[m-rev.] for review: hang in lowlevel parallel grade

[Julien Fischer]

On Wed, 28 Jun 2006, Peter Wang wrote:

>
> Estimated hours taken: 6
> Branches: main, release
>
> This patch fixes a bug with lowlevel parallel grades.  A program built in such
> a grade could hang when running with multiple threads.
>
> runtime/mercury_context.c:
> 	After scheduling a Mercury context, use MR_BROADCAST to wake up all
> 	idle threads instead of MR_SIGNAL, if the newly scheduled context might
> 	not be accepted for execution by any single woken thread.  The hang
> 	used to occur when a context was scheduled but the wrong idle thread
> 	was woken up to execute it (because the context is 'owned' by another
> 	thread) and promptly went back to idling.
>
> runtime/mercury_thread.h:
> 	Add MR_BROADCAST macros.
>

Is there a test case for this?

Julien.
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