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Python GIL

  • 2026-06-29 23:50:04
Python GIL
一.什么是GIL?
GIL(Global Interpreter Lock)全局解释器锁,它本质是一个互斥锁,用户保护Python对象,防止多个线程同时执行Python字节码.目的是为了保证内存安全(防止多线程同时修改引用计数导致的内存泄漏或错误)
1.GIL的工作原理
每个python线程在执行前必须先获取GIL,执行完一定数量的字节码释放GIL,其他线程获取GIL.如下图
2.什么时候释放GIL
CPython中有一个机制叫check_interval.CPython解释器会去轮询检查线程GIL的锁住情况.每个一段时间,Python解释器就会强制当前线程去释放GIL,这样别的线程才能有机会执行.
不同版本的Python中check_interval实现方式不一样,早起的Python是100个ticks,而Python3以后,interval是15毫秒
二.什么是CPython?
CPython是Python的默认实现,它的核心是C语言编写的,所以叫C +Python=CPython.它的主要作用是把Python代码转换成计算机能执行的指令,工作流程如下
解析Python代码-->变成抽象语法树(AST)
编译成字节码-->生成.pyc文件(缓存)
在Python虚拟机上运行字节码->执行代码
三.线程安全
Python的线程安全主要依赖全局解释器(GIL)和同步原语(锁,信号量等)
1.GIL能/不能保护的线程安全场景

操作类型

是否原子操作(GIL 保护)

是否需要额外同步

示例

简单变量赋值

不需要

x = 10

list.append()

不需要

lst.append(1)

dict[key] = value

不需要

d["k"] = "v"

+= / -=

需要锁

counter += 1

复合操作(先读后写)

需要锁

if x in lst: lst.remove(x)

文件读写

需要锁

f.write("data")

defaultdict 操作

需要锁

dd[key].append(x)

1).简单的变量赋值
x = 10  # 原子操作(线程安全)y = x   # 原子操作(线程安全)
2).列表(list)的append()和extend
lst = []def safe_append(item):    lst.append(item)  # ✅ 原子操作(GIL 保护)t1 = threading.Thread(target=safe_append, args=(1,))t2 = threading.Thread(target=safe_append, args=(2,))t1.start(); t2.start()t1.join(); t2.join()print(lst)  # 输出可能是 [1, 2] 或 [2, 1],但不会损坏
3).字典(dict)的键值赋值
d = {}def safe_dict_write(key, value):    d[key] = value  # ✅ 原子操作(GIL 保护)t1 = threading.Thread(target=safe_dict_write, args=("a"1))t2 = threading.Thread(target=safe_dict_write, args=("b"2))t1.start(); t2.start()t1.join(); t2.join()print(d)  # 输出 {'a': 1, 'b': 2}(顺序可能不同,但数据完整)
4).集合set
s = set()def safe_set_add(item):    s.add(item)  # ✅ 原子操作(GIL 保护)t1 = threading.Thread(target=safe_set_add, args=(1,))t2 = threading.Thread(target=safe_set_add, args=(2,))t1.start(); t2.start()t1.join(); t2.join()print(s)  # 输出 {1, 2} 或 {2, 1}(不会丢失数据)
5).队列先进先出
from queue import Queueq = Queue()def producer():    for i in range(10):        q.put(i)  # 线程安全def consumer():    while True:        item = q.get()  # 线程安全        print(f"Got {item}")        q.task_done()threading.Thread(target=producer).start()threading.Thread(target=consumer, daemon=True).start()q.join()  # 等待所有任务完成
2.通过锁保证线程安全
threading.lock互斥锁,确保同一时间只有一个线程能访问共享资源
1).符合操作如(+=)
lock = threading.Lock()counter = 0def safe_increment():    global counter    for _ in range(100_000):        with lock:  # ✅ 加锁保证原子性            counter += 1t1 = threading.Thread(target=safe_increment)t2 = threading.Thread(target=safe_increment)t1.start(); t2.start()t1.join(); t2.join()print(counter)  # 正确输出 200_000
with lock 等价于 
lock.acquire()try:    # 代码块finally:    lock.release()  # 确保锁一定会释放
2).列表的pop()或remove()
lock = threading.Lock()lst = [123]def safe_remove():    lock.acquire()  # ✅ 加锁保护    try:        if lst:           lst.pop()     finally:         lock.release() t1 = threading.Thread(target=safe_remove)t2 = threading.Thread(target=safe_remove)t1.start(); t2.start()t1.join(); t2.join()print(lst)  # 正确输出 [1] 或 [1, 2](取决于执行顺序)
3).信号量Semaphore
信号量限制同时访问资源的线程数量
sem = threading.Semaphore(3)  # 最多允许 3 个线程同时运行def worker(id):    with sem:        print(f"Thread {id} working...")        time.sleep(1)for i in range(10):    threading.Thread(target=worker, args=(i,)).start()
4).屏障(Barrier)
让多个线程在某个点同步
from threading import Barrierbarrier = Barrier(3)  # 需要 3 个线程到达屏障点def task():    print("Phase 1")    barrier.wait()  # 等待所有线程完成 Phase 1    print("Phase 2")for i in range(3):    threading.Thread(target=task).start()
5).事件(Event)
让线程等待某个事件触发(适用于一次性通知)
from threading import Eventevent = Event()def waiter():    print("Waiting for event...")    event.wait()  # 阻塞,直到 event.set() 被调用    print("Event triggered!")def setter():    time.sleep(2)    event.set()  # 唤醒所有等待的线程threading.Thread(target=waiter).start()threading.Thread(target=setter).start()

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  1. CONNECT:[ UseTime:0.000314s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000532s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000289s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000260s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000502s ]
  6. SELECT * FROM `set` [ RunTime:0.000207s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000500s ]
  8. SELECT * FROM `article` WHERE `id` = 493648 LIMIT 1 [ RunTime:0.024658s ]
  9. UPDATE `article` SET `lasttime` = 1783072774 WHERE `id` = 493648 [ RunTime:0.021487s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000339s ]
  11. SELECT * FROM `article` WHERE `id` < 493648 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000428s ]
  12. SELECT * FROM `article` WHERE `id` > 493648 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001558s ]
  13. SELECT * FROM `article` WHERE `id` < 493648 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009097s ]
  14. SELECT * FROM `article` WHERE `id` < 493648 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000886s ]
  15. SELECT * FROM `article` WHERE `id` < 493648 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003635s ]
0.135261s