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channel.go: avoid race condition by synchronizing ch.send calls #499

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channel.go: avoid race condition by synchronizing ch.send calls #499

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5 changes: 5 additions & 0 deletions channel.go
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Original file line number Diff line number Diff line change
Expand Up @@ -168,6 +168,9 @@ func (ch *Channel) open() error {
// Performs a request/response call for when the message is not NoWait and is
// specified as Synchronous.
func (ch *Channel) call(req message, res ...message) error {
ch.m.Lock()
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Isn't there a lock implemented on the connection object c.sendM before writing to the frame. That should be doing the same thing, right?

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This is indeed typically done at connection level by various clients. We have to be really careful here as throughput effects of locking on the hot path can be very serious or even catastrophic for some systems.

defer ch.m.Unlock()

if err := ch.send(req); err != nil {
return err
}
Expand Down Expand Up @@ -288,7 +291,9 @@ func (ch *Channel) dispatch(msg message) {
c <- m.Active
}
ch.notifyM.RUnlock()
ch.m.Lock()
ch.send(&channelFlowOk{Active: m.Active})
ch.m.Unlock()

case *basicCancel:
ch.notifyM.RLock()
Expand Down