Merge pull request #11871 from murgatroid99/uv_portability_fix

Fix libuv core portability tests

23 files changed, 186 insertions, 45 deletions

diff --git a/BUILD b/BUILD
index 5c2e2f976a..6dcc76eb7a 100644
--- a/BUILD
+++ b/BUILD
@@ -721,6 +721,7 @@ grpc_cc_library(
         "src/core/lib/iomgr/iomgr.h",
         "src/core/lib/iomgr/iomgr_internal.h",
         "src/core/lib/iomgr/iomgr_posix.h",
+        "src/core/lib/iomgr/iomgr_uv.h",
         "src/core/lib/iomgr/is_epollexclusive_available.h",
         "src/core/lib/iomgr/load_file.h",
         "src/core/lib/iomgr/lockfree_event.h",
diff --git a/build.yaml b/build.yaml
index 5dac770614..fb2f6d08be 100644
--- a/build.yaml
+++ b/build.yaml
@@ -214,6 +214,7 @@ filegroups:
   - src/core/lib/iomgr/iomgr.h
   - src/core/lib/iomgr/iomgr_internal.h
   - src/core/lib/iomgr/iomgr_posix.h
+  - src/core/lib/iomgr/iomgr_uv.h
   - src/core/lib/iomgr/is_epollexclusive_available.h
   - src/core/lib/iomgr/load_file.h
   - src/core/lib/iomgr/lockfree_event.h
@@ -2386,6 +2387,8 @@ targets:
   - grpc
   - gpr_test_util
   - gpr
+  exclude_iomgrs:
+  - uv
   platforms:
   - linux
   secure: true
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index 57b6f92d1e..90580c5fad 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -277,6 +277,7 @@ Pod::Spec.new do |s|
                       'src/core/lib/iomgr/iomgr.h',
                       'src/core/lib/iomgr/iomgr_internal.h',
                       'src/core/lib/iomgr/iomgr_posix.h',
+                      'src/core/lib/iomgr/iomgr_uv.h',
                       'src/core/lib/iomgr/is_epollexclusive_available.h',
                       'src/core/lib/iomgr/load_file.h',
                       'src/core/lib/iomgr/lockfree_event.h',
@@ -761,6 +762,7 @@ Pod::Spec.new do |s|
                               'src/core/lib/iomgr/iomgr.h',
                               'src/core/lib/iomgr/iomgr_internal.h',
                               'src/core/lib/iomgr/iomgr_posix.h',
+                              'src/core/lib/iomgr/iomgr_uv.h',
                               'src/core/lib/iomgr/is_epollexclusive_available.h',
                               'src/core/lib/iomgr/load_file.h',
                               'src/core/lib/iomgr/lockfree_event.h',
diff --git a/grpc.gemspec b/grpc.gemspec
index dedee020b7..a166839888 100755
--- a/grpc.gemspec
+++ b/grpc.gemspec
@@ -209,6 +209,7 @@ Gem::Specification.new do |s|
   s.files += %w( src/core/lib/iomgr/iomgr.h )
   s.files += %w( src/core/lib/iomgr/iomgr_internal.h )
   s.files += %w( src/core/lib/iomgr/iomgr_posix.h )
+  s.files += %w( src/core/lib/iomgr/iomgr_uv.h )
   s.files += %w( src/core/lib/iomgr/is_epollexclusive_available.h )
   s.files += %w( src/core/lib/iomgr/load_file.h )
   s.files += %w( src/core/lib/iomgr/lockfree_event.h )
diff --git a/package.xml b/package.xml
index 38f51424e6..b31514b99f 100644
--- a/package.xml
+++ b/package.xml
@@ -223,6 +223,7 @@
     <file baseinstalldir="/" name="src/core/lib/iomgr/iomgr.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/iomgr/iomgr_internal.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/iomgr/iomgr_posix.h" role="src" />
+    <file baseinstalldir="/" name="src/core/lib/iomgr/iomgr_uv.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/iomgr/is_epollexclusive_available.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/iomgr/load_file.h" role="src" />
     <file baseinstalldir="/" name="src/core/lib/iomgr/lockfree_event.h" role="src" />
diff --git a/src/core/lib/iomgr/iomgr_uv.c b/src/core/lib/iomgr/iomgr_uv.c
index 8b1245c640..df5d23af3b 100644
--- a/src/core/lib/iomgr/iomgr_uv.c
+++ b/src/core/lib/iomgr/iomgr_uv.c
@@ -21,12 +21,20 @@
 #ifdef GRPC_UV
 
 #include "src/core/lib/debug/trace.h"
+#include "src/core/lib/iomgr/executor.h"
+#include "src/core/lib/iomgr/iomgr_uv.h"
 #include "src/core/lib/iomgr/pollset_uv.h"
 #include "src/core/lib/iomgr/tcp_uv.h"
 
+gpr_thd_id g_init_thread;
+
 void grpc_iomgr_platform_init(void) {
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
   grpc_pollset_global_init();
   grpc_register_tracer(&grpc_tcp_trace);
+  grpc_executor_set_threading(&exec_ctx, false);
+  g_init_thread = gpr_thd_currentid();
+  grpc_exec_ctx_finish(&exec_ctx);
 }
 void grpc_iomgr_platform_flush(void) {}
 void grpc_iomgr_platform_shutdown(void) { grpc_pollset_global_shutdown(); }
diff --git a/src/core/lib/iomgr/iomgr_uv.h b/src/core/lib/iomgr/iomgr_uv.h
new file mode 100644
index 0000000000..3b4daaa73b
--- /dev/null
+++ b/src/core/lib/iomgr/iomgr_uv.h
@@ -0,0 +1,37 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_CORE_LIB_IOMGR_IOMGR_UV_H
+#define GRPC_CORE_LIB_IOMGR_IOMGR_UV_H
+
+#include "src/core/lib/iomgr/iomgr_internal.h"
+
+#include <grpc/support/thd.h>
+
+/* The thread ID of the thread on which grpc was initialized. Used to verify
+ * that all calls into libuv are made on that same thread */
+extern gpr_thd_id g_init_thread;
+
+#ifdef GRPC_UV_THREAD_CHECK
+#define GRPC_UV_ASSERT_SAME_THREAD() \
+  GPR_ASSERT(gpr_thd_currentid() == g_init_thread)
+#else
+#define GRPC_UV_ASSERT_SAME_THREAD()
+#endif /* GRPC_UV_THREAD_CHECK */
+
+#endif /* GRPC_CORE_LIB_IOMGR_IOMGR_UV_H */
diff --git a/src/core/lib/iomgr/pollset_uv.c b/src/core/lib/iomgr/pollset_uv.c
index 946f0c8c60..a79fe89d3e 100644
--- a/src/core/lib/iomgr/pollset_uv.c
+++ b/src/core/lib/iomgr/pollset_uv.c
@@ -28,6 +28,7 @@
 #include <grpc/support/log.h>
 #include <grpc/support/sync.h>
 
+#include "src/core/lib/iomgr/iomgr_uv.h"
 #include "src/core/lib/iomgr/pollset.h"
 #include "src/core/lib/iomgr/pollset_uv.h"
 
@@ -70,6 +71,7 @@ void grpc_pollset_global_init(void) {
 }
 
 void grpc_pollset_global_shutdown(void) {
+  GRPC_UV_ASSERT_SAME_THREAD();
   gpr_mu_destroy(&grpc_polling_mu);
   uv_close((uv_handle_t *)dummy_uv_handle, dummy_handle_close_cb);
 }
@@ -79,6 +81,7 @@ static void timer_run_cb(uv_timer_t *timer) {}
 static void timer_close_cb(uv_handle_t *handle) { handle->data = (void *)1; }
 
 void grpc_pollset_init(grpc_pollset *pollset, gpr_mu **mu) {
+  GRPC_UV_ASSERT_SAME_THREAD();
   *mu = &grpc_polling_mu;
   uv_timer_init(uv_default_loop(), &pollset->timer);
   pollset->shutting_down = 0;
@@ -87,6 +90,7 @@ void grpc_pollset_init(grpc_pollset *pollset, gpr_mu **mu) {
 void grpc_pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
                            grpc_closure *closure) {
   GPR_ASSERT(!pollset->shutting_down);
+  GRPC_UV_ASSERT_SAME_THREAD();
   pollset->shutting_down = 1;
   if (grpc_pollset_work_run_loop) {
     // Drain any pending UV callbacks without blocking
@@ -99,6 +103,7 @@ void grpc_pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
 }
 
 void grpc_pollset_destroy(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset) {
+  GRPC_UV_ASSERT_SAME_THREAD();
   uv_close((uv_handle_t *)&pollset->timer, timer_close_cb);
   // timer.data is a boolean indicating that the timer has finished closing
   pollset->timer.data = (void *)0;
@@ -113,6 +118,7 @@ grpc_error *grpc_pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
                               grpc_pollset_worker **worker_hdl,
                               gpr_timespec now, gpr_timespec deadline) {
   uint64_t timeout;
+  GRPC_UV_ASSERT_SAME_THREAD();
   gpr_mu_unlock(&grpc_polling_mu);
   if (grpc_pollset_work_run_loop) {
     if (gpr_time_cmp(deadline, now) >= 0) {
@@ -141,6 +147,7 @@ grpc_error *grpc_pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
 
 grpc_error *grpc_pollset_kick(grpc_pollset *pollset,
                               grpc_pollset_worker *specific_worker) {
+  GRPC_UV_ASSERT_SAME_THREAD();
   uv_timer_start(dummy_uv_handle, dummy_timer_cb, 0, 0);
   return GRPC_ERROR_NONE;
 }
diff --git a/src/core/lib/iomgr/resolve_address_uv.c b/src/core/lib/iomgr/resolve_address_uv.c
index a98b8e62db..2d438e8b48 100644
--- a/src/core/lib/iomgr/resolve_address_uv.c
+++ b/src/core/lib/iomgr/resolve_address_uv.c
@@ -30,6 +30,7 @@
 #include "src/core/lib/iomgr/closure.h"
 #include "src/core/lib/iomgr/error.h"
 #include "src/core/lib/iomgr/exec_ctx.h"
+#include "src/core/lib/iomgr/iomgr_uv.h"
 #include "src/core/lib/iomgr/resolve_address.h"
 #include "src/core/lib/iomgr/sockaddr.h"
 #include "src/core/lib/iomgr/sockaddr_utils.h"
@@ -114,11 +115,14 @@ static void getaddrinfo_callback(uv_getaddrinfo_t *req, int status,
   grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
   grpc_error *error;
   int retry_status;
+  char *port = r->port;
 
   gpr_free(req);
   retry_status = retry_named_port_failure(status, r, getaddrinfo_callback);
   if (retry_status == 0) {
-    // The request is being retried. Nothing should be done here
+    /* The request is being retried. It is using its own port string, so we free
+     * the original one */
+    gpr_free(port);
     return;
   }
   /* Either no retry was attempted, or the retry failed. Either way, the
@@ -171,6 +175,8 @@ static grpc_error *blocking_resolve_address_impl(
   grpc_error *err;
   int retry_status;
 
+  GRPC_UV_ASSERT_SAME_THREAD();
+
   req.addrinfo = NULL;
 
   err = try_split_host_port(name, default_port, &host, &port);
@@ -218,16 +224,19 @@ static void resolve_address_impl(grpc_exec_ctx *exec_ctx, const char *name,
                                  grpc_pollset_set *interested_parties,
                                  grpc_closure *on_done,
                                  grpc_resolved_addresses **addrs) {
-  uv_getaddrinfo_t *req;
-  request *r;
-  struct addrinfo *hints;
-  char *host;
-  char *port;
+  uv_getaddrinfo_t *req = NULL;
+  request *r = NULL;
+  struct addrinfo *hints = NULL;
+  char *host = NULL;
+  char *port = NULL;
   grpc_error *err;
   int s;
+  GRPC_UV_ASSERT_SAME_THREAD();
   err = try_split_host_port(name, default_port, &host, &port);
   if (err != GRPC_ERROR_NONE) {
     GRPC_CLOSURE_SCHED(exec_ctx, on_done, err);
+    gpr_free(host);
+    gpr_free(port);
     return;
   }
   r = gpr_malloc(sizeof(request));
diff --git a/src/core/lib/iomgr/tcp_client_uv.c b/src/core/lib/iomgr/tcp_client_uv.c
index 2f1d237c07..786c456b73 100644
--- a/src/core/lib/iomgr/tcp_client_uv.c
+++ b/src/core/lib/iomgr/tcp_client_uv.c
@@ -26,6 +26,7 @@
 #include <grpc/support/log.h>
 
 #include "src/core/lib/iomgr/error.h"
+#include "src/core/lib/iomgr/iomgr_uv.h"
 #include "src/core/lib/iomgr/sockaddr_utils.h"
 #include "src/core/lib/iomgr/tcp_client.h"
 #include "src/core/lib/iomgr/tcp_uv.h"
@@ -124,6 +125,8 @@ static void tcp_client_connect_impl(grpc_exec_ctx *exec_ctx,
   (void)channel_args;
   (void)interested_parties;
 
+  GRPC_UV_ASSERT_SAME_THREAD();
+
   if (channel_args != NULL) {
     for (size_t i = 0; i < channel_args->num_args; i++) {
       if (0 == strcmp(channel_args->args[i].key, GRPC_ARG_RESOURCE_QUOTA)) {
diff --git a/src/core/lib/iomgr/tcp_server_uv.c b/src/core/lib/iomgr/tcp_server_uv.c
index 079c913579..3b9332321f 100644
--- a/src/core/lib/iomgr/tcp_server_uv.c
+++ b/src/core/lib/iomgr/tcp_server_uv.c
@@ -20,6 +20,7 @@
 
 #ifdef GRPC_UV
 
+#include <assert.h>
 #include <string.h>
 
 #include <grpc/support/alloc.h>
@@ -27,6 +28,7 @@
 
 #include "src/core/lib/iomgr/error.h"
 #include "src/core/lib/iomgr/exec_ctx.h"
+#include "src/core/lib/iomgr/iomgr_uv.h"
 #include "src/core/lib/iomgr/sockaddr.h"
 #include "src/core/lib/iomgr/sockaddr_utils.h"
 #include "src/core/lib/iomgr/tcp_server.h"
@@ -43,6 +45,8 @@ struct grpc_tcp_listener {
   struct grpc_tcp_listener *next;
 
   bool closed;
+
+  bool has_pending_connection;
 };
 
 struct grpc_tcp_server {
@@ -104,6 +108,7 @@ grpc_error *grpc_tcp_server_create(grpc_exec_ctx *exec_ctx,
 }
 
 grpc_tcp_server *grpc_tcp_server_ref(grpc_tcp_server *s) {
+  GRPC_UV_ASSERT_SAME_THREAD();
   gpr_ref(&s->refs);
   return s;
 }
@@ -168,6 +173,7 @@ static void tcp_server_destroy(grpc_exec_ctx *exec_ctx, grpc_tcp_server *s) {
 }
 
 void grpc_tcp_server_unref(grpc_exec_ctx *exec_ctx, grpc_tcp_server *s) {
+  GRPC_UV_ASSERT_SAME_THREAD();
   if (gpr_unref(&s->refs)) {
     /* Complete shutdown_starting work before destroying. */
     grpc_exec_ctx local_exec_ctx = GRPC_EXEC_CTX_INIT;
@@ -183,18 +189,49 @@ void grpc_tcp_server_unref(grpc_exec_ctx *exec_ctx, grpc_tcp_server *s) {
   }
 }
 
-static void accepted_connection_close_cb(uv_handle_t *handle) {
-  gpr_free(handle);
-}
-
-static void on_connect(uv_stream_t *server, int status) {
-  grpc_tcp_listener *sp = (grpc_tcp_listener *)server->data;
+static void finish_accept(grpc_exec_ctx *exec_ctx, grpc_tcp_listener *sp) {
+  grpc_tcp_server_acceptor *acceptor = gpr_malloc(sizeof(*acceptor));
   uv_tcp_t *client;
   grpc_endpoint *ep = NULL;
-  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
   grpc_resolved_address peer_name;
   char *peer_name_string;
   int err;
+  uv_tcp_t *server = sp->handle;
+
+  client = gpr_malloc(sizeof(uv_tcp_t));
+  uv_tcp_init(uv_default_loop(), client);
+  // UV documentation says this is guaranteed to succeed
+  uv_accept((uv_stream_t *)server, (uv_stream_t *)client);
+  peer_name_string = NULL;
+  memset(&peer_name, 0, sizeof(grpc_resolved_address));
+  peer_name.len = sizeof(struct sockaddr_storage);
+  err = uv_tcp_getpeername(client, (struct sockaddr *)&peer_name.addr,
+                           (int *)&peer_name.len);
+  if (err == 0) {
+    peer_name_string = grpc_sockaddr_to_uri(&peer_name);
+  } else {
+    gpr_log(GPR_INFO, "uv_tcp_getpeername error: %s", uv_strerror(err));
+  }
+  if (GRPC_TRACER_ON(grpc_tcp_trace)) {
+    if (peer_name_string) {
+      gpr_log(GPR_DEBUG, "SERVER_CONNECT: %p accepted connection: %s",
+              sp->server, peer_name_string);
+    } else {
+      gpr_log(GPR_DEBUG, "SERVER_CONNECT: %p accepted connection", sp->server);
+    }
+  }
+  ep = grpc_tcp_create(client, sp->server->resource_quota, peer_name_string);
+  acceptor->from_server = sp->server;
+  acceptor->port_index = sp->port_index;
+  acceptor->fd_index = 0;
+  sp->server->on_accept_cb(exec_ctx, sp->server->on_accept_cb_arg, ep, NULL,
+                           acceptor);
+  gpr_free(peer_name_string);
+}
+
+static void on_connect(uv_stream_t *server, int status) {
+  grpc_tcp_listener *sp = (grpc_tcp_listener *)server->data;
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
 
   if (status < 0) {
     switch (status) {
@@ -207,35 +244,19 @@ static void on_connect(uv_stream_t *server, int status) {
     }
   }
 
-  client = gpr_malloc(sizeof(uv_tcp_t));
-  uv_tcp_init(uv_default_loop(), client);
-  // UV documentation says this is guaranteed to succeed
-  uv_accept((uv_stream_t *)server, (uv_stream_t *)client);
-  // If the server has not been started, we discard incoming connections
-  if (sp->server->on_accept_cb == NULL) {
-    uv_close((uv_handle_t *)client, accepted_connection_close_cb);
+  GPR_ASSERT(!sp->has_pending_connection);
+
+  if (GRPC_TRACER_ON(grpc_tcp_trace)) {
+    gpr_log(GPR_DEBUG, "SERVER_CONNECT: %p incoming connection", sp->server);
+  }
+
+  // Create acceptor.
+  if (sp->server->on_accept_cb) {
+    finish_accept(&exec_ctx, sp);
   } else {
-    peer_name_string = NULL;
-    memset(&peer_name, 0, sizeof(grpc_resolved_address));
-    peer_name.len = sizeof(struct sockaddr_storage);
-    err = uv_tcp_getpeername(client, (struct sockaddr *)&peer_name.addr,
-                             (int *)&peer_name.len);
-    if (err == 0) {
-      peer_name_string = grpc_sockaddr_to_uri(&peer_name);
-    } else {
-      gpr_log(GPR_INFO, "uv_tcp_getpeername error: %s", uv_strerror(status));
-    }
-    ep = grpc_tcp_create(client, sp->server->resource_quota, peer_name_string);
-    // Create acceptor.
-    grpc_tcp_server_acceptor *acceptor = gpr_malloc(sizeof(*acceptor));
-    acceptor->from_server = sp->server;
-    acceptor->port_index = sp->port_index;
-    acceptor->fd_index = 0;
-    sp->server->on_accept_cb(&exec_ctx, sp->server->on_accept_cb_arg, ep, NULL,
-                             acceptor);
-    grpc_exec_ctx_finish(&exec_ctx);
-    gpr_free(peer_name_string);
+    sp->has_pending_connection = true;
   }
+  grpc_exec_ctx_finish(&exec_ctx);
 }
 
 static grpc_error *add_socket_to_server(grpc_tcp_server *s, uv_tcp_t *handle,
@@ -282,7 +303,7 @@ static grpc_error *add_socket_to_server(grpc_tcp_server *s, uv_tcp_t *handle,
 
   GPR_ASSERT(port >= 0);
   GPR_ASSERT(!s->on_accept_cb && "must add ports before starting server");
-  sp = gpr_malloc(sizeof(grpc_tcp_listener));
+  sp = gpr_zalloc(sizeof(grpc_tcp_listener));
   sp->next = NULL;
   if (s->head == NULL) {
     s->head = sp;
@@ -318,6 +339,8 @@ grpc_error *grpc_tcp_server_add_port(grpc_tcp_server *s,
   grpc_error *error = GRPC_ERROR_NONE;
   int family;
 
+  GRPC_UV_ASSERT_SAME_THREAD();
+
   if (s->tail != NULL) {
     port_index = s->tail->port_index + 1;
   }
@@ -378,6 +401,18 @@ grpc_error *grpc_tcp_server_add_port(grpc_tcp_server *s,
 
   gpr_free(allocated_addr);
 
+  if (GRPC_TRACER_ON(grpc_tcp_trace)) {
+    char *port_string;
+    grpc_sockaddr_to_string(&port_string, addr, 0);
+    const char *str = grpc_error_string(error);
+    if (port_string) {
+      gpr_log(GPR_DEBUG, "SERVER %p add_port %s error=%s", s, port_string, str);
+      gpr_free(port_string);
+    } else {
+      gpr_log(GPR_DEBUG, "SERVER %p add_port error=%s", s, str);
+    }
+  }
+
   if (error != GRPC_ERROR_NONE) {
     grpc_error *error_out = GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING(
         "Failed to add port to server", &error, 1);
@@ -397,13 +432,19 @@ void grpc_tcp_server_start(grpc_exec_ctx *exec_ctx, grpc_tcp_server *server,
   grpc_tcp_listener *sp;
   (void)pollsets;
   (void)pollset_count;
+  GRPC_UV_ASSERT_SAME_THREAD();
+  if (GRPC_TRACER_ON(grpc_tcp_trace)) {
+    gpr_log(GPR_DEBUG, "SERVER_START %p", server);
+  }
   GPR_ASSERT(on_accept_cb);
   GPR_ASSERT(!server->on_accept_cb);
   server->on_accept_cb = on_accept_cb;
   server->on_accept_cb_arg = cb_arg;
   for (sp = server->head; sp; sp = sp->next) {
-    GPR_ASSERT(uv_listen((uv_stream_t *)sp->handle, SOMAXCONN, on_connect) ==
-               0);
+    if (sp->has_pending_connection) {
+      finish_accept(exec_ctx, sp);
+      sp->has_pending_connection = false;
+    }
   }
 }
 
diff --git a/src/core/lib/iomgr/tcp_uv.c b/src/core/lib/iomgr/tcp_uv.c
index 7c6a9b85f5..a05c19b4ac 100644
--- a/src/core/lib/iomgr/tcp_uv.c
+++ b/src/core/lib/iomgr/tcp_uv.c
@@ -30,6 +30,7 @@
 #include <grpc/support/string_util.h>
 
 #include "src/core/lib/iomgr/error.h"
+#include "src/core/lib/iomgr/iomgr_uv.h"
 #include "src/core/lib/iomgr/network_status_tracker.h"
 #include "src/core/lib/iomgr/resource_quota.h"
 #include "src/core/lib/iomgr/tcp_uv.h"
@@ -183,6 +184,7 @@ static void uv_endpoint_read(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep,
   grpc_tcp *tcp = (grpc_tcp *)ep;
   int status;
   grpc_error *error = GRPC_ERROR_NONE;
+  GRPC_UV_ASSERT_SAME_THREAD();
   GPR_ASSERT(tcp->read_cb == NULL);
   tcp->read_cb = cb;
   tcp->read_slices = read_slices;
@@ -236,6 +238,7 @@ static void uv_endpoint_write(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep,
   unsigned int i;
   grpc_slice *slice;
   uv_write_t *write_req;
+  GRPC_UV_ASSERT_SAME_THREAD();
 
   if (GRPC_TRACER_ON(grpc_tcp_trace)) {
     size_t j;
@@ -307,6 +310,10 @@ static void uv_endpoint_shutdown(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep,
                                  grpc_error *why) {
   grpc_tcp *tcp = (grpc_tcp *)ep;
   if (!tcp->shutting_down) {
+    if (GRPC_TRACER_ON(grpc_tcp_trace)) {
+      const char *str = grpc_error_string(why);
+      gpr_log(GPR_DEBUG, "TCP %p shutdown why=%s", tcp->handle, str);
+    }
     tcp->shutting_down = true;
     uv_shutdown_t *req = &tcp->shutdown_req;
     uv_shutdown(req, (uv_stream_t *)tcp->handle, shutdown_callback);
diff --git a/src/core/lib/iomgr/timer_uv.c b/src/core/lib/iomgr/timer_uv.c
index 1ab82ef1d5..70f49bcbe8 100644
--- a/src/core/lib/iomgr/timer_uv.c
+++ b/src/core/lib/iomgr/timer_uv.c
@@ -24,6 +24,7 @@
 #include <grpc/support/log.h>
 
 #include "src/core/lib/debug/trace.h"
+#include "src/core/lib/iomgr/iomgr_uv.h"
 #include "src/core/lib/iomgr/timer.h"
 
 #include <uv.h>
@@ -43,6 +44,7 @@ static void stop_uv_timer(uv_timer_t *handle) {
 void run_expired_timer(uv_timer_t *handle) {
   grpc_timer *timer = (grpc_timer *)handle->data;
   grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  GRPC_UV_ASSERT_SAME_THREAD();
   GPR_ASSERT(timer->pending);
   timer->pending = 0;
   GRPC_CLOSURE_SCHED(&exec_ctx, timer->closure, GRPC_ERROR_NONE);
@@ -55,6 +57,7 @@ void grpc_timer_init(grpc_exec_ctx *exec_ctx, grpc_timer *timer,
                      gpr_timespec now) {
   uint64_t timeout;
   uv_timer_t *uv_timer;
+  GRPC_UV_ASSERT_SAME_THREAD();
   timer->closure = closure;
   if (gpr_time_cmp(deadline, now) <= 0) {
     timer->pending = 0;
@@ -75,6 +78,7 @@ void grpc_timer_init(grpc_exec_ctx *exec_ctx, grpc_timer *timer,
 }
 
 void grpc_timer_cancel(grpc_exec_ctx *exec_ctx, grpc_timer *timer) {
+  GRPC_UV_ASSERT_SAME_THREAD();
   if (timer->pending) {
     timer->pending = 0;
     GRPC_CLOSURE_SCHED(exec_ctx, timer->closure, GRPC_ERROR_CANCELLED);
diff --git a/tools/doxygen/Doxyfile.core.internal b/tools/doxygen/Doxyfile.core.internal
index 4ad8a0ddb4..b747da3a67 100644
--- a/tools/doxygen/Doxyfile.core.internal
+++ b/tools/doxygen/Doxyfile.core.internal
@@ -1123,6 +1123,7 @@ src/core/lib/iomgr/iomgr_internal.h \
 src/core/lib/iomgr/iomgr_posix.c \
 src/core/lib/iomgr/iomgr_posix.h \
 src/core/lib/iomgr/iomgr_uv.c \
+src/core/lib/iomgr/iomgr_uv.h \
 src/core/lib/iomgr/iomgr_windows.c \
 src/core/lib/iomgr/is_epollexclusive_available.c \
 src/core/lib/iomgr/is_epollexclusive_available.h \
diff --git a/tools/run_tests/generated/sources_and_headers.json b/tools/run_tests/generated/sources_and_headers.json
index 8993e9340a..66b26dab2b 100644
--- a/tools/run_tests/generated/sources_and_headers.json
+++ b/tools/run_tests/generated/sources_and_headers.json
@@ -7738,6 +7738,7 @@
       "src/core/lib/iomgr/iomgr.h", 
       "src/core/lib/iomgr/iomgr_internal.h", 
       "src/core/lib/iomgr/iomgr_posix.h", 
+      "src/core/lib/iomgr/iomgr_uv.h", 
       "src/core/lib/iomgr/is_epollexclusive_available.h", 
       "src/core/lib/iomgr/load_file.h", 
       "src/core/lib/iomgr/lockfree_event.h", 
@@ -7898,6 +7899,7 @@
       "src/core/lib/iomgr/iomgr_posix.c", 
       "src/core/lib/iomgr/iomgr_posix.h", 
       "src/core/lib/iomgr/iomgr_uv.c", 
+      "src/core/lib/iomgr/iomgr_uv.h", 
       "src/core/lib/iomgr/iomgr_windows.c", 
       "src/core/lib/iomgr/is_epollexclusive_available.c", 
       "src/core/lib/iomgr/is_epollexclusive_available.h", 
diff --git a/tools/run_tests/generated/tests.json b/tools/run_tests/generated/tests.json
index 7ce8b3b9d1..c2ebaa6614 100644
--- a/tools/run_tests/generated/tests.json
+++ b/tools/run_tests/generated/tests.json
@@ -1390,7 +1390,9 @@
     ], 
     "cpu_cost": 1.0, 
     "exclude_configs": [], 
-    "exclude_iomgrs": [], 
+    "exclude_iomgrs": [
+      "uv"
+    ], 
     "flaky": false, 
     "gtest": false, 
     "language": "c", 
diff --git a/tools/run_tests/run_tests.py b/tools/run_tests/run_tests.py
index 611868ce5a..50eed6256c 100755
--- a/tools/run_tests/run_tests.py
+++ b/tools/run_tests/run_tests.py
@@ -245,7 +245,7 @@ class CLanguage(object):
       self._docker_distro, self._make_options = self._compiler_options(self.args.use_docker,
                                                                        self.args.compiler)
     if args.iomgr_platform == "uv":
-      cflags = '-DGRPC_UV '
+      cflags = '-DGRPC_UV -DGRPC_UV_THREAD_CHECK'
       try:
         cflags += subprocess.check_output(['pkg-config', '--cflags', 'libuv']).strip() + ' '
       except (subprocess.CalledProcessError, OSError):
diff --git a/vsprojects/vcxproj/grpc/grpc.vcxproj b/vsprojects/vcxproj/grpc/grpc.vcxproj
index 41fe1b222b..57c0ac7bc4 100644
--- a/vsprojects/vcxproj/grpc/grpc.vcxproj
+++ b/vsprojects/vcxproj/grpc/grpc.vcxproj
@@ -334,6 +334,7 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_internal.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_posix.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_uv.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\is_epollexclusive_available.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\load_file.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\lockfree_event.h" />
diff --git a/vsprojects/vcxproj/grpc/grpc.vcxproj.filters b/vsprojects/vcxproj/grpc/grpc.vcxproj.filters
index 00b8705826..e9bb52defa 100644
--- a/vsprojects/vcxproj/grpc/grpc.vcxproj.filters
+++ b/vsprojects/vcxproj/grpc/grpc.vcxproj.filters
@@ -959,6 +959,9 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_posix.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_uv.h">
+      <Filter>src\core\lib\iomgr</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\is_epollexclusive_available.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
diff --git a/vsprojects/vcxproj/grpc_test_util/grpc_test_util.vcxproj b/vsprojects/vcxproj/grpc_test_util/grpc_test_util.vcxproj
index 32809ca589..64bf54e557 100644
--- a/vsprojects/vcxproj/grpc_test_util/grpc_test_util.vcxproj
+++ b/vsprojects/vcxproj/grpc_test_util/grpc_test_util.vcxproj
@@ -229,6 +229,7 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_internal.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_posix.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_uv.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\is_epollexclusive_available.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\load_file.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\lockfree_event.h" />
diff --git a/vsprojects/vcxproj/grpc_test_util/grpc_test_util.vcxproj.filters b/vsprojects/vcxproj/grpc_test_util/grpc_test_util.vcxproj.filters
index def8de4202..35fd87a4c5 100644
--- a/vsprojects/vcxproj/grpc_test_util/grpc_test_util.vcxproj.filters
+++ b/vsprojects/vcxproj/grpc_test_util/grpc_test_util.vcxproj.filters
@@ -683,6 +683,9 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_posix.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_uv.h">
+      <Filter>src\core\lib\iomgr</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\is_epollexclusive_available.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
diff --git a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj
index ac98dc0540..4ed59780a4 100644
--- a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj
+++ b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj
@@ -324,6 +324,7 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_internal.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_posix.h" />
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_uv.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\is_epollexclusive_available.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\load_file.h" />
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\lockfree_event.h" />
diff --git a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
index fea68c51dc..2c3319beae 100644
--- a/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
+++ b/vsprojects/vcxproj/grpc_unsecure/grpc_unsecure.vcxproj.filters
@@ -866,6 +866,9 @@
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_posix.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\iomgr_uv.h">
+      <Filter>src\core\lib\iomgr</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\core\lib\iomgr\is_epollexclusive_available.h">
       <Filter>src\core\lib\iomgr</Filter>
     </ClInclude>