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hanging_threads.py
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hanging_threads.py
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# The MIT License (MIT)
# ---------------------
#
# Copyright (C) 2014 Nicco Kunzmann
#
# https://gist.github.com/niccokunzmann/6038331
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
"""
copy this code and do
import hanging_threads
If a thread is at the same place for SECONDS_FROZEN then the stacktrace is printed.
This script prints
-------------------- Thread 6628 --------------------
File "hanging_threads.py", line 70, in <module>
time.sleep(3) # TEST
-------------------- Thread 6628 --------------------
File "hanging_threads.py", line 70, in <module>
time.sleep(3) # TEST
"""
import sys
import threading
try:
from threading import _get_ident as get_ident
except ImportError:
from thread import get_ident
import linecache
import time
SECONDS_FROZEN = 10 # seconds
TESTS_PER_SECOND = 10
def frame2string(frame):
# from module traceback
lineno = frame.f_lineno # or f_lasti
co = frame.f_code
filename = co.co_filename
name = co.co_name
s = ' File "{}", line {}, in {}'.format(filename, lineno, name)
line = linecache.getline(filename, lineno, frame.f_globals).lstrip()
return s + '\n\t' + line
def thread2list(frame):
l = []
while frame:
l.insert(0, frame2string(frame))
frame = frame.f_back
return l
def monitor():
self = get_ident()
old_threads = {}
while 1:
time.sleep(1. / TESTS_PER_SECOND)
now = time.time()
then = now - SECONDS_FROZEN
frames = sys._current_frames()
new_threads = {}
for frame_id, frame in frames.items():
new_threads[frame_id] = thread2list(frame)
for thread_id, frame_list in new_threads.items():
if thread_id == self: continue
if thread_id not in old_threads or \
frame_list != old_threads[thread_id][0]:
new_threads[thread_id] = (frame_list, now)
elif old_threads[thread_id][1] < then:
print_frame_list(frame_list, frame_id)
else:
new_threads[thread_id] = old_threads[thread_id]
old_threads = new_threads
def print_frame_list(frame_list, frame_id):
sys.stderr.write('-' * 20 +
'Thread {}'.format(frame_id).center(20) +
'-' * 20 +
'\n' +
''.join(frame_list))
def start_monitoring():
"""After hanging SECONDS_FROZEN the stack trace of the deadlock is printed automatically."""
thread = threading.Thread(target=monitor)
thread.daemon = True
thread.start()
return thread
monitoring_thread = start_monitoring()
if __name__ == '__main__':
SECONDS_FROZEN = 1
time.sleep(3) # TEST