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理发师问题java代码 理发师在线问答( 七 )

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double bursty(void);
int main()
{
int i;
seed_random();
pthread_t barber_t,customer_t;
int error;
error=pthread_create(barber_t,NULL,barber,NULL);//创建理发师线程
if(error!=0) {
printf("pthread_create is not created.../n");
return -1;
}
while(1) {
usleep(30000);//等待时间如果小于理发师理发时间则会出现等待者过多,否则不会出现等待者过多的现象
error=pthread_create(customer_t,NULL,customer,NULL);//创建顾客线程
if(error!=0) {
printf("pthread_create is not created.../n");
return -1;
}
}
}
double timediff(struct timeval now,struct timeval earlier)
{
if(now.tv_sec == earlier.tv_sec)
return (now.tv_usec - earlier.tv_usec)/1000000.0;
else
return (1000000*(now.tv_sec - earlier.tv_sec) + now.tv_usec - earlier.tv_usec)/1000000.0;
}
void *barber(void *arg)
{
while(1)
{
sem_wait(customers);//顾客信号量-1
pthread_mutex_lock(mutex);
waiting = waiting -1;
sem_post(barbers);//
pthread_mutex_unlock(mutex);
cut_hair();//理发
}
}
void cut_hair(void)
{
printf("Barber:I am cutting the customer's hair.../n");
usleep(100000);//理发时间
printf("Barber:done./n");
}
void *customer(void *num)
{
pthread_mutex_lock(mutex);
if(waitingCHAIRS)
{
waiting = waiting + 1;
sem_post(customers);
pthread_mutex_unlock(mutex);
sem_wait(barbers);
}
else
{
printf("Waiter is too much.../n");
pthread_mutex_unlock(mutex);
}
//释放占用的资源
}
void seed_random(void)
{
struct timeval randtime;
unsigned short xsub1[3];
gettimeofday(randtime,(struct timezone *)0);
xsub1[0] = (ushort)randtime.tv_usec;
xsub1[1] = (ushort)(randtime.tv_usec16);
xsub1[2] = (ushort)(getpid());
seed48(xsub1);
}
double flat()
{
return drand48()/5;
}
第二问 加个理发师忙碌数量 用来判断 即可
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