primes实验记录
反复关闭同一个管道口 错误的
p = get a number from left neighbor
print p
loop:
n = get a number from left neighbor
if (p does not divide n)
send n to right neighbor

反复关闭同一个管道口 错误的
p = get a number from left neighbor
print p
loop:
n = get a number from left neighbor
if (p does not divide n)
send n to right neighbor
