[issue32561] Add API to io objects for non-blocking reads/writes

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> And all the async file IO APIs I know [1][2][3] have the public API of "just like regular files, but the blocking methods are async". 99% of the time, that means TextWrapper and BufferedStream. So I just don't see any way to get the advantages of this feature without either (a) adding buffer-only support to those layers, or (b) forking those layers into a 3rd-party library, and then adding buffer-only support.

Yeah... The concrete problem is that there's already a poorly thought-out "non-blocking mode" that only partly works, and suddenly the code (which includes a lot of delicate, performance-critical C code... to give you an idea, even recently a consistency bug in truncate() was discovered) will have to be massaged to support another non-blocking mode of operation.

So that's why I'm very cautious about integrating this into BufferedReader and friends.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32561>
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