+ /**
+ * Enable multi-threading (only effective on writing)
+ *
+ * @param fp BGZF file handler; must be opened for writing
+ * @param n_threads #threads used for writing
+ * @param n_sub_blks #blocks processed by each thread; a value 64-256 is recommended
+ */
+ int bgzf_mt(BGZF *fp, int n_threads, int n_sub_blks);
+