println("System path"); // prints
Why not just let Ms run goroutines directly? The problem is system calls. When an M enters the kernel, the entire OS thread blocks — and if all the scheduling resources were attached to the M, they’d be stuck too. The run queue, the memory cache, everything would be frozen until the syscall returns. By putting all of that on a separate P, the runtime can detach the P from a blocked M and hand it to a free one. The work keeps moving even when a thread is stuck.
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Путин освободил от должности помощника секретаря Совета безопасности14:49，这一点在手游中也有详细论述
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