From 7e96b776ca62aada629650b0db98fb36117779bb Mon Sep 17 00:00:00 2001
From: DreamPiggy <lizhuoli1126@126.com>
Date: Sun, 28 Jan 2018 19:06:46 +0800
Subject: [PATCH] Fix the issue that prefetcher will cause stack overflow is
 the input urls list is huge because of recursion function call

---
 SDWebImage/SDWebImagePrefetcher.m | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/SDWebImage/SDWebImagePrefetcher.m b/SDWebImage/SDWebImagePrefetcher.m
index cabf132d..18c433e7 100644
--- a/SDWebImage/SDWebImagePrefetcher.m
+++ b/SDWebImage/SDWebImagePrefetcher.m
@@ -80,7 +80,8 @@
              ];
         }
         if (self.prefetchURLs.count > self.requestedCount) {
-            dispatch_queue_async_safe(self.prefetcherQueue, ^{
+            dispatch_async(self.prefetcherQueue, ^{
+                // we need dispatch to avoid function recursion call. This can prevent stack overflow even for huge urls list
                 [self startPrefetchingAtIndex:self.requestedCount];
             });
         } else if (self.finishedCount == self.requestedCount) {