Move cps files into cps/

include/spinscale/cps/asynchronousContinuationChainLink.h

@@ -0,0 +1,43 @@
+#ifndef ASYNCHRONOUS_CONTINUATION_CHAIN_LINK_H
+#define ASYNCHRONOUS_CONTINUATION_CHAIN_LINK_H
+
+#include <functional>
+#include <memory>
+#include <optional>
+#include <vector>
+#include <spinscale/lockSet.h>
+
+namespace sscl {
+
+/**
+ * @brief Base class for all asynchronous continuation chain links
+ *
+ * This non-template base class provides type erasure for the continuation
+ * chain, allowing RTTI and dynamic casting when walking the chain.
+ *
+ * The chain walking logic can use dynamic_cast to determine the most
+ * derived type and perform appropriate operations.
+ *
+ * Inherits from enable_shared_from_this to allow objects to obtain a
+ * shared_ptr to themselves, which is useful for gridlock detection tracking.
+ */
+class AsynchronousContinuationChainLink
+:	public std::enable_shared_from_this<AsynchronousContinuationChainLink>
+{
+public:
+	virtual ~AsynchronousContinuationChainLink() = default;
+
+	virtual std::shared_ptr<AsynchronousContinuationChainLink>
+	getCallersContinuationShPtr() const = 0;
+
+	virtual std::optional<std::reference_wrapper<const LockSet>>
+	getLockSet() const
+		{ return std::nullopt; }
+
+	virtual std::optional<std::reference_wrapper<LockSet>> getLockSet()
+		{ return std::nullopt; }
+};
+
+} // namespace sscl
+
+#endif // ASYNCHRONOUS_CONTINUATION_CHAIN_LINK_H