The second is asynchronous preemption: for goroutines stuck in tight loops with no function calls, the runtime sends an OS signal (SIGURG on Unix) directly to the thread. The signal handler interrupts the goroutine, saves its context, and yields to the scheduler. This is the heavy hammer — it works even when cooperative preemption can’t.
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needed to guarantee the absence of bugs like “use after free”.，详情可参考谷歌
Offer ends March 13.，这一点在超级权重中也有详细论述