Re: [paho-dev] Contributing and coding standards?

[Daniel Santos <daniel.santos@xxxxxxxxx>]

Sorry for the late response.  I just got over being sick and catching up
today.

Having the ability to run the full Paho C library doesn't making it
automatically make it prudent.  In my case I'm running a MIPS32KEc with
256MiB of ram.  This is a 580 HMz cpu with 64KiB of i-cache and 32KiB of
d-cache and my MQTT stuff is only a very small part of what is running
on the board.  The larger my footprint, the less I'll be able to do
before saturating the CPU, either due to execution of instructions or
cache misses.  Having a certain amount of free RAM is important to the
kernel (Linux in my case) being able to allocate optimally sized buffers.

Daniel


On 11/16/18 9:44 AM, Frank Pagliughi wrote:
> Just out of curiosity, why are you folks looking at the Embedded C
> library if you have a POSIX system rather than the Paho C library?
>
> Frank
>
> On 11/15/18 7:34 PM, Greg Troxel wrote:
>> I definitely am in favor of writing to the POSIX spec instead of linux
>> man pages.  That gets you portability to a huge range of systems,
>> including ones you don't even know exist.
>>
>> Usually, libraries are written to POSIX, perhaps relying on as little as
>> necessary.  But, there are platforms which are much less than POSIX,
>> like the Arduino IDE.  I am not quite clear on if your platform is not
>> posix (an unhosted environment like one might have with the Arduino
>> IDE?) or if you are just wanting things to be leaner.  It seems to me
>> that lean, and a non-POSIX environment are two separate issues, and that
>> lean would benefit almost everyone, especially if the issue is CPU and
>> memory use vs code size.
>>
>> About socket and timer: when designing for arbitrary less-than-POSIX
>> environments where you try to assume C99 (or C++NN) and no further, you
>> run into needing various things that aren't in that spec, and then
>> defining interfaces that the platform has to define to use the library.
>> I think that's what you mean about Socket and Timer.
>> I would suggest, without certainty, that if you need something that
>> exists in POSIX (like sockets), that you consider using that or a
>> defined subset, and then ask the platform to define the calls that POSIX
>> expects.  This reduces brain effort for readers, as they know the
>> interface, and you will probably find that many systems that are C99 but
>> not POSIX do various things that are posixy the posix way.
>>
>> Also, it may be good to have the platform API in C, not C++ - but that
>> may be my old-school bias showing.
>>
>> Hope this helps...
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