Delete public commit queue to avoid confusion after move to internal repo

commit-queue/sig_handler.py

-# Copyright (c) 2012 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import logging as _logging
-import signal as _signal
-import threading as _threading
-
-_OK_HANDLERS = set((
-    _signal.SIG_DFL,
-    _signal.SIG_IGN,
-    _signal.default_int_handler,
-))
-
-# Only manipulated on the main thread, so it doesn't need a lock.
-_PREV_HANDLERS = {}
-
-_SET_SIGNALS_LOCK = _threading.Lock()
-_SET_SIGNALS = set()
-
-
-def _handler(signal_num, _):
-  with _SET_SIGNALS_LOCK:
-    _SET_SIGNALS.add(signal_num)
-  _signal.signal(signal_num, _PREV_HANDLERS[signal_num])
-  _logging.warn(
-      '\n'
-      'commit-queue will exit at the end of this processing loop.\n'
-      'Hit Ctrl-C again to exit immediately.'
-  )
-
-
-def getTriggeredSignals():
-  with _SET_SIGNALS_LOCK:
-    return _SET_SIGNALS.copy()
-
-
-def installHandlers(*signal_numbers):
-  for signal_num in signal_numbers:
-    cur_handler = _signal.getsignal(signal_num)
-    if cur_handler == _handler:
-      continue
-
-    assert cur_handler in _OK_HANDLERS, \
-        'A signal handler is already installed for signal %d' % signal_num
-
-    _PREV_HANDLERS[signal_num] = cur_handler
-    _signal.signal(signal_num, _handler)