====== 파이썬 쓰레드 문법 ======
파이썬의 쓰레드와 동기화 객체 문법에 대해 정리한다.

===== 함수 -> 쓰레드 =====
<file python threadEx1.py>
# -*- coding: utf-8 -*-

import threading, time

def testThread(id):
    for i in range(10):
        print 'thread(%s) --> %s' % (id, i)
        time.sleep(0)    # context switching

testThreads = []
for i in range(3):
    th = threading.Thread(target=testThread, args=(i,))
    th.start()
    testThreads.append(th)

for th in testThreads:
    th.join()

print 'end'
</file>

===== 클래스 -> 쓰레드 (상속 이용) =====
<file python threadEx2.py>
# -*- coding: utf-8 -*-

import threading, time

class testThread(threading.Thread):
	def run(self):
	    for i in range(10):
	        print 'thread(%s) --> %s' % (self.getName(), i)
	        time.sleep(0)    # context switching

testThreads = []
for i in range(3):
    th = testThread()
    th.start()
    testThreads.append(th)

for th in testThreads:
    th.join()

print 'end'
</file>

===== Lock =====
<file python threadLockEx.py>
# -*- coding: utf-8 -*-

import threading, time

g_count = 0
class testThread(threading.Thread):
	def run(self):
	    global g_count
	    for i in range(100):
	    	lock.acquire()
	    	g_count += 1
	    	lock.release()
	    	time.sleep(0)

lock = threading.Lock()
testThreads = []
for i in range(100):
    th = testThread()
    th.start()
    testThreads.append(th)

for th in testThreads:
    th.join()

print g_count
</file>

===== Semaphore =====
<file python threadSemEx.py>
# -*- coding: utf-8 -*-

import threading, time

g_count = 0
class testThread(threading.Thread):
	def run(self):
	    global g_count
	    for i in range(100):
	    	sem.acquire()
	    	g_count += 1
	    	sem.release()
	    	time.sleep(0)

sem = threading.Semaphore(3)
testThreads = []
for i in range(100):
    th = testThread()
    th.start()
    testThreads.append(th)

for th in testThreads:
    th.join()

print g_count
</file>

===== Event =====
<file python threadEventEx.py>
# -*- coding: utf-8 -*-

import threading, time

eve = threading.Event()
class ready(threading.Thread):
    def run(self):
        print 'Ready'
        eve.set()

class waitAndStart(threading.Thread):
    def run(self):
        print self.getName(), 'wating...'
        eve.wait()
        print self.getName(), 'start'

thList = []

for i in range(3):
    thList.append(waitAndStart())
    thList[i].start()
    
ready().start()

for th in thList:
    th.join()

print 'exit'
</file>

===== 참고 =====
  * [[http://blog.naver.com/shw20319?Redirect=Log&logNo=20190208347|[파이썬 기초] 스레드]]