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

pthread_mutex_t our_mutex = PTHREAD_MUTEX_INITIALIZER;

void* thread_function(void* param){
	pthread_mutex_lock(&our_mutex);
	for(int i = 0; i < 5; i++){
		sleep(1);
		puts((char*)param);
	}
	pthread_mutex_unlock(&our_mutex);
	return 0;
}

int main(){
	pthread_t T1, T2;
	pthread_create(&T1, 0, thread_function, "morning");
	pthread_create(&T2, 0, thread_function, "afternoon");
	pthread_join(T1, 0);
	pthread_join(T2, 0);

	return 0;
}