Race condition example

info.txt

This is what happens when I run the program.  Note that 2 and 4 appear twice, but 0 and 1 never appear.  The output is non-deterministic, because there is a race condition, the output could be almost anything.

Arg = 2
Arg = 4
Arg = 3
Arg = 5
Arg = 6
Arg = 2
Arg = 7
Arg = 8
Arg = 9
Arg = 4

main.c

#include <pthread.h>
#include <stdio.h>

#define N 10

void *thread_func(void *arg)
{
    int *ptr = arg;
    printf("Arg = %d\n", *ptr);
    return NULL;
}

int main()
{
    int i;
    pthread_t threads[N];
    for (i = 0; i < N; i++) {
        pthread_create(&threads[i], NULL, thread_func, &i);
    }
    for (i = 0; i < N; i++) {
        pthread_join(threads[i], NULL);
    }
    return 0;
}