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From "Tim Ellison (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5488) [classlib][nio] Scatter/gather calls should use OS functionality
Date Tue, 22 Apr 2008 14:28:21 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12591311#action_12591311
] 

Tim Ellison commented on HARMONY-5488:
--------------------------------------

No, I'm thinking more along the lines of extending the portlib with wrappers to native socket
and file IO functionality like readv and writev in unixes and equivalent functionality on
windows

http://msdn2.microsoft.com/en-us/library/ms740138(VS.85).aspx
http://msdn2.microsoft.com/en-us/library/aa365472.aspx


> [classlib][nio] Scatter/gather calls should use OS functionality
> ----------------------------------------------------------------
>
>                 Key: HARMONY-5488
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5488
>             Project: Harmony
>          Issue Type: Improvement
>          Components: Classlib
>            Reporter: Tim Ellison
>         Attachments: Harmony-5488.diff
>
>
> I just noticed that our NIO implementation of scatter / gather calls (e.g. o.a.h.nio.internal.SocketChannelImpl#write(ByteBuffer[],int,int))
are actually copying the data into a single Java heap buffer before calling the OS! :-(  and
FileChannelImpl copies into a single direct byte buffer.
> These need to be reimplemented in terms of the OS scatter/gather capabilities to avoid
copying.

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