void think(unsigned int myID){
int currentThink = randomGaussian_r(11, 7, &seed[myID]);
if (currentThink < 0) currentThink = 0;
printf("(think) Philo %d is thinking for %d seconds.\n", myID, currentThink);
fflush(stdout);
sleep(currentThink);
return;
}
int eat(unsigned int myID){
int currentEat = randomGaussian_r(9, 3, &seed[myID]);
if (currentEat< 0) currentEat = 0;
printf("(eat) Philo %d is eating for %d seconds.\n", myID, currentEat);
fflush(stdout);
sleep(currentEat);
return currentEat;
}
// This function simulates the philosophers eating and thinking.
void* philosopher(void* arg){
int philo = *((int*) arg);
int eatingTime = 0;
int totalEatingTime = 0;
int thinkingTime = 0;
int totalThinkingTime =0;
free(arg);
unsigned int state = philo;
while(totalEatingTime <= MAX_EATING_TIME){
// try to acquire chopsticks if available.
while (1) {
pthread_mutex_lock(&chopstiks[philo]);
int rtrn = pthread_mutex_trylock(&chopstiks[(philo+1) % 5]);
if (rtrn == EBUSY)
pthread_mutex_unlock(&chopstiks[philo]);
else break;
sleep(1);
}
/******* philosopher i is eating for a random amount of time.*******/
if((eatingTime = randomGaussian_r(EATING_MEAN, EATING_STD, &state)) < 0)
eatingTime = 0;
eating(philo, eatingTime, totalEatingTime);
totalEatingTime += eatingTime;
// done eating, Release the chopsticks.
pthread_mutex_unlock(&chopstiks[philo]);
pthread_mutex_unlock(&chopstiks[(philo+1) % 5]);
/****** Philo is thinking for a random amount of time. ********/
if((thinkingTime = randomGaussian_r(THINKING_MEAN, THINKING_STD, &state)) < 0)
thinkingTime = 0;
totalThinkingTime += thinkingTime;
thinking(philo, thinkingTime, totalThinkingTime);
}
printf("Philo %i has finished eating. [Total time spent eating = %i]\n", philo, totalEatingTime);
philoTimeEating[philo] = totalEatingTime;
philoTimeThinking[philo] = totalThinkingTime;
return NULL;
}
