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Go 垃圾回收 | nino's blog
source link: https://ninokop.github.io/2017/11/09/Go-%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6/?
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通常C++通过指针引用计数来回收对象，但是这不能处理循环引用。为了避免引用计数的缺陷，后来出现了标记清除，分代等垃圾回收算法。Go的垃圾回收官方形容为 非分代 非紧缩 写屏障 并发标记清理。标记清理算法的字面解释，就是将可达的内存块进行标记mark，最后没有标记的不可达内存块将进行清理sweep。 三色标记法判断一个对象是不是垃圾需不需要标记，就看是否能从当前栈或全局数据区 直接或间接的引用到这个
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