1 files changed, 35 insertions, 0 deletions

diff --git a/src/tracker.h b/src/tracker.h
new file mode 100644
index 0000000..087598c
--- /dev/null
+++ b/src/tracker.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <mutex>
+
+// Do we want to activate full lane tracking feature?
+#define HAVE_LANE_TRACKING() 1
+
+#if HAVE_LANE_TRACKING()
+
+class Lane;
+struct lua_State;
+
+// The chain is ended by '(Lane*)(-1)', not nullptr:
+// 'trackingFirst -> ... -> ... -> (-1)'
+#define TRACKING_END ((Lane*) (-1))
+
+class LaneTracker
+{
+    private:
+    mutable std::mutex trackingMutex;
+    Lane* volatile trackingFirst{ nullptr }; // will change to TRACKING_END if we want to activate tracking
+
+    public:
+    void tracking_add(Lane* lane_);
+    [[nodiscard]] bool tracking_remove(Lane* lane_);
+    [[nodiscard]] int pushThreadsTable(lua_State* L_) const;
+    void activate() {
+        trackingFirst = TRACKING_END;
+    }
+    [[nodiscard]] bool isActive() const {
+        return trackingFirst != nullptr;
+    }
+};
+
+#endif // HAVE_LANE_TRACKING()