This can be prevented by imposing a strict control on the visibility of the Barrier object to only the set of processes that have synchronized on it.
要想防止这个问题，可以对Barrier对象的可见性进行严格控制，只允许那些已经在Barrier上同步的进程集看到它。
The main purpose of this paper is to make three brushless DC motors as control object and based on relative coupling strategy to study synchronized control of multi-motor system.
以三台无刷直流电动机为控制对象，分析基于偏差耦合的多电机同步控制策略。
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