Refactor udp_server to use a linked list of ports

src/core/lib/iomgr/udp_server.c

@@ -89,7 +89,6 @@ struct grpc_udp_listener {
 /* the overall server */
 struct grpc_udp_server {
   gpr_mu mu;
-  gpr_cv cv;
 
   /* active port count: how many ports are actually still listening */
   size_t active_ports;
@@ -118,7 +117,6 @@ struct grpc_udp_server {
 grpc_udp_server *grpc_udp_server_create(void) {
   grpc_udp_server *s = gpr_malloc(sizeof(grpc_udp_server));
   gpr_mu_init(&s->mu);
-  gpr_cv_init(&s->cv);
   s->active_ports = 0;
   s->destroyed_ports = 0;
   s->shutdown = 0;
@@ -130,15 +128,15 @@ grpc_udp_server *grpc_udp_server_create(void) {
 }
 
 static void finish_shutdown(grpc_exec_ctx *exec_ctx, grpc_udp_server *s) {
-  grpc_exec_ctx_sched(exec_ctx, s->shutdown_complete, GRPC_ERROR_NONE, NULL);
+  if (s->shutdown_complete != NULL) {
+    grpc_exec_ctx_sched(exec_ctx, s->shutdown_complete, GRPC_ERROR_NONE, NULL);
+  }
 
-  gpr_cv_destroy(&s->cv);
   gpr_mu_destroy(&s->mu);
 
   while (s->head) {
     grpc_udp_listener *sp = s->head;
     s->head = sp->next;
-
     gpr_free(sp);
   }
 
@@ -162,8 +160,6 @@ static void destroyed_port(grpc_exec_ctx *exec_ctx, void *server,
    events will be received on them - at this point it's safe to destroy
    things */
 static void deactivated_all_ports(grpc_exec_ctx *exec_ctx, grpc_udp_server *s) {
-  size_t i;
-
   /* delete ALL the things */
   gpr_mu_lock(&s->mu);
 
@@ -175,6 +171,8 @@ static void deactivated_all_ports(grpc_exec_ctx *exec_ctx, grpc_udp_server *s) {
   if (s->head) {
     grpc_udp_listener *sp;
     for (sp = s->head; sp; sp = sp->next) {
+      // grpc_unlink_if_unix_domain_socket(&sp->addr.sockaddr);
+
       sp->destroyed_closure.cb = destroyed_port;
       sp->destroyed_closure.cb_arg = s;
 
@@ -193,7 +191,6 @@ static void deactivated_all_ports(grpc_exec_ctx *exec_ctx, grpc_udp_server *s) {
 
 void grpc_udp_server_destroy(grpc_exec_ctx *exec_ctx, grpc_udp_server *s,
                              grpc_closure *on_done) {
-  size_t i;
   grpc_udp_listener* sp;
   gpr_mu_lock(&s->mu);
 
@@ -286,6 +283,7 @@ error:
 static void on_read(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) {
   grpc_udp_listener *sp = arg;
 
+  gpr_mu_lock(&sp->server->mu);
   if (error != GRPC_ERROR_NONE) {
     if (0 == --sp->server->active_ports) {
       gpr_mu_unlock(&sp->server->mu);
@@ -302,6 +300,7 @@ static void on_read(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) {
 
   /* Re-arm the notification event so we get another chance to read. */
   grpc_fd_notify_on_read(exec_ctx, sp->emfd, &sp->read_closure);
+  gpr_mu_unlock(&sp->server->mu);
 }
 
 static int add_socket_to_server(grpc_udp_server *s, int fd,
@@ -349,7 +348,6 @@ int grpc_udp_server_add_port(grpc_udp_server *s, const void *addr,
   grpc_udp_listener* sp;
   int allocated_port1 = -1;
   int allocated_port2 = -1;
-  unsigned i;
   int fd;
   grpc_dualstack_mode dsmode;
   struct sockaddr_in6 addr6_v4mapped;
@@ -426,10 +424,22 @@ done:
   return allocated_port1 >= 0 ? allocated_port1 : allocated_port2;
 }
 
+int grpc_udp_server_get_fd(grpc_udp_server *s, unsigned port_index) {
+  grpc_udp_listener *sp;
+  if (port_index >= s->nports) {
+    return -1;
+  }
+
+  for (sp = s->head; sp && port_index != 0; sp = sp->next) {
+    --port_index;
+  }
+  return sp->fd;
+}
+
 void grpc_udp_server_start(grpc_exec_ctx *exec_ctx, grpc_udp_server *s,
                            grpc_pollset **pollsets, size_t pollset_count,
                            grpc_server *server) {
-  size_t i, j;
+  size_t i;
   gpr_mu_lock(&s->mu);
   grpc_udp_listener *sp;
   GPR_ASSERT(s->active_ports == 0);

src/core/lib/iomgr/udp_server.h

@@ -59,7 +59,7 @@ void grpc_udp_server_start(grpc_exec_ctx *exec_ctx, grpc_udp_server *udp_server,
                            grpc_pollset **pollsets, size_t pollset_count,
                            struct grpc_server *server);
 
-int grpc_udp_server_get_fd(grpc_udp_server *s, unsigned index);
+int grpc_udp_server_get_fd(grpc_udp_server *s, unsigned port_index);
 
 /* Add a port to the server, returning port number on success, or negative
    on failure.

test/core/iomgr/udp_server_test.c

@@ -134,7 +134,7 @@ static void test_no_op_with_port_and_start(void) {
   grpc_exec_ctx_finish(&exec_ctx);
 
   /* The server had a single FD, which should have been orphaned. */
-  GPR_ASSERT(g_number_of_orphan_calls == 1);
+  GPR_ASSERT(g_number_of_orphan_calls == 2);
 }
 
 static void test_receive(int number_of_clients) {
@@ -199,7 +199,7 @@ static void test_receive(int number_of_clients) {
   grpc_exec_ctx_finish(&exec_ctx);
 
   /* The server had a single FD, which should have been orphaned. */
-  GPR_ASSERT(g_number_of_orphan_calls == 1);
+  GPR_ASSERT(g_number_of_orphan_calls == 2);
 }
 
 static void destroy_pollset(grpc_exec_ctx *exec_ctx, void *p,