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#include <Windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <vector>

const unsigned int s_LoopCount = 5000 * 1000;
const unsigned int s_MemSize = 100;
const unsigned int s_CoreCount = 32;
HANDLE s_heap = NULL;

struct PerfInfo
{
    bool  globalHeap;
    DWORD tickCount;
};

DWORD WINAPI ThreadProc(LPVOID param)
{
    PerfInfo * info = (PerfInfo*)param;
    DWORD flag = 0;

    HANDLE heap = NULL;
    if (info->globalHeap)
    {
        heap = s_heap;
        flag = 0;
    }
    else
    {
        heap = HeapCreate(0, 0, 0);
        ULONG ul = 0;
        HeapSetInformation(heap, HeapCompatibilityInformation, &ul, sizeof(ul));
        flag = 0;
    }

    std::vector<char*> vBufs;
    vBufs.reserve(s_LoopCount);
    vBufs.resize(s_LoopCount);

    DWORD dwBegin = GetTickCount();
    for (unsigned int i = 0; i < s_LoopCount; ++i)
    {
        char* p = (char*)HeapAlloc(heap, flag, s_MemSize);
        vBufs[i] = p;
    }

    for (unsigned int i = 0; i < s_LoopCount; ++i)
    {
        HeapFree(heap, flag, (void*)vBufs[i]);
    }

    DWORD dwEnd = GetTickCount();

    info->tickCount = dwEnd - dwBegin;

    if (!info->globalHeap)
    {
        HeapDestroy(heap);
    }

    return 0;
}

DWORD ParaDynamicMem(unsigned int coreCount, bool gHeap)
{
    HANDLE arraThread[s_CoreCount];
    PerfInfo info[s_CoreCount];
    for (unsigned int i = 0; i < coreCount; ++i)
    {
        info[i].globalHeap = gHeap;
        info[i].tickCount = 0;
        arraThread[i] = CreateThread(NULL,
                                    0,
                                    ThreadProc,
                                    (void*)(info + i),
                                    0,
                                    NULL);
    }

    WaitForMultipleObjects(coreCount, arraThread, TRUE, INFINITE);

    DWORD tickCount = 0;
    for (unsigned int i = 0; i < coreCount; ++i)
    {
        tickCount += info[i].tickCount;
    }

    tickCount = (DWORD)((tickCount + 0.0) / coreCount);

    return tickCount;
}

int main(int argc, char** argv)
{
    s_heap = HeapCreate(0, 0, 0);

    unsigned int n = argv[1][0] - '0';
    bool g = (argv[2][0] == '1');
    DWORD time = 0;

    time = ParaDynamicMem(n, g);
    printf("%I32u core time:%I32u, use global heap? %s.\n", n, time, g ? "true" : "false");
    
    return 0;
}