Boszormenyi Zoltan <zb@cybertec.at> writes:
> 2013-03-17 16:07 keltez�ssel, Tom Lane �rta:
>> It suddenly occurs to me though that there's more than one way to skin
>> this cat. We could easily add another static flag variable called
>> "sigalrm_allowed" or some such, and have the signal handler test that
>> and immediately return without doing anything if it's off. Clearing
>> and setting such a variable would be a lot cheaper than an extra
>> setitimer call, as well as more robust since it would protect us from
>> all sources of SIGALRM not just ITIMER_REAL.
> Something like the attached patch?
Well, something like that, but it still needed some improvements. In
particular I thought it best to leave the signal handler still releasing
the procLatch unconditionally --- that behavior is independent of what
this module is doing. Also you seem to have some odd ideas about what
do-while will accomplish. AFAIK, in this usage it's purely a syntactic
trick without much semantic content. It's the marking of the variable
as "volatile" that counts for telling the compiler not to re-order
operations.
Updated and committed.
regards, tom lane
