A condition variable allows a task to wait on a synchronization primitive within a critical region.
一个条件变量允许任务等待一个同步原语，以进入临界区。
Semaphores are another type of synchronization primitive that come in two flavors: binary and counting.
信号量是又一种以两种风格出现的基本方法：二进制和计数模式。
A benchmark to measure the performance of a synchronization primitive should take into account a realistic degree of contention.
用来度量同步性能的基准应该考虑实际的竞争程度。
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