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

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

The Linux kernel 5.1 also got a new "io_uring" for asynchronous I/O:

"Ringing in a new asynchronous I/O API"
https://lwn.net/Articles/776703/

Linux 5.2: "The io_uring mechanism has a new operation, IORING_OP_SYNC_FILE_RANGE, which performs the equivalent of a sync_file_range() system call. It is also now possible to register an eventfd with an io_uring and get notifications when operations complete."

Linux 5.3: "The io_uring mechanism has gained support for asynchronous sendmsg() and recvmsg() operations."

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<https://bugs.python.org/issue32561>
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