1 files changed, 81 insertions, 0 deletions
diff --git a/native/jni/src/utils/exclusive_ownership_pointer.h b/native/jni/src/utils/exclusive_ownership_pointer.h
new file mode 100644
index 000000000..081802e8b
--- /dev/null
+++ b/native/jni/src/utils/exclusive_ownership_pointer.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_EXCLUSIVE_OWNERSHIP_POINTER_H
+#define LATINIME_EXCLUSIVE_OWNERSHIP_POINTER_H
+
+#include "defines.h"
+
+namespace latinime {
+
+template<class T>
+class ExclusiveOwnershipPointer {
+ public:
+    // This instance become an owner of the raw pointer.
+    AK_FORCE_INLINE ExclusiveOwnershipPointer(T *const rawPointer)
+            : mPointer(rawPointer),
+              mSharedOwnerPtr(new (ExclusiveOwnershipPointer<T> *)(this)) {}
+
+    // Move the ownership.
+    AK_FORCE_INLINE ExclusiveOwnershipPointer(const ExclusiveOwnershipPointer<T> &pointer)
+            : mPointer(pointer.mPointer), mSharedOwnerPtr(pointer.mSharedOwnerPtr) {
+        transferOwnership(&pointer);
+    }
+
+    AK_FORCE_INLINE ~ExclusiveOwnershipPointer() {
+        deletePointersIfHavingOwnership();
+    }
+
+    AK_FORCE_INLINE T *get() const {
+        return mPointer;
+    }
+
+ private:
+    // This class allows to copy and ensures only one instance has the ownership of the
+    // managed pointer.
+    DISALLOW_DEFAULT_CONSTRUCTOR(ExclusiveOwnershipPointer);
+    DISALLOW_ASSIGNMENT_OPERATOR(ExclusiveOwnershipPointer);
+
+    void transferOwnership(const ExclusiveOwnershipPointer<T> *const src) {
+        if (*mSharedOwnerPtr != src) {
+           AKLOGE("Failed to transfer the ownership because src is not the current owner."
+                   "src: %p, owner: %p", src, *mSharedOwnerPtr);
+           ASSERT(false);
+           return;
+        }
+        // Transfer the ownership from src to this instance.
+        *mSharedOwnerPtr = this;
+    }
+
+    void deletePointersIfHavingOwnership() {
+        if (mSharedOwnerPtr && *mSharedOwnerPtr == this) {
+            if (mPointer) {
+                if (DEBUG_DICT) {
+                    AKLOGI("Releasing pointer: %p", mPointer);
+                }
+                delete mPointer;
+            }
+            delete mSharedOwnerPtr;
+        }
+    }
+
+    T *mPointer;
+    // mSharedOwnerPtr points a shared memory space where the instance which has the ownership is
+    // stored.
+    ExclusiveOwnershipPointer<T> **mSharedOwnerPtr;
+};
+} // namespace latinime
+#endif /* LATINIME_EXCLUSIVE_OWNERSHIP_POINTER_H */