+/* FastIO on recyclable growing buffers */
+
+struct fastbuf *fbgrow_create(unsigned basic_size);
+void fbgrow_reset(struct fastbuf *b); /* Reset stream and prepare for writing */
+void fbgrow_rewind(struct fastbuf *b); /* Prepare for reading */
+
+/* FastO with atomic writes for multi-threaded programs */
+
+struct fb_atomic {
+ struct fastbuf fb;
+ struct fb_atomic_file *af;
+ byte *expected_max_bptr;
+ uns slack_size;
+};
+#define FB_ATOMIC(f) ((struct fb_atomic *)(f)->is_fastbuf)
+
+struct fastbuf *fbatomic_open(byte *name, struct fastbuf *master, uns bufsize, int record_len);
+void fbatomic_internal_write(struct fastbuf *b);
+
+static inline void
+fbatomic_commit(struct fastbuf *b)
+{
+ if (b->bptr >= ((struct fb_atomic *)b)->expected_max_bptr)
+ fbatomic_internal_write(b);
+}
+