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      1 /*
      2  * Copyright 2015 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "SkSpinlock.h"
      9 
     10 void SkPODSpinlock::contendedAcquire() {
     11     // To act as a mutex, we need an acquire barrier when we take the lock.
     12     while(sk_atomic_exchange(&fLocked, true, sk_memory_order_acquire)) { /*spin*/ }
     13 }
     14