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# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the license found in the
# LICENSE file in the root directory of this source tree.
import logging
import os
from queue import Queue, Empty
import signal
import sys
import threading
import traceback
logger = logging.getLogger(__name__)
class DeadlockDetect:
def __init__(self, use: bool = False, timeout: float = 120.):
self.use = use
self.timeout = timeout
self._queue: Queue = Queue()
def update(self, stage: str):
if self.use:
self._queue.put(stage)
def __enter__(self):
if self.use:
self._thread = threading.Thread(target=self._detector_thread)
self._thread.start()
def __exit__(self, exc_type, exc_val, exc_tb):
if self.use:
self._queue.put(None)
self._thread.join()
def _detector_thread(self):
logger.debug("Deadlock detector started")
last_stage = "init"
while True:
try:
stage = self._queue.get(timeout=self.timeout)
except Empty:
break
if stage is None:
logger.debug("Exiting deadlock detector thread")
return
else:
last_stage = stage
logger.error("Deadlock detector timed out, last stage was %s", last_stage)
for th in threading.enumerate():
print(th, file=sys.stderr)
traceback.print_stack(sys._current_frames()[th.ident])
print(file=sys.stderr)
sys.stdout.flush()
sys.stderr.flush()
os.kill(os.getpid(), signal.SIGKILL)
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