1 # Copyright (C) 2011 Google Inc. All rights reserved. 2 # 3 # Redistribution and use in source and binary forms, with or without 4 # modification, are permitted provided that the following conditions are 5 # met: 6 # 7 # * Redistributions of source code must retain the above copyright 8 # notice, this list of conditions and the following disclaimer. 9 # * Redistributions in binary form must reproduce the above 10 # copyright notice, this list of conditions and the following disclaimer 11 # in the documentation and/or other materials provided with the 12 # distribution. 13 # * Neither the name of Google Inc. nor the names of its 14 # contributors may be used to endorse or promote products derived from 15 # this software without specific prior written permission. 16 # 17 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29 """Simple routines for logging, obtaining thread stack information.""" 30 31 import sys 32 import traceback 33 34 35 def log_thread_state(logger, name, thread_id, msg=''): 36 """Log information about the given thread state.""" 37 stack = _find_thread_stack(thread_id) 38 assert(stack is not None) 39 logger("") 40 logger("%s (tid %d) %s" % (name, thread_id, msg)) 41 _log_stack(logger, stack) 42 logger("") 43 44 45 def _find_thread_stack(thread_id): 46 """Returns a stack object that can be used to dump a stack trace for 47 the given thread id (or None if the id is not found).""" 48 for tid, stack in sys._current_frames().items(): 49 if tid == thread_id: 50 return stack 51 return None 52 53 54 def _log_stack(logger, stack): 55 """Log a stack trace to the logger callback.""" 56 for filename, lineno, name, line in traceback.extract_stack(stack): 57 logger('File: "%s", line %d, in %s' % (filename, lineno, name)) 58 if line: 59 logger(' %s' % line.strip()) 60 61 62 def log_traceback(logger, tb): 63 stack = traceback.extract_tb(tb) 64 for frame_str in traceback.format_list(stack): 65 for line in frame_str.split('\n'): 66 if line: 67 logger(" %s" % line) 68
