这个计算阶段缺省地支持"信号锁（signal lock）"概念。其意义是指接收器认定先到达的包是应该接收的包，而在这个包的接收期间，置信道的信号锁为1，表明信道已经正在被占用...
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由于这些电子元器件-例如接受无线信号的汽车遥控锁的存在，黑客们才可利用这些弱点有机可乘。
The hack works because some electronic components - such as remote car locks - accepts wireless signals that are vulnerable to interference.
线程模块提供了许多同步原语，包括信号量、条件变量、事件和锁。
The threading module does provide many synchronization primatives, including semaphores, condition variables, events, and locks.
例如，如果不释放锁(相当于一直持有信号量)，就会导致阻塞问题。
For example, if you are not releasing the lock (equivalent to holding a semaphore), you will create your own blockage problem.
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