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 *
 * \param handle handle to the KVStore
 * \param barrier_before_exit whether to do barrier when kvstore finalize
 * \return 0 when success, -1 when failure happens
 */
int MXKVStoreSetBarrierBeforeExit(KVStoreHandle handle,
                                            const int barrier_before_exit);

/**
 * \brief the prototype of a server controller
 * \param head the head of the command
 * \param body the body of the command
 * \param controller_handle helper handle for implementing controller
 */
typedef void (MXKVStoreServerController)(int head,
                                         const char *body,
                                         void *controller_handle);

/**
 * \return Run as server (or scheduler)
 *
 * \param handle handle to the KVStore
 * \param controller the user-defined server controller
 * \param controller_handle helper handle for implementing controller
 * \return 0 when success, -1 when failure happens
 */
int MXKVStoreRunServer(KVStoreHandle handle,
                                 MXKVStoreServerController controller,
                                 void *callback_handle);

/**
 * \return Send a command to all server nodes
 *
 * \param handle handle to the KVStore
 * \param cmd_id the head of the command
 * \param cmd_body the body of the command
 * \return 0 when success, -1 when failure happens
 */
int MXKVStoreSendCommmandToServers(KVStoreHandle handle,
                                             int cmd_id,
                                             const char* cmd_body);

/**
 * \brief Get the number of ps dead node(s) specified by {node_id}
 *
 * \param handle handle to the KVStore