diff --git a/srcs/main.c b/srcs/main.c
index 55fc1c6..c9064db 100644
--- a/srcs/main.c
+++ b/srcs/main.c
@@ -6,37 +6,18 @@ void	*philo_exec(void *arg)
 
 	philo = (t_philo*)arg;
 	while (1)
-	{
 		write(1, philo->str, ft_strlen(philo->str));
-		write(1, " nb ", 4);
-		ft_putnbr_fd(philo->nbr, 1);
-		write(1, "\n", 1);
-	}
 }
 
 int	main(void)
 {
-	pthread_t	*tid;
-	int			ret;
-	int			n_philo;
-	int			i;
+	pthread_t	id;
 	t_philo		*philo;
 
-	n_philo = 3;
-	philo = malloc(sizeof(philo) * n_philo);
-	tid = malloc(sizeof(pthread_t) * n_philo);
-	i = 0;
-	while (i < n_philo)
-	{
-		philo[i].str = "i'm philosopher";
-		philo[i].nbr = i;
-		ret = pthread_create(&tid[i], NULL, &philo_exec, &philo[i]);
-		i++;
-	}
-	if (ret == 0)
-	{
-		while (1)
-			write(1, "main function\n", 14);      
-	}
+	philo = malloc(sizeof(philo));
+	philo->str = "i'm philosopher\n";
+	pthread_create(&id, NULL, &philo_exec, philo);
+	while (1)
+		write(1, "main function\n", 14);      
     return 0;
 }
diff --git a/srcs/main1_join.c b/srcs/main1_join.c
new file mode 100644
index 0000000..c8cdaf7
--- /dev/null
+++ b/srcs/main1_join.c
@@ -0,0 +1,25 @@
+#include "philo.h"
+
+void	*philo_exec(void *arg)
+{
+	t_philo	*philo;
+
+	philo = (t_philo*)arg;
+	while (1)
+		write(1, philo->str, ft_strlen(philo->str));
+}
+
+int	main(void)
+{
+	pthread_t	id;
+	t_philo		*philo;
+
+	philo = malloc(sizeof(philo));
+	philo->str = "i'm philosopher\n";
+	pthread_create(&id, NULL, &philo_exec, philo);
+	pthread_join(id, NULL);
+	while (1)
+		write(1, "main function\n", 14);      
+    return 0;
+}
+
diff --git a/srcs/main2_multithread.c b/srcs/main2_multithread.c
new file mode 100644
index 0000000..17e556c
--- /dev/null
+++ b/srcs/main2_multithread.c
@@ -0,0 +1,43 @@
+#include "philo.h"
+
+void	*philo_exec(void *arg)
+{
+	t_philo	*philo;
+
+	philo = (t_philo*)arg;
+	while (1)
+	{
+		write(1, philo->str, ft_strlen(philo->str));
+		write(1, " nb ", 4);
+		ft_putnbr_fd(philo->nbr, 1);
+		write(1, "\n", 1);
+		sleep (1);
+	}
+}
+
+int	main(void)
+{
+	pthread_t	*tid;
+	int			n_philo;
+	int			i;
+	t_philo		*philo;
+
+	n_philo = 3;
+	philo = malloc(sizeof(philo) * n_philo);
+	tid = malloc(sizeof(pthread_t) * n_philo);
+	i = 0;
+	while (i < n_philo)
+	{
+		philo[i].str = "i'm philosopher";
+		philo[i].nbr = i;
+		pthread_create(&tid[i], NULL, &philo_exec, &philo[i]);
+		i++;
+	}
+	while (1)
+	{
+		write(1, "main function\n", 14);      
+		sleep (1);
+	}
+    return 0;
+}
+
diff --git a/srcs/main3_mutex.c b/srcs/main3_mutex.c
new file mode 100644
index 0000000..810a6c6
--- /dev/null
+++ b/srcs/main3_mutex.c
@@ -0,0 +1,48 @@
+#include "philo.h"
+
+pthread_mutex_t mutex;
+
+void	*philo_exec(void *arg)
+{
+	t_philo	*philo;
+
+	pthread_mutex_lock(&mutex);
+	philo = (t_philo*)arg;
+	while (1)
+	{
+		write(1, philo->str, ft_strlen(philo->str));
+		write(1, " nb ", 4);
+		ft_putnbr_fd(philo->nbr, 1);
+		write(1, "\n", 1);
+		sleep (1);
+	}
+	pthread_mutex_unlock(&mutex);
+}
+
+int	main(void)
+{
+	pthread_t	*tid;
+	int			n_philo;
+	int			i;
+	t_philo		*philo;
+
+	n_philo = 3;
+	philo = malloc(sizeof(philo) * n_philo);
+	tid = malloc(sizeof(pthread_t) * n_philo);
+	i = 0;
+	pthread_mutex_init(&mutex, NULL);
+	while (i < n_philo)
+	{
+		philo[i].str = "i'm philosopher";
+		philo[i].nbr = i;
+		pthread_create(&tid[i], NULL, &philo_exec, &philo[i]);
+		i++;
+	}
+	while (1)
+	{
+		write(1, "main function\n", 14);      
+		sleep (1);
+	}
+    return 0;
+}
+