Re: [mosquitto-dev] External loop with poll()

[Roger Light <roger@xxxxxxxxxx>]

mosquitto_want_write returns true if there is data ready to be written
on the socket. This corresponds to the POLLOUT event. You should
always set POLLIN.

pfd.events = POLLIN;
if(mosquitto_want_write(mosq)){
    pfd.events |= POLLOUT;
}


Cheers,

Roger



On Wed, Sep 14, 2016 at 9:26 PM, Zoltan Gyarmati
<mr.zoltan.gyarmati@xxxxxxxxx> wrote:
> Dear Roger & All,
>
> thanks for the prompt answer! And if i call mosquitto_want_write() when
> returning, which event flag(s) i have to set?
> My current version looks like:
> https://gist.github.com/zgyarmati/fa2e2be391c664f35bd2ccac5c4cad3a
> but i have the same symptoms: when only POLLIN enabled, the client
> dis/reconnects to the broker, if POLLOUT also enabled, i get busy loop...
> Any further ideas
>
>
> Thanks in advance, regards
>
> Zoltan Gyarmati
> https://zgyarmati.de
>
> On 2016-09-14 18:41, Roger Light wrote:
>
> Hi Zoltan,
>
> You should use mosquitto_want_write() (or a similar name, I'm on my phone
> and going on memory) to find out when the client wants to write.
>
> Cheers,
>
> Roger
>
>
> On 14 Sep 2016 4:58 p.m., "Zoltan Gyarmati" <mr.zoltan.gyarmati@xxxxxxxxx>
> wrote:
>>
>> Dear All,
>>
>> I'm trying to integrate a libmosquitto client into my application built
>> around poll() and mosquitto_loop_write() and co.
>> Here is the relevant excerpt of the code:
>> https://gist.github.com/zgyarmati/fa2e2be391c664f35bd2ccac5c4cad3a
>>
>> I got confused about the needed events flags: if i set only POLLIN at line
>> #89 (and #114) at the first PINGREQ the client dis- and reconnects (I assume
>> it can't send out the request, so it won't get answer to it neither), but if
>> i set "POLLIN | POLLOUT", the poll always returns instantly
>>  (regardless if actual event was happening) with the mosquitto socket's
>> fd, pushing the CPU to 100%.
>> What do i miss here?
>>
>> Thanks in advance, regards
>>
>> --
>> Zoltan Gyarmati
>> https://zgyarmati.de
>>
>>
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>
>
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