os: implement SdkRecursiveMutex

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

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2018-2020 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 <vapours.hpp>
+#include <stratosphere/os/impl/os_internal_critical_section.hpp>
+
+namespace ams::os {
+
+    class SdkConditionVariable;
+
+    struct SdkRecursiveMutexType {
+        union {
+            s32 _arr[sizeof(impl::InternalCriticalSectionStorage) / sizeof(s32)];
+            impl::InternalCriticalSectionStorage _storage;
+        };
+        u32 recursive_count;
+    };
+    static_assert(std::is_trivial<SdkRecursiveMutexType>::value);
+
+    void InitializeSdkRecursiveMutex(SdkRecursiveMutexType *rmutex);
+
+    void LockSdkRecursiveMutex(SdkRecursiveMutexType *rmutex);
+    bool TryLockSdkRecursiveMutex(SdkRecursiveMutexType *rmutex);
+    void UnlockSdkRecursiveMutex(SdkRecursiveMutexType *rmutex);
+
+    bool IsSdkRecursiveMutexLockedByCurrentThread(const SdkRecursiveMutexType *rmutex);
+
+    class SdkRecursiveMutex {
+        private:
+            friend class SdkConditionVariable;
+        private:
+            SdkRecursiveMutexType m_mutex;
+        public:
+            constexpr SdkRecursiveMutex() : m_mutex{{0}, 0} { /* ... */ }
+
+            ALWAYS_INLINE void Lock()    { return os::LockSdkRecursiveMutex(std::addressof(m_mutex)); }
+            ALWAYS_INLINE bool TryLock() { return os::TryLockSdkRecursiveMutex(std::addressof(m_mutex)); }
+            ALWAYS_INLINE void Unlock()  { return os::UnlockSdkRecursiveMutex(std::addressof(m_mutex)); }
+
+            ALWAYS_INLINE bool IsLockedByCurrentThread() const { return os::IsSdkRecursiveMutexLockedByCurrentThread(std::addressof(m_mutex)); }
+
+            ALWAYS_INLINE void lock()     { return this->Lock(); }
+            ALWAYS_INLINE bool try_lock() { return this->TryLock(); }
+            ALWAYS_INLINE void unlock()   { return this->Unlock(); }
+    };
+
+}