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-rw-r--r--cpp/src/Glacier2/FilterI.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/cpp/src/Glacier2/FilterI.h b/cpp/src/Glacier2/FilterI.h
index 2dbacdbfe62..0ec5fe2e2f3 100644
--- a/cpp/src/Glacier2/FilterI.h
+++ b/cpp/src/Glacier2/FilterI.h
@@ -62,6 +62,7 @@ public:
bool
empty() const
{
+ IceUtil::Monitor<IceUtil::Mutex>::Lock lock(*this);
return _items.size() == 0;
}