MemberCounter输出错误的数字

class MemberCounter:
    def __init__(self):
        self.count = 0

    def increment(self):
        self.count += 1

    def decrement(self):
        self.count -= 1

    def get_count(self):
        return self.count

import threading

class MemberCounter:
    def __init__(self):
        self.count = 0
        self.lock = threading.Lock()

    def increment(self):
        with self.lock:
            self.count += 1

    def decrement(self):
        with self.lock:
            self.count -= 1

    def get_count(self):
        with self.lock:
            return self.count

import redis
import time

class MemberCounter:
    def __init__(self, redis_client):
        self.redis_client = redis_client
        self.lock_key = "member_counter_lock"

    def acquire_lock(self, timeout=10):
        start_time = time.time()
        while time.time() - start_time < timeout:
            if self.redis_client.setnx(self.lock_key, "locked"):
                self.redis_client.expire(self.lock_key, timeout)
                return True
            time.sleep(0.1)
        return False

    def release_lock(self):
        self.redis_client.delete(self.lock_key)

    def increment(self):
        if self.acquire_lock():
            try:
                self.count = int(self.redis_client.incr("member_count"))
            finally:
                self.release_lock()

    def get_count(self):
        return int(self.redis_client.get("member_count") or 0)