groutine睡眠以及唤醒中(runtime_SemacquireMutex) skipframes 参数不理解

Question

// SemacquireMutex is like Semacquire, but for profiling contended Mutexes.
// If lifo is true, queue waiter at the head of wait queue.
// skipframes is the number of frames to omit during tracing, counting from
// runtime_SemacquireMutex's caller.
func runtime_SemacquireMutex(s *uint32, lifo bool, skipframes int) 

这个 skipframes 代表的是什么意思？ go1.14 在 RWMutex 的逻辑中只有 Runlock 时为 1，其他时候都是 0 是什么原理？

Answer 1

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