Authored Comments

in the locking section you make the statement: "So long as no thread holds a lock while it sleeps, does I/O, or some other GIL-dropping operation, you should use the coarsest, simplest locks possible. Other threads couldn't have run in parallel anyway."

What prevents the preemptive dropping of the GIL from happening while you have a lock?

Thanks for your quick response!

If I'm understanding you correctly, the intent of the statement I referenced was to avoid using locks around external operations, where you could then block multiple threads, if they all depended on that lock.

For the preemptive example, Thread A isn't blocked by anything externally, so the processing just goes back and forth similar to cooperative multitasking.

Do I have that right?