From: Jan Korous <jkorous@apple.com>
Date: Mon, 27 Nov 2017 13:42:03 +0000 (+0000)
Subject: [Support] Fix locking of shared variable in threadpool
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=0c9555a244e4aeea5f434856a18899f6e7980852;p=llvm

[Support] Fix locking of shared variable in threadpool

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319027 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Support/ThreadPool.cpp b/lib/Support/ThreadPool.cpp
index f1b5bdf40c3..d0212ca1346 100644
--- a/lib/Support/ThreadPool.cpp
+++ b/lib/Support/ThreadPool.cpp
@@ -47,8 +47,8 @@ ThreadPool::ThreadPool(unsigned ThreadCount)
           // in order for wait() to properly detect that even if the queue is
           // empty, there is still a task in flight.
           {
-            ++ActiveThreads;
             std::unique_lock<std::mutex> LockGuard(CompletionLock);
+            ++ActiveThreads;
           }
           Task = std::move(Tasks.front());
           Tasks.pop();