diff options
Diffstat (limited to 'pkg/p9/server.go')
| -rw-r--r-- | pkg/p9/server.go | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/pkg/p9/server.go b/pkg/p9/server.go index 8c5c434fd..290d5b9ce 100644 --- a/pkg/p9/server.go +++ b/pkg/p9/server.go @@ -81,8 +81,8 @@ type connState struct { // version 0 implies 9P2000.L. version uint32 - // pendingWg counts requests that are still being handled. - pendingWg sync.WaitGroup + // reqGate counts requests that are still being handled. + reqGate sync.Gate // -- below relates to the legacy handler -- @@ -481,9 +481,13 @@ func (cs *connState) lookupChannel(id uint32) *channel { // handle handles a single message. func (cs *connState) handle(m message) (r message) { - cs.pendingWg.Add(1) + if !cs.reqGate.Enter() { + // connState.stop() has been called; the connection is shutting down. + r = newErr(syscall.ECONNRESET) + return + } defer func() { - cs.pendingWg.Done() + cs.reqGate.Leave() if r == nil { // Don't allow a panic to propagate. err := recover() @@ -594,10 +598,11 @@ func (cs *connState) handleRequests() { } func (cs *connState) stop() { - // Wait for completion of all inflight requests. This is mostly so that if - // a request is stuck, the sandbox supervisor has the opportunity to kill - // us with SIGABRT to get a stack dump of the offending handler. - cs.pendingWg.Wait() + // Stop new requests from proceeding, and wait for completion of all + // inflight requests. This is mostly so that if a request is stuck, the + // sandbox supervisor has the opportunity to kill us with SIGABRT to get a + // stack dump of the offending handler. + cs.reqGate.Close() // Free the channels. cs.channelMu.Lock() |