/*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkSpinlock_DEFINED
#define SkSpinlock_DEFINED

#include <atomic>

class SkSpinlock {
public:
    void acquire() {
        // To act as a mutex, we need an acquire barrier when we acquire the lock.
        if (fLocked.exchange(true, std::memory_order_acquire)) {
            // Lock was contended.  Fall back to an out-of-line spin loop.
            this->contendedAcquire();
        }
    }

    void release() {
        // To act as a mutex, we need a release barrier when we release the lock.
        fLocked.store(false, std::memory_order_release);
    }

private:
    void contendedAcquire();

    std::atomic<bool> fLocked{false};
};

#endif//SkSpinlock_DEFINED

/*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkSpinlock_DEFINED
#define SkSpinlock_DEFINED

#include "SkTypes.h"
#include <atomic>

class SkSpinlock {
public:
    void acquire() {
        // To act as a mutex, we need an acquire barrier when we acquire the lock.
        if (fLocked.exchange(true, std::memory_order_acquire)) {
            // Lock was contended.  Fall back to an out-of-line spin loop.
            this->contendedAcquire();
        }
    }

    void release() {
        // To act as a mutex, we need a release barrier when we release the lock.
        fLocked.store(false, std::memory_order_release);
    }

private:
    SK_API void contendedAcquire();

    std::atomic<bool> fLocked{false};
};

#endif//SkSpinlock_DEFINED

Make Cmake work with debug build
Make Cmake work with debug build

Before this CL, the following failed to link:

    cd .../skia
    git fetch
    git checkout origin/master
    git clean -ffdx
    SKIA="$PWD"
    cd $(mktemp -d);
    cmake "${SKIA}/cmake" -DCMAKE_BUILD_TYPE=Debug -G Ninja
    ninja
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1757993006

Review URL: https://codereview.chromium.org/1757993006
