锁保护的临界区：经lock - UNLOCK对不能实现完全的内存屏障的功能，但是，它们也的确会影响内存访问顺序，参考下面的示例代码。

LOCK-Based Critical Sections: Although a LOCK-UNLOCK pair does not act as a full memory barrier, these operations do affect memory ordering. Consider the following code.

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Vega处理器包含了一个客户化的读屏障指令，它具有字段检查元数据和针对GC压缩页面的特殊的虚拟内存保护。

Vega processors included a custom read barrier instruction that included bit field checking in reference metadata as well as special virtual memory protection for GC-compacted pages.

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