MultiFinalProject/htm_cas.h at master · yonihorn/MultiFinalProject · GitHub

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#include <immintrin.h>
#include <cstring>
typedef unsigned int u_int;

template <class T>
inline bool htm_compare_and_swap(T* obj, T* expected, T desired) {
    unsigned status;
    if (status = _xbegin() == _XBEGIN_STARTED) {
        if (std::memcmp(obj, expected, sizeof(T)) == 0) {
            std::memcpy(obj, &desired, sizeof(T));
            _xend();
            return true;
        } else {
            _xend();
        }

    }
    return false;
}

template<>
inline bool htm_compare_and_swap<u_int>(u_int* obj, u_int* expected, u_int desired) {
    unsigned status;
    if (status = _xbegin() == _XBEGIN_STARTED) {
        if (*obj == *expected) {
            *obj = desired;
            _xend();
            return true;
        } else {
            _xend();
        }
    }
    return false;
}