b284b88746
taken from https://code.activestate.com/recipes/577334-how-to-debug-deadlocked-multi-threaded-programs/
133 lines
4.0 KiB
Python
133 lines
4.0 KiB
Python
#!/usr/bin/env python
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#
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# Copyright (C) 2010 Laszlo Nagy (nagylzs)
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#
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# Permission is hereby granted, free of charge, to any person
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# obtaining a copy of this software and associated documentation files
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# (the "Software"), to deal in the Software without restriction,
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# including without limitation the rights to use, copy, modify, merge,
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# publish, distribute, sublicense, and/or sell copies of the Software,
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# and to permit persons to whom the Software is furnished to do so,
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# subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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#
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# Taken from: https://code.activestate.com/recipes/577334-how-to-debug-deadlocked-multi-threaded-programs/
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"""Stack tracer for multi-threaded applications.
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Usage:
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import stacktracer
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stacktracer.start_trace("trace.html",interval=5,auto=True) # Set auto flag to always update file!
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....
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stacktracer.stop_trace()
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"""
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import sys
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import traceback
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from pygments import highlight
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from pygments.lexers import PythonLexer
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from pygments.formatters import HtmlFormatter
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# Taken from http://bzimmer.ziclix.com/2008/12/17/python-thread-dumps/
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def stacktraces():
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code = []
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for threadId, stack in sys._current_frames().items():
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code.append("\n# ThreadID: %s" % threadId)
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for filename, lineno, name, line in traceback.extract_stack(stack):
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code.append('File: "%s", line %d, in %s' % (filename, lineno, name))
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if line:
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code.append(" %s" % (line.strip()))
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return highlight("\n".join(code), PythonLexer(), HtmlFormatter(
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full=False,
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# style="native",
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noclasses=True,
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))
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# This part was made by nagylzs
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import os
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import time
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import threading
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class TraceDumper(threading.Thread):
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"""Dump stack traces into a given file periodically."""
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def __init__(self, fpath, interval, auto):
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"""
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@param fpath: File path to output HTML (stack trace file)
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@param auto: Set flag (True) to update trace continuously.
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Clear flag (False) to update only if file not exists.
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(Then delete the file to force update.)
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@param interval: In seconds: how often to update the trace file.
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"""
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assert (interval > 0.1)
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self.auto = auto
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self.interval = interval
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self.fpath = os.path.abspath(fpath)
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self.stop_requested = threading.Event()
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threading.Thread.__init__(self)
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def run(self):
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while not self.stop_requested.isSet():
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time.sleep(self.interval)
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if self.auto or not os.path.isfile(self.fpath):
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self.stacktraces()
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def stop(self):
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self.stop_requested.set()
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self.join()
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try:
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if os.path.isfile(self.fpath):
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os.unlink(self.fpath)
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except:
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pass
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def stacktraces(self):
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fout = file(self.fpath, "wb+")
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try:
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fout.write(stacktraces())
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finally:
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fout.close()
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_tracer = None
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def trace_start(fpath, interval=5, auto=True):
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"""Start tracing into the given file."""
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global _tracer
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if _tracer is None:
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_tracer = TraceDumper(fpath, interval, auto)
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_tracer.setDaemon(True)
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_tracer.start()
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else:
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raise Exception("Already tracing to %s" % _tracer.fpath)
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def trace_stop():
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"""Stop tracing."""
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global _tracer
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if _tracer is None:
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raise Exception("Not tracing, cannot stop.")
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else:
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_trace.stop()
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_trace = None
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