Posix threads problem

I am trying to understand pthreads by example. I have made the following code that is giving different answers everytime I run! Could anyone explain the bug please? TIA, Sviiya The code is here: #include #include #include #define NUM_THREADS 4 struct thread_data { int thread_id; int sum; }; struct thread_data thread_data_array[NUM_THREADS]; void *PrintHello(void *threadarg) { struct thread_data *my_data; int taskid; int sum; my_data = (struct thread_data *) threadarg; taskid = my_data->thread_id; sum = my_data->sum; printf("Hello World! It's me, thread #%d\n", taskid); return my_data; } int main () { pthread_t threads[NUM_THREADS]; int rc; long t; int sum=0; for (t=0; t

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