From 53fb702512fda050b9405de8a6f11404d763e68b Mon Sep 17 00:00:00 2001
From: Peter Johnson <johnson.peter@gmail.com>
Date: Mon, 13 Jul 2015 22:56:58 -0700
Subject: [PATCH] ConcurrentQueue: Add empty() function.

Change-Id: I563c0343f70a5e4577a6387914d821728cbdd007
---
 src/support/ConcurrentQueue.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/support/ConcurrentQueue.h b/src/support/ConcurrentQueue.h
index dcbc039dae..3a62ebc537 100644
--- a/src/support/ConcurrentQueue.h
+++ b/src/support/ConcurrentQueue.h
@@ -15,6 +15,11 @@
 template <typename T>
 class ConcurrentQueue {
  public:
+  bool empty() const {
+    std::unique_lock<std::mutex> mlock(mutex_);
+    return queue_.empty();
+  }
+
   T pop() {
     std::unique_lock<std::mutex> mlock(mutex_);
     while (queue_.empty()) {