From a167217ee60a01235bf29792a46a4e8645a7835e Mon Sep 17 00:00:00 2001
From: Mattt Thompson <m@mattt.me>
Date: Wed, 31 Aug 2011 09:59:34 -0500
Subject: [PATCH] Wrapping network thread lazy initializer with dispatch_once,
 to ensure thread safety

---
 AFNetworking/AFHTTPRequestOperation.m | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/AFNetworking/AFHTTPRequestOperation.m b/AFNetworking/AFHTTPRequestOperation.m
index 1ad535c..23695cb 100644
--- a/AFNetworking/AFHTTPRequestOperation.m
+++ b/AFNetworking/AFHTTPRequestOperation.m
@@ -108,10 +108,12 @@ static inline BOOL AFHTTPOperationStateTransitionIsValid(AFHTTPOperationState fr
 static NSThread *_networkRequestThread = nil;
 
 + (NSThread *)networkRequestThread {
-    if (!_networkRequestThread) {
+    static dispatch_once_t oncePredicate;
+    
+    dispatch_once(&oncePredicate, ^{
         _networkRequestThread = [[NSThread alloc] initWithTarget:self selector:@selector(networkRequestThreadEntryPoint:) object:nil];
         [_networkRequestThread start];
-    }
+    });
         
     return _networkRequestThread;
 }