print(cfg.host); // localhost
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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.，详情可参考手游
Number (1): Everything in this space must add up to 1. The answer is 1-3, placed vertically.。博客对此有专业解读