Re: [Maria-discuss] writing plugin with .net language (C#)

Hello, On Sun, Oct 4, 2015 at 9:05 AM, Guillaume Lefranc < guillaume.lefranc@mariadb.com> wrote:

Hi Roberto,

you could have a try at it with Golang, it can wrap C code easily https://golang.org/cmd/cgo/

Though with Go1.5 its now possible, uninstalling the plugins still leads to segfaults. And sadly, looks like it can't be fixed (not in near future, at least). https://github.com/golang/go/issues/12582 Best, Nirbhay Best regards,

Guillaume Lefranc RemoteDBA Services Manager - MariaDB Corporation Ab

On Sun, Oct 4, 2015 at 3:26 AM, Roberto Spadim wrote:

...

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 :

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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 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 :

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: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 :

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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 wrote:

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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

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