Creating Threads

[JJ1]

Hi All,

I'm trying to learn concurrent programming and am a novice to C/C++ - Could anyone help please?

I hope to create a thread using the 'CreateThread' API call and print just 2 simple messages. Unfortunately, the only message that appears is 'Hello from the main function' - nothing from 'MyThread1'. Could anyone tell me what is wrong please?

Also, I need to use semphores later on in my course. How are these declared?


#include <windows.h>
#include <stdio.h>

//prototypes
long WINAPI MyThread1(long lParam);

int main(void)
{
HANDLE hThread;
DWORD dwThreadID;

hThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)MyThread1, NULL, 0, &dwThreadId);
printf( &quot;Hello from the main function&quot; );
return 0;
}

long WINAPI MyThread1(long lParam)
{
printf(&quot;Thread 1 active&quot;
return 0L;
}

Thanks for your time and help,

James.

 

[MarkPQ]

James,

I'm a really newbie to threading as well, I'm about to encounter my first project using them! So I've been doing a bit of reasearch and thing I can actually see what is wrong with your code.

The problem appears to be that your main thread is terminating before the new thread is getting started!

If you put a getch() or Sleep(x) in after you've created the new thread, you will see that it is working

Hope that helps
-Mark