Merge branch 'master' of github.com:grpc/grpc into rr_with_registry

19 files changed, 105 insertions, 46 deletions

diff --git a/src/core/client_config/connector.c b/src/core/client_config/connector.c
index a8cd5fc149..c1e583e4a5 100644
--- a/src/core/client_config/connector.c
+++ b/src/core/client_config/connector.c
@@ -47,3 +47,7 @@ void grpc_connector_connect(grpc_connector *connector,
                             grpc_iomgr_closure *notify) {
   connector->vtable->connect(connector, in_args, out_args, notify);
 }
+
+void grpc_connector_shutdown(grpc_connector *connector) {
+  connector->vtable->shutdown(connector);
+}
diff --git a/src/core/client_config/connector.h b/src/core/client_config/connector.h
index 39f3467990..01aa716412 100644
--- a/src/core/client_config/connector.h
+++ b/src/core/client_config/connector.h
@@ -70,6 +70,9 @@ typedef struct {
 struct grpc_connector_vtable {
   void (*ref)(grpc_connector *connector);
   void (*unref)(grpc_connector *connector);
+  /** Implementation of grpc_connector_shutdown */
+  void (*shutdown)(grpc_connector *connector);
+  /** Implementation of grpc_connector_connect */
   void (*connect)(grpc_connector *connector,
                   const grpc_connect_in_args *in_args,
                   grpc_connect_out_args *out_args, grpc_iomgr_closure *notify);
@@ -77,9 +80,12 @@ struct grpc_connector_vtable {
 
 void grpc_connector_ref(grpc_connector *connector);
 void grpc_connector_unref(grpc_connector *connector);
+/** Connect using the connector: max one outstanding call at a time */
 void grpc_connector_connect(grpc_connector *connector,
                             const grpc_connect_in_args *in_args,
                             grpc_connect_out_args *out_args,
                             grpc_iomgr_closure *notify);
+/** Cancel any pending connection */
+void grpc_connector_shutdown(grpc_connector *connector);
 
 #endif
diff --git a/src/core/client_config/resolvers/zookeeper_resolver.c b/src/core/client_config/resolvers/zookeeper_resolver.c
index e425913cd0..2594e6fae9 100644
--- a/src/core/client_config/resolvers/zookeeper_resolver.c
+++ b/src/core/client_config/resolvers/zookeeper_resolver.c
@@ -182,6 +182,7 @@ static void zookeeper_on_resolved(void *arg,
   grpc_lb_policy *lb_policy;
   size_t i;
   if (addresses != NULL) {
+    grpc_lb_policy_args lb_policy_args;
     config = grpc_client_config_create();
     subchannels = gpr_malloc(sizeof(grpc_subchannel *) * addresses->naddrs);
     for (i = 0; i < addresses->naddrs; i++) {
@@ -191,8 +192,10 @@ static void zookeeper_on_resolved(void *arg,
       subchannels[i] = grpc_subchannel_factory_create_subchannel(
           r->subchannel_factory, &args);
     }
+    lb_policy_args.subchannels = subchannels;
+    lb_policy_args.num_subchannels = addresses->naddrs;
     lb_policy =
-        grpc_lb_policy_create(r->lb_policy_name, subchannels, addresses->naddrs);
+        grpc_lb_policy_create(r->lb_policy_name, &lb_policy_args);
     grpc_client_config_set_lb_policy(config, lb_policy);
     GRPC_LB_POLICY_UNREF(lb_policy, "construction");
     grpc_resolved_addresses_destroy(addresses);
diff --git a/src/core/client_config/subchannel.c b/src/core/client_config/subchannel.c
index ca52c75beb..876d2aa418 100644
--- a/src/core/client_config/subchannel.c
+++ b/src/core/client_config/subchannel.c
@@ -439,6 +439,10 @@ void grpc_subchannel_process_transport_op(grpc_subchannel *c,
   if (cancel_alarm) {
     grpc_alarm_cancel(&c->alarm);
   }
+
+  if (op->disconnect) {
+    grpc_connector_shutdown(c->connector);
+  }
 }
 
 static void on_state_changed(void *p, int iomgr_success) {
diff --git a/src/core/iomgr/fd_posix.c b/src/core/iomgr/fd_posix.c
index 2d08a77a70..38a543e36e 100644
--- a/src/core/iomgr/fd_posix.c
+++ b/src/core/iomgr/fd_posix.c
@@ -213,10 +213,9 @@ void grpc_fd_orphan(grpc_fd *fd, grpc_iomgr_closure *on_done,
                     const char *reason) {
   fd->on_done_closure = on_done;
   shutdown(fd->fd, SHUT_RDWR);
-  REF_BY(fd, 1, reason); /* remove active status, but keep referenced */
   gpr_mu_lock(&fd->watcher_mu);
+  REF_BY(fd, 1, reason); /* remove active status, but keep referenced */
   if (!has_watchers(fd)) {
-    GPR_ASSERT(!fd->closed);
     fd->closed = 1;
     close(fd->fd);
     if (fd->on_done_closure) {
diff --git a/src/core/iomgr/iomgr.c b/src/core/iomgr/iomgr.c
index 1dd03992ae..d6ca5d1f71 100644
--- a/src/core/iomgr/iomgr.c
+++ b/src/core/iomgr/iomgr.c
@@ -34,16 +34,18 @@
 #include "src/core/iomgr/iomgr.h"
 
 #include <stdlib.h>
+#include <string.h>
 
-#include "src/core/iomgr/iomgr_internal.h"
-#include "src/core/iomgr/alarm_internal.h"
-#include "src/core/support/string.h"
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc/support/string_util.h>
 #include <grpc/support/sync.h>
 #include <grpc/support/thd.h>
 
+#include "src/core/iomgr/iomgr_internal.h"
+#include "src/core/iomgr/alarm_internal.h"
+#include "src/core/support/string.h"
+
 static gpr_mu g_mu;
 static gpr_cv g_rcv;
 static grpc_iomgr_closure *g_cbs_head = NULL;
@@ -179,6 +181,8 @@ void grpc_iomgr_shutdown(void) {
   }
   gpr_mu_unlock(&g_mu);
 
+  memset(&g_root_object, 0, sizeof(g_root_object));
+
   grpc_kick_poller();
   gpr_event_wait(&g_background_callback_executor_done,
                  gpr_inf_future(GPR_CLOCK_REALTIME));
diff --git a/src/core/iomgr/pollset_multipoller_with_epoll.c b/src/core/iomgr/pollset_multipoller_with_epoll.c
index 8f62ce2954..481bdc4ede 100644
--- a/src/core/iomgr/pollset_multipoller_with_epoll.c
+++ b/src/core/iomgr/pollset_multipoller_with_epoll.c
@@ -72,7 +72,7 @@ static void finally_add_fd(grpc_pollset *pollset, grpc_fd *fd) {
      to this pollset whilst adding, but that should be benign. */
   GPR_ASSERT(grpc_fd_begin_poll(fd, pollset, 0, 0, &watcher) == 0);
   if (watcher.fd != NULL) {
-    ev.events = EPOLLIN | EPOLLOUT | EPOLLET;
+    ev.events = (uint32_t)(EPOLLIN | EPOLLOUT | EPOLLET);
     ev.data.ptr = fd;
     err = epoll_ctl(h->epoll_fd, EPOLL_CTL_ADD, fd->fd, &ev);
     if (err < 0) {
diff --git a/src/core/iomgr/pollset_posix.c b/src/core/iomgr/pollset_posix.c
index dec2f5490f..f3e424e83c 100644
--- a/src/core/iomgr/pollset_posix.c
+++ b/src/core/iomgr/pollset_posix.c
@@ -187,6 +187,12 @@ void grpc_pollset_work(grpc_pollset *pollset, grpc_pollset_worker *worker,
   if (pollset->shutting_down) {
     goto done;
   }
+  if (pollset->in_flight_cbs) {
+    /* Give do_promote priority so we don't starve it out */
+    gpr_mu_unlock(&pollset->mu);
+    gpr_mu_lock(&pollset->mu);
+    goto done;
+  }
   if (!pollset->kicked_without_pollers) {
     push_front_worker(pollset, worker);
     added_worker = 1;
@@ -422,12 +428,6 @@ static void basic_pollset_maybe_work(grpc_pollset *pollset,
   int r;
   nfds_t nfds;
 
-  if (pollset->in_flight_cbs) {
-    /* Give do_promote priority so we don't starve it out */
-    gpr_mu_unlock(&pollset->mu);
-    gpr_mu_lock(&pollset->mu);
-    return;
-  }
   fd = pollset->data.ptr;
   if (fd && grpc_fd_is_orphaned(fd)) {
     GRPC_FD_UNREF(fd, "basicpoll");
diff --git a/src/core/iomgr/tcp_client_posix.c b/src/core/iomgr/tcp_client_posix.c
index c3668f6a92..07fa44ad37 100644
--- a/src/core/iomgr/tcp_client_posix.c
+++ b/src/core/iomgr/tcp_client_posix.c
@@ -54,6 +54,8 @@
 #include <grpc/support/string_util.h>
 #include <grpc/support/time.h>
 
+extern int grpc_tcp_trace;
+
 typedef struct {
   void (*cb)(void *arg, grpc_endpoint *tcp);
   void *cb_arg;
@@ -92,6 +94,10 @@ error:
 static void tc_on_alarm(void *acp, int success) {
   int done;
   async_connect *ac = acp;
+  if (grpc_tcp_trace) {
+    gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: on_alarm: success=%d", ac->addr_str,
+            success);
+  }
   gpr_mu_lock(&ac->mu);
   if (ac->fd != NULL) {
     grpc_fd_shutdown(ac->fd);
@@ -116,6 +122,11 @@ static void on_writable(void *acp, int success) {
   void *cb_arg = ac->cb_arg;
   grpc_fd *fd;
 
+  if (grpc_tcp_trace) {
+    gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: on_writable: success=%d",
+            ac->addr_str, success);
+  }
+
   gpr_mu_lock(&ac->mu);
   GPR_ASSERT(ac->fd);
   fd = ac->fd;
@@ -264,6 +275,11 @@ void grpc_tcp_client_connect(void (*cb)(void *arg, grpc_endpoint *ep),
   ac->write_closure.cb = on_writable;
   ac->write_closure.cb_arg = ac;
 
+  if (grpc_tcp_trace) {
+    gpr_log(GPR_DEBUG, "CLIENT_CONNECT: %s: asynchronously connecting",
+            ac->addr_str);
+  }
+
   gpr_mu_lock(&ac->mu);
   grpc_alarm_init(&ac->alarm,
                   gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC),
diff --git a/src/core/iomgr/tcp_client_windows.c b/src/core/iomgr/tcp_client_windows.c
index 05198dbff4..a42ec7cf11 100644
--- a/src/core/iomgr/tcp_client_windows.c
+++ b/src/core/iomgr/tcp_client_windows.c
@@ -77,7 +77,6 @@ static void on_alarm(void *acp, int occured) {
   async_connect *ac = acp;
   gpr_mu_lock(&ac->mu);
   /* If the alarm didn't occur, it got cancelled. */
-  gpr_log(GPR_DEBUG, "on_alarm: %p", ac->socket);
   if (ac->socket != NULL && occured) {
     grpc_winsocket_shutdown(ac->socket);
   }
@@ -96,8 +95,6 @@ static void on_connect(void *acp, int from_iocp) {
 
   gpr_mu_lock(&ac->mu);
 
-  gpr_log(GPR_DEBUG, "on_connect: %p", ac->socket);
-
   if (from_iocp) {
     DWORD transfered_bytes = 0;
     DWORD flags;
diff --git a/src/core/iomgr/tcp_server_posix.c b/src/core/iomgr/tcp_server_posix.c
index bcbd0afe6b..a3cd3bbda2 100644
--- a/src/core/iomgr/tcp_server_posix.c
+++ b/src/core/iomgr/tcp_server_posix.c
@@ -339,6 +339,10 @@ static void on_read(void *arg, int success) {
     addr_str = grpc_sockaddr_to_uri((struct sockaddr *)&addr);
     gpr_asprintf(&name, "tcp-server-connection:%s", addr_str);
 
+    if (grpc_tcp_trace) {
+      gpr_log(GPR_DEBUG, "SERVER_CONNECT: incoming connection: %s", addr_str);
+    }
+
     fdobj = grpc_fd_create(fd, name);
     /* TODO(ctiller): revise this when we have server-side sharding
        of channels -- we certainly should not be automatically adding every
diff --git a/src/core/iomgr/udp_server.c b/src/core/iomgr/udp_server.c
index ed9eee8726..7957066598 100644
--- a/src/core/iomgr/udp_server.c
+++ b/src/core/iomgr/udp_server.c
@@ -94,9 +94,6 @@ static void unlink_if_unix_domain_socket(const struct sockaddr_un *un) {
 
 /* the overall server */
 struct grpc_udp_server {
-  grpc_udp_server_cb cb;
-  void *cb_arg;
-
   gpr_mu mu;
   gpr_cv cv;
 
@@ -130,8 +127,6 @@ grpc_udp_server *grpc_udp_server_create(void) {
   s->active_ports = 0;
   s->destroyed_ports = 0;
   s->shutdown = 0;
-  s->cb = NULL;
-  s->cb_arg = NULL;
   s->ports = gpr_malloc(sizeof(server_port) * INIT_PORT_CAP);
   s->nports = 0;
   s->port_capacity = INIT_PORT_CAP;
@@ -232,6 +227,11 @@ static int prepare_socket(int fd, const struct sockaddr *addr,
     goto error;
   }
 
+  if (!grpc_set_socket_nonblocking(fd, 1) || !grpc_set_socket_cloexec(fd, 1)) {
+    gpr_log(GPR_ERROR, "Unable to configure socket %d: %s", fd,
+            strerror(errno));
+  }
+
   get_local_ip = 1;
   rc = setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &get_local_ip,
                   sizeof(get_local_ip));
@@ -282,7 +282,7 @@ static void on_read(void *arg, int success) {
 
   /* Tell the registered callback that data is available to read. */
   GPR_ASSERT(sp->read_cb);
-  sp->read_cb(sp->fd, sp->server->cb, sp->server->cb_arg);
+  sp->read_cb(sp->fd);
 
   /* Re-arm the notification event so we get another chance to read. */
   grpc_fd_notify_on_read(sp->emfd, &sp->read_closure);
@@ -301,7 +301,6 @@ static int add_socket_to_server(grpc_udp_server *s, int fd,
     grpc_sockaddr_to_string(&addr_str, (struct sockaddr *)&addr, 1);
     gpr_asprintf(&name, "udp-server-listener:%s", addr_str);
     gpr_mu_lock(&s->mu);
-    GPR_ASSERT(!s->cb && "must add ports before starting server");
     /* append it to the list under a lock */
     if (s->nports == s->port_capacity) {
       s->port_capacity *= 2;
@@ -407,15 +406,10 @@ int grpc_udp_server_get_fd(grpc_udp_server *s, unsigned index) {
 }
 
 void grpc_udp_server_start(grpc_udp_server *s, grpc_pollset **pollsets,
-                           size_t pollset_count,
-                           grpc_udp_server_cb new_transport_cb, void *cb_arg) {
+                           size_t pollset_count) {
   size_t i, j;
-  GPR_ASSERT(new_transport_cb);
   gpr_mu_lock(&s->mu);
-  GPR_ASSERT(!s->cb);
   GPR_ASSERT(s->active_ports == 0);
-  s->cb = new_transport_cb;
-  s->cb_arg = cb_arg;
   s->pollsets = pollsets;
   for (i = 0; i < s->nports; i++) {
     for (j = 0; j < pollset_count; j++) {
diff --git a/src/core/iomgr/udp_server.h b/src/core/iomgr/udp_server.h
index 389f84ecca..c930e81cbc 100644
--- a/src/core/iomgr/udp_server.h
+++ b/src/core/iomgr/udp_server.h
@@ -39,21 +39,15 @@
 /* Forward decl of grpc_udp_server */
 typedef struct grpc_udp_server grpc_udp_server;
 
-/* New server callback: ep is the newly connected connection */
-typedef void (*grpc_udp_server_cb)(void *arg, grpc_endpoint *ep);
-
 /* Called when data is available to read from the socket. */
-typedef void (*grpc_udp_server_read_cb)(int fd,
-                                        grpc_udp_server_cb new_transport_cb,
-                                        void *cb_arg);
+typedef void (*grpc_udp_server_read_cb)(int fd);
 
 /* Create a server, initially not bound to any ports */
 grpc_udp_server *grpc_udp_server_create(void);
 
 /* Start listening to bound ports */
-void grpc_udp_server_start(grpc_udp_server *server, grpc_pollset **pollsets,
-                           size_t pollset_count, grpc_udp_server_cb cb,
-                           void *cb_arg);
+void grpc_udp_server_start(grpc_udp_server *udp_server, grpc_pollset **pollsets,
+                           size_t pollset_count);
 
 int grpc_udp_server_get_fd(grpc_udp_server *s, unsigned index);
 
diff --git a/src/core/support/log_posix.c b/src/core/support/log_posix.c
index 021c4666d4..8b050dbee7 100644
--- a/src/core/support/log_posix.c
+++ b/src/core/support/log_posix.c
@@ -64,7 +64,7 @@ void gpr_log(const char *file, int line, gpr_log_severity severity,
   } else {
     message = allocated = gpr_malloc((size_t)ret + 1);
     va_start(args, format);
-    vsnprintf(message, ret + 1, format, args);
+    vsnprintf(message, (size_t)(ret + 1), format, args);
     va_end(args);
   }
   gpr_log_message(file, line, severity, message);
diff --git a/src/core/support/string.c b/src/core/support/string.c
index af0389ea83..e0ffeb8a4a 100644
--- a/src/core/support/string.c
+++ b/src/core/support/string.c
@@ -101,7 +101,7 @@ static void asciidump(dump_out *out, const char *buf, size_t len) {
     dump_out_append(out, '\'');
   }
   for (cur = beg; cur != end; ++cur) {
-    dump_out_append(out, isprint(*cur) ? *(char *)cur : '.');
+    dump_out_append(out, (char)(isprint(*cur) ? *(char *)cur : '.'));
   }
   if (!out_was_empty) {
     dump_out_append(out, '\'');
diff --git a/src/core/surface/channel_create.c b/src/core/surface/channel_create.c
index 9e2cf1cf66..d323d0d74f 100644
--- a/src/core/surface/channel_create.c
+++ b/src/core/surface/channel_create.c
@@ -88,6 +88,8 @@ static void connected(void *arg, grpc_endpoint *tcp) {
   grpc_iomgr_add_callback(notify);
 }
 
+static void connector_shutdown(grpc_connector *con) {}
+
 static void connector_connect(grpc_connector *con,
                               const grpc_connect_in_args *args,
                               grpc_connect_out_args *result,
@@ -103,7 +105,7 @@ static void connector_connect(grpc_connector *con,
 }
 
 static const grpc_connector_vtable connector_vtable = {
-    connector_ref, connector_unref, connector_connect};
+    connector_ref, connector_unref, connector_shutdown, connector_connect};
 
 typedef struct {
   grpc_subchannel_factory base;
diff --git a/src/core/surface/secure_channel_create.c b/src/core/surface/secure_channel_create.c
index 9b554eeb70..52c5e93988 100644
--- a/src/core/surface/secure_channel_create.c
+++ b/src/core/surface/secure_channel_create.c
@@ -61,6 +61,9 @@ typedef struct {
   grpc_iomgr_closure *notify;
   grpc_connect_in_args args;
   grpc_connect_out_args *result;
+
+  gpr_mu mu;
+  grpc_endpoint *connecting_endpoint;
 } connector;
 
 static void connector_ref(grpc_connector *con) {
@@ -81,10 +84,20 @@ static void on_secure_transport_setup_done(void *arg,
                                            grpc_endpoint *secure_endpoint) {
   connector *c = arg;
   grpc_iomgr_closure *notify;
-  if (status != GRPC_SECURITY_OK) {
+  gpr_mu_lock(&c->mu);
+  if (c->connecting_endpoint == NULL) {
+    memset(c->result, 0, sizeof(*c->result));
+    gpr_mu_unlock(&c->mu);
+  } else if (status != GRPC_SECURITY_OK) {
+    GPR_ASSERT(c->connecting_endpoint == wrapped_endpoint);
     gpr_log(GPR_ERROR, "Secure transport setup failed with error %d.", status);
     memset(c->result, 0, sizeof(*c->result));
+    c->connecting_endpoint = NULL;
+    gpr_mu_unlock(&c->mu);
   } else {
+    GPR_ASSERT(c->connecting_endpoint == wrapped_endpoint);
+    c->connecting_endpoint = NULL;
+    gpr_mu_unlock(&c->mu);
     c->result->transport = grpc_create_chttp2_transport(
         c->args.channel_args, secure_endpoint, c->args.metadata_context, 1);
     grpc_chttp2_transport_start_reading(c->result->transport, NULL, 0);
@@ -102,6 +115,10 @@ static void connected(void *arg, grpc_endpoint *tcp) {
   connector *c = arg;
   grpc_iomgr_closure *notify;
   if (tcp != NULL) {
+    gpr_mu_lock(&c->mu);
+    GPR_ASSERT(c->connecting_endpoint == NULL);
+    c->connecting_endpoint = tcp;
+    gpr_mu_unlock(&c->mu);
     grpc_setup_secure_transport(&c->security_connector->base, tcp,
                                 on_secure_transport_setup_done, c);
   } else {
@@ -112,6 +129,18 @@ static void connected(void *arg, grpc_endpoint *tcp) {
   }
 }
 
+static void connector_shutdown(grpc_connector *con) {
+  connector *c = (connector *)con;
+  grpc_endpoint *ep;
+  gpr_mu_lock(&c->mu);
+  ep = c->connecting_endpoint;
+  c->connecting_endpoint = NULL;
+  gpr_mu_unlock(&c->mu);
+  if (ep) {
+    grpc_endpoint_shutdown(ep);
+  }
+}
+
 static void connector_connect(grpc_connector *con,
                               const grpc_connect_in_args *args,
                               grpc_connect_out_args *result,
@@ -122,12 +151,15 @@ static void connector_connect(grpc_connector *con,
   c->notify = notify;
   c->args = *args;
   c->result = result;
+  gpr_mu_lock(&c->mu);
+  GPR_ASSERT(c->connecting_endpoint == NULL);
+  gpr_mu_unlock(&c->mu);
   grpc_tcp_client_connect(connected, c, args->interested_parties, args->addr,
                           args->addr_len, args->deadline);
 }
 
 static const grpc_connector_vtable connector_vtable = {
-    connector_ref, connector_unref, connector_connect};
+    connector_ref, connector_unref, connector_shutdown, connector_connect};
 
 typedef struct {
   grpc_subchannel_factory base;
diff --git a/src/core/transport/chttp2/parsing.c b/src/core/transport/chttp2/parsing.c
index a592ce7d28..f26f446787 100644
--- a/src/core/transport/chttp2/parsing.c
+++ b/src/core/transport/chttp2/parsing.c
@@ -486,7 +486,7 @@ static int init_skip_frame_parser(
     transport_parsing->hpack_parser.on_header_user_data = NULL;
     transport_parsing->hpack_parser.is_boundary = is_eoh;
     transport_parsing->hpack_parser.is_eof =
-        is_eoh ? transport_parsing->header_eof : 0;
+        (gpr_uint8)(is_eoh ? transport_parsing->header_eof : 0);
   } else {
     transport_parsing->parser = skip_parser;
   }
@@ -696,7 +696,7 @@ static int init_header_frame_parser(
   transport_parsing->hpack_parser.on_header_user_data = transport_parsing;
   transport_parsing->hpack_parser.is_boundary = is_eoh;
   transport_parsing->hpack_parser.is_eof =
-      is_eoh ? transport_parsing->header_eof : 0;
+      (gpr_uint8)(is_eoh ? transport_parsing->header_eof : 0);
   if (!is_continuation && (transport_parsing->incoming_frame_flags &
                            GRPC_CHTTP2_FLAG_HAS_PRIORITY)) {
     grpc_chttp2_hpack_parser_set_has_priority(&transport_parsing->hpack_parser);
diff --git a/src/csharp/ext/grpc_csharp_ext.c b/src/csharp/ext/grpc_csharp_ext.c
index 70c0fbcc50..51e0728fb9 100644
--- a/src/csharp/ext/grpc_csharp_ext.c
+++ b/src/csharp/ext/grpc_csharp_ext.c
@@ -252,7 +252,7 @@ GPR_EXPORT gpr_intptr GPR_CALLTYPE grpcsharp_batch_context_recv_message_length(
   if (!ctx->recv_message) {
     return -1;
   }
-  return grpc_byte_buffer_length(ctx->recv_message);
+  return (gpr_intptr)grpc_byte_buffer_length(ctx->recv_message);
 }
 
 /*