# -*- coding: utf-8 -*-
import threading
import time
#方式二是方式一的具體，方式一為類構(gòu)造，方式二為方法實(shí)例構(gòu)造，其實(shí)本質(zhì)都是一樣，都是調(diào)用threading.Thread模塊
#方式一
count = 0
class Counter(threading.Thread):
  def __init__(self, lock, threadName):
    #注意：一定要顯式的調(diào)用父類的初始化函數(shù),這里可以指定生成的線程名，可以是*args、**kwargs
    #def __init__(self, group=None, target=None, name=None, args=(), kwargs={})，其中g(shù)roup是預(yù)留的，將來(lái)用于擴(kuò)展
    super(Counter, self).__init__(name=threadName)
    self.lock = lock
  def run(self):
    global count
    self.lock.acquire()
    for i in range(100):
      count = count + 1
    self.lock.release()
#方式二
lockA = threading.Lock()
lockB = threading.Lock()
rLock = threading.RLock()
condt = threading.Condition()
event = threading.Event()
def add(lockA):
  global count
  #定義當(dāng)前資源只能單線程訪問(wèn)，鎖住后完成資源調(diào)用一定要釋放鎖，不然會(huì)造成死鎖狀態(tài)，甚至程序崩潰
  lockA.acquire()
  for i in range(1000):
    count = count + 1
  #資源調(diào)用完畢，釋放鎖
  lockA.release()
def addRunner():
  for i in range(2):
    th = threading.Thread(target=rloc, args=(rLock,))
    #開(kāi)啟線程，從此刻起，多線程開(kāi)始，主線程繼續(xù)前行
    th.start()
    #調(diào)用Thread.join[timeout]將會(huì)使主調(diào)線程堵塞，直到被調(diào)用線程運(yùn)行結(jié)束或超時(shí)。參數(shù)timeout是一個(gè)數(shù)值類型，表示超時(shí)時(shí)間
    th.join()
    print '----- %s is start -----' % th.getName()
    print "over"
#RLock允許在同一線程中被多次acquire，避免單線程出現(xiàn)思索情況
def rloc(rLock):
  rLock.acquire()
  for i in range(2):
    rLock.acquire()
    print i,
    rLock.release()
  rLock.release()
  print "over!"
def rlocRun():
  for i in range(2):
    th = threading.Thread(target=rloc, args=(rLock,))
    th.start()
    print '----- %s is start -----' % th.getName()
    print "over"
#現(xiàn)在出現(xiàn)復(fù)雜的場(chǎng)景，多個(gè)線程需要調(diào)用多個(gè)共同的資源，此時(shí)就需要threading.Condition出馬,加入簡(jiǎn)單的說(shuō)就是A搞完了A的事
# ，就發(fā)廣播說(shuō)明自己搞定了,其它人可以進(jìn)來(lái)了，B同理。
def cond(cond):
  #適合那種主動(dòng)休眠，被動(dòng)喚醒的場(chǎng)景
  cond.acquire()
  global count
  for i in range(1000):
    count = count + 1
  #喚醒一個(gè)掛起的線程（如果存在掛起的線程）,提醒當(dāng)前的掛起的線程看看其它的鎖開(kāi)了沒(méi)有，如果開(kāi)了就搞其他的事。
  #注意：notify()方法不會(huì)釋放所占用的瑣。
  cond.notify()
  #wait方法釋放內(nèi)部所占用的瑣，同時(shí)線程被掛起，直至接收到通知被喚醒或超時(shí)
  cond.wait(5)
  #相信大家應(yīng)該看出問(wèn)題來(lái)了，最后一個(gè)線程咋辦列，沒(méi)人喚醒啊，這個(gè)時(shí)候應(yīng)該做過(guò)一個(gè)判斷
  cond.release()
  print "over!"
def condRun():
  global condt
  for i in range(0, 3):
    th = threading.Thread(target=cond, args=(condt, ))
    th.start()
    print '----- %s is start -----' % th.getName()
  print "over"
#此時(shí)可能會(huì)有一點(diǎn)問(wèn)題，就是線程的同步（并發(fā)）問(wèn)題怎么解決呢？此時(shí)threading.Event出馬
def even(n, event):
  while not event.isSet():
    print 'Thread %s is ready' % n
  time.sleep(1)
  #同condition一樣，掛起該線程，等待set開(kāi)關(guān)
  event.wait()
  while event.isSet():
    print 'Thread %s is running' % n
    time.sleep(1)
def evenRun():
  for i in range(0, 2):
    th = threading.Thread(target=even, args=(i, event))
    th.start()
  time.sleep(3)
  print '----- event is set -----'
  event.set()
  time.sleep(3)
  print '----- event is clear -----'
  event.clear()
if __name__ == "__main__":
  Counter(lockA, "thread1").start()
  addRunner()
  rlocRun()
  condRun()
  evenRun()