Just sample of multi-thread in C

gistfile1.c

typedef struct {
	char *str;
	int size;
	int counter[256];
} thread_args;

void* threadFunc(void *args) {
	thread_args *params = (thread_args *) args;

	for (int i = params->size/2; i < params->size; i++) {
		params->counter[params->str[i]]++;
	}

	return NULL;
}

char mostFrequentCharacter(char* str, int size) {
	thread_args args = {.str = str, .size = size, .counter = {0}};

	char result = NULL;
	int occurences = 0;

	pthread_t thread;
	pthread_create(&thread, NULL, threadFunc, &args);

	for (int i = 0; i < args.size/2; i++) {
		args.counter[args.str[i]]++;
	}

	pthread_join(thread, NULL);

	for (int i = 0; i < 256; i++) {
		if (args.counter[i] > occurences) {
			occurences = args.counter[i];
			result = (char) i;
		}
	}

	return result;
}