VS2017 MFC-openMP2.0_#pragma omp parallel sections并行无效

int thID1, thID2;
clock_t t1S, t2S;
clock_t t1E, t2E;
clock_t clS = clock();
#pragma omp parallel sections
{
#pragma omp section
	{
		t1S = clock();
        Func1();
		t1E = clock();
		thID1 = omp_get_thread_num();
	}
#pragma omp section
	{
		t2S = clock();
		Func2();
		t2E = clock();
		thID2 = omp_get_thread_num();
	}
}
clock_t clE = clock();
double tm = double(clE - clS) / CLOCKS_PER_SEC * 1000;
double tm1 = double(t1E - t1S) / CLOCKS_PER_SEC * 1000;
double tm2 = double(t2E - t2S) / CLOCKS_PER_SEC * 1000;
CString tmStr;
tmStr.Format(L"%.1f,%.1f,%.1f,%d,%d", tm1, tm2, tm, thID1, thID2);
SaveLogData2Txt(L"D:\\日志记录.txt", tmStr);

保存的日志输出中: tm1 + tm2 == tm  且 thID1 == thID2 == 0, 程序未并行运行

请教下是哪里出了问题导致程序无法并行运行？

1、是否开启了omp
2、检查并行域中线程数
3、核对变量的属性。
第5行建议改为
#pragma omp parallel sections num_threads(2) shared(thID1, thID2)
学习omp可以看看视频
https://www.bilibili.com/video/BV1uA411v776?p=3