多线程打印字符串仅一次 [已关闭]

问：

我想编写一个简单的代码，它将使用 4 个线程打印“Hello world”4 次：

#include <stdio.h>
#include <stdlib.h>
#include "omp.h"

int main(void) {
    #pragma omp parallel num_threads(4)
    {
        #pragma omp critical
        {
            //i temporalily changed it to print thread number for debug
            printf("Thread rank: %d\n", omp_get_thread_num());
        }
    }
    return 0;
}

...但是我的代码只打印一次线程号：

据我了解，应该创建 4 个线程，所以这里可能没有错误。#pragma omp parallel num_threads(4)

#pragma omp critical这样程序就不会同时打印文本并产生垃圾。

我使用Visual Studio并打开了openmp支持：

据我从vis studio控制台中了解，线程已创建，但由于某种原因不打印任何内容。

输出：

'Programm.exe' (Win32): Loaded 'mypath here\Programm.exe'. Symbols loaded.
'Programm.exe' (Win32): Loaded 'C:\Windows\System32\ntdll.dll'. 
'Programm.exe' (Win32): Loaded 'C:\Windows\System32\kernel32.dll'. 
'Programm.exe' (Win32): Loaded 'C:\Windows\System32\KernelBase.dll'. 
'Programm.exe' (Win32): Loaded 'C:\Windows\System32\vcomp140d.dll'. 
'Programm.exe' (Win32): Loaded 'C:\Windows\System32\vcruntime140d.dll'. 
'Programm.exe' (Win32): Loaded 'C:\Windows\System32\ucrtbased.dll'. 
The thread 0x5f9c has exited with code 0 (0x0).
'Programm.exe' (Win32): Loaded 'C:\Windows\System32\kernel.appcore.dll'. 
'Programm.exe' (Win32): Loaded 'C:\Windows\System32\msvcrt.dll'. 
The thread 0x30c8 has exited with code 0 (0x0).
The thread 0x4794 has exited with code 0 (0x0).
The program '[5548] Programm.exe' has exited with code 0 (0x0).