python防止程序多开，但程序运行脚本

山山而川潺潺如镜2026-01-03 8:41

LOG_FILE="./app.log"

PID_FILE="./PID.txt"

def log(message):

timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")

line = f"[{timestamp}] {message}"

print(line)

with open(LOG_FILE, "a", encoding="utf-8") as f:

f.write(line + "\n")

def main():

p = multiprocessing.Process(target=realtime_predict_and_control)

p.start()

log(f"启动任务进程 PID={p.pid}")

p.join()

def is_main_process_running():

"""检查 PID 文件中的主进程是否仍在运行"""

if not os.path.exists(PID_FILE):

return False

try:

with open(PID_FILE, "r", encoding='utf-8-sig') as f:

pid = int(f.read().strip())

except:

return False

return psutil.pid_exists(pid)

def write_pid():

"""写入当前主进程 PID"""

with open(PID_FILE, "w") as f:

f.write(str(os.getpid()))

==========================

if name == "main ":

multiprocessing.freeze_support()

复制代码

if is_main_process_running():
    log("已有实例在运行（主进程存在），退出。")
    time.sleep(3)
    sys.exit(0)

write_pid()
main()