From 5f0665f8c87ad1abc948a8cb61088cb5ceec83ed Mon Sep 17 00:00:00 2001
From: Niklas Keller <me@kelunik.com>
Date: Wed, 11 Oct 2017 09:50:27 +0200
Subject: [PATCH] Optimize memory consumption of Amp\ByteStream\pipe

---
 lib/functions.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/functions.php b/lib/functions.php
index 1b8b973..d630c07 100644
--- a/lib/functions.php
+++ b/lib/functions.php
@@ -24,7 +24,9 @@ function pipe(InputStream $source, OutputStream $destination): Promise {
 
         while (($chunk = yield $source->read()) !== null) {
             $written += \strlen($chunk);
-            yield $destination->write($chunk);
+            $writePromise = $destination->write($chunk);
+            $chunk = null; // free memory
+            yield $writePromise;
         }
 
         return $written;