对Python多线程实现同步机制及其遇到的一些问题。本文给出了样例代码 ，主要包括Condition,Event and Queue三种机制
1. 锁机制
threading的Lock类，用该类的acquire函数进行加锁，用realease函数进行解锁，当一个线程调用锁的acquire()方法获得锁时，锁就进入“locked”状态。每次只有一个线程可以获得锁。如果此时另一个线程试图获得这个锁，该线程就会变为“blocked”状态，称为“同步阻塞”
在此没有给出样例
2.条件 Contidion
代码段：
class
Reader(
threading.
Thread):
def
__init__(
self,
condition,
data):
threading.Thread.
__init__(
self)
self.condition = condition
self.data = data
pass
def
run(
self):
while
True:
with
self.condition:
print(
"waiting...")
self.condition.wait()
msg =
self.data.pop()
if
"exit" ==
str(msg).lower():
print (
"exit")
break
print(
"read date:
{}
".format(msg))
def
test_condition():
condition = threading.Condition()
dl=[]
reader = Reader(condition, dl)
reader.daemon =
True
reader.start()
while
True:
with condition:
msg =
input(
"输入：")
dl.append(msg)
print(
"notify...")
condition.notifyAll()
if
"exit" == msg.lower():
break
time.sleep(
0.01)
3.事件 Event
代码段：
class
Reader2(
threading.
Thread):
def
__init__(
self,
event,
data):
threading.Thread.
__init__(
self)
self.event = event
self.data = data
pass
def
run(
self):
while
True:
print(
"waiting...")
self.event.wait()
msg =
self.data.pop()
if
"exit" ==
str(msg).lower():
print (
"exit")
break
print(
"read date:
{}
".format(msg))
def
test_event():
event = threading.Event()
dl=[]
reader2 = Reader2(event, dl)
reader2.daemon =
True
reader2.start()
while
True:
msg =
input(
"输入：")
dl.append(msg)
print(
"notify...")
event.set()
event.clear()
if
"exit" == msg.lower():
break
time.sleep(
0.012)
pass
4.队列 Queue
代码段：
class
Reader3(
threading.
Thread):
def
__init__(
self,
queue):
threading.Thread.
__init__(
self)
self.queue = queue
def
run(
self):
while
True:
print(
"waiting...")
msg =
self.queue.get()
print(
"read data:
{}
".format(msg))
if
"exit" == msg.lower():
break
self.queue.task_done()
pass
def
test_queue():
q = queue.Queue()
reader3 = Reader3(q)
reader3.daemon =
True
reader3.start()
while
True:
msg =
input(
"输入：")
q.put(msg)
print(
"notify...")
time.sleep(
0.01)
if
"exit" == msg.lower():
break
pass
参考文档： https://zhuanlan.zhihu.com/p/27963810