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Adam Spiers f1ed7fea79 Documentation: add caveats about I/O buffering for check-{attr,ignore}
check-attr and check-ignore have the potential to deadlock callers
which do not read back the output in real-time.  For example, if a
caller writes N paths out and then reads N lines back in, it risks
becoming blocked on write() to check-*, and check-* is blocked on
write back to the caller.  Somebody has to buffer; the pipe buffers
provide some leeway, but they are limited.

Thanks to Peff for pointing this out:

    http://article.gmane.org/gmane.comp.version-control.git/220534

Signed-off-by: Adam Spiers <git@adamspiers.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-04-11 11:11:36 -07:00
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