openMP线程问题 [英] openMP threading problem

问题描述

在尝试学习openMP时，我遇到了这段代码示例

as I was trying to learn openMP , I came across this sample of code

#include < stdio.h>
#include < omp.h> // Include OpenMP
int main(int argc, char **argv)
{
#pragma omp parallel num_threads(10)
		{
			int threadNum;
			threadNum = omp_get_thread_num();
			printf("This is thread %d\n", threadNum);
		}
	return 0;
}

作者说它可以正常打印0到9的ID.
但是当我尝试它时，它只会显示id0.即，只有一个线程正在运行.
知道我的操作系统是win7，处理器是Intel icore7

the author said that it worked correctly print ids from 0-9.
but when I try it ,it only print id 0. i.e, only one thread is running .
knowing that my OS is win7 and processor is Intel icore7

推荐答案

此示例也在wiki上使用障碍. stdout不一定是线程安全的.再看一下Wiki上的内容:
http://en.wikipedia.org/wiki/OpenMP [

This example is also on the wiki where they use barriers. stdout doesn''t have to be thread safe. Have another look at the wiki on this:
http://en.wikipedia.org/wiki/OpenMP[^]

Good luck!

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