+/**
+ * Sleep after writing to limit I/O bandwidth usage.
+ *
+ * @todo Rather than sleeping after each write, it might be better to
+ * use some kind of averaging. The current algorithm seems to always
+ * use a bit less bandwidth than specified, because it doesn't make up
+ * for slow periods. But arguably this is a feature. In addition, we
+ * ought to take the time used to write the data into account.
+ **/
+static void sleep_for_bwlimit(int bytes_written)
+{
+ struct timeval tv;
+
+ if (!bwlimit)
+ return;
+
+ assert(bytes_written > 0);
+ assert(bwlimit > 0);
+
+ tv.tv_usec = bytes_written * 1000 / bwlimit;
+ tv.tv_sec = tv.tv_usec / 1000000;
+ tv.tv_usec = tv.tv_usec % 1000000;
+
+ select(0, NULL, NULL, NULL, &tv);
+}
+
+