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Re: [mosquitto-dev] External loop with poll()
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Dear Roger & All,
ok, with some experimenting i got this right, for anyone from the future
i've upgraded the gist to a properly working version at:
https://gist.github.com/zgyarmati/fa2e2be391c664f35bd2ccac5c4cad3a
and also there is a small blog article about it:
https://zgyarmati.de/blog/libmosquitto-client-with-external-poll/
Thanks again, regards
Zoltan Gyarmati
https://zgyarmati.de
On 09/16/2016 01:00 PM, Roger Light wrote:
> 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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