From ce856d27f4c25b213250b9577b4a0dd3467a8567 Mon Sep 17 00:00:00 2001
From: Yunjia Wang <yunjiaw@google.com>
Date: Tue, 18 Jun 2019 11:16:24 -0700
Subject: [PATCH] Add extern declaration and adjust header

---
 src/core/lib/iomgr/threadpool/mpmcqueue.cc | 8 +++++---
 src/core/lib/iomgr/threadpool/mpmcqueue.h  | 3 +++
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/core/lib/iomgr/threadpool/mpmcqueue.cc b/src/core/lib/iomgr/threadpool/mpmcqueue.cc
index 64f7d19a2a7..a59d62e5750 100644
--- a/src/core/lib/iomgr/threadpool/mpmcqueue.cc
+++ b/src/core/lib/iomgr/threadpool/mpmcqueue.cc
@@ -18,14 +18,16 @@
 
 #include "src/core/lib/iomgr/threadpool/mpmcqueue.h"
 
+#include <grpc/support/port_platform.h>
+
+#include <inttypes.h>
+#include <string.h>
+
 #include <grpc/support/alloc.h>
 #include <grpc/support/cpu.h>
 #include <grpc/support/log.h>
-#include <grpc/support/port_platform.h>
 #include <grpc/support/sync.h>
 #include <grpc/support/time.h>
-#include <inttypes.h>
-#include <string.h>
 
 #include "src/core/lib/debug/stats.h"
 #include "src/core/lib/gprpp/sync.h"
diff --git a/src/core/lib/iomgr/threadpool/mpmcqueue.h b/src/core/lib/iomgr/threadpool/mpmcqueue.h
index b39c9d81f4f..2d77a281c5b 100644
--- a/src/core/lib/iomgr/threadpool/mpmcqueue.h
+++ b/src/core/lib/iomgr/threadpool/mpmcqueue.h
@@ -24,11 +24,14 @@
 #include <grpc/support/alloc.h>
 #include <grpc/support/time.h>
 
+#include "src/core/lib/debug/stats.h"
 #include "src/core/lib/gprpp/atomic.h"
 #include "src/core/lib/gprpp/sync.h"
 
 namespace grpc_core {
 
+extern DebugOnlyTraceFlag thread_pool_trace;
+
 // Abstract base class of a MPMC queue interface
 class MPMCQueueInterface {
  public: