dump current stack traces when exiting with SIGINT

                        yield cred

def dumpstacks():

    import threading

    import traceback

    id2name = {th.ident: th.name for th in threading.enumerate()}

    code = []

    for threadId, stack in sys._current_frames().items():

        code.append(f"\n# Thread: {id2name.get(threadId, '')}({threadId})")

        for filename, lineno, name, line in traceback.extract_stack(stack):

            code.append(f"""File: "{filename}", line {lineno}, in {name}""")

            if line:

                code.append("  " + line.strip())

    print("\n".join(code))

def configure_sigint_handler():

    # make the program just exit at ctrl+c without waiting for anything

    def sigint_handler(sig, frame):

        print(f'Interrupted with signal {sig} in {frame}')

        dumpstacks()

        os._exit(0)

    if not os.environ.get("COVERAGE_RUN"):