pause and unpause netmgr in isc_nm_destroy to flush all events from worker queues

diff --git a/lib/isc/netmgr/netmgr.c b/lib/isc/netmgr/netmgr.c
index 636c919730df1ba197d361a98d2fc181c38065a0..0713aa42fcf7c96d446c7d8368500d96a00650a0 100644 (file)
--- a/lib/isc/netmgr/netmgr.c
+++ b/lib/isc/netmgr/netmgr.c
@@ -337,6 +337,14 @@ isc_nm_destroy(isc_nm_t **mgr0) {
         * Wait for the manager to be dereferenced elsewhere.
         */
        while (isc_refcount_current(&mgr->references) > 1) {
+               /*
+                * Sometimes libuv gets stuck, pausing and unpausing
+                * netmgr goes over all events in async queue for all
+                * the workers, and since it's done only on shutdown it
+                * doesn't cost us anything.
+                */
+               isc_nm_pause(mgr);
+               isc_nm_resume(mgr);
 #ifdef WIN32
                _sleep(1000);
 #else