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syncs, all: move to using Go's new atomic types instead of ours

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Fixes #5185

Change-Id: I850dd532559af78c3895e2924f8237ccc328449d
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-08-03 21:51:02 -07:00
committed by Brad Fitzpatrick
parent 9bb5a038e5
commit 4950fe60bd
20 changed files with 101 additions and 143 deletions
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23
derp/derp_server.go
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@ -41,7 +41,6 @@ import (
"tailscale.com/disco"
"tailscale.com/envknob"
"tailscale.com/metrics"
"tailscale.com/syncs"
"tailscale.com/types/key"
"tailscale.com/types/logger"
"tailscale.com/types/pad32"
@ -232,7 +231,7 @@ type dupClientSet struct {
}
func (s *dupClientSet) ActiveClient() *sclient {
if s.last != nil && !s.last.isDisabled.Get() {
if s.last != nil && !s.last.isDisabled.Load() {
return s.last
}
return nil
@ -499,8 +498,8 @@ func (s *Server) registerClient(c *sclient) {
s.dupClientConns.Add(2) // both old and new count
s.dupClientConnTotal.Add(1)
old := set.ActiveClient()
old.isDup.Set(true)
c.isDup.Set(true)
old.isDup.Store(true)
c.isDup.Store(true)
s.clients[c.key] = &dupClientSet{
last: c,
set: map[*sclient]bool{
@ -512,7 +511,7 @@ func (s *Server) registerClient(c *sclient) {
case *dupClientSet:
s.dupClientConns.Add(1) // the gauge
s.dupClientConnTotal.Add(1) // the counter
c.isDup.Set(true)
c.isDup.Store(true)
set.set[c] = true
set.last = c
set.sendHistory = append(set.sendHistory, c)
@ -571,8 +570,8 @@ func (s *Server) unregisterClient(c *sclient) {
if remain == nil {
panic("unexpected nil remain from single element dup set")
}
remain.isDisabled.Set(false)
remain.isDup.Set(false)
remain.isDisabled.Store(false)
remain.isDup.Store(false)
s.clients[c.key] = singleClient{remain}
}
}
@ -1073,11 +1072,11 @@ func (s *Server) sendServerKey(lw *lazyBufioWriter) error {
}
func (s *Server) noteClientActivity(c *sclient) {
if !c.isDup.Get() {
if !c.isDup.Load() {
// Fast path for clients that aren't in a dup set.
return
}
if c.isDisabled.Get() {
if c.isDisabled.Load() {
// If they're already disabled, no point checking more.
return
}
@ -1112,7 +1111,7 @@ func (s *Server) noteClientActivity(c *sclient) {
for _, prior := range ds.sendHistory {
if prior == c {
ds.ForeachClient(func(c *sclient) {
c.isDisabled.Set(true)
c.isDisabled.Store(true)
})
break
}
@ -1253,8 +1252,8 @@ type sclient struct {
peerGone chan key.NodePublic // write request that a previous sender has disconnected (not used by mesh peers)
meshUpdate chan struct{} // write request to write peerStateChange
canMesh bool // clientInfo had correct mesh token for inter-region routing
isDup syncs.AtomicBool // whether more than 1 sclient for key is connected
isDisabled syncs.AtomicBool // whether sends to this peer are disabled due to active/active dups
isDup atomic.Bool // whether more than 1 sclient for key is connected
isDisabled atomic.Bool // whether sends to this peer are disabled due to active/active dups
// replaceLimiter controls how quickly two connections with
// the same client key can kick each other off the server by