也可以用非阻塞方式调用send方法。

Send can also be called in a non-blocking way.

youdao

lock函数必须立即进行检查并返回(非阻塞方式)。

The lock function must immediately check and return (non-blocking).

youdao

lock函数必须立即进行检查并返回(非阻塞方式)。

The lock function must immediately check and return (non-blocking).

youdao