Use atomic operations when accessing statistics, and make the lazy initialization of statistics actually threadsafe.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74005 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/Statistic.cpp b/lib/Support/Statistic.cpp
index 6c652f8..33570b0 100644
--- a/lib/Support/Statistic.cpp
+++ b/lib/Support/Statistic.cpp
@@ -66,10 +66,14 @@
// If stats are enabled, inform StatInfo that this statistic should be
// printed.
sys::ScopedLock Writer(&*StatLock);
- if (Enabled)
- StatInfo->addStatistic(this);
- // Remember we have been registered.
- Initialized = true;
+ if (!Initialized) {
+ if (Enabled)
+ StatInfo->addStatistic(this);
+
+ sys::MemoryFence();
+ // Remember we have been registered.
+ Initialized = true;
+ }
}
namespace {