On Wed, Feb 12, 2014 at 3:59 AM, Erik Faye-Lund <kusmab...@gmail.com> wrote:
> On Wed, Feb 12, 2014 at 2:54 AM, Stefan Zager <sza...@chromium.org> wrote:
>> We are particularly concerned with the performance of msysgit, and we
>> have already chalked up a significant performance gain by turning on
>> the threading code in pack-objects (which was already enabled for
>> posix platforms, but not on msysgit, owing to the lack of a correct
>> pread implementation).
> How did you manage to do this? I'm not aware of any way to implement
> pread on Windows (without going down the insanity-path of wrapping and
> potentially locking inside every IO operation)...
I don't want to steal the thunder of my coworker, who wrote the
implementation. He plans to submit it upstream soon-ish. It relies
on using the lpOverlapped argument to ReadFile(), with some additional
tomfoolery to make sure that the implicit position pointer for the
file descriptor doesn't get modified.
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