questions on module developer

[Alder Netw]

Anybody here can tell me when these twe function
init_process(), and exit_process() in a module (ngx_module_t)

be called? init_process being called once when nginx starts

or when a query matched with a location defined in nginx.conf

is received? When would the exit_process() gets called? At process
exits or never gets called as long as nginx is alive?

Thanks,
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