Re: Release date for Privoxy 3.0.24

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Ian Silvester <[email protected]> wrote:

> On 2016-01-21 13:48, Fabian Keil wrote:
> > Ian Silvester <[email protected]> wrote:
> >>                                                          These may sti=
ll
> >> not be unique in their first 4 bytes (though they're significantly more
> >> different than the raw ids); I'll admit I don't understand the comment=
's
> >> talk of a "debuggable value in the first 4 bytes" - do you think it
> >> simply means a unique value in those 4 bytes? And what is so important
> >> about the first 4 bytes of the value from a debugging perspective? =20
> > While I'm having trouble parsing the comment as well, I interpret it si=
milarly.
> > I assume David meant to write "discernible" or "distinguishable" or som=
ething
> > like this and was using a 32 bit system which is relevant for the "4 by=
tes" part.
[...]=20
>     I wrote that comment.   'debuggable' literally meant just that.  If
>     you wanted to attach gdb, for example, you'd want to know which proce=
ss
>     ID to attach to... but of course we're talking about threads, not
>     processes.  So debuggability is actually moot here.
>=20
>     The idea was simply to make the thread ID look somewhat presentable a=
s a
>     number, and still have a reasonable chance of not colliding with anot=
her
>     similarly truncated thread ID (in Privoxy).  The Mach kernel has a ve=
ry
>     chatty thread ID, so I was just trying to reduce clutter in the log.
>=20
>     - David
>=20
>=20
>=20
> Thanks for the input David!
>=20
> So the upshot is that we don't need to worry about debuggability (I'll=20
> modify the comment appropriately) and only need to ensure no numbering=20
> collision whilst indeed making the log more readable.
>=20
> Fabian, given the style of the raw ids (e.g. 7fff78fb5000) the '% 1000'=20
> has the effect of simply stripping the least significant three digits,=20
> which are always 000. This alone then does not affect the uniqueness of=20
> the IDs. e.g. 7fff78fb5000 becomes 7fff78fb5, right?

Nope:

fk@r500 ~ $perl -e 'printf("%x\n", 0x7fff78fb5000 % 1000);'
3c8

To strip the least significant three hexadecimal digits, which indeed
would not change the uniqueness if they are always zero, you would have
to divide by 16 to the power of three:

fk@r500 ~ $perl -e 'printf("%x\n", 0x7fff78fb5000 / 16**3);'
7fff78fb5

> Since they remain unique at that stage, taking their absolute value as=20
> long ints will still give a unique value - I think we are safe here with=
=20
> the abs->labs change. All that needs to change is the comment ;o)
>=20
> Unfortunately pthread_getthreadid_np() is not available on OS X. Here we=
=20
> have pthread_threadid_np() instead which I cannot recommend, both=20
> because the syntax is significantly different and because it is only=20
> available since 10.6, which'd cut off OS X versions we currently support.

That's good to know.

Fabian

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