On: Sub-millisecond GC pauses in Go 1.8

[rayiner]

I assume this works so quickly in part because goroutines are backed by a pool of OS threads that don't block? So everybody doesn't get stuck waiting for a thread that's blocked to get around to checking the preemption flag?

[pcwalton → rayiner]

Right, blocked threads are stopped in the userspace scheduler so there are no synchronization issues with just keeping them stopped.