Win32 C ++：获取进程CPU关联性？

Question

I need to query the CPU affinity of my program and find how many CPUs from the total number of CPUs available to the system are assigned to it.

std::thread::hardware_concurrency() returns a value that doesn't reflect affinity. Is there a (fast) way to query process affinity?

Answer 1

Seems like this is working:

int getAffinityCount()
{
    DWORD64 dwProcessAffinity, dwSystemAffinity;
    GetProcessAffinityMask(GetCurrentProcess(), &dwProcessAffinity, &dwSystemAffinity);
    return __popcnt64(dwProcessAffinity);
}