CreateThread, how to have single function ran by multiple threads?

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Is this possible? Im so used to using the .NET stuff, that when im in C adding this Multithreading to an app i didnt even think about it.

Basically only one instance of this function seems to be able to be created.

I have function X in a seperate library that contains this function.
Each item that gets created creates a thread to that function.

Only one instance of that function ever gets run(the one that got created first).

Any ideas?

Posted 2-Mar-11 13:44pm

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Anthony Mushrow 2-Mar-11 21:20pm

I just did a quick check with CreateThread myself and everything works as expected, is your setup significantly different to this:

#include <windows.h>
DWORD WINAPI t_func(PVOID args){
	printf("Threaded Write\n"); return 0;
}
int _tmain(int argc, _TCHAR* argv[]){
	HANDLE Threads[5];
	printf("Bacon\n");
	for(int i=0; i<5; i++)
		Threads[i] = CreateThread(NULL, 0, t_func, NULL, 0, NULL);
	WaitForMultipleObjects(5, Threads, true, INFINITE);
	return 0;
}
Output:
 Bacon
 Threaded Write
 Threaded Write
 Threaded Write
 Threaded Write
 Threaded Write

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-03-03T16:43:00

This is quite possible. The same function runs in a separate thread, so each time the same code gets its separate stack, what's wrong with that?

It's quite hard to say why your code works only in one thread. There can be different reasons for that. I need to see you code sample to find out.

—SA