pgl: Reimplement the pgl sysmodule (#896)

* pgl: add skeleton folder to stratosphere

* pgl: Add service interface for IShellInterface

* pgl: begin skeletoning shell service, implement two commands.

* pgl: Implement three more commands.

* pgl: implement bool tracking commands

* pgl: Implement TriggerApplicationSnapShotDumper

* pgl: implement InitializeProcessControlTask

* pgl: Implement pgl::srv::Initialize

* pgl: Implement main()

* pgl: Implement (Get)ShellEventObserver

* pgl: implement LaunchProgramFromHost, GetHostContentMetaInfo

* pgl: Implement ProcessControlTask

* settings: fix duplicate object name

* pgl: fix minor bugs in impl

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

@@ -0,0 +1,60 @@
+/*
+ * 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 SdkMutexType {
+        union {
+            s32 _arr[sizeof(impl::InternalCriticalSectionStorage) / sizeof(s32)];
+            impl::InternalCriticalSectionStorage _storage;
+        };
+    };
+    static_assert(std::is_trivial<SdkMutexType>::value);
+
+    void InitializeSdkMutex(SdkMutexType *mutex);
+
+    void LockSdkMutex(SdkMutexType *mutex);
+    bool TryLockSdkMutex(SdkMutexType *mutex);
+    void UnlockSdkMutex(SdkMutexType *mutex);
+
+    bool IsSdkMutexLockedByCurrentThread(const SdkMutexType *mutex);
+
+    class SdkMutex {
+        private:
+            friend class SdkConditionVariable;
+        private:
+            SdkMutexType mutex;
+        public:
+            constexpr SdkMutex() : mutex{{0}} { /* ... */ }
+
+            ALWAYS_INLINE void Lock()    { return os::LockSdkMutex(std::addressof(this->mutex)); }
+            ALWAYS_INLINE bool TryLock() { return os::TryLockSdkMutex(std::addressof(this->mutex)); }
+            ALWAYS_INLINE void Unlock()  { return os::UnlockSdkMutex(std::addressof(this->mutex)); }
+
+            ALWAYS_INLINE bool IsLockedByCurrentThread() const { return os::IsSdkMutexLockedByCurrentThread(std::addressof(this->mutex)); }
+
+            ALWAYS_INLINE void lock()     { return this->Lock(); }
+            ALWAYS_INLINE bool try_lock() { return this->TryLock(); }
+            ALWAYS_INLINE void unlock()   { return this->Unlock(); }
+    };
+
+}