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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
This commit is contained in:
风 2019-09-18 14:23:40 -07:00 committed by Facebook Github Bot
parent 6a279037cf
commit 2389aa2da9
1 changed files with 1 additions and 2 deletions
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3
util/threadpool_imp.cc
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@ -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_ ||