Re: [PATCH v2 1/1] index-pack: Disable threading on cygwin

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On Wed, Jun 27, 2012 at 12:37 AM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> Erik Faye-Lund <kusmabite@xxxxxxxxx> writes:
>
>> On Tue, Jun 26, 2012 at 9:56 PM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
>>> Ramsay Jones <ramsay@xxxxxxxxxxxxxxxxxxx> writes:
>>>
>>>>    - renamed FAKE_PREAD_NOT_THREAD_SAFE to NO_THREAD_SAFE_PREAD
>>>
>>> Sensible.
>>>
>>>>    - when NO_PREAD, set NO_THREAD_SAFE_PREAD in the Makefile, rather
>>>>      than in git-compat-util.h
>>>
>>> I think it is a bad change.  When compat/ pread gets improved to be
>>> thread-safe, this will surely be missed.
>>
>> But CAN it be fixed? I don't think it could, at least not without
>> wrapping ALL calls to functions that perform IO on file handles or
>> file descriptors...
>
> Is that relevant?  It may be true that both Erik and Junio are not
> being clever enough to come up with a solution offhand.  But is that
> a good justification to go against a sound engineering practice?
>

I didn't really mean to argue for or against this particular solution,
sorry if I was unclear. I'm more interested in actually fixing the
issue without disabling threading ;)

At least on Windows, the CRT actually does take a lock for the
file-handle for all standard IO opterations. Perhaps we can somehow
take it ourselves? I'm not entirely sure how to get hold of it, but it
would probably require quite a deep-dive into the CRT sources...
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