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sudancam
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usr
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lib64
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python2.7
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dummy_thread.py
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"""Drop-in replacement for the thread module. 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'] import traceback as _traceback class error(Exception): """Dummy implementation of thread.error.""" def __init__(self, *args): self.args = args 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: _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 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): """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: 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 # 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
/home/sudancam/../../usr/./lib64/./python2.7/dummy_thread.py