time.sleep(random.randint(0, 1000) / 1000)
def run(self):
while True:
# wait(self, chopsticks[self.num])
# wait(self, chopsticks[(self.num + 1) % 5])
Swait(self, SemaphoreSet(chopsticks[self.num]),
SemaphoreSet(chopsticks[(self.num + 1) % 5]))
self.eat()
# signal(self, chopsticks[self.num])
# signal(self, chopsticks[(self.num + 1) % 5])
Ssignal(self, SemaphoreSet(chopsticks[self.num]),
SemaphoreSet(chopsticks[(self.num + 1) % 5]))
self.think()
chopsticks = [
Semaphore(1),
Semaphore(1),
Semaphore(1),
Semaphore(1),
Semaphore(1)
]
all_start(Philosopher(0), Philosopher(1), Philosopher(2), Philosopher(3),
Philosopher(4))
print("Done!")
print("Process %s" % num)
class P3(Process):
def __init__(self):
super().__init__()
def run(self):
while True:
print_sems()
wait(self, odd)
wait(self, mutex)
self.print()
signal(self, mutex)
signal(self, empty)
time.sleep(random.randint(0, 10000) / 1000)
def print(self):
num = buff1.pop(0)
print(num)
def print_sems():
print(mutex.value, odd.value, even.value, empty.value)
all_start(P1(), P2(), P3())
super().__init__()
def run(self):
global rightcount
while True:
# print(left.value, right.value)
wait(self, right)
if rightcount == 0:
wait(self, left)
rightcount += 1
signal(self, right)
self.cross()
wait(self, right)
rightcount -= 1
if rightcount == 0:
signal(self, left)
signal(self, right)
time.sleep(random.randint(0, 1000) / 1000)
def cross(self):
print("Car %s →" % self.num)
all_start(
*[LeftCar(i) for i in range(3)],
*[RightCar(i) for i in range(3)],
)
signal(self, in_)
def shopping(self):
customers.append(self.num)
print("shopping：%s" % self.num)
print("Empty %s" % empty.value)
print("shopping_num %s" % len(customers))
time.sleep(random.randint(0, 100))
customers.pop(customers.index(self.num))
def exit(self):
wait(self, out)
print("out：%s" % self.num)
time.sleep(random.randint(0, 1000) / 1000)
signal(self, out)
signal(self, empty)
def run(self):
while True:
self.walk()
self.enter()
self.shopping()
self.exit()
self.walk()
all_start(*[Customer(i) for i in range(N)])
def run(self):
while True:
Swait(self, SemaphoreSet(mx, 1, 1), SemaphoreSet(L, RN, 0))
self.write()
Ssignal(self, SemaphoreSet(mx, None, 1))
time.sleep(random.randint(0, 1000) / 1000)
def write(self):
wlist.append(self.num)
print("Writer %s is writing..." % self.num)
with open(file, 'w') as f:
f.write("I'm writer%02d" % self.num)
time.sleep(random.randint(0, 1000) / 1000)
print('r:{}, w:{}'.format(rlist, wlist))
wlist.pop(wlist.index(self.num))
RN = 3
rlist = [] # 仅做 debug 之用
wlist = [] # 仅做 debug 之用
rmutex = Semaphore(1)
L = Semaphore(RN)
mx = Semaphore(1)
all_start(
*[Writer(i) for i in range(5)],
*[Reader(i) for i in range(5)],
)
while True:
wait(self, full)
wait(self, mutex)
# 临界区
print("Get {}".format(work_queue.get()))
signal(self, mutex)
signal(self, empty)
print_sem(mutex, full, empty)
def print_sem(*sems):
print("sems: " + ' '.join([str(sem.value) for sem in sems]))
size = 20
work_queue = WorkQueue(size)
mutex = Semaphore(1)
full = Semaphore(0)
empty = Semaphore(size)
c1 = Consumer()
p1 = Proceducer()
p2 = Proceducer()
p3 = Proceducer()
all_start(c1, p1, p2, p3)
print("Done!")
