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device: fix data race in peer.timersActive

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Found by the race detector and existing tests.

To avoid introducing a lock into this hot path,
calculate and cache whether any peers exist.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder 2020-12-15 17:44:21 -08:00 • committed by Jason A. Donenfeld
parent 70861686d3
commit f7bbdc31a0
3 changed files with 6 additions and 3 deletions
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1
device/peer.go
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@ -125,6 +125,7 @@ func (device *Device) NewPeer(pk NoisePublicKey) (*Peer, error) {
// add
device.peers.keyMap[pk] = peer
device.peers.empty.Set(false)
// start peer