git subrepo clone https://github.com/Atmosphere-NX/Atmosphere-libs libraries

subrepo:
  subdir:   "libraries"
  merged:   "07af583b"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "07af583b"
git-subrepo:
  version:  "0.4.0"
  origin:   "https://github.com/ingydotnet/git-subrepo"
  commit:   "5d6aba9"

libraries/libstratosphere/include/stratosphere/os/os_waitable_holder.hpp

@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2018-2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include "os_common_types.hpp"
+
+namespace ams::os {
+
+    class WaitableManager;
+
+    class Event;
+    class SystemEvent;
+    class InterruptEvent;
+    class Thread;
+    class MessageQueue;
+    class Semaphore;
+
+    namespace impl {
+
+        class WaitableHolderImpl;
+
+    }
+
+    class WaitableHolder {
+        friend class WaitableManager;
+        NON_COPYABLE(WaitableHolder);
+        NON_MOVEABLE(WaitableHolder);
+        private:
+            util::TypedStorage<impl::WaitableHolderImpl, 2 * sizeof(util::IntrusiveListNode) + 3 * sizeof(void *), alignof(void *)> impl_storage;
+            uintptr_t user_data;
+        public:
+            static constexpr size_t ImplStorageSize = sizeof(impl_storage);
+        public:
+            WaitableHolder(Handle handle);
+            WaitableHolder(Event *event);
+            WaitableHolder(SystemEvent *event);
+            WaitableHolder(InterruptEvent *event);
+            WaitableHolder(Thread *thread);
+            WaitableHolder(Semaphore *semaphore);
+            WaitableHolder(MessageQueue *message_queue, MessageQueueWaitKind wait_kind);
+
+            ~WaitableHolder();
+
+            void SetUserData(uintptr_t data) {
+                this->user_data = data;
+            }
+
+            uintptr_t GetUserData() const {
+                return this->user_data;
+            }
+
+            void UnlinkFromWaitableManager();
+    };
+
+}