Start a child thread that evaluates the lock request.
启动一个对锁请求进行处理的子线程。
Agent 2: NS lock GRANTED on child table row ID (0.4) (from select).
代理2：ns锁对子表行ID(0.4)为GRANTED(由于select)。
The lock function main thread gets the result from the child thread.
lock函数主线程从子线程获得结果。
The lock function main thread gets the result from the child thread.
lock函数主线程从子线程获得结果。
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