How to return a value from pthread threads in C?

Question

I\'am new to C and would like to play with threads a bit. I would like to return some value from a thread using pthread_exit()

My code is as follows:

Answer 1

I think you have to store the number on heap. The int ret variable was on stack and was destructed at the end of execution of function myThread.

void *myThread()
{
       int *ret = malloc(sizeof(int));
       if (ret == NULL) {
           // ...
       }
       *ret = 42;
       pthread_exit(ret);
}

Don't forget to free it when you don't need it :)

Another solution is to return the number as value of the pointer, like Neil Butterworth suggests.