+namespace {
+
+void flush_pending_data(int sock)
+{
+ // Flush pending data, which would otherwise wait for the 200ms TCP_CORK timer
+ // to elapsed; does not cancel out TCP_CORK (since that still takes priority),
+ // but does a one-off flush.
+ int one = 1;
+ if (setsockopt(sock, SOL_TCP, TCP_NODELAY, &one, sizeof(one)) == -1) {
+ log_perror("setsockopt(TCP_NODELAY)");
+ // Can still continue.
+ }
+}
+
+} // namespace
+