深入浅析java中volatile与lock的原理-创新互联
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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
- 保证变量的可见性
- 防止重排序
- 保证64位变量(long,double)的原子性读写
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.
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