David,

> On 26 Nov 2017, at 09:14, David Matthews <[email protected]> 
> wrote:
> 
> I don't see that myself but it's certainly possible.  A delay followed by 
> Error 1 suggests that it is relying on the crow-bar thread to stop. The fact 
> that this only happens on some platforms suggests a race condition.
> 
> In view of this I'm inclined to release the version without this change 
> (44b7b88) as 5.7.1 and investigate the problem later.

i’ve no objection to that as far as ProofPower is concerned, because the 
situation in the ProofPower build process where there a lots of little runs of 
Poly/ML is completely untypical of normal use of ProofPower. In normal use, a 
typical session is either an interactive session lasting hours or even days or 
a batch replay of a proof script that will take 10 seconds or more.

Regards,

Rob.
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