How to use the pdf2image.generators.ThreadSafeGenerator function in pdf2image

use_pdfcairo = (
        use_pdftocairo
        or use_pdfcairo_format
        or (transparent and parsed_fmt in TRANSPARENT_FILE_TYPES)
    )

    poppler_version = _get_poppler_version(
        "pdftocairo" if use_pdfcairo else "pdftoppm", poppler_path=poppler_path
    )

    if poppler_version <= 57:
        jpegopt = None

    # If output_file isn't a generator, it will be turned into one
    if not isinstance(output_file, types.GeneratorType) and not isinstance(
        output_file, ThreadSafeGenerator
    ):
        if single_file:
            output_file = iter([output_file])
        else:
            output_file = counter_generator(output_file)

    if thread_count < 1:
        thread_count = 1

    if first_page is None:
        first_page = 1

    if last_page is None or last_page > page_count:
        last_page = page_count

    if first_page > last_page:

def g(*a, **kw):
        return ThreadSafeGenerator(f(*a, **kw))