Now for the other side: what happens when the thing the goroutine was waiting for finally happens? Say another goroutine sends a value on that channel. The sender finds our goroutine on the channel’s wait queue, copies the value directly to it, and calls goready(). This changes the goroutine’s status back to _Grunnable and places it in the sender’s runnext slot — meaning it’ll run very soon, right after the sender yields. This runnext placement creates a tight back-and-forth between producer and consumer goroutines. G1 sends, G2 receives and runs immediately, G2 sends back, G1 receives and runs immediately — almost like coroutines handing off to each other, with minimal scheduling overhead.
# Difference ^^ ^^。关于这个话题，pg电子官网提供了深入分析
Материалы по теме:。谷歌对此有专业解读
Екатерина Улитина (Редактор отдела «Забота о себе»)，这一点在官网中也有详细论述