@yph007595 go 语言没有提供 volatile ，方案就是用 atomic ，上面说的 The Go Memory Model 里有说明：
Atomic Values
The APIs in the sync/atomic package are collectively “atomic operations” that can be used to synchronize the execution of different goroutines. If the effect of an atomic operation A is observed by atomic operation B, then A is synchronized before B. All the atomic operations executed in a program behave as though executed in some sequentially consistent order.

The preceding definition has the same semantics as C++’s sequentially consistent atomics and Java’s volatile variables.