//philosopher
void *philosopher(void *id) {
for(;;){
//extract the id passed to the philosopher function
int idt = (long long int)id;
//print out required text
printf("Philosopher %d is is thinking\n", idt);fflush(stdout);
napping(MAX_NAP_T1);
printf("Philosopher %d is is hungry\n", idt);fflush(stdout);
//acquire chopstick to left
pthread_mutex_lock(&chopsticks[idt]);
printf("Philosopher %d picking up chopstick %d\n", idt, idt);fflush(stdout);
napping(MAX_NAP_T1);
//acquire chopstick to right
pthread_mutex_lock(&chopsticks[(idt+1) % 5]);
printf("Philosopher %d picking up chopstick %d\n", idt, (idt+1) % 5); fflush(stdout);
//acquire chip
printf("Philosopher %d is is starting to eat\n", idt);fflush(stdout);
napping(MAX_NAP_T2);
printf("Philosopher %d is is done eating\n", idt); fflush(stdout);
//release chopstick to left
pthread_mutex_unlock(&chopsticks[idt]);
printf("Philosopher %d putting down chopstick %d\n", idt, idt); fflush(stdout);
napping(MAX_NAP_T1);
//release chopstick to right
pthread_mutex_unlock(&chopsticks[(idt+1) % 5]);
printf("Philosopher %d putting down chopstick %d\n", idt, (idt+1) % 5); fflush(stdout);
}
}
void * Philosopher (void *id){
//struct parm *param = (struct parm *)p;
//int n = param->id;
//pthread_mutex_t *chopsticks = param->chopsticks;
long long n = (long long)id;
while(1){
printf("Philosopher %lld is thinking.\n", n);
napping(2);
printf("Philosopher %lld is hungry.\n", n);
if(n>((n+1)%5)){
// Tries to get chopsticks
if(pthread_mutex_lock(&chopsticks[(n+1)%5])){
perror("Wait for mutex failed right");
exit(-1);
}
// napping to encourage deadlock to occur
napping(1);
if(pthread_mutex_lock(&chopsticks[n])){
perror("Wait for mutex failed left");
exit(-1);
}
}else{
// Tries to get chopsticks
if(pthread_mutex_lock(&chopsticks[n])){
perror("Wait for mutex failed left");
exit(-1);
}
// napping to encourage deadlock to occur
napping(1);
if(pthread_mutex_lock(&chopsticks[(n+1)%5])){
perror("Wait for mutex failed right");
exit(-1);
}
}
printf("Philosopher %lld is starting to eat.\n", n);
napping(1);
printf("philosopher %lld is done eating.\n", n);
// Put down the chopsticks
if(pthread_mutex_unlock(&chopsticks[n])){
perror("Unlock mutex failed left");
exit(-1);
}
if(pthread_mutex_unlock(&chopsticks[(n+1)%5])){
perror("Unlock mutex failed right");
exit(-1);
}
fflush(stdout);
}
pthread_exit(NULL);
}
void* Philosopher(void *id){
while(1){
long long id2 = *(long long*)id;
printf("Philosopher %llu is thinking\n",id2);
napping(1);
printf("Philosopher %llu is hungry\n", id2);
pthread_mutex_lock(&chopsticks[(id2+1)%5]);
printf("Philosopher %d picking up chopstick %d\n", id2, (id2+1)%5);
pthread_mutex_lock(&chopsticks[(id2)%5]);
printf("Philosopher %d picking up chopstick %d\n", id2, (id2%5));
printf("Philosopher %llu is starting to eat\n", id2);
napping(2);
printf("Philosopher %llu is done eating\n", id2);
//adding napping to encourage deadlock
napping(50000000);
pthread_mutex_unlock(&chopsticks[(id2+1)%5]);
printf("Philosopher %d putting down chopstick %d\n", id2, (id2+1)%5);
napping(50000000);
pthread_mutex_unlock(&chopsticks[(id2)%5]);
printf("Philosopher %d putting down chopstick %d\n", id2, (id2)%5);
}
}
