Re: [PATCH 1/2] Support for setitimer() on platforms lacking it

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"Joachim Schmitz" <jojo@xxxxxxxxxxxxxxxxxx> writes:

>> From: Junio C Hamano [mailto:gitster@xxxxxxxxx]
>> Sent: Tuesday, September 04, 2012 8:47 PM
>> To: Joachim Schmitz
>> Cc: git@xxxxxxxxxxxxxxx; 'Johannes Sixt'
>> Subject: Re: [PATCH 1/2] Support for setitimer() on platforms lacking it
>> 
>> Junio C Hamano <gitster@xxxxxxxxx> writes:
>> 
>> > "Joachim Schmitz" <jojo@xxxxxxxxxxxxxxxxxx> writes:
>> >
>> >>> Only with the observation of "clone", I cannot tell if your timer is
>> >>> working.  You can try repacking the test repository you created by
>> >>> your earlier "git clone" with "git repack -a -d -f" and see what
>> >>> happens.
>> >>
>> >> It does update the counter too.
>> >
>> > Yeah, that was not a very good way to diagnose it.
>> >
>> > You see the progress from pack-objects (which is the underlying
>> > machinery "git repack" uses) only because it knows how many objects
>> > it is going to pack, and it updates the progress meter for every
>> > per-cent progress it makes, without any help from the timer
>> > interrupt.
>> 
>> I think the "Counting objects: $number" phase is purely driven by
>> the timer, as there is no way to say "we are done X per-cent so
>> far".
>> 
>> Doesn't your repack show "Counting objects: " with a number once,
>> pause forever and then show "Counting objects: $number, done."?
>
> Yes, only once, when it is done
> $ ./git repack -a -d -f
> warning: no threads support, ignoring --threads
> Counting objects: 140302, done.
> Compressing objects:   1% (1385/138407)

So this strongly suggests that (1) your "poor-man's" is not a real
substitute for recurring itimer, and (2) users could live with the
progress.c code without any itimer firing.

Perhaps a no-op macro would work equally well?
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