import threading
import time

class Num:
  def __init__(self):
    self.num = 0
    self.lock = threading.Lock()
  def add(self):
    self.lock.acquire()#加鎖，鎖住相應(yīng)的資源
    self.num += 1
    num = self.num
    self.lock.release()#解鎖，離開該資源
    return num

n = Num()
class jdThread(threading.Thread):
  def __init__(self,item):
    threading.Thread.__init__(self)
    self.item = item
  def run(self):
    time.sleep(2)
    value = n.add()#將num加1，并輸出原來的數(shù)據(jù)和+1之后的數(shù)據(jù)
    print(self.item,value)

for item in range(5):
  t = jdThread(item)
  t.start()
  t.join()#使線程一個(gè)一個(gè)執(zhí)行

import threading
import time
class Num:
  def __init__(self):
    self.num = 0
    self.sem = threading.Semaphore(value = 3)
    #允許最多三個(gè)線程同時(shí)訪問資源

  def add(self):
    self.sem.acquire()#內(nèi)部計(jì)數(shù)器減1
    self.num += 1
    num = self.num
    self.sem.release()#內(nèi)部計(jì)數(shù)器加1
    return num

n = Num()
class jdThread(threading.Thread):
  def __init__(self,item):
    threading.Thread.__init__(self)
    self.item = item
  def run(self):
    time.sleep(2)
    value = n.add()
    print(self.item,value)

for item in range(100):
  t = jdThread(item)
  t.start()
  t.join()

"""
一個(gè)簡(jiǎn)單的生產(chǎn)消費(fèi)者模型，通過條件變量的控制產(chǎn)品數(shù)量的增減，調(diào)用一次生產(chǎn)者產(chǎn)品就是+1，調(diào)用一次消費(fèi)者產(chǎn)品就會(huì)-1.
"""

"""
使用 Condition 類來完成，由于它也可以像鎖機(jī)制那樣用，所以它也有 acquire 方法和 release 方法，而且它還有
wait， notify， notifyAll 方法。
"""

import threading
import queue,time,random

class Goods:#產(chǎn)品類
  def __init__(self):
    self.count = 0
  def add(self,num = 1):
    self.count += num
  def sub(self):
    if self.count>=0:
      self.count -= 1
  def empty(self):
    return self.count <= 0

class Producer(threading.Thread):#生產(chǎn)者類
  def __init__(self,condition,goods,sleeptime = 1):#sleeptime=1
    threading.Thread.__init__(self)
    self.cond = condition
    self.goods = goods
    self.sleeptime = sleeptime
  def run(self):
    cond = self.cond
    goods = self.goods
    while True:
      cond.acquire()#鎖住資源
      goods.add()
      print("產(chǎn)品數(shù)量:",goods.count,"生產(chǎn)者線程")
      cond.notifyAll()#喚醒所有等待的線程--》其實(shí)就是喚醒消費(fèi)者進(jìn)程
      cond.release()#解鎖資源
      time.sleep(self.sleeptime)

class Consumer(threading.Thread):#消費(fèi)者類
  def __init__(self,condition,goods,sleeptime = 2):#sleeptime=2
    threading.Thread.__init__(self)
    self.cond = condition
    self.goods = goods
    self.sleeptime = sleeptime
  def run(self):
    cond = self.cond
    goods = self.goods
    while True:
      time.sleep(self.sleeptime)
      cond.acquire()#鎖住資源
      while goods.empty():#如無產(chǎn)品則讓線程等待
        cond.wait()
      goods.sub()
      print("產(chǎn)品數(shù)量:",goods.count,"消費(fèi)者線程")
      cond.release()#解鎖資源

g = Goods()
c = threading.Condition()

pro = Producer(c,g)
pro.start()

con = Consumer(c,g)
con.start()

import threading
import queue
import time
import random

'''
1.創(chuàng)建一個(gè) Queue.Queue() 的實(shí)例，然后使用數(shù)據(jù)對(duì)它進(jìn)行填充。
2.將經(jīng)過填充數(shù)據(jù)的實(shí)例傳遞給線程類，后者是通過繼承 threading.Thread 的方式創(chuàng)建的。
3.每次從隊(duì)列中取出一個(gè)項(xiàng)目，并使用該線程中的數(shù)據(jù)和 run 方法以執(zhí)行相應(yīng)的工作。
4.在完成這項(xiàng)工作之后，使用 queue.task_done() 函數(shù)向任務(wù)已經(jīng)完成的隊(duì)列發(fā)送一個(gè)信號(hào)。
5.對(duì)隊(duì)列執(zhí)行 join 操作，實(shí)際上意味著等到隊(duì)列為空，再退出主程序。
'''

class jdThread(threading.Thread):
  def __init__(self,index,queue):
    threading.Thread.__init__(self)
    self.index = index
    self.queue = queue

  def run(self):
    while True:
      time.sleep(1)
      item = self.queue.get()
      if item is None:
        break
      print("序號(hào)：",self.index,"任務(wù)",item,"完成")
      self.queue.task_done()#task_done方法使得未完成的任務(wù)數(shù)量-1

q = queue.Queue(0)
'''
初始化函數(shù)接受一個(gè)數(shù)字來作為該隊(duì)列的容量，如果傳遞的是
一個(gè)小于等于0的數(shù)，那么默認(rèn)會(huì)認(rèn)為該隊(duì)列的容量是無限的.
'''
for i in range(2):
  jdThread(i,q).start()#兩個(gè)線程同時(shí)完成任務(wù)

for i in range(10):
  q.put(i)#put方法使得未完成的任務(wù)數(shù)量+1