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From "Martin Gainty" <mgai...@hotmail.com>
Subject Re: NIOSelector busy wait
Date Fri, 04 May 2007 00:09:14 GMT
curious what the value tcpSelectorTimeout is defines in 
%TOMCAT_HOME%/conf/server.xml

Bedankt/
Martin--
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----- Original Message ----- 
From: "Sebastiaan van Erk" <sebster@sebster.com>
To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Thursday, May 03, 2007 1:07 PM
Subject: NIOSelector busy wait


> Hi,
>
> I have a problem that sometimes the NIO selector goes into a busy wait 
> loop.
>
> In line 1430 the code of NIOEndpoint.java,
>
>                            keyCount = selector.select(selectorTimeout);
>
> select keeps returning 0 without waiting.
>
> I'm running on the latest trunk version of tomcat 6, on Ubuntu Linux 
> Feisty, with java version:
>
> java version "1.6.0"
> Java(TM) SE Runtime Environment (build 1.6.0-b105)
> Java HotSpot(TM) Server VM (build 1.6.0-b105, mixed mode)
>
> However, I've seen this same behavior with other JDK's (1.5).
>
> To me it seems that it's a bug in the JVM implementation because select 
> should only return 0 if it's woken up, which does not happen (since all 
> other threads are suspended in my debugger). However, I was wondering if 
> anybody else has seen this behavior and perhaps knows what's causing it in 
> the first place.
>
> Regards,
> Sebastiaan
>
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