#define N 100
typedef int semaphore;
semaphore mutex=1;
semaphore empty=N;
semaphore full=0;

void producer()
{
int item;
while(TRUE)
{
item=produce_item();
down(&empty);
down(&mutex);
insert_item(item);
up(&mutex);
up(&full);
}
}

void consumer(void)
{
int item;

while(TRUE)
{
down(&full);
down(&mutex);
item=remove_item();
up(&mutex);
up(&empty);
consume_item(item);
}
}
记得要好好学习阿

好象书上是有哦