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_rw_lock.hpp

@@ -0,0 +1,89 @@
+/*
+ * 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 ReadWriteLock {
+        NON_COPYABLE(ReadWriteLock);
+        NON_MOVEABLE(ReadWriteLock);
+        private:
+            ::RwLock r;
+        public:
+            ReadWriteLock() {
+                rwlockInit(&this->r);
+            }
+
+            bool IsWriteLockHeldByCurrentThread() const {
+                return rwlockIsWriteLockHeldByCurrentThread(const_cast<::RwLock *>(&this->r));
+            }
+
+            bool IsLockOwner() const {
+                return rwlockIsOwnedByCurrentThread(const_cast<::RwLock *>(&this->r));
+            }
+
+            void AcquireReadLock() {
+                rwlockReadLock(&this->r);
+            }
+
+            void ReleaseReadLock() {
+                rwlockReadUnlock(&this->r);
+            }
+
+            bool TryAcquireReadLock() {
+                return rwlockTryReadLock(&this->r);
+            }
+
+            void AcquireWriteLock() {
+                rwlockWriteLock(&this->r);
+            }
+
+            void ReleaseWriteLock() {
+                rwlockWriteUnlock(&this->r);
+            }
+
+            bool TryAcquireWriteLock() {
+                return rwlockTryWriteLock(&this->r);
+            }
+
+            void lock_shared() {
+                this->AcquireReadLock();
+            }
+
+            void unlock_shared() {
+                this->ReleaseReadLock();
+            }
+
+            bool try_lock_shared() {
+                return this->TryAcquireReadLock();
+            }
+
+            void lock() {
+                this->AcquireWriteLock();
+            }
+
+            void unlock() {
+                this->ReleaseWriteLock();
+            }
+
+            bool try_lock() {
+                return this->TryAcquireWriteLock();
+            }
+    };
+
+}