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Broadcaster writer goroutines must only finish when they are caught up

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Without this change, there was a narrow race condition that would allow
writers to finish when there was still data left to write. This is
likely to be what was causing some integration tests to fail with
truncated pull output.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
This commit is contained in:
Aaron Lehmann 2015-09-10 14:58:06 -07:00
parent 72f355e466
commit 947519bfb3
1 changed files with 7 additions and 3 deletions
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8
pkg/progressreader/broadcaster.go
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@ -77,6 +77,12 @@ func (broadcaster *Broadcaster) receiveWrites(observer io.Writer) {
broadcaster.Lock() broadcaster.Lock()
// If we are behind, we need to catch up instead of waiting
// or handling a closure.
if len(broadcaster.history) != n {
continue
}
// detect closure of the broadcast writer // detect closure of the broadcast writer
if broadcaster.closed() { if broadcaster.closed() {
broadcaster.Unlock() broadcaster.Unlock()
@ -84,9 +90,7 @@ func (broadcaster *Broadcaster) receiveWrites(observer io.Writer) {
return return
} }
if len(broadcaster.history) == n {
broadcaster.cond.Wait() broadcaster.cond.Wait()
}
// Mutex is still locked as the loop continues // Mutex is still locked as the loop continues
} }