/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkSpinlock.h"
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#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
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#include <emmintrin.h>
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static void pause() { _mm_pause(); }
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#else
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static void pause() { /*spin*/ }
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#endif
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void SkSpinlock::contendedAcquire() {
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// To act as a mutex, we need an acquire barrier when we acquire the lock.
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while (fLocked.exchange(true, std::memory_order_acquire)) {
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pause();
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}
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}
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