When invoked if this thread already owns the lock, increment the recursion level by one, and return immediately. if thread doesn't own the lock it waits until owner release lock.

当调用如果线程已持有锁，增量递归层次一，并返回。如果线程没有等待直到主人锁释放锁。

youdao

A single arrow indicates a thread contention: One thread is waiting for another thread to release a lock.

一支单独的箭头指出一个线程竞争：一个线程正在等候另一个线程释放一个锁。

youdao

For example, assume one virtual processor is holding a lock and does not have enough cycles to release that lock.

例如，假定一个虚拟处理器持有一个锁，并且它没有足够的周期来释放这个锁。

youdao

The prototypes we got to try out carried the Level 10 range's chunky, aerated style -- with gaps in the bodywork and beefy catches to lock and release the arms.

ENGADGET: Thermaltake and BMW's Level 10 M gaming headset hands-on

And in May, Australian lock Justin Harrison requested an early release from his contract following an alleged incident during the club's end-of-season party.

BBC: Bath sign Australian back Carraro

The first is quite a doozy -- fairly often, pressing the shutter release in record mode will simply cause the camera to lock up.

ENGADGET: Pentax Q interchangeable lens camera review Hands-on