12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667 |
- import signal
- import sys
- from typing import Any, Callable, List, Union
- from ray_release.logger import logger
- _handling_setup = False
- _handler_functions: List[Callable[[int, Any], None]] = []
- _signals_to_handle = {
- sig
- for sig in (
- signal.SIGTERM,
- signal.SIGINT,
- signal.SIGQUIT,
- signal.SIGABRT,
- )
- if hasattr(signal, sig.name)
- }
- _original_handlers = {sig: signal.getsignal(sig) for sig in _signals_to_handle}
- def _terminate_handler(signum=None, frame=None):
- logger.info(f"Caught signal {signal.Signals(signum)}, using custom handling...")
- for fn in _handler_functions:
- fn(signum, frame)
- if signum is not None:
- logger.info(f"Exiting with return code {signum}.")
- sys.exit(signum)
- def register_handler(fn: Callable[[int, Any], None]):
- """Register a function to be used as a signal handler.
- The function will be placed on top of the stack."""
- assert _handling_setup
- _handler_functions.insert(0, fn)
- def unregister_handler(fn_or_index: Union[int, Callable[[int, Any], None]]):
- """Unregister a function by reference or index."""
- assert _handling_setup
- if isinstance(fn_or_index, int):
- _handler_functions.pop(fn_or_index)
- else:
- _handler_functions.remove(fn_or_index)
- def setup_signal_handling():
- """Setup custom signal handling.
- Will run all functions registered with ``register_handler`` in order from
- the most recently registered one.
- """
- global _handling_setup
- if not _handling_setup:
- for sig in _signals_to_handle:
- signal.signal(sig, _terminate_handler)
- _handling_setup = True
- def reset_signal_handling():
- """Reset custom signal handling back to default handlers."""
- global _handling_setup
- if _handling_setup:
- for sig, handler in _original_handlers.items():
- signal.signal(sig, handler)
- _handling_setup = False
|