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#!/usr/bin/env python # -*- coding: utf-8 -*- # TOMUSS: The Online Multi User Simple Spreadsheet # Copyright (C) 2009 Thierry EXCOFFIER, Universite Claude Bernard # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA # # Contact: Thierry.EXCOFFIER@bat710.univ-lyon1.fr """ To activate deadlock check, call before any lock creation : start_check_deadlock() """ import threading origLock = None class Lock(object): my_lock = threading.Lock() lock_stacks = {} # Key : Thread, Item : heap of Lock all_the_locks = [] def __init__(self, name=''): self.lock = origLock() self.locked_after = {} self.all_the_locks.append(self) self.name = name def acquire(self, *args): # print 'ACQUIRE', self self.my_lock.acquire() t = threading.currentThread() if t in self.lock_stacks: lock_stack = self.lock_stacks[t] else: lock_stack = self.lock_stacks[t] = [] for lock in lock_stack: if self is not lock: self.locked_after[lock] = True if self in lock.locked_after: print 'SELF:', self print 'LOCK:', lock self.debug() raise ValueError("Possible deadlock") lock_stack.append(self) self.my_lock.release() return self.lock.acquire(*args) def release(self): # print 'RELEASE', self self.my_lock.acquire() self.lock_stacks[threading.currentThread()].pop() self.my_lock.release() self.lock.release() def locked(self): return self.lock.locked() def debug(self): import pprint print '=============================== lock stacks:' print pprint.pformat(self.lock_stacks) print '=============================== the locks:' for i in self.all_the_locks: print 'LOCK:', i, 'IS LOCKED AFTER:' print pprint.pformat(i.locked_after) def __repr__(self): if self.name: return self.name else: return repr(self.lock) def start_check_deadlock(): global origLock origLock = threading.Lock threading.Lock = Lock if __name__ == "__main__": start_check_deadlock() l1 = threading.Lock('L1') l2 = threading.Lock('L2') class T1(threading.Thread): def run(self): l1.acquire() l1.release() l2.acquire() l2.release() class T2(threading.Thread): def run(self): l2.acquire() l2.release() l1.acquire() l1.release() class T3(threading.Thread): def run(self): l1.acquire() l2.acquire() l2.release() l1.release() class T4(threading.Thread): def run(self): try: l2.acquire() l1.acquire() l1.release() l2.release() print('Test3 is BAD: No exception launched') except ValueError: print('Test3 is fine: exception launched') raise t1 = T1() t1.start() t2 = T2() t2.start() t1.join() t2.join() print('Test1 is fine: No exception launched') t3 = T3() t3.start() t3.join() print('Test2 is fine: No exception launched') assert(len(l1.locked_after) == 0) assert(len(l2.locked_after) == 1) t4 = T4() t4.start() t4.join()