use String#clear for short-lived buffers we create

This should reduce memory pressure slightly as we can
have finer-grained control of memory usage for buffers which
can be several kilobytes large.

It is not safe to do this for output buffers we get from the
application, as they may reuse that memory themselves.

1 files changed, 4 insertions, 2 deletions

diff --git a/lib/yahns/http_response.rb b/lib/yahns/http_response.rb
index 292fab7..4b36db2 100644
--- a/lib/yahns/http_response.rb
+++ b/lib/yahns/http_response.rb
@@ -162,11 +162,13 @@ module Yahns::HttpResponse # :nodoc:
                     : "Connection: close\r\n\r\n".freeze)
       case rv = kgio_syssend(buf, flags)
       when nil # all done, likely
+        buf.clear
+        buf = nil # recycle any memory we used ASAP
         break
       when String
         flags = MSG_DONTWAIT
-        buf = rv # hope the skb grows
-      when :wait_writable, :wait_readable
+        buf = rv # unlikely, hope the skb grows
+      when :wait_writable, :wait_readable # unlikely
         if k.output_buffering
           alive = hijack ? hijack : alive
           rv = response_header_blocked(rv, buf, body, alive, offset, count)