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.
在实践中，为了达到最大吞吐量，往往需要大量锁。
In practice, a large number of locks is often desirable for maximum throughput.
同乐观锁定策略相比，物理数据库锁需要持续较长的时间，因此应用程序性能和吞吐量很可能会受到影响。
As physical database locks are held for a longer time duration than with an optimistic locking strategy, there is more of a chance for performance and throughput being impacted.
在内核中可以使用互斥锁来实现信号量行为。
Mutexes are available in the kernel as a way to accomplish semaphore behavior.
应当尽量避免使用悲观锁，因为它会影响吞吐量，而且很难从坏锁(badlocks)中恢复。
Avoid pessimistic Locking since the pessimistic locks affect the throughput and it's difficult to recover from bad locks.
它不适合进行高吞吐量的缓存，也不支持基于LRU (Latest Recently Used)的缓存校验与分布式的锁语义。
It is not suited for high throughput caching and does not provide any LRU based cache invalidation or distributed locking semantics.
也有部分保险柜使用电子密码锁，电子密码锁具有密码量极大，使用方便等优点。
Some safes use electronic code locks, whose advantage is that the amount of its passwords is enormous.
这可能导致暴涨的锁争之间的交易，从而严重限制的事务吞吐量。
This can result in skyrocketing lock contention between transactions, which can severely limit transactional throughput.
希望看到这里，你应该对二进制信号量，计数信号量和互斥锁的区别有了清晰的认识。
Hopefully you should now be clear about the core differences between the Binary Semaphore, General (counting) Semaphore and the Mutex.
量油孔分带锁式和脚踏式，安装于油罐顶部，用于测量管内油品的标高和温度及取样等。
The oil hole zoning and pedal locks, set on the tank tops, used for measuring the elevation and oil tube temperature and sampling, etc.
量油孔分带锁式和脚踏式，安装于油罐顶部，用于测量管内油品的标高和温度及取样等。
The oil hole zoning and pedal locks, set on the tank tops, used for measuring the elevation and oil tube temperature and sampling, etc.
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