锁定线程
看了几天的线程同步,还是一头雾水,现在只能按照自己的理解写出来,希望大家批评指正! 看下面情况,张三在银行存了1000块钱。某天,张三和他老婆同时想取钱(不知道对方也想取),然后他们来到两个不同的ATM机前(他的卡有一张附属卡),然后两人同时输入取款1000的命令,银行系统先查询账户余额,账户里面有1000块,系统判断金额正确,就执行了......可想而知,银行肯定不会这么干的。为了避免这种情况的发生,银行在取款事件上加了锁,一次只能进入一个,两条命令同时进入的时候,根据一定的规则,进行排队执行。
如果使用多线程操作,我们可以用监视器Monitor或者锁lock进行处理。Monitor提供了Enter,Exit,
TryEnter等方法供我们使用。
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通过这个示例可以看到,第二次执行的时候中间等待了2秒,就是不能同时执行了。lock用法和这个差不多。
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