From 2389aa2da9856de6a364b47505df5cd76dc55373 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=A3=8E?= <invalid_ms_user@live.com>
Date: Wed, 18 Sep 2019 14:23:40 -0700
Subject: [PATCH] Remove unneeded unlock statement (#5809)

Summary:
The dtor will automatically do unlock
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5809

Differential Revision: D17453694

Pulled By: ltamasi

fbshipit-source-id: 5348bff8e6a620a05ff639a5454e8d82ae98a22d
---
 util/threadpool_imp.cc | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/util/threadpool_imp.cc b/util/threadpool_imp.cc
index 1a597e248..2e71f223f 100644
--- a/util/threadpool_imp.cc
+++ b/util/threadpool_imp.cc
@@ -313,9 +313,8 @@ void ThreadPoolImpl::Impl::BGThreadWrapper(void* arg) {
 
 void ThreadPoolImpl::Impl::SetBackgroundThreadsInternal(int num,
   bool allow_reduce) {
-  std::unique_lock<std::mutex> lock(mu_);
+  std::lock_guard<std::mutex> lock(mu_);
   if (exit_all_threads_) {
-    lock.unlock();
     return;
   }
   if (num > total_threads_limit_ ||