+/**
+ * Usage function typedef used by the application usage function.
+ *
+ * Use this function typedef to define and call rte_set_applcation_usage_hook()
+ * routine.
+ */
+typedef void (*rte_usage_hook_t)(const char * prgname);
+
+/**
+ * Add application usage routine callout from the eal_usage() routine.
+ *
+ * This function allows the application to include its usage message
+ * in the EAL system usage message. The routine rte_set_application_usage_hook()
+ * needs to be called before the rte_eal_init() routine in the application.
+ *
+ * This routine is optional for the application and will behave as if the set
+ * routine was never called as the default behavior.
+ *
+ * @param func
+ * The func argument is a function pointer to the application usage routine.
+ * Called function is defined using rte_usage_hook_t typedef, which is of
+ * the form void rte_usage_func(const char * prgname).
+ *
+ * Calling this routine with a NULL value will reset the usage hook routine and
+ * return the current value, which could be NULL.
+ * @return
+ * - Returns the current value of the rte_application_usage pointer to allow
+ * the caller to daisy chain the usage routines if needing more then one.
+ */
+rte_usage_hook_t
+rte_set_application_usage_hook( rte_usage_hook_t usage_func );
+
+/**
+ * macro to get the lock of tailq in mem_config
+ */
+#define RTE_EAL_TAILQ_RWLOCK (&rte_eal_get_configuration()->mem_config->qlock)
+
+/**
+ * macro to get the multiple lock of mempool shared by mutiple-instance
+ */
+#define RTE_EAL_MEMPOOL_RWLOCK (&rte_eal_get_configuration()->mem_config->mplock)
+
+
+/**
+ * Utility macro to do a thread-safe tailq 'INSERT' of rte_mem_config
+ *
+ * @param idx
+ * a kind of tailq define in enum rte_tailq_t
+ *
+ * @param type
+ * type of list(tailq head)
+ *
+ * @param elm
+ * The element will be added into the list
+ *
+ */
+#define RTE_EAL_TAILQ_INSERT_TAIL(idx, type, elm) do { \
+ struct type *list; \
+ list = RTE_TAILQ_LOOKUP_BY_IDX(idx, type); \
+ rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK); \
+ TAILQ_INSERT_TAIL(list, elm, next); \
+ rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK); \
+} while (0)
+
+/**
+ * Utility macro to do a thread-safe tailq 'REMOVE' of rte_mem_config
+ *
+ * @param idx
+ * a kind of tailq define in enum rte_tailq_t
+ *
+ * @param type
+ * type of list(tailq head)
+ *
+ * @param elm
+ * The element will be remove from the list
+ *
+ */
+#define RTE_EAL_TAILQ_REMOVE(idx, type, elm) do { \
+ struct type *list; \
+ list = RTE_TAILQ_LOOKUP_BY_IDX(idx, type); \
+ rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK); \
+ TAILQ_REMOVE(list, elm, next); \
+ rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK); \
+} while (0) \
+
+
+/**
+ * macro to check TAILQ exist
+ *
+ * @param idx
+ * a kind of tailq define in enum rte_tailq_t
+ *
+ */
+#define RTE_EAL_TAILQ_EXIST_CHECK(idx) do { \
+ if (RTE_TAILQ_LOOKUP_BY_IDX(idx, rte_tailq_head) == NULL){ \
+ rte_errno = E_RTE_NO_TAILQ; \
+ return NULL; \
+ } \
+} while(0)
+
+/**
+ * Whether EAL is using huge pages (disabled by --no-huge option).
+ * The no-huge mode cannot be used with UIO poll-mode drivers like igb/ixgbe.
+ * It is useful for NIC drivers (e.g. librte_pmd_mlx4, librte_pmd_vmxnet3) or
+ * crypto drivers (e.g. librte_crypto_nitrox) provided by third-parties such
+ * as 6WIND.
+ *
+ * @return
+ * Nonzero if hugepages are enabled.
+ */
+int rte_eal_has_hugepages(void);