Try atomic

Signed-off-by: Larry Gritz <[email protected]>

src/libOpenImageIO/imageinput.cpp

@@ -38,17 +38,18 @@ static thread_local tsl::robin_map<const ImageInput*, std::string>
 // destroyed.
 class LiveStaticSentry {
 public:
-    LiveStaticSentry()
-        : m_alive(1)
-    {
-    }
+    LiveStaticSentry() { m_alive = 1; }
     ~LiveStaticSentry() { m_alive = 0; }
-    // int operator()() const { return m_alive; }
-    operator bool() const { return m_alive; }
-    bool alive() const { return m_alive; }
+    operator bool() const { return alive(); }
+    bool alive() const {
+        int a = m_alive;
+        // if (!a)
+        //     print("LiveStaticSentry::alive() called after static destruction\n");
+        return a;
+    }
 
 private:
-    int m_alive = 0;
+    atomic_int m_alive { 0 };
 };
 
 static LiveStaticSentry statics_alive;