#include?
#include?

#define?N?5
#define?LEFT?（i+N-1）%N
#define?RIGHT?（i+1）%N
#define?THINK_TIME?3
#define?EAT_TIME?2

enum?{?THINKING?HUNGRY?EATING?}?state[N];

pthread_mutex_t?mutex?=?PTHREAD_MUTEX_INITIALIZER?s[N];

void?test（int?i）
{
????if?（state[i]?==?HUNGRY
?????&&?state[LEFT]?!=?EATING
?????&&?state[RIGHT]?!=?EATING）
????{
????????state[i]?=?EATING;
????????pthread_mutex_unlock（&s[i]）;
????}
}

void?take_forks（int?i）
{
????pthread_mutex_lock（&mutex）;
????state[i]?=?HUNGRY;
????test（i）;
????pthread_mutex_unlock（&mutex）;
????pthread_mutex_lock（&s[i]）;
}

void?put_forks（int?i）
{
????pthread_mutex_lock（&mutex）;
????state[i