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From Pavel Pervov <pmcfi...@gmail.com>
Subject Re: [drlvm] Thread library function table added
Date Wed, 12 Aug 2009 11:45:24 GMT

This is great progress with threading library. Once the table
implementation is committed, we can move threading code inside harmony
vm module from the separate dynamic library, which will certainly give
us additional performance.


2009/8/11, Oliver Deakin <oliver.deakin@googlemail.com>:
> Hi all,
> I have added an implementation of the thread library function table for
> DRLVM which can be enabled by building with the "-Dhy.no.thr=true" flag
> specified on the Ant command line. This means we no longer need to build
> the classlib thread library in the federated build, and we also no
> longer need to copy the DRLVM hythr library into jre/bin (although I
> havn't changed the build to not do the copy yet). I have temporarily set
> the hythr library version to 0.2 so that the federated build can be run
> with and without the hy.no.thr flag set.
> This opens a couple of questions for discussion:
> 1) Shall we set the hy.no.thr option to true as default? I personally
> think we should - the classlib hythr library is not used in the
> federated builds, so there is no reason to continue building it.
> 2) Shall we remove the thread library from classlib altogether? If
> hy.no.thr=true becomes the default, I can see reasons for and against
> [1] removing the source from classlib, but I think the reasons to remove
> the code outweigh the reasons to keep it. My vote is to remove that
> source module from classlib altogether.
> Ideas/comments?
> Regards,
> Oliver
> [1] A few I can think of straight off:
> For:
>  - Unused thread library code in classlib is unlikely to be maintained.
>  - Some classlib thread code is incorrect (x86_64 linux has some invalid
> assembler code I believe).
>  - Shrinks the source tree footprint.
>  - All VMs will likely have their own implementation of this
> functionality anyway.
> Against:
>  - Raises the bar slightly for VM vendors wishing to use the Harmony
> class libraries.
> --
> Oliver Deakin
> Unless stated otherwise above:
> IBM United Kingdom Limited - Registered in England and Wales with number
> 741598.
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