全部成交否则取消指令 fill or kill ; FOK
立即成交否则取消指令 immediate or cancel ; IOC
有效直至取消指令 Good-Fill-Canceled Orders
有效直至被取消指令 Good till Cancel ; GTC
马上成交否则取消指令 immediate or cancel ; IOC
取消宏指令的伪指令 PURGE
当然，它取消的是程序退出指令。
现在，一个钣金工厂要交叉排产大量的小批量订单，处理最后一刻的订单修改指令，甚至是订单取消等事宜。
A shop may have to juggle numerous small orders and revisions and deal with last-minute changes or even cancellations.
接收者可以要求Future阻止线程，直至一个结果就绪，检测查看它是否完成并取消计算指令，或检查是否有其他进程取消了它。
The recipient can ask the Future to block until a result is ready, poll to see whether it's complete, cancel the computation, or check whether another thread has canceled it.
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