It should not work - see a doc
If the file includes a function named
If the file includes a function named
_PG_fini, that function will be called
immediately before unloading the file. Likewise, the function
receives no parameters and should return void. Note that
_PG_fini will only be called
during an unload of the file, not during process termination.
(Presently, unloads are disabled and will never occur, but this
may change in the future.)