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diff --git a/src/key-value-store/hashtable/qtype.h b/src/key-value-store/hashtable/qtype.h
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+/******************************************************************************
+ * qLibc
+ *
+ * Copyright (c) 2010-2014 Seungyoung Kim.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+/**
+ * Defines basic object types that are commonly used in various containers.
+ *
+ * @file qtype.h
+ */
+
+#ifndef _QTYPE_H
+#define _QTYPE_H
+
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <pthread.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* types */
+typedef struct qmutex_s qmutex_t;    /*!< qlibc pthread mutex type*/
+typedef struct qobj_s qobj_t;        /*!< object type*/
+typedef struct qnobj_s qnobj_t;      /*!< named-object type*/
+typedef struct qdlobj_s qdlobj_t;    /*!< doubly-linked-object type*/
+typedef struct qdlnobj_s qdlnobj_t;  /*!< doubly-linked-named-object type*/
+typedef struct qhnobj_s qhnobj_t;    /*!< hashed-named-object type*/
+
+/**
+ * qlibc pthread mutex data structure.
+ */
+struct qmutex_s {
+    pthread_mutex_t mutex;  /*!< pthread mutex */
+    pthread_t owner;        /*!< mutex owner thread id */
+    int count;              /*!< recursive lock counter */
+};
+
+/**
+ * object data structure.
+ */
+struct qobj_s {
+    void *data;         /*!< data */
+    size_t size;        /*!< data size */
+    uint8_t type;       /*!< data type */
+};
+
+/**
+ * named-object data structure.
+ */
+struct qnobj_s {
+    char *name;         /*!< object name */
+    void *data;         /*!< data */
+    size_t size;        /*!< data size */
+};
+
+/**
+ * doubly-linked-object data structure.
+ */
+struct qdlobj_s {
+    void *data;         /*!< data */
+    size_t size;        /*!< data size */
+
+    qdlobj_t *prev;     /*!< previous link */
+    qdlobj_t *next;     /*!< next link */
+};
+
+/**
+ * doubly-linked-named-object data structure.
+ */
+struct qdlnobj_s {
+    uint32_t hash;      /*!< 32bit-hash value of object name */
+    char *name;         /*!< object name */
+    void *data;         /*!< data */
+    size_t size;        /*!< data size */
+
+    qdlnobj_t *prev;    /*!< previous link */
+    qdlnobj_t *next;    /*!< next link */
+};
+
+/**
+ * hashed-named-object data structure.
+ */
+struct qhnobj_s {
+    uint32_t hash;      /*!< 32bit-hash value of object name */
+    char *name;         /*!< object name */
+    void *data;         /*!< data */
+    size_t size;        /*!< data size */
+
+    qhnobj_t *next;     /*!< for chaining next collision object */
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*_QTYPE_H */
+