Function _configure_registries

lib/sqlalchemy/orm/mapper.py:4200–4231

(
    registries: Set[_RegistryType], cascade: bool
)

def _configure_registries(
    registries: Set[_RegistryType], cascade: bool
) -> None:
    for reg in registries:
        if reg._new_mappers:
            break
    else:
        return

    with _CONFIGURE_MUTEX:
        global _already_compiling
        if _already_compiling:
            return
        _already_compiling = True
        try:
            # double-check inside mutex
            for reg in registries:
                if reg._new_mappers:
                    break
            else:
                return

            Mapper.dispatch._for_class(Mapper).before_configured()  # type: ignore # noqa: E501
            # initialize properties on all mappers
            # note that _mapper_registry is unordered, which
            # may randomly conceal/reveal issues related to
            # the order of mapper compilation

            _do_configure_registries(registries, cascade)
        finally:
            _already_compiling = False
    Mapper.dispatch._for_class(Mapper).after_configured()  # type: ignore


@util.preload_module("sqlalchemy.orm.decl_api")