Interlacing ContextManager

[zhangyx (Yuxuan Zhang)]

Thank you @ncoghlan for the information! I did not know that this problem has been brought into your attention so long ago…

Is there any ongoing attempt/proposal to have “atomic” code blocks which can be free of async exceptions just like C-bindings?

Something like this:

@gcewing

try:
    ...
atomic finally:
    # KeyboardInterrupt here will be deferred
    # until execution exits the block
    disable_async_exceptions()
    clean_things_up()
    enable_async_exceptions()

And this:

class Wrapper:

    atomic def __exit__(self, *_):
        # KeyboardInterrupt here will be deferred
        # until execution exits the function
        self.cleanup()

Since deferring async exceptions is a breaking change that changes when interrupts are raised, I guess this has to be explicitly requested (hence a new keyword).