This is the C program without mutex displayed in the lecture "6.2.4. Example of race condition" in the UC3M course "Cybersecurity: A hands-on approach"

RaceConditionExample.c

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

void *add_function();
int addMul = 0;

main() {
	pthread_t thread;
	int ret[70];
	int i=0;
	for (i=0; i<70; i++) {
		ret[i] = pthread_create(&thread, NULL, add_function, NULL);
	}
	
	pthread_exit(NULL);
	printf("RESULT %d\n", addMul);
	exit(EXIT_SUCCESS);
}

void *add_function() {
	int i = 0;
	for (i=0;i<10;i++) {
		int b = 0;
		while (b<400) {
			addMul++;
			b++;
		}
		printf("Result of adding i=0 | %d\n", addMul);
		pthread_exit(NULL);
	}
}