Fix server shutdown

A previous fix to make close() occur later can cause socket reuse by servers to fail as previous sockets are left asynchronously open.

This change:
- adds a callback to TCP server shutdown to signal that the server is completely shutdown
- wait for that callback before destroying listeners in the server (and before destroying the server)
- handles fallout

1 files changed, 2 insertions, 0 deletions

diff --git a/src/core/surface/server.h b/src/core/surface/server.h
index e33f69b8c7..548a16c6c9 100644
--- a/src/core/surface/server.h
+++ b/src/core/surface/server.h
@@ -51,6 +51,8 @@ void grpc_server_add_listener(grpc_server *server, void *listener,
                                             grpc_pollset **pollsets, size_t npollsets),
                               void (*destroy)(grpc_server *server, void *arg));
 
+void grpc_server_listener_destroy_done(void *server);
+
 /* Setup a transport - creates a channel stack, binds the transport to the
    server */
 grpc_transport_setup_result grpc_server_setup_transport(