[FPM] when to call extensions MINIT and MSHUTDOWN

Hi guys,

I'm sure when FPM should call extensions MINIT and MSHUTDOWN functions.

MINIT is called once by the master process after it forks any
children. It's done by calling php_module_startup() in
cgi_sapi_module.startup().
MSHUTDOWN is also called by the master process before exiting and
after it kills all its children. It's done by calling
php_module_shutdown_wrapper();

Is it normal behaviour ? Or should MINIT and MSHUTDOWN be also called
in each child process somehow ?

Thanks
++ Jerome