锁是

• First , a thread can hold a read - lock , which is non - exclusive and will allow other threads to gain a read - lock for the class . second , a thread can request a write - lock , which is exclusive , and is not granted until currently held read and write locks are released
  第二，线程可以请求一个写入锁，写入锁是独占的，只有在当前被持有的读取锁和写入锁都得到释放后，才能将写入锁授予其他线程。
• Because the methods of controls and forms sometimes call back to a calling procedure , you can end up inadvertently creating a deadlocka situation in which two threads wait for each other to release the lock , causing the application to halt
  由于控件和窗体的方法有时回调到调用过程，因此可能会因无意中创建了死锁而终止运行（死锁是指两个线程都等待对方释放锁定，从而导致应用程序暂停的情况） 。
• Interlocked operations can be used with volatile memory guarantees to write applications which exhibit powerful non - blocking concurrency , however they require sophisticated , low level programming , and for most purposes simple locks are a better choice
  联锁操作可用于可变内存保证，以编写展示功能强大的非阻止并发的应用程序，但是，它们需要复杂的低级别编程，因此大多数情况下简单锁是更好的选择。
• Failure to synchronize access properly in the same or different application domains can lead to problems such as deadlocks in which two threads stop responding while each waits for the other to complete and race conditions when an anomalous result occurs due to an unexpected critical dependence on the timing of two events
  如果在相同或不同的应用程序域中未能正确地使访问同步，则会导致出现一些问题，这些问题包括死锁和争用条件等，其中死锁是指两个线程都停止响应，并且都在等待对方完成；争用条件是指由于意外地出现对两个事件的执行时间的临界依赖性而发生反常的结果。
• Computer based interlocking is a transport equipment which use the computer to control the point , circuit and lighter , is a tools which used in the station transport by the watcher , is also a fail - safe equipment which can turn over to the safe condition when something is wrong
  计算机联锁是一种将车站道岔、轨道电路和信号机，用计算机进行集中有效控制和管理的重要行车设备，是车站值班员赖于组织行车必不可少的工具，同时也是一种在设备发生故障或人为错误操作时能够将故障导向安全的保安设备。
• Because eeprom is a standard component , its only function is saving data and does not include protection , so this simple circuit design protection lock , can be decoded by those with selfish purposes easily . after this protection lock was promoted for about a year , there was another protection lock that was developed by using asic as its major component . the circuit design of this protection lock was completed with the protection by chipset and added eeprom into it , which improved the defect of former eeprom protection locks with low protection
  在保护锁的演进过程中，最早出现的保护锁是以eeprom为主要组件设计而成的，这种简单线路设计的保护锁，很容易被有心人破解，原因是eeprom为标准的零组件，而且eeprom只是用来储存数据，并不具有保护的效能，所以，在这种保护锁上市大约一年后，就有利用asic为组件所制作的保护锁上市，这种保护锁改进了以往采用eeprom保护锁之保护严谨度不够的缺点，这种线路设计的方式是将保护方法以芯片组完成，并将eeprom加入保护锁中，以达到软件保护的目的。
• Control from a distance a lock of car is the electronics technique and machines technical and perfect combine , have the shape beauty , structure science , control the convenience and guard against theft to defend to consume , the function strong and safe dependable etc . advantage , can the valid management parking lot car , prevent from the appropriation car to be taken up , robbed by the others to have , is upscale villa , small area residence , company 厦 , cabaret , transact the building and airports of good assistant of the parking lot car a management of etc . , and reserve the network to connect , pass the network cloth line , the intelligence network that carries out the parking lot turns the supervision management
  遥控车位锁是电子技术与机械技术的完美结合，具有外形美观、结构科学、控制方便、防盗防耗、功能强大、安全可靠等优点，能有效的管理停车场车位，防止专用车位被他人占用、抢占，是高档别墅、小区住宅、商厦、酒店、办公楼及机场等停车场车位管理的好帮手，并预留网络接口，通过网络布线，实现停车位的智能网络化监控管理。