From a47e9b9fcb911efa0ce073d4ad613c89788c65a5 Mon Sep 17 00:00:00 2001
From: Daniel Alm <Daniel.Alm@ForumD.net>
Date: Sat, 21 Apr 2018 12:17:22 +0200
Subject: [PATCH] Fix a memory leak in QueueHandler

`QueueHandler` sometimes retains the context it is executing on in `waitingCtx`. That context's handler is the `QueueHandler` itself, leading to a retain cycle. We break it by making `waitingCtx` a weak reference.
---
 Sources/Async/QueueHandler.swift | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Sources/Async/QueueHandler.swift b/Sources/Async/QueueHandler.swift
index 2b89a07d..2e0221a8 100644
--- a/Sources/Async/QueueHandler.swift
+++ b/Sources/Async/QueueHandler.swift
@@ -27,7 +27,7 @@ public final class QueueHandler<In, Out>: ChannelInboundHandler {
     private let eventLoop: EventLoop
 
     /// A write-ready context waiting.
-    private var waitingCtx: ChannelHandlerContext?
+    private weak var waitingCtx: ChannelHandlerContext?
 
     /// Handles errors that happen when no input promise is waiting.
     private var errorHandler: (Error) -> ()