[ECOS] Max number of priorities using mlqueue scheduler

[Jonathan Larmour]

Nick Garnett wrote:
> Nick Garnett <nickg@ecoscentric.com> writes:
> 
> 
>>What's needed is to add a two-level bitmap. This is something I
>>started working on some time ago, but other commitments meant that it
>>was sidelined. Also, this is a fundamental change to the eCos
>>scheduler. It's something I would only be happy checking in to an
>>experimental branch for prolonged testing. Putting it straight into
>>the CVS repository is a big risk.
>>
> 
> 
> Daniel,
> 
> If you are interested in living on the edge, I have dusted off the
> two-level bitmap stuff I mentioned. I have only tested it on a few of the
> more thread-intensive kernel tests, and only with 32 and 1024 priority
> levels. No guarantees.

I wouldn't be so hesitant at checking it into the trunk... the fun only 
starts when you set the priorities greater than 32. Bear this feature in 
mind for a test farm permutation though :-).

One comment is that of course if we have 64 bit primitives available 
anyway on an architecture, we should consider using those directly.

Jifl
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