meso: Implement KObjectRegistry

mesosphere/include/mesosphere/core/KLinkedList.hpp

@@ -389,6 +389,18 @@ class KLinkedList final {
         return nd->data;
     }
 
+    template< class... Args>
+    T *emplace_back_or_fail(Args&&... args)
+    {
+        auto *nd = new typename List::Node{std::forward<Args>(args)...};
+        if (nd != nullptr) {
+            insert_node_after(list.last(), &nd->link);
+            return &nd->data;
+        } else {
+            return nullptr;
+        }
+    }
+
     void pop_back()
     {
         auto *nd = list.last();

mesosphere/include/mesosphere/core/KObjectRegistry.hpp

@@ -0,0 +1,43 @@
+#pragma once
+
+#include <mesosphere/core/KAutoObject.hpp>
+#include <mesosphere/core/KLinkedList.hpp>
+#include <mesosphere/core/Result.hpp>
+#include <mesosphere/threading/KMutex.hpp>
+#include <cstring>
+
+namespace mesosphere
+{
+
+class KObjectRegistry {
+    public:
+
+    static KObjectRegistry &GetInstance() { return instance; }
+
+    SharedPtr<KAutoObject> Find(const char *name) const;
+    Result Register(SharedPtr<KAutoObject> obj, const char *name);
+    Result Unregister(const char *name);
+
+    private:
+
+    struct Node {
+        SharedPtr<KAutoObject> obj{};
+        char name[12] = {0};
+
+        Node() = default;
+        Node(SharedPtr<KAutoObject> &&obj, const char *name) : obj{obj}
+        {
+            std::strncpy(this->name, name, sizeof(this->name));
+        }
+    };
+
+    const Node *FindImpl(const char *name) const;
+    Node *FindImpl(const char *name);
+
+    KLinkedList<Node> nameNodes{};
+    mutable KMutex mutex{};
+
+    static KObjectRegistry instance;
+};
+
+}