P1yCXrp/wFJywUXDf+or!/j0TfzhT8hpXzr0zO+RYQKZOdei4eDSVN0Uz9nGJqWTJRAE= X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 X-Original-Bytes: 2521 Xref: x330-a1.tempe.blueboxinc.net comp.lang.java.programmer:6402 On 7/22/2011 7:17 AM, Arne Vajhøj wrote: > On 7/22/2011 12:20 AM, Henderson wrote: >> On 21/07/2011 8:30 PM, Arne Vajhøj wrote: >>> On 6/30/2011 6:04 PM, Tom Anderson wrote: >>>> On Tue, 28 Jun 2011, Alex J wrote: >>>>> The better decision, IMHO, would be to introduce lock/wait mechanics >>>>> for only, say, the Lockable descendants. >>>> >>>> I agree with this, actually. There might be some small performance >>>> improvement, but it would also make the locking behaviour of code more >>>> explicit, and so clearer. >>> >>> Given that Java does not allow multiple inheritance then that would >>> have been tough restriction. >> >> Others suggested that Lockable could have been a marker interface with >> special significance to the compiler, ala Serializable. Java allows >> multiple inheritance of interfaces. > > It could be, but does that provide any space in the data structure? Compiler magic. Just as the compiler reacts the lack of any constructor by generating a default constructor, it would react to the Lockable interface by generating a field to contain the lock data. Patricia