某個線程要更改共享數據時，先將其鎖定，此時資源的狀態為<mark>鎖定</mark>，其他線程不能改變，只有等到該線程釋放資源，將資源的狀態變成<mark>非鎖定</mark>，其他的線程才能再次鎖定該資源。互斥鎖保證了每次只有一個線程進行寫入操作，從而保證了多線程情況下數據的正確性。 ```python """ @Date 2021/4/5 """ import threading import time num = 0 mutex = threading.RLock() # 獲取鎖 def demo1(nums): global num mutex.acquire() # 加鎖 for i in range(nums): num += 1 mutex.release() # 解鎖 print("demo1---%d" % num) # 10000000 def demo2(nums): global num mutex.acquire() for i in range(nums): num += 1 mutex.release() print("demo2---%d" % num) # 20000000 def main(): """ t1與t2兩個線程共享一個num變量 """ t1 = threading.Thread(target=demo1, args=(10000000,)) t2 = threading.Thread(target=demo2, args=(10000000,)) t1.start() t2.start() time.sleep(3) print("main---%d" % num) # 20000000 if __name__ == '__main__': main() ```