这些指令大多数是为了检查i的初始化，以及使用锁执行线程安全的初始化。
Most of these instructions are in place to check for the initialization of I, and to perform a thread-safe initialization using a lock.
本文通过实例演示了如何使用锁事件监控器来收集所有种类的并发性问题：死锁、锁超时及锁等待。
It showed, by example, how you can use the lock event monitor to collect information about any kind of concurrency issue: deadlocks, lock-timeouts, and lock-waits.
Node 声称它绝不会死锁，因为它根本不允许使用锁，它不会直接阻塞 I/O 调用。
Node also claims that it will never deadlock, since there are no locks allowed, and it doesn't directly block for I/O calls.
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