Date: Sun, 31 Jan 2010 19:08:55 -0600 From: Joe Lin <jlin@maxiscale.com> To: Pieter de Goeje <pieter@degoeje.nl>, "freebsd-java@freebsd.org" <freebsd-java@freebsd.org> Subject: RE: DatagramCahnnel scatter/gather problem on diablo 1.6.0_07-b02 Message-ID: <8B6860326495B2438DCBEA74AA981C7A78B220EE@MBX01.exg5.exghost.com> In-Reply-To: <201002010144.41376.pieter@degoeje.nl> References: <8B6860326495B2438DCBEA74AA981C7A78B220E0@MBX01.exg5.exghost.com> <201002010144.41376.pieter@degoeje.nl>
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Thanks for the reply. I looked at JDK source code and it appears that the JNI call should be in J2se/src/solaris/native/sun/nio/ch/DatagramDispatcher.c:write0(): There's only linux and solaris #ifdef but not for BSD. I wonder how/what BSD is calling. Since I'm getting a "IOException:Invalid argument" so I guess this should correspond to a EINVAL. And a sendmsg() in FreeBSD does not return an EINVAL. So the Diablo port must be calling a writev(). But I could not locate the source code. Wish I can find out what went wrong with dialblo VM. Thanks. -----Original Message----- From: Pieter de Goeje [mailto:pieter@degoeje.nl] Sent: Sunday, January 31, 2010 4:45 PM To: freebsd-java@freebsd.org Cc: Joe Lin Subject: Re: DatagramCahnnel scatter/gather problem on diablo 1.6.0_07-b02 On Monday 01 February 2010 01:01:38 Joe Lin wrote: > Hi I wrote a sample program trying to use > DatagramChannel.write(ByteBuffer[] bufs). The exact same code works on > Windows and Linux. But it fails on the Diablo VM under FreeBSD 7.0 64 bit. > The exception: > > Exception in thread "main" java.io.IOException: Invalid argument > at sun.nio.ch.DatagramDispatcher.writev0(Native Method) > at sun.nio.ch.DatagramDispatcher.writev(DatagramDispatcher.java:37) > at sun.nio.ch.IOUtil.write(IOUtil.java:164) > at > sun.nio.ch.DatagramChannelImpl.write0(DatagramChannelImpl.java:414) at > sun.nio.ch.DatagramChannelImpl.write(DatagramChannelImpl.java:431) at > java.nio.channels.DatagramChannel.write(DatagramChannel.java:418) at > coco.McastSender.main(McastSender.java:68). I can confirm it also doesn't work on FreeBSD 8/i386 and amd64 using jdk6 or openjdk6. I find it odd why it works on Linux because they have exactly the same writev(2) as we do. Scatter/gather I/O isn't very often used so I guess you're the first one that has run into this problem. -- Pieter de Goeje No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2649 - Release Date: 01/30/10 22:39:00home | help
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