A thread is counted only once, even if the lock allows recursion and the thread has entered read mode multiple times.
即使锁定允许递归并且线程已进入读取模式多次，也只对每个线程计数一次。
A thread is counted only once, even if the lock allows recursion and the thread has entered read mode multiple times.
即使锁定允许递归并且线程已进入读取模式多次，也只对每个线程计数一次。
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