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Introduction to Golang Preemption Mechanisms

A short explanation of what is preemption and how it works

So a goroutine could suck up all the cpu-time, starve the others, and delay new ones, until it explicitly gave up control, such as by calling runtime.Gosched() or during I/O operations. It occurs at so-called “safe-points”, which are places in the code where we know for sure that we can take over control flow from a goroutine without getting into trouble. As said in the comments, asyncPreempt spills all registers to save the context, and gets into asyncPreempt2, which in turn goes into gopreempt_m, that will act as if the goroutine just called runtime.Gosched().

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