Queue False Sharing

Queue.h

//
//  Queue.cpp
//
//  Created by Joshua Waring on 1/06/2015.
//
//

#ifdef FALSE_SHARING_ALLOWED

template<typedef T>
class alignas(64) Queue{
    T* data_;
    size_t push_position_;
    size_t pop_position_;
    std::atomic<size_t> size_;
    size_t capacity_;
};

// Accounting for False Sharing
// To do this we'll break the memory into 3 cache lines,
// One for each of the two cores and one for data that must be shared

#else

template<typedef T>
class alignas(64) Queue{
    // Producers C-Line
    size_t push_position_;
    char pad_p[64 - sizeof(size_t)];
    // Consumors C-Line
    size_t pop_position_;
    char pad_c[64 - sizeof(size_t)];
    // Shared Read C-Line
    T* data_;
    size_t capacity_;
    char pad_sr[64 - sizeof(size_t) - sizeof(T*)];
    // Shared Write C-Line
    std::atomic<size_t> size_;
    char pad_sw[64 - sizeof(std::atomic<size_t>)];
};

#endif