要用线程安全地编写程序是很难的；需要操纵线程的程序很容易引起不一致的数据、死锁、不可伸缩的锁定以及倒置的优先级等问题。
It's hard to program safely; programs that manipulate threads are prone to inconsistent data, deadlocks, unscalable locking, and inverted priorities.
你在完成工作的过程中，不可本末倒置。
Don't put the cart before the horse in the process of getting the job done.
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