说明：  线程之间的互斥锁，当线程之间所用的资源相同，要同时访问，为了防止冲突，要用互斥锁。
(请键入文字或网站地址，或者上传文档。 取消 Xiànchéng zhī jiān de hù chì suǒ, dāng xiànchéng zhī jiān suǒyòng de zīyuán xiāngtóng, yào tóngshí fǎngwèn, wèile fángzhǐ chōngtú, yào yòng hù chì suǒ.Mutex between threads, when the same resources between threads used to simultaneously access, in order to prevent conflict, to use mutex.)