threding.local
Posted wt7018
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作用:为每一个线程开辟一个独立的内存空间
示例
from threading import Thread, local import time obj = local() def test(i): obj.xx = i time.sleep(2) print(obj.xx, i) for i in range(10): t = Thread(target=test, args=(i, )) t.start()
实现原理
from threading import Thread import threading import time # dic = {} def test(i): index = threading.get_ident() if index in dic: dic[index][‘xx‘] = i else: dic[index] = {‘xx‘: i} time.sleep(1) print(dic[index][‘xx‘], i) for i in range(10): t = Thread(target=test, args=(i, )) t.start()
改良
import threading import time import greenlet try: get_ident = greenlet.getcurrent except Exception as e: get_ident = threading.get_ident class Local: dic = {} def __getattr__(self, item): index = get_ident() if index in self.dic: return self.dic[index][item] else: return None def __setattr__(self, key, value): index = get_ident() if index in self.dic: self.dic[index][key] = value else: self.dic[index] = {key: value} obj = Local() def test(a): obj.xx = a time.sleep(2) print(obj.xx, a) for i in range(10): t = threading.Thread(target=test, args=(i, )) t.start()
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