[llvm] r319027 - [Support] Fix locking of shared variable in threadpool

[Jan Korous via llvm-commits]

Author: jkorous
Date: Mon Nov 27 05:42:03 2017
New Revision: 319027

URL: http://llvm.org/viewvc/llvm-project?rev=319027&view=rev
Log:
[Support] Fix locking of shared variable in threadpool

Modified:
    llvm/trunk/lib/Support/ThreadPool.cpp

Modified: llvm/trunk/lib/Support/ThreadPool.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/ThreadPool.cpp?rev=319027&r1=319026&r2=319027&view=diff
==============================================================================
--- llvm/trunk/lib/Support/ThreadPool.cpp (original)
+++ llvm/trunk/lib/Support/ThreadPool.cpp Mon Nov 27 05:42:03 2017
@@ -47,8 +47,8 @@ ThreadPool::ThreadPool(unsigned ThreadCo
           // 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();