Python RLock可重入锁 - 多线程修改文件时冲突处理

 

 

RLock

Factory function that returns a new reentrant lock.
A reentrant lock must be released by the thread that acquired it. Once a thread has acquired a reentrant lock, the same thread may acquire it again without blocking; the thread must release it once for each time it has acquired it
可重入锁必须由获取它的线程释放。一旦一个线程获取了可重入锁定，同一个线程就可以再次获取它而不会阻塞；线程每次获取它时都必须释放它一次

# 使用如下：

import os
import json
import threading
from collections import OrderedDict

path = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
report_name = os.path.join(path, 'result/test_report.json')

lock = threading.RLock()


def refresh_report(**kwargs):
    lock.acquire()
    try:
        with open(report_name, 'r') as f:
            data = json.load(f)
            data_now = data
            if kwargs.get("component"):
                comp = kwargs['component'] + "StressTest"
                for k, v in kwargs.items():
                    if k == 'component':
                        continue
                    data_now[comp][k] = v
            else:
                for k, v in kwargs.items():
                    data_now["FinalResult"][k] = v
        with open(report_name, 'w') as f:
            json.dump(OrderedDict(data_now), f, indent=4, ensure_ascii=False)
    except Exception as e:
        print("write " + report_name + "error:" + str(e))
        return False
    finally:
        lock.release()
    return True