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diff --git a/iOS/Pods/Kingfisher/Sources/ThreadHelper.swift b/iOS/Pods/Kingfisher/Sources/ThreadHelper.swift
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+//
+//  ThreadHelper.swift
+//  Kingfisher
+//
+//  Created by Wei Wang on 15/10/9.
+//
+//  Copyright (c) 2018 Wei Wang <onevcat@gmail.com>
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+import Foundation
+
+extension DispatchQueue {
+    // This method will dispatch the `block` to self.
+    // If `self` is the main queue, and current thread is main thread, the block
+    // will be invoked immediately instead of being dispatched.
+    func safeAsync(_ block: @escaping ()->()) {
+        if self === DispatchQueue.main && Thread.isMainThread {
+            block()
+        } else {
+            async { block() }
+        }
+    }
+}