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/source/os/os_sdk_mutex.cpp

@@ -0,0 +1,43 @@
+/*
+ * 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/>.
+ */
+#include <stratosphere.hpp>
+
+namespace ams::os {
+
+    void InitializeSdkMutex(SdkMutexType *mutex) {
+        GetReference(mutex->_storage).Initialize();
+    }
+
+    bool IsSdkMutexLockedByCurrentThread(const SdkMutexType *mutex) {
+        return GetReference(mutex->_storage).IsLockedByCurrentThread();
+    }
+
+    void LockSdkMutex(SdkMutexType *mutex) {
+        AMS_ABORT_UNLESS(!IsSdkMutexLockedByCurrentThread(mutex));
+        return GetReference(mutex->_storage).Enter();
+    }
+
+    bool TryLockSdkMutex(SdkMutexType *mutex) {
+        AMS_ABORT_UNLESS(!IsSdkMutexLockedByCurrentThread(mutex));
+        return GetReference(mutex->_storage).TryEnter();
+    }
+
+    void UnlockSdkMutex(SdkMutexType *mutex) {
+        AMS_ABORT_UNLESS(IsSdkMutexLockedByCurrentThread(mutex));
+        return GetReference(mutex->_storage).Leave();
+    }
+
+}