maria-discuss team mailing list archive

[Roberto Spadim <roberto@xxxxxxxxxxxxx>]

hummm, it's like creating a ".dll" that export functions to other program
call it? in this case your fast bit UDF functions export init/denit
functions to mysql, right? and you are using C++ or C language when you use
"extern"? i don't  know how compiler know if it's a C or C++ code

2015-10-03 20:36 GMT-03:00 Justin Swanhart <greenlion@xxxxxxxxx>:

> extern "C" {
>
> Makes the function use CDECL calling conventions, which is equivalent to
> setting the .NET code to use CDECL calling conventions.  Any language that
> supports exporting symbols with CDECL calling conventions supports
> interoperating with C (it stands for C declarations aka C calling
> conventions).
>
> --Justin
>
> Sent from my iPhone
>
> On Oct 3, 2015, at 1:57 PM, Roberto Spadim <roberto@xxxxxxxxxxxxx> wrote:
>
> sorry guys, i'm a bit confuse about c++ and c
>
> i'm reading your fastbit udf code
>
> at /fb_udf.h
> you have a C code, right?
> and at fb_udf.cpp a c++ code
>
> you can mix c and c++ at the same code?
>
>
> at udf.h
> what this do?
>
> "
> extern "C" { "
> those functions should be undestood as "C" instead of "C++", or compiler
> should "export" those c++ function to "C" "code", or something related to C
> and namespaces ?
>
> sorry it's not mysql specific but i'm not finding some C++ plugins examples
>
>
> 2015-09-21 13:43 GMT-03:00 Roberto Spadim <roberto@xxxxxxxxxxxxx>:
>
>> :D nice
>> what i will is something like:
>>
>> 1) a plugin daemon that receive a tcp/ip connection with a double linked
>> list "feed" (something like:  clear list, delete from position x to y,
>> delete position x, insert at position x, update position x, move position x
>> to y)
>> 2) save this feed to a myisam/spider/innodb/anyother engine (i'm thinking
>> about using a mysql handler api) (i didn't check how it works, but i think
>> handler sock use it)
>> 3) keep the double linked list at memory (reconstruct the list when
>> server shutdown, maybe make some snapshots to avoid a long reconstruct,
>> something like after X lines of feed, save the list, or after x minutes)
>> 4) a engine to read the double linked list at memory (i don't know yet
>> how do this, but i will need some control about reading a shared memory,
>> how to access this shared memory from daemon plugin using storage engine)
>> 5) a engine to read information about what daemon is doing (like 4)
>> 6) at same plugin daemon, create a tcp/ip connection to "export" the same
>> feed to others users (just a proxy, not a big problem)
>>
>> at top level i think i will have 1 daemon plugin + 1 storage engine plugin
>>
>> i'm thinking about c++ 11 cause it have double linked lists, threads,
>> atomic, sockets, and i dont need others libs (maybe i'm wrong, but that was
>> my first impression about c++11)
>>
>> 2015-09-21 13:34 GMT-03:00 Justin Swanhart <greenlion@xxxxxxxxx>:
>>
>>> Hi,
>>>
>>> My fastbit UDF use C++ 11 no problem.
>>>
>>> https://github.com/greenlion/FastBit_UDF
>>>
>>> On Fri, Sep 18, 2015 at 11:52 PM, Sergei Golubchik <serg@xxxxxxxxxxx>
>>> wrote:
>>>
>>>> Hi, Roberto!
>>>>
>>>> On Sep 18, Roberto Spadim wrote:
>>>> > guys , i'm still with doubts... but not more about c#, now about c++
>>>> > i was thinking about rewrite the code with c++
>>>> >
>>>> > my doubt is.... could i use C++ 11 ? or i will have problem with
>>>> mariadb
>>>> > makefiles etc etc?
>>>>
>>>> Sure, you  can use any language you want, C++11 is perfectly fine too.
>>>> cmake doesn't care.
>>>>
>>>> Regards,
>>>> Sergei
>>>>
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>>>
>>>
>>
>>
>> --
>> Roberto Spadim
>> SPAEmpresarial - Software ERP
>> Eng. Automação e Controle
>>
>
>
>
> --
> Roberto Spadim
> SPAEmpresarial - Software ERP
> Eng. Automação e Controle
>
>


-- 
Roberto Spadim
SPAEmpresarial - Software ERP
Eng. Automação e Controle