bool store_conditional()

in src/ds/aba.h [97:118]

• 20 lines of code
• 6 McCabe index (conditional complexity)

      bool store_conditional(T* value)
      {
#  if defined(_MSC_VER) && defined(SNMALLOC_VA_BITS_64)
        auto result = _InterlockedCompareExchange128(
          (volatile __int64*)parent,
          (__int64)(old.aba + (uintptr_t)1),
          (__int64)address_cast(value),
          (__int64*)&old);
#  else
#    if defined(__GNUC__) && defined(SNMALLOC_VA_BITS_64) && \
      !defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_16)
#error You must compile with -mcx16 to enable 16-byte atomic compare and swap.
#    endif

        Linked xchg{value, old.aba + 1};
        std::atomic<Linked>& addr = parent->linked;

        auto result = addr.compare_exchange_weak(
          old, xchg, std::memory_order_acq_rel, std::memory_order_relaxed);
#  endif
        return result;
      }