signal.py

from typing import Awaitable, Generic, TypeVar

from cocotb.triggers import Event

T = TypeVar("T")


class Signal(Generic[T]):

    def __init__(self, __init_value: T) -> None:
        self._value = __init_value
        self._last_value = __init_value
        self._event = Event()

    @property
    def value(self) -> T:
        return self._value

    @value.setter
    def value(self, __value) -> None:
        self._value = __value
        self._event.set()

    @property
    def last_value(self) -> T:
        return self._last_value

    @property
    def event(self) -> Awaitable[None]:
        self._event.clear()
        return self._event.wait()