Re: Tiny patch: sigmask.diff - Mailing list pgsql-hackers

From Aleksander Alekseev
Subject Re: Tiny patch: sigmask.diff
Date
Msg-id 20160404181946.4fc88bfe@fujitsu
Whole thread Raw
In response to Re: Tiny patch: sigmask.diff  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-hackers
> Surely this fix is completely wrong?  You'd have to touch every use of
> signum() to do it like that.  You'd also be introducing similarly-
> undefined behavior at the other end of the loop, where this coding
> would be asking to compute 1<<31, hence shifting into the sign bit,
> which is undefined unless you make the computation explicitly
> unsigned.

Oh, I didn't think about that...

> I think better is just to change the for-loop to iterate from 1 not 0.
> Signal 0 is invalid anyway, and is rejected in pg_queue_signal for
> example, so there can't be any event waiting there.

Agreed.

--
Best regards,
Aleksander Alekseev
http://eax.me/

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