| """全局中止信号：第一次 Ctrl+C 设标志位优雅退出，第二次直接强退。""" | |
| from __future__ import annotations | |
| import os | |
| import signal | |
| import threading | |
| ABORT_EVENT = threading.Event() | |
| _INSTALLED = False | |
| _SIGINT_COUNT = 0 | |
| def _handler(signum, frame): | |
| global _SIGINT_COUNT | |
| _SIGINT_COUNT += 1 | |
| ABORT_EVENT.set() | |
| msg = ( | |
| "\n[中止] 收到 Ctrl+C，正在请求主循环退出并落盘，再次按 Ctrl+C 将强制退出...\n" | |
| if _SIGINT_COUNT == 1 | |
| else "\n[中止] 再次收到 Ctrl+C，立即强制退出（可能丢失最近未落盘数据）。\n" | |
| ) | |
| try: | |
| os.write(2, msg.encode("utf-8", errors="replace")) | |
| except Exception: | |
| pass | |
| if _SIGINT_COUNT >= 2: | |
| os._exit(130) | |
| def install_signal_handlers_once() -> None: | |
| global _INSTALLED | |
| if _INSTALLED: | |
| return | |
| try: | |
| signal.signal(signal.SIGINT, _handler) | |
| signal.signal(signal.SIGTERM, _handler) | |
| except Exception: | |
| pass | |
| _INSTALLED = True | |