valgrind stuff

Brandon Black blblack at
Thu Apr 10 00:34:22 CEST 2008

Marc Lehmann wrote:
> On Wed, Apr 09, 2008 at 04:40:23PM -0500, Brandon Black <blblack at> wrote:
>> Here's an interesting thread from another list regarding this exact same 
>> problem:
>> I'm still a little hazy on what the "right" answer is here, as I'm not a 
>>  poll() expert, but something like this may be the answer:
> poll() is required to clear the revents field.
> however, if any real-world systems don't do that on timeout, I'd be happy to
> include a workaround, the cost would be negligible.
> (in fact, I might add it in any case, but please, could somebody find out a
> bit more evidence? thanks :)

My reading of that other thread I quoted is basically (a) the standard 
is self-contradictory, (b) some systems definitely don't clear revents 
when they poll() returns zero (what I'm seeing), and (c) there's really 
no point looking at revents when poll returns zero, as this means there 
are zero events to look at anyways.

-- Brandon

More information about the libev mailing list