Make C/C++ tests pass

src/core/support/sync.c

@@ -118,7 +118,9 @@ void gpr_refn(gpr_refcount *r, int n) {
 }
 
 int gpr_unref(gpr_refcount *r) {
-  return gpr_atm_full_fetch_add(&r->count, -1) == 1;
+  gpr_atm prior = gpr_atm_full_fetch_add(&r->count, -1);
+  GPR_ASSERT(prior > 0);
+  return prior == 1;
 }
 
 void gpr_stats_init(gpr_stats_counter *c, gpr_intptr n) {

src/core/surface/server.c

@@ -144,6 +144,7 @@ struct grpc_server {
   requested_call_array requested_calls;
 
   gpr_uint8 shutdown;
+  gpr_uint8 shutdown_published;
   size_t num_shutdown_tags;
   shutdown_tag *shutdown_tags;
 
@@ -389,7 +390,8 @@ static int num_listeners(grpc_server *server) {
 
 static void maybe_finish_shutdown(grpc_server *server) {
   size_t i;
-  if (server->shutdown && server->lists[ALL_CALLS] == NULL && server->listeners_destroyed == num_listeners(server)) {
+  if (server->shutdown && !server->shutdown_published && server->lists[ALL_CALLS] == NULL && server->listeners_destroyed == num_listeners(server)) {
+    server->shutdown_published = 1;
     for (i = 0; i < server->num_shutdown_tags; i++) {
       grpc_cq_end_op(server->shutdown_tags[i].cq, server->shutdown_tags[i].tag,
                      NULL, 1);
@@ -456,8 +458,9 @@ static void server_on_recv(void *ptr, int success) {
         calld->state = ZOMBIED;
         grpc_iomgr_add_callback(kill_zombie, elem);
       }
-      call_list_remove(calld, ALL_CALLS);
+      if (call_list_remove(calld, ALL_CALLS)) {
         maybe_finish_shutdown(chand->server);
+      }
       gpr_mu_unlock(&chand->server->mu);
       break;
   }
@@ -822,9 +825,7 @@ void grpc_server_shutdown_and_notify(grpc_server *server,
 
   /* lock, and gather up some stuff to do */
   gpr_mu_lock(&server->mu);
-  for (i = 0; i < server->cq_count; i++) {
-    grpc_cq_begin_op(server->cqs[i], NULL);
-  }
+  grpc_cq_begin_op(cq, NULL);
   server->shutdown_tags =
       gpr_realloc(server->shutdown_tags,
                   sizeof(void *) * (server->num_shutdown_tags + 1));

src/cpp/server/server.cc

@@ -221,6 +221,9 @@ Server::~Server() {
       Shutdown();
     }
   }
+  void* got_tag;
+  bool ok;
+  GPR_ASSERT(!cq_.Next(&got_tag, &ok));
   grpc_server_destroy(server_);
   if (thread_pool_owned_) {
     delete thread_pool_;