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Meant to be used as a brain-dead substitute so that threaded code does not need to be rewritten for when the thread module is not present. Suggested usage is:: try: import _thread except ImportError: import _dummy_thread as _thread """ # Exports only things specified by thread documentation; # skipping obsolete synonyms allocate(), start_new(), exit_thread(). __all__ = ['error', 'start_new_thread', 'exit', 'get_ident', 'allocate_lock', 'interrupt_main', 'LockType', 'RLock'] # A dummy value TIMEOUT_MAX = 2**31 # NOTE: this module can be imported early in the extension building process, # and so top level imports of other modules should be avoided. Instead, all # imports are done when needed on a function-by-function basis. Since threads # are disabled, the import lock should not be an issue anyway (??). error = RuntimeError def start_new_thread(function, args, kwargs={}): """Dummy implementation of _thread.start_new_thread(). Compatibility is maintained by making sure that ``args`` is a tuple and ``kwargs`` is a dictionary. If an exception is raised and it is SystemExit (which can be done by _thread.exit()) it is caught and nothing is done; all other exceptions are printed out by using traceback.print_exc(). If the executed function calls interrupt_main the KeyboardInterrupt will be raised when the function returns. """ if type(args) != type(tuple()): raise TypeError("2nd arg must be a tuple") if type(kwargs) != type(dict()): raise TypeError("3rd arg must be a dict") global _main _main = False try: function(*args, **kwargs) except SystemExit: pass except: import traceback traceback.print_exc() _main = True global _interrupt if _interrupt: _interrupt = False raise KeyboardInterrupt def exit(): """Dummy implementation of _thread.exit().""" raise SystemExit def get_ident(): """Dummy implementation of _thread.get_ident(). Since this module should only be used when _threadmodule is not available, it is safe to assume that the current process is the only thread. Thus a constant can be safely returned. """ return 1 def allocate_lock(): """Dummy implementation of _thread.allocate_lock().""" return LockType() def stack_size(size=None): """Dummy implementation of _thread.stack_size().""" if size is not None: raise error("setting thread stack size not supported") return 0 def _set_sentinel(): """Dummy implementation of _thread._set_sentinel().""" return LockType() class LockType(object): """Class implementing dummy implementation of _thread.LockType. Compatibility is maintained by maintaining self.locked_status which is a boolean that stores the state of the lock. Pickling of the lock, though, should not be done since if the _thread module is then used with an unpickled ``lock()`` from here problems could occur from this class not having atomic methods. """ def __init__(self): self.locked_status = False def acquire(self, waitflag=None, timeout=-1): """Dummy implementation of acquire(). For blocking calls, self.locked_status is automatically set to True and returned appropriately based on value of ``waitflag``. If it is non-blocking, then the value is actually checked and not set if it is already acquired. This is all done so that threading.Condition's assert statements aren't triggered and throw a little fit. """ if waitflag is None or waitflag: self.locked_status = True return True else: if not self.locked_status: self.locked_status = True return True else: if timeout > 0: import time time.sleep(timeout) return False __enter__ = acquire def __exit__(self, typ, val, tb): self.release() def release(self): """Release the dummy lock.""" # XXX Perhaps shouldn't actually bother to test? Could lead # to problems for complex, threaded code. if not self.locked_status: raise error self.locked_status = False return True def locked(self): return self.locked_status def __repr__(self): return "<%s %s.%s object at %s>" % ( "locked" if self.locked_status else "unlocked", self.__class__.__module__, self.__class__.__qualname__, hex(id(self)) ) class RLock(LockType): """Dummy implementation of threading._RLock. Re-entrant lock can be aquired multiple times and needs to be released just as many times. This dummy implemention does not check wheter the current thread actually owns the lock, but does accounting on the call counts. """ def __init__(self): super().__init__() self._levels = 0 def acquire(self, waitflag=None, timeout=-1): """Aquire the lock, can be called multiple times in succession. """ locked = super().acquire(waitflag, timeout) if locked: self._levels += 1 return locked def release(self): """Release needs to be called once for every call to acquire(). """ if self._levels == 0: raise error if self._levels == 1: super().release() self._levels -= 1 # Used to signal that interrupt_main was called in a "thread" _interrupt = False # True when not executing in a "thread" _main = True def interrupt_main(): """Set _interrupt flag to True to have start_new_thread raise KeyboardInterrupt upon exiting.""" if _main: raise KeyboardInterrupt else: global _interrupt _interrupt = True