gistfile1.txt

// C#
public static int EnumerateGCHeapObjectsInBackgroundThreadWithRuntimeSuspension()
{
    _rootObjects.Add(new CustomGCHeapObject());
    EnumerateHeapObjectsInBackgroundThread();
    GC.Collect();
    return 100;
}

// C++ P/Invoke
extern "C" EXPORT void STDMETHODCALLTYPE EnumerateHeapObjectsInBackgroundThread()
{
    GCHeapEnumerationProfiler* instance = static_cast<GCHeapEnumerationProfiler*>(GCHeapEnumerationProfiler::Instance);
    if (instance == nullptr) {
        printf("Error: profiler instance is null.\n");
        return;
    }

    std::thread([instance]()
                {
                    std::this_thread::sleep_for(std::chrono::seconds(1));
                    instance->ValidateEnumerateGCHeapObjects(0x80131388);
                }).detach();
}

// C++ During GC.Collect, sleep long enough for EnumerateGCHeapObjects to begin
HRESULT STDMETHODCALLTYPE GCHeapEnumerationProfiler::GarbageCollectionStarted(int cGenerations, BOOL generationCollected[], COR_PRF_GC_REASON reason)
{
    SHUTDOWNGUARD();
    printf("GCHeapEnumerationProfiler::GarbageCollectionStarted\nSleeping for 10 seconds\n");
    std::this_thread::sleep_for(std::chrono::seconds(10));
    return S_OK;
}