Hi!
On Jun 29, Muslimas Chochlovas wrote:
> Hello,
>
> Usually when we want to declare one or more plugins we use two macros
> defined in plugin.h: mysql_declare_plugin and mysql_declare_plugin_end
> (http://dev.mysql.com/doc/refman/6.0/en/plugin-creating.html). It works just
> fine if the implementation is within a single file. If you try to declare
> plugins in separate files using the macros above, the compiler will complain
> about multiple definitions of _mysql_plugin_interface_version_ and
> _mysql_plugin_declarations_. Now what I did - suppose we have two files
> plugin_1.cc and plugin_2.cc. plugin_1.cc contains only functions and data
> structures needed by plugin_1 and the same for plugin_2.cc
> Simplified plugin_1.cc:
> //plugin_1.cc
> .....
> struct st_mysql_plugin plugin_1= {....};
> .....
> //plugin_2.cc
> .....
> struct st_mysql_plugin plugin_2= {....};
> .....
>
> Then I add one file to declare plugins manually without using macros.
> //init.cc
> extern st_mysql_plugin plugin_1;
> extern st_mysql_plugin plugin_2;
>
> struct st_mysql_plugin dummy=
> {0,0,0,0,0,0,0,0,0,0,0,0};
>
> int _mysql_plugin_interface_version_= MYSQL_PLUGIN_INTERFACE_VERSION;
> struct st_mysql_plugin _mysql_plugin_declarations_=
> {
> plugin_1,
> plugin_2,
> dummy
> };
>
> It compiles and runs without errors. But my question - is it correct to
> declare plugins this way or maybe there should be another approach. I just
> couldn't find any documentation or examples which would match my case.
It should be ok. Although you could just as well use macros and write
mysql_declare_plugin(yours)
plugin_1,
plugin_2
mysql_declare_plugin_end
Or even
mysql_declare_plugin(yours)
{ .... }, // declarations for plugin 1
{ .... }, // declarations for plugin 2
mysql_declare_plugin_end
because there's no rule that plugin declaration cannot refer to a
function in a different file. That is, you put your functions in
whatever file you want, and a plugin declaration in a different file -
no problem whatsoever.
Regards / Mit vielen Grüssen,
Sergei
--
__ ___ ___ ____ __
/ |/ /_ __/ __/ __ \/ / Sergei Golubchik <serg@stripped>
/ /|_/ / // /\ \/ /_/ / /__ Principal Software Engineer/Server Architect
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