62e53b7922
This adds support for pausing a running G by sending a signal to its M. The main complication is that we want to target a G, but can only send a signal to an M. Hence, the protocol we use is to simply mark the G for preemption (which we already do) and send the M a "wake up and look around" signal. The signal checks if it's running a G with a preemption request and stops it if so in the same way that stack check preemptions stop Gs. Since the preemption may fail (the G could be moved or the signal could arrive at an unsafe point), we keep a count of the number of received preemption signals. This lets stopG detect if its request failed and should be retried without an explicit channel back to suspendG. For #10958, #24543. Change-Id: I3e1538d5ea5200aeb434374abb5d5fdc56107e53 Reviewed-on: https://go-review.googlesource.com/c/go/+/201760 Run-TryBot: Austin Clements <austin@google.com> Reviewed-by: Cherry Zhang <cherryyz@google.com> |
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