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.
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，更多细节参见PG官网
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国内类似的案例也不在少数，譬如，有公司的微信聊天记录直接被扒走。还有的有用户安装非官方技能包后，电脑莫名卡顿、文件被篡改，有用户遭遇AI擅自删除邮件、乱发消息、泄露API密钥，甚至一觉醒来收到上万元的模型调用账单。