[Async-sig] "read-write" synchronization

[Nathaniel Smith]

On Sun, Jun 25, 2017 at 2:13 PM, Chris Jerdonek
<chris.jerdonek at gmail.com> wrote:
> I'm relatively new to async programming in Python and am thinking
> through possibilities for doing "read-write" synchronization.
>
> I'm using asyncio, and the synchronization primitives that asyncio
> exposes are relatively simple [1]. Have options for async read-write
> synchronization already been discussed in any detail?

As a general comment: I used to think rwlocks were a simple extension
to regular locks, but it turns out there's actually this huge increase
in design complexity. Do you want your lock to be read-biased,
write-biased, task-fair, phase-fair? Can you acquire a write lock if
you already hold one (i.e., are write locks reentrant)? What about
acquiring a read lock if you already hold the write lock? Can you
atomically upgrade/downgrade a lock? This makes it much harder to come
up with a one-size-fits-all design suitable for adding to something
like the python stdlib.

-n

-- 
Nathaniel J. Smith -- https://vorpus.org