Extend ev_posix.* to prepare for the new background poller 'epollbg',

and get rid of the dependency loop on the grpc shutdown path. Make sure
all background closures are complete before shutting down the other grpc
modules.

Avoid using the backup poller in TCP endpoints if using the background
poller.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/core/lib/iomgr/ev_poll_posix.cc b/src/core/lib/iomgr/ev_poll_posix.cc
index 16562538a6..67cbfbbd02 100644
--- a/src/core/lib/iomgr/ev_poll_posix.cc
+++ b/src/core/lib/iomgr/ev_poll_posix.cc
@@ -1782,6 +1782,8 @@ static void global_cv_fd_table_shutdown() {
  * event engine binding
  */
 
+static void shutdown_background_closure(void) {}
+
 static void shutdown_engine(void) {
   pollset_global_shutdown();
   if (grpc_cv_wakeup_fds_enabled()) {
@@ -1796,6 +1798,7 @@ static void shutdown_engine(void) {
 static const grpc_event_engine_vtable vtable = {
     sizeof(grpc_pollset),
     false,
+    false,
 
     fd_create,
     fd_wrapped_fd,
@@ -1825,6 +1828,7 @@ static const grpc_event_engine_vtable vtable = {
     pollset_set_add_fd,
     pollset_set_del_fd,
 
+    shutdown_background_closure,
     shutdown_engine,
 };