Potential Windows-specific lost event race in the implementation of time.sleep

[zackw]

Bug description:

In the Windows-specific implementation of time.sleep there appears this code:

cpython/Modules/timemodule.c

Lines 2341 to 2345 in b706ff0

	// Check for pending SIGINT signal before resetting the event
	if (PyErr_CheckSignals()) {
	goto error;
	}
	ResetEvent(sigint_event);

If a control-C event happens after PyErr_CheckSignals returns, but before ResetEvent is called, I believe that event may be lost.

This is probably a hard race window to hit, and I don't have a Windows development environment, so I have not confirmed that it is possible.

CPython versions tested on:

CPython main branch

Operating systems tested on:

Windows