To work around this omission, I use the POSIX condition variable emulations synchronization primitives, which are outlined in the series of articles.

为解决此缺憾，我使用POSIX条件变量模拟同步原语，并在一系列文章中对此进行了概述。

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While the target variable is guaranteed to be only assigned once, the delegate may be called by multiple concurrent threads unless a synchronization object is passed in.

这保证了目标变量只会设置一次。不过，如果没有使用同步对象的话，委托可能会被几个并发线程调用多次。

youdao

When more than one thread accesses a mutable variable, all threads must use synchronization, or else some very bad things can happen.

在不只一个线程访问一个互斥的变量时，所有线程都必须使用同步，否则就可能会发生一些非常糟糕的事情。

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