如何解决多线程编程中的死锁问题

from threading import Thread, Lock

x_lock = Lock()
y_lock = Lock()

def thread_a():
    while True:
        x_lock.acquire()
        y_lock.acquire()
        # 处理共享资源
        y_lock.release()
        x_lock.release()

def thread_b():
    while True:
        y_lock.acquire()
        x_lock.acquire()
        # 处理共享资源
        x_lock.release()
        y_lock.release()

if __name__ == "__main__":
    Thread(target=thread_a).start()
    Thread(target=thread_b).start()

# ...（前面的代码不变）

wait_graph = {}  # 等待图

def detect_deadlock():
    for thread in threading.enumerate():
        if thread.name not in wait_graph:
            wait_graph[thread.name] = set()
    for thread in threading.enumerate():
        if thread.name not in wait_graph:
            continue
        for lock in thread.locks:
            try:
                wait_graph[thread.name].add(lock.locked_by.name)
            except AttributeError:
                pass
    # 检查等待图中是否存在循环
    visited = set()
    path = []
    for thread in wait_graph:
        if thread not in visited:
            deadlock = dfs(thread, visited, path)
            if deadlock:
                return deadlock
    return None

def dfs(thread, visited, path):
    if thread in visited:
        return path
    visited.add(thread)
    path.append(thread)
    for next_thread in wait_graph[thread]:
        deadlock = dfs(next_thread, visited, path)
        if deadlock:
            return deadlock
    path.pop()
    return None

# ...（后面的代码不变）