Stratosphere: Add IWaitable, WaitableManager

stratosphere/loader/source/iwaitable.hpp

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <switch.h>
+
+class IWaitable {
+    u64 wait_priority = 0;
+    IWaitable *parent_waitable;
+    public:
+        virtual ~IWaitable();
+        virtual unsigned int get_num_waitables() = 0;
+        virtual void get_waitables(IWaitable **dst) = 0;
+        virtual void delete_child(IWaitable *child) = 0;
+        virtual Handle get_handle() = 0;
+        virtual Result handle_signaled() = 0;
+        
+        bool has_parent() {
+            return this->parent_waitable != NULL;
+        }
+        
+        IWaitable *get_parent() {
+            return this->parent_waitable;
+        }
+        
+        void update_priority() {
+            static u64 g_cur_priority = 0;
+            this->wait_priority = g_cur_priority++;
+        }
+        
+        static bool compare(IWaitable *a, IWaitable *b) {
+            return (a->wait_priority < b->wait_priority);
+        }
+};