Merge master

23 files changed, 404 insertions, 248 deletions

diff --git a/build.yaml b/build.yaml
index 4f43125a24..cd6486ea29 100644
--- a/build.yaml
+++ b/build.yaml
@@ -3475,8 +3475,6 @@ targets:
   - grpc_unsecure
   - gpr_test_util
   - gpr
-  args:
-  - --benchmark_min_time=0
   benchmark: true
   defaults: benchmark
   platforms:
@@ -3498,8 +3496,6 @@ targets:
   - grpc_unsecure
   - gpr_test_util
   - gpr
-  args:
-  - --benchmark_min_time=0
   benchmark: true
   defaults: benchmark
   platforms:
@@ -3521,8 +3517,6 @@ targets:
   - grpc_unsecure
   - gpr_test_util
   - gpr
-  args:
-  - --benchmark_min_time=0
   benchmark: true
   defaults: benchmark
   platforms:
@@ -3544,8 +3538,6 @@ targets:
   - grpc_unsecure
   - gpr_test_util
   - gpr
-  args:
-  - --benchmark_min_time=0
   benchmark: true
   defaults: benchmark
   platforms:
@@ -3566,8 +3558,6 @@ targets:
   - grpc_unsecure
   - gpr_test_util
   - gpr
-  args:
-  - --benchmark_min_time=0
   benchmark: true
   defaults: benchmark
   platforms:
@@ -3588,8 +3578,6 @@ targets:
   - grpc_unsecure
   - gpr_test_util
   - gpr
-  args:
-  - --benchmark_min_time=0
   benchmark: true
   defaults: benchmark
   platforms:
@@ -3610,8 +3598,6 @@ targets:
   - grpc_unsecure
   - gpr_test_util
   - gpr
-  args:
-  - --benchmark_min_time=4
   benchmark: true
   defaults: benchmark
   platforms:
@@ -3632,8 +3618,6 @@ targets:
   - grpc_unsecure
   - gpr_test_util
   - gpr
-  args:
-  - --benchmark_min_time=0
   benchmark: true
   defaults: benchmark
   platforms:
@@ -3657,8 +3641,6 @@ targets:
   - grpc_unsecure
   - gpr_test_util
   - gpr
-  args:
-  - --benchmark_min_time=0
   benchmark: true
   defaults: benchmark
   excluded_poll_engines:
@@ -3685,8 +3667,6 @@ targets:
   - grpc_unsecure
   - gpr_test_util
   - gpr
-  args:
-  - --benchmark_min_time=0
   benchmark: true
   defaults: benchmark
   excluded_poll_engines:
@@ -3712,8 +3692,6 @@ targets:
   - gpr_test_util
   - gpr
   - grpc++_test_config
-  args:
-  - --benchmark_min_time=0
   benchmark: true
   defaults: benchmark
   exclude_configs:
@@ -3742,8 +3720,6 @@ targets:
   - grpc_unsecure
   - gpr_test_util
   - gpr
-  args:
-  - --benchmark_min_time=0
   benchmark: true
   defaults: benchmark
   excluded_poll_engines:
@@ -3768,8 +3744,6 @@ targets:
   - grpc_unsecure
   - gpr_test_util
   - gpr
-  args:
-  - --benchmark_min_time=0
   benchmark: true
   defaults: benchmark
   platforms:
@@ -3791,8 +3765,6 @@ targets:
   - grpc_unsecure
   - gpr_test_util
   - gpr
-  args:
-  - --benchmark_min_time=0
   benchmark: true
   defaults: benchmark
   platforms:
diff --git a/doc/connectivity-semantics-and-api.md b/doc/connectivity-semantics-and-api.md
index 6d39619d65..dc30fe5348 100644
--- a/doc/connectivity-semantics-and-api.md
+++ b/doc/connectivity-semantics-and-api.md
@@ -115,8 +115,14 @@ Channel State API
 -----------------
 
 All gRPC libraries will expose a channel-level API method to poll the current
-state of a channel. In C++, this method is called GetCurrentState and returns
-an enum for one of the five legal states.
+state of a channel. In C++, this method is called GetState and returns an enum
+for one of the five legal states. It also accepts a boolean `try_to_connect` to
+transition to CONNECTING if the channel is currently IDLE. The boolean should
+act as if an RPC occurred, so it should also reset IDLE_TIMEOUT.
+
+```cpp
+grpc_connectivity_state GetState(bool try_to_connect);
+```
 
 All libraries should also expose an API that enables the application (user of
 the gRPC API) to be notified when the channel state changes. Since state
@@ -127,11 +133,11 @@ the user to poll the channel for the current state.
 The synchronous version of this API is:
 
 ```cpp
-bool WaitForStateChange(gpr_timespec deadline, ChannelState source_state);
+bool WaitForStateChange(grpc_connectivity_state source_state, gpr_timespec deadline);
 ```
 
-which returns true when the state changes to something other than the
-source_state and false if the deadline expires. Asynchronous and futures based
+which returns `true` when the state is something other than the
+`source_state` and `false` if the deadline expires. Asynchronous- and futures-based
 APIs should have a corresponding method that allows the application to be
 notified when the state of a channel changes.
 
diff --git a/src/core/ext/filters/client_channel/backup_poller.cc b/src/core/ext/filters/client_channel/backup_poller.cc
index 7e121c8f31..1b42f5d6a0 100644
--- a/src/core/ext/filters/client_channel/backup_poller.cc
+++ b/src/core/ext/filters/client_channel/backup_poller.cc
@@ -140,9 +140,16 @@ void grpc_client_channel_start_backup_polling(
                     grpc_exec_ctx_now() + g_poll_interval_ms,
                     &g_poller->run_poller_closure);
   }
+
   gpr_ref(&g_poller->refs);
+  /* Get a reference to g_poller->pollset before releasing g_poller_mu to make
+   * TSAN happy. Otherwise, reading from g_poller (i.e g_poller->pollset) after
+   * releasing the lock and setting g_poller to NULL in g_poller_unref() is
+   * being flagged as a data-race by TSAN */
+  grpc_pollset* pollset = g_poller->pollset;
   gpr_mu_unlock(&g_poller_mu);
-  grpc_pollset_set_add_pollset(interested_parties, g_poller->pollset);
+
+  grpc_pollset_set_add_pollset(interested_parties, pollset);
 }
 
 void grpc_client_channel_stop_backup_polling(
diff --git a/src/core/ext/filters/client_channel/uri_parser.cc b/src/core/ext/filters/client_channel/uri_parser.cc
index 5a6a532e7e..4df724af89 100644
--- a/src/core/ext/filters/client_channel/uri_parser.cc
+++ b/src/core/ext/filters/client_channel/uri_parser.cc
@@ -59,7 +59,9 @@ static grpc_uri* bad_uri(const char* uri_text, size_t pos, const char* section,
 static char* decode_and_copy_component(const char* src, size_t begin,
                                        size_t end) {
   grpc_slice component =
-      grpc_slice_from_copied_buffer(src + begin, end - begin);
+      (begin == NOT_SET || end == NOT_SET)
+          ? grpc_empty_slice()
+          : grpc_slice_from_copied_buffer(src + begin, end - begin);
   grpc_slice decoded_component =
       grpc_permissive_percent_decode_slice(component);
   char* out = grpc_dump_slice(decoded_component, GPR_DUMP_ASCII);
diff --git a/src/core/ext/transport/chttp2/transport/chttp2_transport.cc b/src/core/ext/transport/chttp2/transport/chttp2_transport.cc
index fcfc03630f..ecf3cf69ef 100644
--- a/src/core/ext/transport/chttp2/transport/chttp2_transport.cc
+++ b/src/core/ext/transport/chttp2/transport/chttp2_transport.cc
@@ -177,6 +177,8 @@ static void destruct_transport(grpc_chttp2_transport* t) {
     GPR_ASSERT(t->lists[i].tail == NULL);
   }
 
+  GRPC_ERROR_UNREF(t->goaway_error);
+
   GPR_ASSERT(grpc_chttp2_stream_map_size(&t->stream_map) == 0);
 
   grpc_chttp2_stream_map_destroy(&t->stream_map);
@@ -289,6 +291,7 @@ static void init_transport(grpc_chttp2_transport* t,
                     keepalive_watchdog_fired_locked, t,
                     grpc_combiner_scheduler(t->combiner));
 
+  t->goaway_error = GRPC_ERROR_NONE;
   grpc_chttp2_goaway_parser_init(&t->goaway_parser);
   grpc_chttp2_hpack_parser_init(&t->hpack_parser);
 
@@ -1059,7 +1062,16 @@ void grpc_chttp2_add_incoming_goaway(grpc_chttp2_transport* t,
                                      grpc_slice goaway_text) {
   // GRPC_CHTTP2_IF_TRACING(
   //     gpr_log(GPR_DEBUG, "got goaway [%d]: %s", goaway_error, msg));
-  t->seen_goaway = 1;
+
+  // Discard the error from a previous goaway frame (if any)
+  if (t->goaway_error != GRPC_ERROR_NONE) {
+    GRPC_ERROR_UNREF(t->goaway_error);
+  }
+  t->goaway_error = grpc_error_set_str(
+      grpc_error_set_int(
+          GRPC_ERROR_CREATE_FROM_STATIC_STRING("GOAWAY received"),
+          GRPC_ERROR_INT_HTTP2_ERROR, (intptr_t)goaway_error),
+      GRPC_ERROR_STR_RAW_BYTES, goaway_text);
 
   /* When a client receives a GOAWAY with error code ENHANCE_YOUR_CALM and debug
    * data equal to "too_many_pings", it should log the occurrence at a log level
@@ -1080,14 +1092,8 @@ void grpc_chttp2_add_incoming_goaway(grpc_chttp2_transport* t,
 
   /* lie: use transient failure from the transport to indicate goaway has been
    * received */
-  connectivity_state_set(
-      t, GRPC_CHANNEL_TRANSIENT_FAILURE,
-      grpc_error_set_str(
-          grpc_error_set_int(
-              GRPC_ERROR_CREATE_FROM_STATIC_STRING("GOAWAY received"),
-              GRPC_ERROR_INT_HTTP2_ERROR, (intptr_t)goaway_error),
-          GRPC_ERROR_STR_RAW_BYTES, goaway_text),
-      "got_goaway");
+  connectivity_state_set(t, GRPC_CHANNEL_TRANSIENT_FAILURE,
+                         GRPC_ERROR_REF(t->goaway_error), "got_goaway");
 }
 
 static void maybe_start_some_streams(grpc_chttp2_transport* t) {
@@ -1976,7 +1982,6 @@ void grpc_chttp2_fake_status(grpc_chttp2_transport* t, grpc_chttp2_stream* s,
   grpc_status_code status;
   grpc_slice slice;
   grpc_error_get_status(error, s->deadline, &status, &slice, NULL);
-
   if (status != GRPC_STATUS_OK) {
     s->seen_error = true;
   }
@@ -2427,6 +2432,12 @@ static void read_action_locked(void* tp, grpc_error* error) {
         "Transport closed", &t->closed_with_error, 1);
   }
   if (error != GRPC_ERROR_NONE) {
+    /* If a goaway frame was received, this might be the reason why the read
+     * failed. Add this info to the error */
+    if (t->goaway_error != GRPC_ERROR_NONE) {
+      error = grpc_error_add_child(error, GRPC_ERROR_REF(t->goaway_error));
+    }
+
     close_transport_locked(t, GRPC_ERROR_REF(error));
     t->endpoint_reading = 0;
   } else if (t->closed_with_error == GRPC_ERROR_NONE) {
diff --git a/src/core/ext/transport/chttp2/transport/internal.h b/src/core/ext/transport/chttp2/transport/internal.h
index aac04728eb..3f27da6d0a 100644
--- a/src/core/ext/transport/chttp2/transport/internal.h
+++ b/src/core/ext/transport/chttp2/transport/internal.h
@@ -306,9 +306,10 @@ struct grpc_chttp2_transport {
    */
   uint32_t write_buffer_size;
 
-  /** have we seen a goaway */
-  bool seen_goaway;
-  /** have we sent a goaway */
+  /** Set to a grpc_error object if a goaway frame is received. By default, set
+   * to GRPC_ERROR_NONE */
+  grpc_error* goaway_error;
+
   grpc_chttp2_sent_goaway_state sent_goaway_state;
 
   /** are the local settings dirty and need to be sent? */
@@ -375,11 +376,6 @@ struct grpc_chttp2_transport {
   grpc_error* (*parser)(void* parser_user_data, grpc_chttp2_transport* t,
                         grpc_chttp2_stream* s, grpc_slice slice, int is_last);
 
-  /* goaway data */
-  grpc_status_code goaway_error;
-  uint32_t goaway_last_stream_index;
-  grpc_slice goaway_text;
-
   grpc_chttp2_write_cb* write_cb_pool;
 
   /* bdp estimator */
diff --git a/src/core/ext/transport/chttp2/transport/parsing.cc b/src/core/ext/transport/chttp2/transport/parsing.cc
index 9400f54bf9..5731e9ff78 100644
--- a/src/core/ext/transport/chttp2/transport/parsing.cc
+++ b/src/core/ext/transport/chttp2/transport/parsing.cc
@@ -569,7 +569,11 @@ static grpc_error* init_header_frame_parser(grpc_chttp2_transport* t,
         GRPC_CHTTP2_IF_TRACING(gpr_log(
             GPR_ERROR, "ignoring new grpc_chttp2_stream creation on client"));
       }
-      return init_skip_frame_parser(t, 1);
+      grpc_error* err = init_skip_frame_parser(t, 1);
+      if (t->incoming_frame_flags & GRPC_CHTTP2_FLAG_HAS_PRIORITY) {
+        grpc_chttp2_hpack_parser_set_has_priority(&t->hpack_parser);
+      }
+      return err;
     } else if (t->last_new_stream_id >= t->incoming_stream_id) {
       GRPC_CHTTP2_IF_TRACING(gpr_log(
           GPR_ERROR,
diff --git a/src/core/lib/iomgr/ev_epoll1_linux.cc b/src/core/lib/iomgr/ev_epoll1_linux.cc
index af33742fbb..31f51df15d 100644
--- a/src/core/lib/iomgr/ev_epoll1_linux.cc
+++ b/src/core/lib/iomgr/ev_epoll1_linux.cc
@@ -18,6 +18,8 @@
 
 #include "src/core/lib/iomgr/port.h"
 
+#include <grpc/support/log.h>
+
 /* This polling engine is only relevant on linux kernels supporting epoll() */
 #ifdef GRPC_LINUX_EPOLL
 #include "src/core/lib/iomgr/ev_epoll1_linux.h"
@@ -34,7 +36,6 @@
 
 #include <grpc/support/alloc.h>
 #include <grpc/support/cpu.h>
-#include <grpc/support/log.h>
 #include <grpc/support/string_util.h>
 #include <grpc/support/tls.h>
 #include <grpc/support/useful.h>
@@ -46,6 +47,7 @@
 #include "src/core/lib/iomgr/lockfree_event.h"
 #include "src/core/lib/iomgr/wakeup_fd_posix.h"
 #include "src/core/lib/profiling/timers.h"
+#include "src/core/lib/support/manual_constructor.h"
 #include "src/core/lib/support/string.h"
 
 static grpc_wakeup_fd global_wakeup_fd;
@@ -111,8 +113,8 @@ static void epoll_set_shutdown() {
 struct grpc_fd {
   int fd;
 
-  gpr_atm read_closure;
-  gpr_atm write_closure;
+  grpc_core::ManualConstructor<grpc_core::LockfreeEvent> read_closure;
+  grpc_core::ManualConstructor<grpc_core::LockfreeEvent> write_closure;
 
   struct grpc_fd* freelist_next;
 
@@ -264,8 +266,8 @@ static grpc_fd* fd_create(int fd, const char* name) {
   }
 
   new_fd->fd = fd;
-  grpc_lfev_init(&new_fd->read_closure);
-  grpc_lfev_init(&new_fd->write_closure);
+  new_fd->read_closure.Init();
+  new_fd->write_closure.Init();
   gpr_atm_no_barrier_store(&new_fd->read_notifier_pollset, (gpr_atm)NULL);
 
   new_fd->freelist_next = NULL;
@@ -297,11 +299,11 @@ static int fd_wrapped_fd(grpc_fd* fd) { return fd->fd; }
  * shutdown() syscall on that fd) */
 static void fd_shutdown_internal(grpc_fd* fd, grpc_error* why,
                                  bool releasing_fd) {
-  if (grpc_lfev_set_shutdown(&fd->read_closure, GRPC_ERROR_REF(why))) {
+  if (fd->read_closure->SetShutdown(GRPC_ERROR_REF(why))) {
     if (!releasing_fd) {
       shutdown(fd->fd, SHUT_RDWR);
     }
-    grpc_lfev_set_shutdown(&fd->write_closure, GRPC_ERROR_REF(why));
+    fd->write_closure->SetShutdown(GRPC_ERROR_REF(why));
   }
   GRPC_ERROR_UNREF(why);
 }
@@ -316,7 +318,7 @@ static void fd_orphan(grpc_fd* fd, grpc_closure* on_done, int* release_fd,
   grpc_error* error = GRPC_ERROR_NONE;
   bool is_release_fd = (release_fd != NULL);
 
-  if (!grpc_lfev_is_shutdown(&fd->read_closure)) {
+  if (!fd->read_closure->IsShutdown()) {
     fd_shutdown_internal(fd, GRPC_ERROR_CREATE_FROM_COPIED_STRING(reason),
                          is_release_fd);
   }
@@ -332,8 +334,8 @@ static void fd_orphan(grpc_fd* fd, grpc_closure* on_done, int* release_fd,
   GRPC_CLOSURE_SCHED(on_done, GRPC_ERROR_REF(error));
 
   grpc_iomgr_unregister_object(&fd->iomgr_object);
-  grpc_lfev_destroy(&fd->read_closure);
-  grpc_lfev_destroy(&fd->write_closure);
+  fd->read_closure.Destroy();
+  fd->write_closure.Destroy();
 
   gpr_mu_lock(&fd_freelist_mu);
   fd->freelist_next = fd_freelist;
@@ -347,26 +349,24 @@ static grpc_pollset* fd_get_read_notifier_pollset(grpc_fd* fd) {
 }
 
 static bool fd_is_shutdown(grpc_fd* fd) {
-  return grpc_lfev_is_shutdown(&fd->read_closure);
+  return fd->read_closure->IsShutdown();
 }
 
 static void fd_notify_on_read(grpc_fd* fd, grpc_closure* closure) {
-  grpc_lfev_notify_on(&fd->read_closure, closure, "read");
+  fd->read_closure->NotifyOn(closure);
 }
 
 static void fd_notify_on_write(grpc_fd* fd, grpc_closure* closure) {
-  grpc_lfev_notify_on(&fd->write_closure, closure, "write");
+  fd->write_closure->NotifyOn(closure);
 }
 
 static void fd_become_readable(grpc_fd* fd, grpc_pollset* notifier) {
-  grpc_lfev_set_ready(&fd->read_closure, "read");
+  fd->read_closure->SetReady();
   /* Use release store to match with acquire load in fd_get_read_notifier */
   gpr_atm_rel_store(&fd->read_notifier_pollset, (gpr_atm)notifier);
 }
 
-static void fd_become_writable(grpc_fd* fd) {
-  grpc_lfev_set_ready(&fd->write_closure, "write");
-}
+static void fd_become_writable(grpc_fd* fd) { fd->write_closure->SetReady(); }
 
 /*******************************************************************************
  * Pollset Definitions
@@ -1205,6 +1205,7 @@ static const grpc_event_engine_vtable vtable = {
  * support is available */
 const grpc_event_engine_vtable* grpc_init_epoll1_linux(bool explicit_request) {
   if (!grpc_has_wakeup_fd()) {
+    gpr_log(GPR_ERROR, "Skipping epoll1 because of no wakeup fd.");
     return NULL;
   }
 
@@ -1229,6 +1230,8 @@ const grpc_event_engine_vtable* grpc_init_epoll1_linux(bool explicit_request) {
 /* If GRPC_LINUX_EPOLL is not defined, it means epoll is not available. Return
  * NULL */
 const grpc_event_engine_vtable* grpc_init_epoll1_linux(bool explicit_request) {
+  gpr_log(GPR_ERROR,
+          "Skipping epoll1 becuase GRPC_LINUX_EPOLL is not defined.");
   return NULL;
 }
 #endif /* defined(GRPC_POSIX_SOCKET) */
diff --git a/src/core/lib/iomgr/ev_epollex_linux.cc b/src/core/lib/iomgr/ev_epollex_linux.cc
index 54f7adeee0..0979a45270 100644
--- a/src/core/lib/iomgr/ev_epollex_linux.cc
+++ b/src/core/lib/iomgr/ev_epollex_linux.cc
@@ -18,6 +18,8 @@
 
 #include "src/core/lib/iomgr/port.h"
 
+#include <grpc/support/log.h>
+
 /* This polling engine is only relevant on linux kernels supporting epoll() */
 #ifdef GRPC_LINUX_EPOLL
 
@@ -34,7 +36,6 @@
 #include <unistd.h>
 
 #include <grpc/support/alloc.h>
-#include <grpc/support/log.h>
 #include <grpc/support/string_util.h>
 #include <grpc/support/tls.h>
 #include <grpc/support/useful.h>
@@ -48,6 +49,7 @@
 #include "src/core/lib/iomgr/timer.h"
 #include "src/core/lib/iomgr/wakeup_fd_posix.h"
 #include "src/core/lib/profiling/timers.h"
+#include "src/core/lib/support/manual_constructor.h"
 #include "src/core/lib/support/spinlock.h"
 
 // debug aid: create workers on the heap (allows asan to spot
@@ -153,8 +155,8 @@ struct grpc_fd {
   gpr_mu pollable_mu;
   pollable* pollable_obj;
 
-  gpr_atm read_closure;
-  gpr_atm write_closure;
+  grpc_core::ManualConstructor<grpc_core::LockfreeEvent> read_closure;
+  grpc_core::ManualConstructor<grpc_core::LockfreeEvent> write_closure;
 
   struct grpc_fd* freelist_next;
   grpc_closure* on_done_closure;
@@ -285,8 +287,8 @@ static void fd_destroy(void* arg, grpc_error* error) {
   fd->freelist_next = fd_freelist;
   fd_freelist = fd;
 
-  grpc_lfev_destroy(&fd->read_closure);
-  grpc_lfev_destroy(&fd->write_closure);
+  fd->read_closure.Destroy();
+  fd->write_closure.Destroy();
 
   gpr_mu_unlock(&fd_freelist_mu);
 }
@@ -345,8 +347,8 @@ static grpc_fd* fd_create(int fd, const char* name) {
   new_fd->pollable_obj = NULL;
   gpr_atm_rel_store(&new_fd->refst, (gpr_atm)1);
   new_fd->fd = fd;
-  grpc_lfev_init(&new_fd->read_closure);
-  grpc_lfev_init(&new_fd->write_closure);
+  new_fd->read_closure.Init();
+  new_fd->write_closure.Init();
   gpr_atm_no_barrier_store(&new_fd->read_notifier_pollset, (gpr_atm)NULL);
 
   new_fd->freelist_next = NULL;
@@ -407,24 +409,24 @@ static grpc_pollset* fd_get_read_notifier_pollset(grpc_fd* fd) {
 }
 
 static bool fd_is_shutdown(grpc_fd* fd) {
-  return grpc_lfev_is_shutdown(&fd->read_closure);
+  return fd->read_closure->IsShutdown();
 }
 
 /* Might be called multiple times */
 static void fd_shutdown(grpc_fd* fd, grpc_error* why) {
-  if (grpc_lfev_set_shutdown(&fd->read_closure, GRPC_ERROR_REF(why))) {
+  if (fd->read_closure->SetShutdown(GRPC_ERROR_REF(why))) {
     shutdown(fd->fd, SHUT_RDWR);
-    grpc_lfev_set_shutdown(&fd->write_closure, GRPC_ERROR_REF(why));
+    fd->write_closure->SetShutdown(GRPC_ERROR_REF(why));
   }
   GRPC_ERROR_UNREF(why);
 }
 
 static void fd_notify_on_read(grpc_fd* fd, grpc_closure* closure) {
-  grpc_lfev_notify_on(&fd->read_closure, closure, "read");
+  fd->read_closure->NotifyOn(closure);
 }
 
 static void fd_notify_on_write(grpc_fd* fd, grpc_closure* closure) {
-  grpc_lfev_notify_on(&fd->write_closure, closure, "write");
+  fd->write_closure->NotifyOn(closure);
 }
 
 /*******************************************************************************
@@ -690,7 +692,7 @@ static int poll_deadline_to_millis_timeout(grpc_millis millis) {
 }
 
 static void fd_become_readable(grpc_fd* fd, grpc_pollset* notifier) {
-  grpc_lfev_set_ready(&fd->read_closure, "read");
+  fd->read_closure->SetReady();
 
   /* Note, it is possible that fd_become_readable might be called twice with
      different 'notifier's when an fd becomes readable and it is in two epoll
@@ -701,9 +703,7 @@ static void fd_become_readable(grpc_fd* fd, grpc_pollset* notifier) {
   gpr_atm_rel_store(&fd->read_notifier_pollset, (gpr_atm)notifier);
 }
 
-static void fd_become_writable(grpc_fd* fd) {
-  grpc_lfev_set_ready(&fd->write_closure, "write");
-}
+static void fd_become_writable(grpc_fd* fd) { fd->write_closure->SetReady(); }
 
 static grpc_error* fd_get_or_become_pollable(grpc_fd* fd, pollable** p) {
   gpr_mu_lock(&fd->pollable_mu);
@@ -1422,10 +1422,12 @@ const grpc_event_engine_vtable* grpc_init_epollex_linux(
   }
 
   if (!grpc_has_wakeup_fd()) {
+    gpr_log(GPR_ERROR, "Skipping epollex because of no wakeup fd.");
     return NULL;
   }
 
   if (!grpc_is_epollexclusive_available()) {
+    gpr_log(GPR_INFO, "Skipping epollex because it is not supported.");
     return NULL;
   }
 
@@ -1451,6 +1453,8 @@ const grpc_event_engine_vtable* grpc_init_epollex_linux(
  * NULL */
 const grpc_event_engine_vtable* grpc_init_epollex_linux(
     bool explicitly_requested) {
+  gpr_log(GPR_ERROR,
+          "Skipping epollex becuase GRPC_LINUX_EPOLL is not defined.");
   return NULL;
 }
 #endif /* defined(GRPC_POSIX_SOCKET) */
diff --git a/src/core/lib/iomgr/ev_epollsig_linux.cc b/src/core/lib/iomgr/ev_epollsig_linux.cc
index 263fed78ad..c42a609fee 100644
--- a/src/core/lib/iomgr/ev_epollsig_linux.cc
+++ b/src/core/lib/iomgr/ev_epollsig_linux.cc
@@ -19,6 +19,7 @@
 #include "src/core/lib/iomgr/port.h"
 
 #include <grpc/grpc_posix.h>
+#include <grpc/support/log.h>
 
 /* This polling engine is only relevant on linux kernels supporting epoll() */
 #ifdef GRPC_LINUX_EPOLL
@@ -37,7 +38,6 @@
 #include <unistd.h>
 
 #include <grpc/support/alloc.h>
-#include <grpc/support/log.h>
 #include <grpc/support/string_util.h>
 #include <grpc/support/tls.h>
 #include <grpc/support/useful.h>
@@ -50,6 +50,7 @@
 #include "src/core/lib/iomgr/timer.h"
 #include "src/core/lib/iomgr/wakeup_fd_posix.h"
 #include "src/core/lib/profiling/timers.h"
+#include "src/core/lib/support/manual_constructor.h"
 
 #define GRPC_POLLSET_KICK_BROADCAST ((grpc_pollset_worker*)1)
 
@@ -127,8 +128,8 @@ struct grpc_fd {
      valid */
   bool orphaned;
 
-  gpr_atm read_closure;
-  gpr_atm write_closure;
+  grpc_core::ManualConstructor<grpc_core::LockfreeEvent> read_closure;
+  grpc_core::ManualConstructor<grpc_core::LockfreeEvent> write_closure;
 
   struct grpc_fd* freelist_next;
   grpc_closure* on_done_closure;
@@ -764,8 +765,8 @@ static void unref_by(grpc_fd* fd, int n) {
     fd_freelist = fd;
     grpc_iomgr_unregister_object(&fd->iomgr_object);
 
-    grpc_lfev_destroy(&fd->read_closure);
-    grpc_lfev_destroy(&fd->write_closure);
+    fd->read_closure.Destroy();
+    fd->write_closure.Destroy();
 
     gpr_mu_unlock(&fd_freelist_mu);
   } else {
@@ -830,8 +831,8 @@ static grpc_fd* fd_create(int fd, const char* name) {
   gpr_atm_rel_store(&new_fd->refst, (gpr_atm)1);
   new_fd->fd = fd;
   new_fd->orphaned = false;
-  grpc_lfev_init(&new_fd->read_closure);
-  grpc_lfev_init(&new_fd->write_closure);
+  new_fd->read_closure.Init();
+  new_fd->write_closure.Init();
   gpr_atm_no_barrier_store(&new_fd->read_notifier_pollset, (gpr_atm)NULL);
 
   new_fd->freelist_next = NULL;
@@ -920,24 +921,24 @@ static grpc_pollset* fd_get_read_notifier_pollset(grpc_fd* fd) {
 }
 
 static bool fd_is_shutdown(grpc_fd* fd) {
-  return grpc_lfev_is_shutdown(&fd->read_closure);
+  return fd->read_closure->IsShutdown();
 }
 
 /* Might be called multiple times */
 static void fd_shutdown(grpc_fd* fd, grpc_error* why) {
-  if (grpc_lfev_set_shutdown(&fd->read_closure, GRPC_ERROR_REF(why))) {
+  if (fd->read_closure->SetShutdown(GRPC_ERROR_REF(why))) {
     shutdown(fd->fd, SHUT_RDWR);
-    grpc_lfev_set_shutdown(&fd->write_closure, GRPC_ERROR_REF(why));
+    fd->write_closure->SetShutdown(GRPC_ERROR_REF(why));
   }
   GRPC_ERROR_UNREF(why);
 }
 
 static void fd_notify_on_read(grpc_fd* fd, grpc_closure* closure) {
-  grpc_lfev_notify_on(&fd->read_closure, closure, "read");
+  fd->read_closure->NotifyOn(closure);
 }
 
 static void fd_notify_on_write(grpc_fd* fd, grpc_closure* closure) {
-  grpc_lfev_notify_on(&fd->write_closure, closure, "write");
+  fd->write_closure->NotifyOn(closure);
 }
 
 /*******************************************************************************
@@ -1099,7 +1100,7 @@ static int poll_deadline_to_millis_timeout(grpc_millis millis) {
 }
 
 static void fd_become_readable(grpc_fd* fd, grpc_pollset* notifier) {
-  grpc_lfev_set_ready(&fd->read_closure, "read");
+  fd->read_closure->SetReady();
 
   /* Note, it is possible that fd_become_readable might be called twice with
      different 'notifier's when an fd becomes readable and it is in two epoll
@@ -1110,9 +1111,7 @@ static void fd_become_readable(grpc_fd* fd, grpc_pollset* notifier) {
   gpr_atm_rel_store(&fd->read_notifier_pollset, (gpr_atm)notifier);
 }
 
-static void fd_become_writable(grpc_fd* fd) {
-  grpc_lfev_set_ready(&fd->write_closure, "write");
-}
+static void fd_become_writable(grpc_fd* fd) { fd->write_closure->SetReady(); }
 
 static void pollset_release_polling_island(grpc_pollset* ps,
                                            const char* reason) {
@@ -1686,14 +1685,17 @@ const grpc_event_engine_vtable* grpc_init_epollsig_linux(
     bool explicit_request) {
   /* If use of signals is disabled, we cannot use epoll engine*/
   if (is_grpc_wakeup_signal_initialized && grpc_wakeup_signal < 0) {
+    gpr_log(GPR_ERROR, "Skipping epollsig because use of signals is disabled.");
     return NULL;
   }
 
   if (!grpc_has_wakeup_fd()) {
+    gpr_log(GPR_ERROR, "Skipping epollsig because of no wakeup fd.");
     return NULL;
   }
 
   if (!is_epoll_available()) {
+    gpr_log(GPR_ERROR, "Skipping epollsig because epoll is unavailable.");
     return NULL;
   }
 
@@ -1701,6 +1703,8 @@ const grpc_event_engine_vtable* grpc_init_epollsig_linux(
     if (explicit_request) {
       grpc_use_signal(SIGRTMIN + 6);
     } else {
+      gpr_log(GPR_ERROR,
+              "Skipping epollsig because uninitialized wakeup signal.");
       return NULL;
     }
   }
@@ -1726,6 +1730,8 @@ const grpc_event_engine_vtable* grpc_init_epollsig_linux(
  * NULL */
 const grpc_event_engine_vtable* grpc_init_epollsig_linux(
     bool explicit_request) {
+  gpr_log(GPR_ERROR,
+          "Skipping epollsig becuase GRPC_LINUX_EPOLL is not defined.");
   return NULL;
 }
 #endif /* defined(GRPC_POSIX_SOCKET) */
diff --git a/src/core/lib/iomgr/ev_poll_posix.cc b/src/core/lib/iomgr/ev_poll_posix.cc
index 37e4bf68db..c7189950f0 100644
--- a/src/core/lib/iomgr/ev_poll_posix.cc
+++ b/src/core/lib/iomgr/ev_poll_posix.cc
@@ -1689,6 +1689,7 @@ static const grpc_event_engine_vtable vtable = {
 
 const grpc_event_engine_vtable* grpc_init_poll_posix(bool explicit_request) {
   if (!grpc_has_wakeup_fd()) {
+    gpr_log(GPR_ERROR, "Skipping poll because of no wakeup fd.");
     return NULL;
   }
   if (!GRPC_LOG_IF_ERROR("pollset_global_init", pollset_global_init())) {
diff --git a/src/core/lib/iomgr/ev_posix.cc b/src/core/lib/iomgr/ev_posix.cc
index eeda6e7a52..9f84f67e5c 100644
--- a/src/core/lib/iomgr/ev_posix.cc
+++ b/src/core/lib/iomgr/ev_posix.cc
@@ -172,12 +172,12 @@ void grpc_event_engine_init(void) {
     gpr_free(strings[i]);
   }
   gpr_free(strings);
-  gpr_free(s);
 
   if (g_event_engine == NULL) {
-    gpr_log(GPR_ERROR, "No event engine could be initialized");
+    gpr_log(GPR_ERROR, "No event engine could be initialized from %s", s);
     abort();
   }
+  gpr_free(s);
 }
 
 void grpc_event_engine_shutdown(void) {
diff --git a/src/core/lib/iomgr/lockfree_event.cc b/src/core/lib/iomgr/lockfree_event.cc
index 2376165d7e..288e597c29 100644
--- a/src/core/lib/iomgr/lockfree_event.cc
+++ b/src/core/lib/iomgr/lockfree_event.cc
@@ -26,92 +26,96 @@ extern grpc_tracer_flag grpc_polling_trace;
 
 /* 'state' holds the to call when the fd is readable or writable respectively.
    It can contain one of the following values:
-     CLOSURE_READY     : The fd has an I/O event of interest but there is no
+     kClosureReady     : The fd has an I/O event of interest but there is no
                          closure yet to execute
 
-     CLOSURE_NOT_READY : The fd has no I/O event of interest
+     kClosureNotReady : The fd has no I/O event of interest
 
      closure ptr       : The closure to be executed when the fd has an I/O
                          event of interest
 
-     shutdown_error | FD_SHUTDOWN_BIT :
-                        'shutdown_error' field ORed with FD_SHUTDOWN_BIT.
+     shutdown_error | kShutdownBit :
+                        'shutdown_error' field ORed with kShutdownBit.
                          This indicates that the fd is shutdown. Since all
                          memory allocations are word-aligned, the lower two
                          bits of the shutdown_error pointer are always 0. So
-                         it is safe to OR these with FD_SHUTDOWN_BIT
+                         it is safe to OR these with kShutdownBit
 
    Valid state transitions:
 
-     <closure ptr> <-----3------ CLOSURE_NOT_READY ----1---->  CLOSURE_READY
+     <closure ptr> <-----3------ kClosureNotReady -----1------->  kClosureReady
        |  |                         ^   |    ^                         |  |
        |  |                         |   |    |                         |  |
        |  +--------------4----------+   6    +---------2---------------+  |
        |                                |                                 |
        |                                v                                 |
-       +-----5------->  [shutdown_error | FD_SHUTDOWN_BIT] <----7---------+
+       +-----5------->  [shutdown_error | kShutdownBit] <-------7---------+
 
-    For 1, 4 : See grpc_lfev_set_ready() function
-    For 2, 3 : See grpc_lfev_notify_on() function
-    For 5,6,7: See grpc_lfev_set_shutdown() function */
+    For 1, 4 : See SetReady() function
+    For 2, 3 : See NotifyOn() function
+    For 5,6,7: See SetShutdown() function */
 
-#define CLOSURE_NOT_READY ((gpr_atm)0)
-#define CLOSURE_READY ((gpr_atm)2)
+namespace grpc_core {
 
-#define FD_SHUTDOWN_BIT ((gpr_atm)1)
+LockfreeEvent::LockfreeEvent() {
+  /* Perform an atomic store to start the state machine.
 
-void grpc_lfev_init(gpr_atm* state) {
-  gpr_atm_no_barrier_store(state, CLOSURE_NOT_READY);
+     Note carefully that LockfreeEvent *MAY* be used whilst in a destroyed
+     state, while a file descriptor is on a freelist. In such a state it may
+     be SetReady'd, and so we need to perform an atomic operation here to
+     ensure no races */
+  gpr_atm_no_barrier_store(&state_, kClosureNotReady);
 }
 
-void grpc_lfev_destroy(gpr_atm* state) {
-  gpr_atm curr = gpr_atm_no_barrier_load(state);
-  if (curr & FD_SHUTDOWN_BIT) {
-    GRPC_ERROR_UNREF((grpc_error*)(curr & ~FD_SHUTDOWN_BIT));
-  } else {
-    GPR_ASSERT(curr == CLOSURE_NOT_READY || curr == CLOSURE_READY);
-  }
-}
-
-bool grpc_lfev_is_shutdown(gpr_atm* state) {
-  gpr_atm curr = gpr_atm_no_barrier_load(state);
-  return (curr & FD_SHUTDOWN_BIT) != 0;
+LockfreeEvent::~LockfreeEvent() {
+  gpr_atm curr;
+  do {
+    curr = gpr_atm_no_barrier_load(&state_);
+    if (curr & kShutdownBit) {
+      GRPC_ERROR_UNREF((grpc_error*)(curr & ~kShutdownBit));
+    } else {
+      GPR_ASSERT(curr == kClosureNotReady || curr == kClosureReady);
+    }
+    /* we CAS in a shutdown, no error value here. If this event is interacted
+       with post-deletion (see the note in the constructor) we want the bit
+       pattern to prevent error retention in a deleted object */
+  } while (!gpr_atm_no_barrier_cas(&state_, curr,
+                                   kShutdownBit /* shutdown, no error */));
 }
 
-void grpc_lfev_notify_on(gpr_atm* state, grpc_closure* closure,
-                         const char* variable) {
+void LockfreeEvent::NotifyOn(grpc_closure* closure) {
   while (true) {
-    gpr_atm curr = gpr_atm_no_barrier_load(state);
+    gpr_atm curr = gpr_atm_no_barrier_load(&state_);
     if (GRPC_TRACER_ON(grpc_polling_trace)) {
-      gpr_log(GPR_ERROR, "lfev_notify_on[%s]: %p curr=%p closure=%p", variable,
-              state, (void*)curr, closure);
+      gpr_log(GPR_ERROR, "LockfreeEvent::NotifyOn: %p curr=%p closure=%p", this,
+              (void*)curr, closure);
     }
     switch (curr) {
-      case CLOSURE_NOT_READY: {
-        /* CLOSURE_NOT_READY -> <closure>.
+      case kClosureNotReady: {
+        /* kClosureNotReady -> <closure>.
 
            We're guaranteed by API that there's an acquire barrier before here,
            so there's no need to double-dip and this can be a release-only.
 
            The release itself pairs with the acquire half of a set_ready full
            barrier. */
-        if (gpr_atm_rel_cas(state, CLOSURE_NOT_READY, (gpr_atm)closure)) {
+        if (gpr_atm_rel_cas(&state_, kClosureNotReady, (gpr_atm)closure)) {
           return; /* Successful. Return */
         }
 
         break; /* retry */
       }
 
-      case CLOSURE_READY: {
-        /* Change the state to CLOSURE_NOT_READY. Schedule the closure if
+      case kClosureReady: {
+        /* Change the state to kClosureNotReady. Schedule the closure if
            successful. If not, the state most likely transitioned to shutdown.
            We should retry.
 
            This can be a no-barrier cas since the state is being transitioned to
-           CLOSURE_NOT_READY; set_ready and set_shutdown do not schedule any
+           kClosureNotReady; set_ready and set_shutdown do not schedule any
            closure when transitioning out of CLOSURE_NO_READY state (i.e there
            is no other code that needs to 'happen-after' this) */
-        if (gpr_atm_no_barrier_cas(state, CLOSURE_READY, CLOSURE_NOT_READY)) {
+        if (gpr_atm_no_barrier_cas(&state_, kClosureReady, kClosureNotReady)) {
           GRPC_CLOSURE_SCHED(closure, GRPC_ERROR_NONE);
           return; /* Successful. Return */
         }
@@ -123,8 +127,8 @@ void grpc_lfev_notify_on(gpr_atm* state, grpc_closure* closure,
         /* 'curr' is either a closure or the fd is shutdown(in which case 'curr'
            contains a pointer to the shutdown-error). If the fd is shutdown,
            schedule the closure with the shutdown error */
-        if ((curr & FD_SHUTDOWN_BIT) > 0) {
-          grpc_error* shutdown_err = (grpc_error*)(curr & ~FD_SHUTDOWN_BIT);
+        if ((curr & kShutdownBit) > 0) {
+          grpc_error* shutdown_err = (grpc_error*)(curr & ~kShutdownBit);
           GRPC_CLOSURE_SCHED(closure,
                              GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING(
                                  "FD Shutdown", &shutdown_err, 1));
@@ -133,7 +137,8 @@ void grpc_lfev_notify_on(gpr_atm* state, grpc_closure* closure,
 
         /* There is already a closure!. This indicates a bug in the code */
         gpr_log(GPR_ERROR,
-                "notify_on called with a previous callback still pending");
+                "LockfreeEvent::NotifyOn: notify_on called with a previous "
+                "callback still pending");
         abort();
       }
     }
@@ -142,21 +147,21 @@ void grpc_lfev_notify_on(gpr_atm* state, grpc_closure* closure,
   GPR_UNREACHABLE_CODE(return );
 }
 
-bool grpc_lfev_set_shutdown(gpr_atm* state, grpc_error* shutdown_err) {
-  gpr_atm new_state = (gpr_atm)shutdown_err | FD_SHUTDOWN_BIT;
+bool LockfreeEvent::SetShutdown(grpc_error* shutdown_err) {
+  gpr_atm new_state = (gpr_atm)shutdown_err | kShutdownBit;
 
   while (true) {
-    gpr_atm curr = gpr_atm_no_barrier_load(state);
+    gpr_atm curr = gpr_atm_no_barrier_load(&state_);
     if (GRPC_TRACER_ON(grpc_polling_trace)) {
-      gpr_log(GPR_ERROR, "lfev_set_shutdown: %p curr=%p err=%s", state,
-              (void*)curr, grpc_error_string(shutdown_err));
+      gpr_log(GPR_ERROR, "LockfreeEvent::SetShutdown: %p curr=%p err=%s",
+              &state_, (void*)curr, grpc_error_string(shutdown_err));
     }
     switch (curr) {
-      case CLOSURE_READY:
-      case CLOSURE_NOT_READY:
+      case kClosureReady:
+      case kClosureNotReady:
         /* Need a full barrier here so that the initial load in notify_on
            doesn't need a barrier */
-        if (gpr_atm_full_cas(state, curr, new_state)) {
+        if (gpr_atm_full_cas(&state_, curr, new_state)) {
           return true; /* early out */
         }
         break; /* retry */
@@ -165,7 +170,7 @@ bool grpc_lfev_set_shutdown(gpr_atm* state, grpc_error* shutdown_err) {
         /* 'curr' is either a closure or the fd is already shutdown */
 
         /* If fd is already shutdown, we are done */
-        if ((curr & FD_SHUTDOWN_BIT) > 0) {
+        if ((curr & kShutdownBit) > 0) {
           GRPC_ERROR_UNREF(shutdown_err);
           return false;
         }
@@ -175,7 +180,7 @@ bool grpc_lfev_set_shutdown(gpr_atm* state, grpc_error* shutdown_err) {
            Needs an acquire to pair with setting the closure (and get a
            happens-after on that edge), and a release to pair with anything
            loading the shutdown state. */
-        if (gpr_atm_full_cas(state, curr, new_state)) {
+        if (gpr_atm_full_cas(&state_, curr, new_state)) {
           GRPC_CLOSURE_SCHED((grpc_closure*)curr,
                              GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING(
                                  "FD Shutdown", &shutdown_err, 1));
@@ -192,25 +197,25 @@ bool grpc_lfev_set_shutdown(gpr_atm* state, grpc_error* shutdown_err) {
   GPR_UNREACHABLE_CODE(return false);
 }
 
-void grpc_lfev_set_ready(gpr_atm* state, const char* variable) {
+void LockfreeEvent::SetReady() {
   while (true) {
-    gpr_atm curr = gpr_atm_no_barrier_load(state);
+    gpr_atm curr = gpr_atm_no_barrier_load(&state_);
 
     if (GRPC_TRACER_ON(grpc_polling_trace)) {
-      gpr_log(GPR_ERROR, "lfev_set_ready[%s]: %p curr=%p", variable, state,
+      gpr_log(GPR_ERROR, "LockfreeEvent::SetReady: %p curr=%p", &state_,
               (void*)curr);
     }
 
     switch (curr) {
-      case CLOSURE_READY: {
+      case kClosureReady: {
         /* Already ready. We are done here */
         return;
       }
 
-      case CLOSURE_NOT_READY: {
+      case kClosureNotReady: {
         /* No barrier required as we're transitioning to a state that does not
            involve a closure */
-        if (gpr_atm_no_barrier_cas(state, CLOSURE_NOT_READY, CLOSURE_READY)) {
+        if (gpr_atm_no_barrier_cas(&state_, kClosureNotReady, kClosureReady)) {
           return; /* early out */
         }
         break; /* retry */
@@ -218,14 +223,14 @@ void grpc_lfev_set_ready(gpr_atm* state, const char* variable) {
 
       default: {
         /* 'curr' is either a closure or the fd is shutdown */
-        if ((curr & FD_SHUTDOWN_BIT) > 0) {
+        if ((curr & kShutdownBit) > 0) {
           /* The fd is shutdown. Do nothing */
           return;
         }
         /* Full cas: acquire pairs with this cas' release in the event of a
            spurious set_ready; release pairs with this or the acquire in
            notify_on (or set_shutdown) */
-        else if (gpr_atm_full_cas(state, curr, CLOSURE_NOT_READY)) {
+        else if (gpr_atm_full_cas(&state_, curr, kClosureNotReady)) {
           GRPC_CLOSURE_SCHED((grpc_closure*)curr, GRPC_ERROR_NONE);
           return;
         }
@@ -237,3 +242,5 @@ void grpc_lfev_set_ready(gpr_atm* state, const char* variable) {
     }
   }
 }
+
+}  // namespace grpc_core
diff --git a/src/core/lib/iomgr/lockfree_event.h b/src/core/lib/iomgr/lockfree_event.h
index 08a1ae40a6..70fa1ac89d 100644
--- a/src/core/lib/iomgr/lockfree_event.h
+++ b/src/core/lib/iomgr/lockfree_event.h
@@ -25,22 +25,30 @@
 
 #include "src/core/lib/iomgr/exec_ctx.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-void grpc_lfev_init(gpr_atm* state);
-void grpc_lfev_destroy(gpr_atm* state);
-bool grpc_lfev_is_shutdown(gpr_atm* state);
-
-void grpc_lfev_notify_on(gpr_atm* state, grpc_closure* closure,
-                         const char* variable);
-/* Returns true on first successful shutdown */
-bool grpc_lfev_set_shutdown(gpr_atm* state, grpc_error* shutdown_err);
-void grpc_lfev_set_ready(gpr_atm* state, const char* variable);
-
-#ifdef __cplusplus
-}
-#endif
+namespace grpc_core {
+
+class LockfreeEvent {
+ public:
+  LockfreeEvent();
+  ~LockfreeEvent();
+
+  LockfreeEvent(const LockfreeEvent&) = delete;
+  LockfreeEvent& operator=(const LockfreeEvent&) = delete;
+
+  bool IsShutdown() const {
+    return (gpr_atm_no_barrier_load(&state_) & kShutdownBit) != 0;
+  }
+
+  void NotifyOn(grpc_closure* closure);
+  bool SetShutdown(grpc_error* error);
+  void SetReady();
+
+ private:
+  enum State { kClosureNotReady = 0, kClosureReady = 2, kShutdownBit = 1 };
+
+  gpr_atm state_;
+};
+
+}  // namespace grpc_core
 
 #endif /* GRPC_CORE_LIB_IOMGR_LOCKFREE_EVENT_H */
diff --git a/src/core/lib/iomgr/pollset_uv.cc b/src/core/lib/iomgr/pollset_uv.cc
index 6a83c9ca04..7028876297 100644
--- a/src/core/lib/iomgr/pollset_uv.cc
+++ b/src/core/lib/iomgr/pollset_uv.cc
@@ -40,7 +40,7 @@ grpc_tracer_flag grpc_trace_fd_refcount =
 #endif
 
 struct grpc_pollset {
-  uv_timer_t timer;
+  uv_timer_t* timer;
   int shutting_down;
 };
 
@@ -78,12 +78,16 @@ void grpc_pollset_global_shutdown(void) {
 
 static void timer_run_cb(uv_timer_t* timer) {}
 
-static void timer_close_cb(uv_handle_t* handle) { handle->data = (void*)1; }
+static void timer_close_cb(uv_handle_t* handle) {
+  handle->data = (void*)1;
+  gpr_free(handle);
+}
 
 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->timer = (uv_timer_t*)gpr_malloc(sizeof(uv_timer_t));
+  uv_timer_init(uv_default_loop(), pollset->timer);
   pollset->shutting_down = 0;
 }
 
@@ -103,11 +107,11 @@ void grpc_pollset_shutdown(grpc_pollset* pollset, grpc_closure* closure) {
 
 void grpc_pollset_destroy(grpc_pollset* pollset) {
   GRPC_UV_ASSERT_SAME_THREAD();
-  uv_close((uv_handle_t*)&pollset->timer, timer_close_cb);
+  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;
+  pollset->timer->data = (void*)0;
   if (grpc_pollset_work_run_loop) {
-    while (!pollset->timer.data) {
+    while (!pollset->timer->data) {
       uv_run(uv_default_loop(), UV_RUN_NOWAIT);
     }
   }
@@ -129,11 +133,11 @@ grpc_error* grpc_pollset_work(grpc_pollset* pollset,
     /* We special-case timeout=0 so that we don't bother with the timer when
        the loop won't block anyway */
     if (timeout > 0) {
-      uv_timer_start(&pollset->timer, timer_run_cb, timeout, 0);
+      uv_timer_start(pollset->timer, timer_run_cb, timeout, 0);
       /* Run until there is some I/O activity or the timer triggers. It doesn't
          matter which happens */
       uv_run(uv_default_loop(), UV_RUN_ONCE);
-      uv_timer_stop(&pollset->timer);
+      uv_timer_stop(pollset->timer);
     } else {
       uv_run(uv_default_loop(), UV_RUN_NOWAIT);
     }
diff --git a/test/core/end2end/data/client_certs.cc b/test/core/end2end/data/client_certs.cc
index 6e61501234..7e0b10da5c 100644
--- a/test/core/end2end/data/client_certs.cc
+++ b/test/core/end2end/data/client_certs.cc
@@ -16,9 +16,7 @@
  *
  */
 
-#include "test/core/end2end/data/ssl_test_data.h"
-
-const char test_self_signed_client_cert[] = {
+extern "C" const char test_self_signed_client_cert[] = {
     0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x42, 0x45, 0x47, 0x49, 0x4e, 0x20, 0x43,
     0x45, 0x52, 0x54, 0x49, 0x46, 0x49, 0x43, 0x41, 0x54, 0x45, 0x2d, 0x2d,
     0x2d, 0x2d, 0x2d, 0x0a, 0x4d, 0x49, 0x49, 0x43, 0x6f, 0x44, 0x43, 0x43,
@@ -102,7 +100,7 @@ const char test_self_signed_client_cert[] = {
     0x49, 0x46, 0x49, 0x43, 0x41, 0x54, 0x45, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d,
     0x0a, 0x00};
 
-const char test_self_signed_client_key[] = {
+extern "C" const char test_self_signed_client_key[] = {
     0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x42, 0x45, 0x47, 0x49, 0x4e, 0x20, 0x50,
     0x52, 0x49, 0x56, 0x41, 0x54, 0x45, 0x20, 0x4b, 0x45, 0x59, 0x2d, 0x2d,
     0x2d, 0x2d, 0x2d, 0x0a, 0x4d, 0x49, 0x49, 0x43, 0x64, 0x77, 0x49, 0x42,
@@ -181,7 +179,7 @@ const char test_self_signed_client_key[] = {
     0x52, 0x49, 0x56, 0x41, 0x54, 0x45, 0x20, 0x4b, 0x45, 0x59, 0x2d, 0x2d,
     0x2d, 0x2d, 0x2d, 0x0a, 0x00};
 
-const char test_signed_client_cert[] = {
+extern "C" const char test_signed_client_cert[] = {
     0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x42, 0x45, 0x47, 0x49, 0x4e, 0x20, 0x43,
     0x45, 0x52, 0x54, 0x49, 0x46, 0x49, 0x43, 0x41, 0x54, 0x45, 0x2d, 0x2d,
     0x2d, 0x2d, 0x2d, 0x0a, 0x4d, 0x49, 0x49, 0x43, 0x48, 0x7a, 0x43, 0x43,
@@ -250,7 +248,7 @@ const char test_signed_client_cert[] = {
     0x20, 0x43, 0x45, 0x52, 0x54, 0x49, 0x46, 0x49, 0x43, 0x41, 0x54, 0x45,
     0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x0a, 0x00};
 
-const char test_signed_client_key[] = {
+extern "C" const char test_signed_client_key[] = {
     0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x42, 0x45, 0x47, 0x49, 0x4e, 0x20, 0x50,
     0x52, 0x49, 0x56, 0x41, 0x54, 0x45, 0x20, 0x4b, 0x45, 0x59, 0x2d, 0x2d,
     0x2d, 0x2d, 0x2d, 0x0a, 0x4d, 0x49, 0x49, 0x43, 0x65, 0x51, 0x49, 0x42,
diff --git a/test/core/end2end/data/server1_cert.cc b/test/core/end2end/data/server1_cert.cc
index 5e017c4da7..dd09810732 100644
--- a/test/core/end2end/data/server1_cert.cc
+++ b/test/core/end2end/data/server1_cert.cc
@@ -16,9 +16,7 @@
  *
  */
 
-#include "test/core/end2end/data/ssl_test_data.h"
-
-const char test_server1_cert[] = {
+extern "C" const char test_server1_cert[] = {
     0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x42, 0x45, 0x47, 0x49, 0x4e, 0x20, 0x43,
     0x45, 0x52, 0x54, 0x49, 0x46, 0x49, 0x43, 0x41, 0x54, 0x45, 0x2d, 0x2d,
     0x2d, 0x2d, 0x2d, 0x0a, 0x4d, 0x49, 0x49, 0x43, 0x6e, 0x44, 0x43, 0x43,
diff --git a/test/core/end2end/data/server1_key.cc b/test/core/end2end/data/server1_key.cc
index 92a77aa21f..59dcaf6334 100644
--- a/test/core/end2end/data/server1_key.cc
+++ b/test/core/end2end/data/server1_key.cc
@@ -16,9 +16,7 @@
  *
  */
 
-#include "test/core/end2end/data/ssl_test_data.h"
-
-const char test_server1_key[] = {
+extern "C" const char test_server1_key[] = {
     0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x42, 0x45, 0x47, 0x49, 0x4e, 0x20, 0x52,
     0x53, 0x41, 0x20, 0x50, 0x52, 0x49, 0x56, 0x41, 0x54, 0x45, 0x20, 0x4b,
     0x45, 0x59, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x0a, 0x4d, 0x49, 0x49, 0x43,
diff --git a/test/core/end2end/data/test_root_cert.cc b/test/core/end2end/data/test_root_cert.cc
index 81ca410e14..36fca2e45f 100644
--- a/test/core/end2end/data/test_root_cert.cc
+++ b/test/core/end2end/data/test_root_cert.cc
@@ -16,9 +16,7 @@
  *
  */
 
-#include "test/core/end2end/data/ssl_test_data.h"
-
-const char test_root_cert[] = {
+extern "C" const char test_root_cert[] = {
     0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x42, 0x45, 0x47, 0x49, 0x4e, 0x20, 0x43,
     0x45, 0x52, 0x54, 0x49, 0x46, 0x49, 0x43, 0x41, 0x54, 0x45, 0x2d, 0x2d,
     0x2d, 0x2d, 0x2d, 0x0a, 0x4d, 0x49, 0x49, 0x43, 0x49, 0x7a, 0x43, 0x43,
diff --git a/test/core/support/cpu_test.cc b/test/core/support/cpu_test.cc
index a76531ead9..c69ce55a73 100644
--- a/test/core/support/cpu_test.cc
+++ b/test/core/support/cpu_test.cc
@@ -68,7 +68,7 @@ static void worker_thread(void* arg) {
   unsigned i, j;
   /* Avoid repetitive division calculations */
   int64_t max_i = 1000 / grpc_test_slowdown_factor();
-  int64_t max_j = 1000000 / grpc_test_slowdown_factor();
+  int64_t max_j = 1000 / grpc_test_slowdown_factor();
   for (i = 0; i < max_i; i++) {
     /* run for a bit - just calculate something random. */
     for (j = 0; j < max_j; j++) {
diff --git a/tools/dockerfile/grpc_artifact_linux_x64/Dockerfile b/tools/dockerfile/grpc_artifact_linux_x64/Dockerfile
new file mode 100644
index 0000000000..0251b2b392
--- /dev/null
+++ b/tools/dockerfile/grpc_artifact_linux_x64/Dockerfile
@@ -0,0 +1,88 @@
+# Copyright 2016 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.
+
+# Docker file for building gRPC artifacts.
+
+FROM debian:jessie
+
+RUN apt-get update && apt-get install debian-keyring && apt-key update
+
+# Install Git and basic packages.
+RUN apt-get update && apt-key update && apt-get install -y \
+  autoconf \
+  autotools-dev \
+  build-essential \
+  bzip2 \
+  clang \
+  curl \
+  gcc \
+  gcc-multilib \
+  git \
+  golang \
+  libc6 \
+  libc6-dbg \
+  libc6-dev \
+  libgtest-dev \
+  libtool \
+  make \
+  perl \
+  strace \
+  python-dev \
+  python-setuptools \
+  python-yaml \
+  telnet \
+  unzip \
+  wget \
+  zip && apt-get clean
+
+# Install Node dependencies
+RUN touch .profile
+RUN curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.25.4/install.sh | bash
+RUN /bin/bash -l -c "nvm install 8 && npm install -g node-pre-gyp"
+
+
+##################
+# Ruby dependencies
+
+# Install rvm
+RUN gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
+RUN \curl -sSL https://get.rvm.io | bash -s stable
+
+# Install Ruby 2.1
+RUN /bin/bash -l -c "rvm install ruby-2.1"
+RUN /bin/bash -l -c "rvm use --default ruby-2.1"
+RUN /bin/bash -l -c "echo 'gem: --no-ri --no-rdoc' > ~/.gemrc"
+RUN /bin/bash -l -c "echo 'export PATH=/usr/local/rvm/bin:$PATH' >> ~/.bashrc"
+RUN /bin/bash -l -c "echo 'rvm --default use ruby-2.1' >> ~/.bashrc"
+RUN /bin/bash -l -c "gem install bundler --no-ri --no-rdoc"
+
+
+##################
+# PHP dependencies
+
+RUN apt-get update && apt-get install -y \
+    php5 php5-dev php-pear phpunit
+
+##################
+# Install cross compiler for ARM
+
+RUN echo 'deb http://emdebian.org/tools/debian/ jessie main' | tee -a /etc/apt/sources.list.d/crosstools.list && \
+  curl http://emdebian.org/tools/debian/emdebian-toolchain-archive.key | apt-key add -
+
+RUN dpkg --add-architecture armhf && apt-get update && apt-get install -y crossbuild-essential-armhf
+
+RUN mkdir /var/local/jenkins
+
+# Define the default command.
+CMD ["bash"]
diff --git a/tools/dockerfile/grpc_artifact_linux_x86/Dockerfile b/tools/dockerfile/grpc_artifact_linux_x86/Dockerfile
new file mode 100644
index 0000000000..2d179c8c45
--- /dev/null
+++ b/tools/dockerfile/grpc_artifact_linux_x86/Dockerfile
@@ -0,0 +1,73 @@
+# Copyright 2016 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.
+
+# Docker file for building gRPC artifacts.
+
+FROM 32bit/debian:jessie
+
+RUN apt-get update && apt-get install debian-keyring && apt-key update
+
+# Install Git and basic packages.
+RUN apt-get update && apt-key update && apt-get install -y \
+  autoconf \
+  autotools-dev \
+  build-essential \
+  bzip2 \
+  clang \
+  curl \
+  gcc \
+  gcc-multilib \
+  git \
+  golang \
+  libc6 \
+  libc6-dbg \
+  libc6-dev \
+  libgtest-dev \
+  libtool \
+  make \
+  perl \
+  strace \
+  python-dev \
+  python-setuptools \
+  python-yaml \
+  telnet \
+  unzip \
+  wget \
+  zip && apt-get clean
+
+# Install Node dependencies
+RUN touch .profile
+RUN curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.25.4/install.sh | bash
+RUN /bin/bash -l -c "nvm install 8 && npm install -g node-pre-gyp"
+
+
+##################
+# Ruby dependencies
+
+# Install rvm
+RUN gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
+RUN \curl -sSL https://get.rvm.io | bash -s stable
+
+# Install Ruby 2.1
+RUN /bin/bash -l -c "rvm install ruby-2.1"
+RUN /bin/bash -l -c "rvm use --default ruby-2.1"
+RUN /bin/bash -l -c "echo 'gem: --no-ri --no-rdoc' > ~/.gemrc"
+RUN /bin/bash -l -c "echo 'export PATH=/usr/local/rvm/bin:$PATH' >> ~/.bashrc"
+RUN /bin/bash -l -c "echo 'rvm --default use ruby-2.1' >> ~/.bashrc"
+RUN /bin/bash -l -c "gem install bundler --no-ri --no-rdoc"
+
+RUN mkdir /var/local/jenkins
+
+# Define the default command.
+CMD ["bash"]
diff --git a/tools/run_tests/generated/tests.json b/tools/run_tests/generated/tests.json
index 5ba06bf1a0..5df5a7477b 100644
--- a/tools/run_tests/generated/tests.json
+++ b/tools/run_tests/generated/tests.json
@@ -2964,9 +2964,7 @@
     "uses_polling": false
   }, 
   {
-    "args": [
-      "--benchmark_min_time=0"
-    ], 
+    "args": [], 
     "benchmark": true, 
     "ci_platforms": [
       "linux", 
@@ -2988,9 +2986,7 @@
     "uses_polling": false
   }, 
   {
-    "args": [
-      "--benchmark_min_time=0"
-    ], 
+    "args": [], 
     "benchmark": true, 
     "ci_platforms": [
       "linux", 
@@ -3012,9 +3008,7 @@
     "uses_polling": false
   }, 
   {
-    "args": [
-      "--benchmark_min_time=0"
-    ], 
+    "args": [], 
     "benchmark": true, 
     "ci_platforms": [
       "linux", 
@@ -3036,9 +3030,7 @@
     "uses_polling": false
   }, 
   {
-    "args": [
-      "--benchmark_min_time=0"
-    ], 
+    "args": [], 
     "benchmark": true, 
     "ci_platforms": [
       "linux", 
@@ -3060,9 +3052,7 @@
     "uses_polling": true
   }, 
   {
-    "args": [
-      "--benchmark_min_time=0"
-    ], 
+    "args": [], 
     "benchmark": true, 
     "ci_platforms": [
       "linux", 
@@ -3084,9 +3074,7 @@
     "uses_polling": true
   }, 
   {
-    "args": [
-      "--benchmark_min_time=0"
-    ], 
+    "args": [], 
     "benchmark": true, 
     "ci_platforms": [
       "linux", 
@@ -3108,9 +3096,7 @@
     "uses_polling": true
   }, 
   {
-    "args": [
-      "--benchmark_min_time=4"
-    ], 
+    "args": [], 
     "benchmark": true, 
     "ci_platforms": [
       "linux", 
@@ -3132,9 +3118,7 @@
     "uses_polling": true
   }, 
   {
-    "args": [
-      "--benchmark_min_time=0"
-    ], 
+    "args": [], 
     "benchmark": true, 
     "ci_platforms": [
       "linux", 
@@ -3156,9 +3140,7 @@
     "uses_polling": false
   }, 
   {
-    "args": [
-      "--benchmark_min_time=0"
-    ], 
+    "args": [], 
     "benchmark": true, 
     "ci_platforms": [
       "linux", 
@@ -3185,9 +3167,7 @@
     "uses_polling": true
   }, 
   {
-    "args": [
-      "--benchmark_min_time=0"
-    ], 
+    "args": [], 
     "benchmark": true, 
     "ci_platforms": [
       "linux", 
@@ -3214,9 +3194,7 @@
     "uses_polling": true
   }, 
   {
-    "args": [
-      "--benchmark_min_time=0"
-    ], 
+    "args": [], 
     "benchmark": true, 
     "ci_platforms": [
       "linux", 
@@ -3245,9 +3223,7 @@
     "uses_polling": true
   }, 
   {
-    "args": [
-      "--benchmark_min_time=0"
-    ], 
+    "args": [], 
     "benchmark": true, 
     "ci_platforms": [
       "linux", 
@@ -3274,9 +3250,7 @@
     "uses_polling": true
   }, 
   {
-    "args": [
-      "--benchmark_min_time=0"
-    ], 
+    "args": [], 
     "benchmark": true, 
     "ci_platforms": [
       "linux", 
@@ -3298,9 +3272,7 @@
     "uses_polling": false
   }, 
   {
-    "args": [
-      "--benchmark_min_time=0"
-    ], 
+    "args": [], 
     "benchmark": true, 
     "ci_platforms": [
       "linux",