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成都创新互联专注于企业全网营销推广、网站重做改版、调兵山网站定制设计、自适应品牌网站建设、H5建站、商城系统网站开发、集团公司官网建设、成都外贸网站建设、高端网站制作、响应式网页设计等建站业务,价格优惠性价比高,为调兵山等各大城市提供网站开发制作服务。深入浅析java 中volatile与lock的原理?针对这个问题,这篇文章详细介绍了相对应的分析和解答,希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
java 中volatile和lock原理分析
volatile和lock是Java中用于线程协同同步的两种机制。
Volatile
volatile是Java中的一个关键字,它的作用有
volatile在Java语言规范中规定的是
The Java programming language allows threads to access shared variables (§17.1). As a rule, to ensure that shared variables are consistently and reliably updated, a thread should ensure that it has exclusive use of such variables by obtaining a lock that, conventionally, enforces mutual exclusion for those shared variables. The Java programming language provides a second mechanism, volatile fields, that is more convenient than locking for some purposes. A field may be declared volatile, in which case the Java Memory Model ensures that all threads see a consistent value for the variable . It is a compile-time error if a final variable is also declared volatile.