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, 8 insertions, 0 deletions

diff --git a/src/core/lib/iomgr/ev_posix.cc b/src/core/lib/iomgr/ev_posix.cc
index 8a7dc7b004..c876eb08c5 100644
--- a/src/core/lib/iomgr/ev_posix.cc
+++ b/src/core/lib/iomgr/ev_posix.cc
@@ -244,6 +244,10 @@ bool grpc_event_engine_can_track_errors(void) {
 #endif /* GRPC_LINUX_ERRQUEUE */
 }
 
+bool grpc_event_engine_run_in_background(void) {
+  return g_event_engine->run_in_background;
+}
+
 grpc_fd* grpc_fd_create(int fd, const char* name, bool track_err) {
   GRPC_POLLING_API_TRACE("fd_create(%d, %s, %d)", fd, name, track_err);
   GRPC_FD_TRACE("fd_create(%d, %s, %d)", fd, name, track_err);
@@ -395,4 +399,8 @@ void grpc_pollset_set_del_fd(grpc_pollset_set* pollset_set, grpc_fd* fd) {
   g_event_engine->pollset_set_del_fd(pollset_set, fd);
 }
 
+void grpc_shutdown_background_closure(void) {
+  g_event_engine->shutdown_background_closure();
+}
+
 #endif  // GRPC_POSIX_SOCKET_EV