os: refactor/rewrite entire namespace.

libraries/libstratosphere/source/os/os_mutex.cpp

@@ -0,0 +1,160 @@
+/*
+ * 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>
+#include "impl/os_thread_manager.hpp"
+#include "impl/os_mutex_impl.hpp"
+
+namespace ams::os {
+
+    namespace impl {
+
+        #ifdef ATMOSPHERE_BUILD_FOR_AUDITING
+
+            void PushAndCheckLockLevel(MutexType *mutex) {
+                /* If auditing isn't specified, don't bother. */
+                if (mutex->lock_level == 0) {
+                    return;
+                }
+
+                /* TODO: Implement mutex level auditing. */
+            }
+
+            void PopAndCheckLockLevel(MutexType *mutex) {
+                /* If auditing isn't specified, don't bother. */
+                if (mutex->lock_level == 0) {
+                    return;
+                }
+
+                /* TODO: Implement mutex level auditing. */
+            }
+
+        #else
+
+            void PushAndCheckLockLevel(MutexType *mutex) {
+                /* ... */
+            }
+
+            void PopAndCheckLockLevel(MutexType *mutex) {
+                /* ... */
+            }
+
+        #endif
+
+    }
+
+    namespace {
+
+        ALWAYS_INLINE void AfterLockMutex(MutexType *mutex, ThreadType *cur_thread) {
+            AMS_ASSERT(mutex->nest_count < MutexRecursiveLockCountMax);
+
+            impl::PushAndCheckLockLevel(mutex);
+
+            ++mutex->nest_count;
+            mutex->owner_thread = cur_thread;
+        }
+
+    }
+
+    void InitializeMutex(MutexType *mutex, bool recursive, int lock_level) {
+        AMS_ASSERT((lock_level == 0) || (MutexLockLevelMin <= lock_level && lock_level <= MutexLockLevelMax));
+
+        /* Create object. */
+        new (GetPointer(mutex->_storage)) impl::InternalCriticalSection;
+
+        /* Set member variables. */
+        mutex->is_recursive = recursive;
+        mutex->lock_level   = lock_level;
+        mutex->nest_count   = 0;
+        mutex->owner_thread = nullptr;
+
+        /* Mark initialized. */
+        mutex->state = MutexType::State_Initialized;
+    }
+
+    void FinalizeMutex(MutexType *mutex) {
+        AMS_ASSERT(mutex->state == MutexType::State_Initialized);
+
+        /* Mark not intialized. */
+        mutex->state = MutexType::State_NotInitialized;
+
+        /* Destroy object. */
+        GetReference(mutex->_storage).~InternalCriticalSection();
+    }
+
+    void LockMutex(MutexType *mutex) {
+        AMS_ASSERT(mutex->state == MutexType::State_Initialized);
+
+        ThreadType *current = impl::GetCurrentThread();
+
+        if (!mutex->is_recursive) {
+            AMS_ASSERT(mutex->owner_thread != current);
+            GetReference(mutex->_storage).Enter();
+        } else {
+            if (mutex->owner_thread == current) {
+                AMS_ASSERT(mutex->nest_count >= 1);
+            } else {
+                GetReference(mutex->_storage).Enter();
+            }
+        }
+
+        AfterLockMutex(mutex, current);
+    }
+
+    bool TryLockMutex(MutexType *mutex) {
+        AMS_ASSERT(mutex->state == MutexType::State_Initialized);
+
+        ThreadType *current = impl::GetCurrentThread();
+
+        if (!mutex->is_recursive) {
+            AMS_ASSERT(mutex->owner_thread != current);
+            if (!GetReference(mutex->_storage).TryEnter()) {
+                return false;
+            }
+        } else {
+            if (mutex->owner_thread == current) {
+                AMS_ASSERT(mutex->nest_count >= 1);
+            } else {
+                if (!GetReference(mutex->_storage).TryEnter()) {
+                    return false;
+                }
+            }
+        }
+
+        AfterLockMutex(mutex, current);
+
+        return true;
+    }
+
+    void UnlockMutex(MutexType *mutex) {
+        AMS_ASSERT(mutex->state == MutexType::State_Initialized);
+        AMS_ASSERT(mutex->nest_count > 0);
+        AMS_ASSERT(mutex->owner_thread == impl::GetCurrentThread());
+
+        impl::PopAndCheckLockLevel(mutex);
+
+        if ((--mutex->nest_count) == 0) {
+            mutex->owner_thread = nullptr;
+            GetReference(mutex->_storage).Leave();
+        }
+    }
+
+    bool IsMutexLockedByCurrentThread(const MutexType *mutex) {
+        AMS_ASSERT(mutex->state == MutexType::State_Initialized);
+
+        return mutex->owner_thread == impl::GetCurrentThread();
+    }
+
+}