Replace mutex with spin-lock

Update READMEs

worker: decRunning when revertWorker is false

Signed-off-by: Cholerae Hu <[email protected]>

Remove some useless code

A little bit of optimization in periodicallyPurge()

Fixed panjf2000#45 and Releasing v2 module

Fixed panjf2000#45 and Releasing v2 module

support nonblocking submit and max blocking limit setting

Signed-off-by: Cholerae Hu <[email protected]>

🎏Fix a bug where invokers get stuck in waiting idle workers

🧸Remove useless test cases