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# -*- coding: utf-8 -*- | |
import os,time | |
import threading | |
rlock = threading.RLock() | |
curPosition = 0 | |
class Reader(threading.Thread): | |
def __init__(self, res): | |
self.res = res | |
super(Reader, self).__init__() | |
def run(self): | |
global curPosition | |
fstream = open(self.res.fileName, 'r') | |
while True: | |
#锁定共享资源 | |
rlock.acquire() | |
startPosition = curPosition | |
curPosition = endPosition = (startPosition + self.res.blockSize) if (startPosition + self.res.blockSize) < self.res.fileSize else self.res.fileSize | |
#释放共享资源 | |
rlock.release() | |
if startPosition == self.res.fileSize: | |
break | |
elif startPosition != 0: | |
fstream.seek(startPosition) | |
fstream.readline() | |
pos = fstream.tell() | |
while pos < endPosition: | |
line = fstream.readline() | |
#处理line | |
#print(line.strip()) | |
pos = fstream.tell() | |
fstream.close() | |
class Resource(object): | |
def __init__(self, fileName): | |
self.fileName = fileName | |
#分块大小 | |
self.blockSize = 100000000 | |
self.getFileSize() | |
#计算文件大小 | |
def getFileSize(self): | |
fstream = open(self.fileName, 'r') | |
fstream.seek(0, os.SEEK_END) | |
self.fileSize = fstream.tell() | |
fstream.close() | |
if __name__ == '__main__': | |
starttime = time.clock() | |
#线程数 | |
threadNum = 4 | |
#文件 | |
fileName = 'IPData.txt'; | |
res = Resource(fileName) | |
threads = [] | |
#初始化线程 | |
for i in range(threadNum): | |
rdr = Reader(res) | |
threads.append(rdr) | |
#开始线程 | |
for i in range(threadNum): | |
threads[i].start() | |
#结束线程 | |
for i in range(threadNum): | |
threads[i].join() | |
print(time.clock() - starttime) |
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