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"""Thread module emulating a subset of Java's threading model.""" import sys as _sys try: import thread except ImportError: del _sys.modules[__name__] raise import warnings from collections import deque as _deque from itertools import count as _count from time import time as _time, sleep as _sleep from traceback import format_exc as _format_exc # Note regarding PEP 8 compliant aliases # This threading model was originally inspired by Java, and inherited # the convention of camelCase function and method names from that # language. While those names are not in any imminent danger of being # deprecated, starting with Python 2.6, the module now provides a # PEP 8 compliant alias for any such method name. # Using the new PEP 8 compliant names also facilitates substitution # with the multiprocessing module, which doesn't provide the old # Java inspired names. # Rename some stuff so "from threading import *" is safe __all__ = ['activeCount', 'active_count', 'Condition', 'currentThread', 'current_thread', 'enumerate', 'Event', 'Lock', 'RLock', 'Semaphore', 'BoundedSemaphore', 'Thread', 'Timer', 'setprofile', 'settrace', 'local', 'stack_size'] _start_new_thread = thread.start_new_thread _allocate_lock = thread.allocate_lock _get_ident = thread.get_ident ThreadError = thread.error del thread # sys.exc_clear is used to work around the fact that except blocks # don't fully clear the exception until 3.0. warnings.filterwarnings('ignore', category=DeprecationWarning, module='threading', message='sys.exc_clear') # Debug support (adapted from ihooks.py). # All the major classes here derive from _Verbose. We force that to # be a new-style class so that all the major classes here are new-style. # This helps debugging (type(instance) is more revealing for instances # of new-style classes). _VERBOSE = False if __debug__: class _Verbose(object): def __init__(self, verbose=None): if verbose is None: verbose = _VERBOSE self.__verbose = verbose def _note(self, format, *args): if self.__verbose: format = format % args # Issue #4188: calling current_thread() can incur an infinite # recursion if it has to create a DummyThread on the fly. ident = _get_ident() try: name = _active[ident].name except KeyError: name = "
" % ident format = "%s: %s\n" % (name, format) _sys.stderr.write(format) else: # Disable this when using "python -O" class _Verbose(object): def __init__(self, verbose=None): pass def _note(self, *args): pass # Support for profile and trace hooks _profile_hook = None _trace_hook = None def setprofile(func): """Set a profile function for all threads started from the threading module. The func will be passed to sys.setprofile() for each thread, before its run() method is called. """ global _profile_hook _profile_hook = func def settrace(func): """Set a trace function for all threads started from the threading module. The func will be passed to sys.settrace() for each thread, before its run() method is called. """ global _trace_hook _trace_hook = func # Synchronization classes Lock = _allocate_lock def RLock(*args, **kwargs): """Factory function that returns a new reentrant lock. A reentrant lock must be released by the thread that acquired it. Once a thread has acquired a reentrant lock, the same thread may acquire it again without blocking; the thread must release it once for each time it has acquired it. """ return _RLock(*args, **kwargs) class _RLock(_Verbose): """A reentrant lock must be released by the thread that acquired it. Once a thread has acquired a reentrant lock, the same thread may acquire it again without blocking; the thread must release it once for each time it has acquired it. """ def __init__(self, verbose=None): _Verbose.__init__(self, verbose) self.__block = _allocate_lock() self.__owner = None self.__count = 0 def __repr__(self): owner = self.__owner try: owner = _active[owner].name except KeyError: pass return "<%s owner=%r count=%d>" % ( self.__class__.__name__, owner, self.__count) def acquire(self, blocking=1): """Acquire a lock, blocking or non-blocking. When invoked without arguments: if this thread already owns the lock, increment the recursion level by one, and return immediately. Otherwise, if another thread owns the lock, block until the lock is unlocked. Once the lock is unlocked (not owned by any thread), then grab ownership, set the recursion level to one, and return. If more than one thread is blocked waiting until the lock is unlocked, only one at a time will be able to grab ownership of the lock. There is no return value in this case. When invoked with the blocking argument set to true, do the same thing as when called without arguments, and return true. When invoked with the blocking argument set to false, do not block. If a call without an argument would block, return false immediately; otherwise, do the same thing as when called without arguments, and return true. """ me = _get_ident() if self.__owner == me: self.__count = self.__count + 1 if __debug__: self._note("%s.acquire(%s): recursive success", self, blocking) return 1 rc = self.__block.acquire(blocking) if rc: self.__owner = me self.__count = 1 if __debug__: self._note("%s.acquire(%s): initial success", self, blocking) else: if __debug__: self._note("%s.acquire(%s): failure", self, blocking) return rc __enter__ = acquire def release(self): """Release a lock, decrementing the recursion level. If after the decrement it is zero, reset the lock to unlocked (not owned by any thread), and if any other threads are blocked waiting for the lock to become unlocked, allow exactly one of them to proceed. If after the decrement the recursion level is still nonzero, the lock remains locked and owned by the calling thread. Only call this method when the calling thread owns the lock. A RuntimeError is raised if this method is called when the lock is unlocked. There is no return value. """ if self.__owner != _get_ident(): raise RuntimeError("cannot release un-acquired lock") self.__count = count = self.__count - 1 if not count: self.__owner = None self.__block.release() if __debug__: self._note("%s.release(): final release", self) else: if __debug__: self._note("%s.release(): non-final release", self) def __exit__(self, t, v, tb): self.release() # Internal methods used by condition variables def _acquire_restore(self, count_owner): count, owner = count_owner self.__block.acquire() self.__count = count self.__owner = owner if __debug__: self._note("%s._acquire_restore()", self) def _release_save(self): if __debug__: self._note("%s._release_save()", self) count = self.__count self.__count = 0 owner = self.__owner self.__owner = None self.__block.release() return (count, owner) def _is_owned(self): return self.__owner == _get_ident() def Condition(*args, **kwargs): """Factory function that returns a new condition variable object. A condition variable allows one or more threads to wait until they are notified by another thread. If the lock argument is given and not None, it must be a Lock or RLock object, and it is used as the underlying lock. Otherwise, a new RLock object is created and used as the underlying lock. """ return _Condition(*args, **kwargs) class _Condition(_Verbose): """Condition variables allow one or more threads to wait until they are notified by another thread. """ def __init__(self, lock=None, verbose=None): _Verbose.__init__(self, verbose) if lock is None: lock = RLock() self.__lock = lock # Export the lock's acquire() and release() methods self.acquire = lock.acquire self.release = lock.release # If the lock defines _release_save() and/or _acquire_restore(), # these override the default implementations (which just call # release() and acquire() on the lock). Ditto for _is_owned(). try: self._release_save = lock._release_save except AttributeError: pass try: self._acquire_restore = lock._acquire_restore except AttributeError: pass try: self._is_owned = lock._is_owned except AttributeError: pass self.__waiters = [] def __enter__(self): return self.__lock.__enter__() def __exit__(self, *args): return self.__lock.__exit__(*args) def __repr__(self): return "
" % (self.__lock, len(self.__waiters)) def _release_save(self): self.__lock.release() # No state to save def _acquire_restore(self, x): self.__lock.acquire() # Ignore saved state def _is_owned(self): # Return True if lock is owned by current_thread. # This method is called only if __lock doesn't have _is_owned(). if self.__lock.acquire(0): self.__lock.release() return False else: return True def wait(self, timeout=None): """Wait until notified or until a timeout occurs. If the calling thread has not acquired the lock when this method is called, a RuntimeError is raised. This method releases the underlying lock, and then blocks until it is awakened by a notify() or notifyAll() call for the same condition variable in another thread, or until the optional timeout occurs. Once awakened or timed out, it re-acquires the lock and returns. When the timeout argument is present and not None, it should be a floating point number specifying a timeout for the operation in seconds (or fractions thereof). When the underlying lock is an RLock, it is not released using its release() method, since this may not actually unlock the lock when it was acquired multiple times recursively. Instead, an internal interface of the RLock class is used, which really unlocks it even when it has been recursively acquired several times. Another internal interface is then used to restore the recursion level when the lock is reacquired. """ if not self._is_owned(): raise RuntimeError("cannot wait on un-acquired lock") waiter = _allocate_lock() waiter.acquire() self.__waiters.append(waiter) saved_state = self._release_save() try: # restore state no matter what (e.g., KeyboardInterrupt) if timeout is None: waiter.acquire() if __debug__: self._note("%s.wait(): got it", self) else: # Balancing act: We can't afford a pure busy loop, so we # have to sleep; but if we sleep the whole timeout time, # we'll be unresponsive. The scheme here sleeps very # little at first, longer as time goes on, but never longer # than 20 times per second (or the timeout time remaining). endtime = _time() + timeout delay = 0.0005 # 500 us -> initial delay of 1 ms while True: gotit = waiter.acquire(0) if gotit: break remaining = endtime - _time() if remaining <= 0: break delay = min(delay * 2, remaining, .05) _sleep(delay) if not gotit: if __debug__: self._note("%s.wait(%s): timed out", self, timeout) try: self.__waiters.remove(waiter) except ValueError: pass else: if __debug__: self._note("%s.wait(%s): got it", self, timeout) finally: self._acquire_restore(saved_state) def notify(self, n=1): """Wake up one or more threads waiting on this condition, if any. If the calling thread has not acquired the lock when this method is called, a RuntimeError is raised. This method wakes up at most n of the threads waiting for the condition variable; it is a no-op if no threads are waiting. """ if not self._is_owned(): raise RuntimeError("cannot notify on un-acquired lock") __waiters = self.__waiters waiters = __waiters[:n] if not waiters: if __debug__: self._note("%s.notify(): no waiters", self) return self._note("%s.notify(): notifying %d waiter%s", self, n, n!=1 and "s" or "") for waiter in waiters: waiter.release() try: __waiters.remove(waiter) except ValueError: pass def notifyAll(self): """Wake up all threads waiting on this condition. If the calling thread has not acquired the lock when this method is called, a RuntimeError is raised. """ self.notify(len(self.__waiters)) notify_all = notifyAll def Semaphore(*args, **kwargs): """A factory function that returns a new semaphore. Semaphores manage a counter representing the number of release() calls minus the number of acquire() calls, plus an initial value. The acquire() method blocks if necessary until it can return without making the counter negative. If not given, value defaults to 1. """ return _Semaphore(*args, **kwargs) class _Semaphore(_Verbose): """Semaphores manage a counter representing the number of release() calls minus the number of acquire() calls, plus an initial value. The acquire() method blocks if necessary until it can return without making the counter negative. If not given, value defaults to 1. """ # After Tim Peters' semaphore class, but not quite the same (no maximum) def __init__(self, value=1, verbose=None): if value < 0: raise ValueError("semaphore initial value must be >= 0") _Verbose.__init__(self, verbose) self.__cond = Condition(Lock()) self.__value = value def acquire(self, blocking=1): """Acquire a semaphore, decrementing the internal counter by one. When invoked without arguments: if the internal counter is larger than zero on entry, decrement it by one and return immediately. If it is zero on entry, block, waiting until some other thread has called release() to make it larger than zero. This is done with proper interlocking so that if multiple acquire() calls are blocked, release() will wake exactly one of them up. The implementation may pick one at random, so the order in which blocked threads are awakened should not be relied on. There is no return value in this case. When invoked with blocking set to true, do the same thing as when called without arguments, and return true. When invoked with blocking set to false, do not block. If a call without an argument would block, return false immediately; otherwise, do the same thing as when called without arguments, and return true. """ rc = False with self.__cond: while self.__value == 0: if not blocking: break if __debug__: self._note("%s.acquire(%s): blocked waiting, value=%s", self, blocking, self.__value) self.__cond.wait() else: self.__value = self.__value - 1 if __debug__: self._note("%s.acquire: success, value=%s", self, self.__value) rc = True return rc __enter__ = acquire def release(self): """Release a semaphore, incrementing the internal counter by one. When the counter is zero on entry and another thread is waiting for it to become larger than zero again, wake up that thread. """ with self.__cond: self.__value = self.__value + 1 if __debug__: self._note("%s.release: success, value=%s", self, self.__value) self.__cond.notify() def __exit__(self, t, v, tb): self.release() def BoundedSemaphore(*args, **kwargs): """A factory function that returns a new bounded semaphore. A bounded semaphore checks to make sure its current value doesn't exceed its initial value. If it does, ValueError is raised. In most situations semaphores are used to guard resources with limited capacity. If the semaphore is released too many times it's a sign of a bug. If not given, value defaults to 1. Like regular semaphores, bounded semaphores manage a counter representing the number of release() calls minus the number of acquire() calls, plus an initial value. The acquire() method blocks if necessary until it can return without making the counter negative. If not given, value defaults to 1. """ return _BoundedSemaphore(*args, **kwargs) class _BoundedSemaphore(_Semaphore): """A bounded semaphore checks to make sure its current value doesn't exceed its initial value. If it does, ValueError is raised. In most situations semaphores are used to guard resources with limited capacity. """ def __init__(self, value=1, verbose=None): _Semaphore.__init__(self, value, verbose) self._initial_value = value def release(self): """Release a semaphore, incrementing the internal counter by one. When the counter is zero on entry and another thread is waiting for it to become larger than zero again, wake up that thread. If the number of releases exceeds the number of acquires, raise a ValueError. """ with self._Semaphore__cond: if self._Semaphore__value >= self._initial_value: raise ValueError("Semaphore released too many times") self._Semaphore__value += 1 self._Semaphore__cond.notify() def Event(*args, **kwargs): """A factory function that returns a new event. Events manage a flag that can be set to true with the set() method and reset to false with the clear() method. The wait() method blocks until the flag is true. """ return _Event(*args, **kwargs) class _Event(_Verbose): """A factory function that returns a new event object. An event manages a flag that can be set to true with the set() method and reset to false with the clear() method. The wait() method blocks until the flag is true. """ # After Tim Peters' event class (without is_posted()) def __init__(self, verbose=None): _Verbose.__init__(self, verbose) self.__cond = Condition(Lock()) self.__flag = False def _reset_internal_locks(self): # private! called by Thread._reset_internal_locks by _after_fork() self.__cond.__init__(Lock()) def isSet(self): 'Return true if and only if the internal flag is true.' return self.__flag is_set = isSet def set(self): """Set the internal flag to true. All threads waiting for the flag to become true are awakened. Threads that call wait() once the flag is true will not block at all. """ with self.__cond: self.__flag = True self.__cond.notify_all() def clear(self): """Reset the internal flag to false. Subsequently, threads calling wait() will block until set() is called to set the internal flag to true again. """ with self.__cond: self.__flag = False def wait(self, timeout=None): """Block until the internal flag is true. If the internal flag is true on entry, return immediately. Otherwise, block until another thread calls set() to set the flag to true, or until the optional timeout occurs. When the timeout argument is present and not None, it should be a floating point number specifying a timeout for the operation in seconds (or fractions thereof). This method returns the internal flag on exit, so it will always return True except if a timeout is given and the operation times out. """ with self.__cond: if not self.__flag: self.__cond.wait(timeout) return self.__flag # Helper to generate new thread names _counter = _count().next _counter() # Consume 0 so first non-main thread has id 1. def _newname(template="Thread-%d"): return template % _counter() # Active thread administration _active_limbo_lock = _allocate_lock() _active = {} # maps thread id to Thread object _limbo = {} # Main class for threads class Thread(_Verbose): """A class that represents a thread of control. This class can be safely subclassed in a limited fashion. """ __initialized = False # Need to store a reference to sys.exc_info for printing # out exceptions when a thread tries to use a global var. during interp. # shutdown and thus raises an exception about trying to perform some # operation on/with a NoneType __exc_info = _sys.exc_info # Keep sys.exc_clear too to clear the exception just before # allowing .join() to return. __exc_clear = _sys.exc_clear def __init__(self, group=None, target=None, name=None, args=(), kwargs=None, verbose=None): """This constructor should always be called with keyword arguments. Arguments are: *group* should be None; reserved for future extension when a ThreadGroup class is implemented. *target* is the callable object to be invoked by the run() method. Defaults to None, meaning nothing is called. *name* is the thread name. By default, a unique name is constructed of the form "Thread-N" where N is a small decimal number. *args* is the argument tuple for the target invocation. Defaults to (). *kwargs* is a dictionary of keyword arguments for the target invocation. Defaults to {}. If a subclass overrides the constructor, it must make sure to invoke the base class constructor (Thread.__init__()) before doing anything else to the thread. """ assert group is None, "group argument must be None for now" _Verbose.__init__(self, verbose) if kwargs is None: kwargs = {} self.__target = target self.__name = str(name or _newname()) self.__args = args self.__kwargs = kwargs self.__daemonic = self._set_daemon() self.__ident = None self.__started = Event() self.__stopped = False self.__block = Condition(Lock()) self.__initialized = True # sys.stderr is not stored in the class like # sys.exc_info since it can be changed between instances self.__stderr = _sys.stderr def _reset_internal_locks(self): # private! Called by _after_fork() to reset our internal locks as # they may be in an invalid state leading to a deadlock or crash. if hasattr(self, '_Thread__block'): # DummyThread deletes self.__block self.__block.__init__() self.__started._reset_internal_locks() @property def _block(self): # used by a unittest return self.__block def _set_daemon(self): # Overridden in _MainThread and _DummyThread return current_thread().daemon def __repr__(self): assert self.__initialized, "Thread.__init__() was not called" status = "initial" if self.__started.is_set(): status = "started" if self.__stopped: status = "stopped" if self.__daemonic: status += " daemon" if self.__ident is not None: status += " %s" % self.__ident return "<%s(%s, %s)>" % (self.__class__.__name__, self.__name, status) def start(self): """Start the thread's activity. It must be called at most once per thread object. It arranges for the object's run() method to be invoked in a separate thread of control. This method will raise a RuntimeError if called more than once on the same thread object. """ if not self.__initialized: raise RuntimeError("thread.__init__() not called") if self.__started.is_set(): raise RuntimeError("threads can only be started once") if __debug__: self._note("%s.start(): starting thread", self) with _active_limbo_lock: _limbo[self] = self try: _start_new_thread(self.__bootstrap, ()) except Exception: with _active_limbo_lock: del _limbo[self] raise self.__started.wait() def run(self): """Method representing the thread's activity. You may override this method in a subclass. The standard run() method invokes the callable object passed to the object's constructor as the target argument, if any, with sequential and keyword arguments taken from the args and kwargs arguments, respectively. """ try: if self.__target: self.__target(*self.__args, **self.__kwargs) finally: # Avoid a refcycle if the thread is running a function with # an argument that has a member that points to the thread. del self.__target, self.__args, self.__kwargs def __bootstrap(self): # Wrapper around the real bootstrap code that ignores # exceptions during interpreter cleanup. Those typically # happen when a daemon thread wakes up at an unfortunate # moment, finds the world around it destroyed, and raises some # random exception *** while trying to report the exception in # __bootstrap_inner() below ***. Those random exceptions # don't help anybody, and they confuse users, so we suppress # them. We suppress them only when it appears that the world # indeed has already been destroyed, so that exceptions in # __bootstrap_inner() during normal business hours are properly # reported. Also, we only suppress them for daemonic threads; # if a non-daemonic encounters this, something else is wrong. try: self.__bootstrap_inner() except: if self.__daemonic and _sys is None: return raise def _set_ident(self): self.__ident = _get_ident() def __bootstrap_inner(self): try: self._set_ident() self.__started.set() with _active_limbo_lock: _active[self.__ident] = self del _limbo[self] if __debug__: self._note("%s.__bootstrap(): thread started", self) if _trace_hook: self._note("%s.__bootstrap(): registering trace hook", self) _sys.settrace(_trace_hook) if _profile_hook: self._note("%s.__bootstrap(): registering profile hook", self) _sys.setprofile(_profile_hook) try: self.run() except SystemExit: if __debug__: self._note("%s.__bootstrap(): raised SystemExit", self) except: if __debug__: self._note("%s.__bootstrap(): unhandled exception", self) # If sys.stderr is no more (most likely from interpreter # shutdown) use self.__stderr. Otherwise still use sys (as in # _sys) in case sys.stderr was redefined since the creation of # self. if _sys and _sys.stderr is not None: print>>_sys.stderr, ("Exception in thread %s:\n%s" % (self.name, _format_exc())) elif self.__stderr is not None: # Do the best job possible w/o a huge amt. of code to # approximate a traceback (code ideas from # Lib/traceback.py) exc_type, exc_value, exc_tb = self.__exc_info() try: print>>self.__stderr, ( "Exception in thread " + self.name + " (most likely raised during interpreter shutdown):") print>>self.__stderr, ( "Traceback (most recent call last):") while exc_tb: print>>self.__stderr, ( ' File "%s", line %s, in %s' % (exc_tb.tb_frame.f_code.co_filename, exc_tb.tb_lineno, exc_tb.tb_frame.f_code.co_name)) exc_tb = exc_tb.tb_next print>>self.__stderr, ("%s: %s" % (exc_type, exc_value)) # Make sure that exc_tb gets deleted since it is a memory # hog; deleting everything else is just for thoroughness finally: del exc_type, exc_value, exc_tb else: if __debug__: self._note("%s.__bootstrap(): normal return", self) finally: # Prevent a race in # test_threading.test_no_refcycle_through_target when # the exception keeps the target alive past when we # assert that it's dead. self.__exc_clear() finally: with _active_limbo_lock: self.__stop() try: # We don't call self.__delete() because it also # grabs _active_limbo_lock. del _active[_get_ident()] except: pass def __stop(self): # DummyThreads delete self.__block, but they have no waiters to # notify anyway (join() is forbidden on them). if not hasattr(self, '_Thread__block'): return self.__block.acquire() self.__stopped = True self.__block.notify_all() self.__block.release() def __delete(self): "Remove current thread from the dict of currently running threads." # Notes about running with dummy_thread: # # Must take care to not raise an exception if dummy_thread is being # used (and thus this module is being used as an instance of # dummy_threading). dummy_thread.get_ident() always returns -1 since # there is only one thread if dummy_thread is being used. Thus # len(_active) is always <= 1 here, and any Thread instance created # overwrites the (if any) thread currently registered in _active. # # An instance of _MainThread is always created by 'threading'. This # gets overwritten the instant an instance of Thread is created; both # threads return -1 from dummy_thread.get_ident() and thus have the # same key in the dict. So when the _MainThread instance created by # 'threading' tries to clean itself up when atexit calls this method # it gets a KeyError if another Thread instance was created. # # This all means that KeyError from trying to delete something from # _active if dummy_threading is being used is a red herring. But # since it isn't if dummy_threading is *not* being used then don't # hide the exception. try: with _active_limbo_lock: del _active[_get_ident()] # There must not be any python code between the previous line # and after the lock is released. Otherwise a tracing function # could try to acquire the lock again in the same thread, (in # current_thread()), and would block. except KeyError: if 'dummy_threading' not in _sys.modules: raise def join(self, timeout=None): """Wait until the thread terminates. This blocks the calling thread until the thread whose join() method is called terminates -- either normally or through an unhandled exception or until the optional timeout occurs. When the timeout argument is present and not None, it should be a floating point number specifying a timeout for the operation in seconds (or fractions thereof). As join() always returns None, you must call isAlive() after join() to decide whether a timeout happened -- if the thread is still alive, the join() call timed out. When the timeout argument is not present or None, the operation will block until the thread terminates. A thread can be join()ed many times. join() raises a RuntimeError if an attempt is made to join the current thread as that would cause a deadlock. It is also an error to join() a thread before it has been started and attempts to do so raises the same exception. """ if not self.__initialized: raise RuntimeError("Thread.__init__() not called") if not self.__started.is_set(): raise RuntimeError("cannot join thread before it is started") if self is current_thread(): raise RuntimeError("cannot join current thread") if __debug__: if not self.__stopped: self._note("%s.join(): waiting until thread stops", self) self.__block.acquire() try: if timeout is None: while not self.__stopped: self.__block.wait() if __debug__: self._note("%s.join(): thread stopped", self) else: deadline = _time() + timeout while not self.__stopped: delay = deadline - _time() if delay <= 0: if __debug__: self._note("%s.join(): timed out", self) break self.__block.wait(delay) else: if __debug__: self._note("%s.join(): thread stopped", self) finally: self.__block.release() @property def name(self): """A string used for identification purposes only. It has no semantics. Multiple threads may be given the same name. The initial name is set by the constructor. """ assert self.__initialized, "Thread.__init__() not called" return self.__name @name.setter def name(self, name): assert self.__initialized, "Thread.__init__() not called" self.__name = str(name) @property def ident(self): """Thread identifier of this thread or None if it has not been started. This is a nonzero integer. See the thread.get_ident() function. Thread identifiers may be recycled when a thread exits and another thread is created. The identifier is available even after the thread has exited. """ assert self.__initialized, "Thread.__init__() not called" return self.__ident def isAlive(self): """Return whether the thread is alive. This method returns True just before the run() method starts until just after the run() method terminates. The module function enumerate() returns a list of all alive threads. """ assert self.__initialized, "Thread.__init__() not called" return self.__started.is_set() and not self.__stopped is_alive = isAlive @property def daemon(self): """A boolean value indicating whether this thread is a daemon thread (True) or not (False). This must be set before start() is called, otherwise RuntimeError is raised. Its initial value is inherited from the creating thread; the main thread is not a daemon thread and therefore all threads created in the main thread default to daemon = False. The entire Python program exits when no alive non-daemon threads are left. """ assert self.__initialized, "Thread.__init__() not called" return self.__daemonic @daemon.setter def daemon(self, daemonic): if not self.__initialized: raise RuntimeError("Thread.__init__() not called") if self.__started.is_set(): raise RuntimeError("cannot set daemon status of active thread"); self.__daemonic = daemonic def isDaemon(self): return self.daemon def setDaemon(self, daemonic): self.daemon = daemonic def getName(self): return self.name def setName(self, name): self.name = name # The timer class was contributed by Itamar Shtull-Trauring def Timer(*args, **kwargs): """Factory function to create a Timer object. Timers call a function after a specified number of seconds: t = Timer(30.0, f, args=[], kwargs={}) t.start() t.cancel() # stop the timer's action if it's still waiting """ return _Timer(*args, **kwargs) class _Timer(Thread): """Call a function after a specified number of seconds: t = Timer(30.0, f, args=[], kwargs={}) t.start() t.cancel() # stop the timer's action if it's still waiting """ def __init__(self, interval, function, args=[], kwargs={}): Thread.__init__(self) self.interval = interval self.function = function self.args = args self.kwargs = kwargs self.finished = Event() def cancel(self): """Stop the timer if it hasn't finished yet""" self.finished.set() def run(self): self.finished.wait(self.interval) if not self.finished.is_set(): self.function(*self.args, **self.kwargs) self.finished.set() # Special thread class to represent the main thread # This is garbage collected through an exit handler class _MainThread(Thread): def __init__(self): Thread.__init__(self, name="MainThread") self._Thread__started.set() self._set_ident() with _active_limbo_lock: _active[_get_ident()] = self def _set_daemon(self): return False def _exitfunc(self): self._Thread__stop() t = _pickSomeNonDaemonThread() if t: if __debug__: self._note("%s: waiting for other threads", self) while t: t.join() t = _pickSomeNonDaemonThread() if __debug__: self._note("%s: exiting", self) self._Thread__delete() def _pickSomeNonDaemonThread(): for t in enumerate(): if not t.daemon and t.is_alive(): return t return None # Dummy thread class to represent threads not started here. # These aren't garbage collected when they die, nor can they be waited for. # If they invoke anything in threading.py that calls current_thread(), they # leave an entry in the _active dict forever after. # Their purpose is to return *something* from current_thread(). # They are marked as daemon threads so we won't wait for them # when we exit (conform previous semantics). class _DummyThread(Thread): def __init__(self): Thread.__init__(self, name=_newname("Dummy-%d")) # Thread.__block consumes an OS-level locking primitive, which # can never be used by a _DummyThread. Since a _DummyThread # instance is immortal, that's bad, so release this resource. del self._Thread__block self._Thread__started.set() self._set_ident() with _active_limbo_lock: _active[_get_ident()] = self def _set_daemon(self): return True def join(self, timeout=None): assert False, "cannot join a dummy thread" # Global API functions def currentThread(): """Return the current Thread object, corresponding to the caller's thread of control. If the caller's thread of control was not created through the threading module, a dummy thread object with limited functionality is returned. """ try: return _active[_get_ident()] except KeyError: ##print "current_thread(): no current thread for", _get_ident() return _DummyThread() current_thread = currentThread def activeCount(): """Return the number of Thread objects currently alive. The returned count is equal to the length of the list returned by enumerate(). """ with _active_limbo_lock: return len(_active) + len(_limbo) active_count = activeCount def _enumerate(): # Same as enumerate(), but without the lock. Internal use only. return _active.values() + _limbo.values() def enumerate(): """Return a list of all Thread objects currently alive. The list includes daemonic threads, dummy thread objects created by current_thread(), and the main thread. It excludes terminated threads and threads that have not yet been started. """ with _active_limbo_lock: return _active.values() + _limbo.values() from thread import stack_size # Create the main thread object, # and make it available for the interpreter # (Py_Main) as threading._shutdown. _shutdown = _MainThread()._exitfunc # get thread-local implementation, either from the thread # module, or from the python fallback try: from thread import _local as local except ImportError: from _threading_local import local def _after_fork(): # This function is called by Python/ceval.c:PyEval_ReInitThreads which # is called from PyOS_AfterFork. Here we cleanup threading module state # that should not exist after a fork. # Reset _active_limbo_lock, in case we forked while the lock was held # by another (non-forked) thread. http://bugs.python.org/issue874900 global _active_limbo_lock _active_limbo_lock = _allocate_lock() # fork() only copied the current thread; clear references to others. new_active = {} current = current_thread() with _active_limbo_lock: for thread in _enumerate(): # Any lock/condition variable may be currently locked or in an # invalid state, so we reinitialize them. if hasattr(thread, '_reset_internal_locks'): thread._reset_internal_locks() if thread is current: # There is only one active thread. We reset the ident to # its new value since it can have changed. ident = _get_ident() thread._Thread__ident = ident new_active[ident] = thread else: # All the others are already stopped. thread._Thread__stop() _limbo.clear() _active.clear() _active.update(new_active) assert len(_active) == 1 # Self-test code def _test(): class BoundedQueue(_Verbose): def __init__(self, limit): _Verbose.__init__(self) self.mon = RLock() self.rc = Condition(self.mon) self.wc = Condition(self.mon) self.limit = limit self.queue = _deque() def put(self, item): self.mon.acquire() while len(self.queue) >= self.limit: self._note("put(%s): queue full", item) self.wc.wait() self.queue.append(item) self._note("put(%s): appended, length now %d", item, len(self.queue)) self.rc.notify() self.mon.release() def get(self): self.mon.acquire() while not self.queue: self._note("get(): queue empty") self.rc.wait() item = self.queue.popleft() self._note("get(): got %s, %d left", item, len(self.queue)) self.wc.notify() self.mon.release() return item class ProducerThread(Thread): def __init__(self, queue, quota): Thread.__init__(self, name="Producer") self.queue = queue self.quota = quota def run(self): from random import random counter = 0 while counter < self.quota: counter = counter + 1 self.queue.put("%s.%d" % (self.name, counter)) _sleep(random() * 0.00001) class ConsumerThread(Thread): def __init__(self, queue, count): Thread.__init__(self, name="Consumer") self.queue = queue self.count = count def run(self): while self.count > 0: item = self.queue.get() print item self.count = self.count - 1 NP = 3 QL = 4 NI = 5 Q = BoundedQueue(QL) P = [] for i in range(NP): t = ProducerThread(Q, NI) t.name = ("Producer-%d" % (i+1)) P.append(t) C = ConsumerThread(Q, NI*NP) for t in P: t.start() _sleep(0.000001) C.start() for t in P: t.join() C.join() if __name__ == '__main__': _test()
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