[Python-Dev] PEP 3147: PYC Repository Directories

[Barry Warsaw]

On Jan 31, 2010, at 08:10 PM, Silke von Bargen wrote:

>Martin v. Löwis schrieb:
>> There is also the issue of race conditions with multiple simultaneous
>> accesses. The original format for the PEP had race conditions for
>> multiple simultaneous writers; ZIP will also have race conditions for
>> concurrent readers/writers (as any new writer will have to overwrite
>> the central directory, making the zip file temporarily unavailable -
>> unless they copy it, in which case we are back to writer/writer
>> races).
>>
>> Regards,
>> Martin
>>
>>   
>Good point. OTOH the probability for this to happen actually is very small.

And yet, when it does happen, it's probably a monster to debug and defend
against.   Unless we have a convincing cross-platform story for preventing
these race conditions, I think a single-file (e.g. zipfile) approach is
infeasible.

-Barry
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