抢占 | Go 语言笔记

# 抢占 | Go 语言笔记

抢占 # 从 Go 1.14 开始，通过使用信号，Go 语言实现了调度和 GC 过程中的真“抢占“。
抢占流程由抢占的发起方向被抢占线程发送 SIGURG 信号。
当被抢占线程收到信号后，进入 SIGURG 的处理流程，将 asyncPreempt 的调用强制插入到用户当前执行的代码位置。
本节会对该过程进行详尽分析。
抢占发起的时机 # 抢占会在下列时机发生：
STW 期间 在 P 上执行 safe point 函数期间 sysmon 后台监控期间 gc pacer 分配新的 dedicated worker 期间 panic 崩溃期间 freezetheworld - preemptall; "debug.WriteHeapDump" - stopTheWorld; "runtime.Stack" -

[https://go.xargin.com/docs/runtime/scheduler/preemption/](https://go.xargin.com/docs/runtime/scheduler/preemption/)

No repository file or test is named. Start by reading the linked Go preemption article and inspect how this repository stores blog comments; clarify whether the intended work is a correction, expansion, or new documentation. Done means an agreed, reviewable documentation change with a defined location and scope.

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