From f7bbdc31a0065e3d5a68a3e6c7a7449954fdd339 Mon Sep 17 00:00:00 2001
From: Josh Bleecher Snyder <josh@tailscale.com>
Date: Tue, 15 Dec 2020 17:44:21 -0800
Subject: device: fix data race in peer.timersActive

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>
---
 device/peer.go | 1 +
 1 file changed, 1 insertion(+)

(limited to 'device/peer.go')

diff --git a/device/peer.go b/device/peer.go
index fe6de33..73e6083 100644
--- a/device/peer.go
+++ b/device/peer.go
@@ -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
 
-- 
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