fix race in aiocb objects

v1.2.12

recycle pcb in next waitio

v1.2.11

fix arm flag

v1.2.10: Squashed commit of the following:

commit ce20a809ac162048f429b737cf137816a3fff19d
Author: xtaci <daniel820313@gmail.com>
Date:   Thu May 6 10:08:16 2021 +0800

    remove defer in hot path

initial release

The first release of gaio library.

initial release

v1.0.0

adjusts comments