symbian-qemu-0.9.1-12/python-2.6.1/Lib/dummy_thread.py
author martin.trojer@nokia.com
Fri, 31 Jul 2009 15:01:17 +0100
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"""Drop-in replacement for the thread module.
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Meant to be used as a brain-dead substitute so that threaded code does
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not need to be rewritten for when the thread module is not present.
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Suggested usage is::
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    try:
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        import thread
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    except ImportError:
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        import dummy_thread as thread
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"""
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# Exports only things specified by thread documentation;
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# skipping obsolete synonyms allocate(), start_new(), exit_thread().
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__all__ = ['error', 'start_new_thread', 'exit', 'get_ident', 'allocate_lock',
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           'interrupt_main', 'LockType']
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import traceback as _traceback
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class error(Exception):
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    """Dummy implementation of thread.error."""
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    def __init__(self, *args):
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        self.args = args
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def start_new_thread(function, args, kwargs={}):
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    """Dummy implementation of thread.start_new_thread().
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    Compatibility is maintained by making sure that ``args`` is a
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    tuple and ``kwargs`` is a dictionary.  If an exception is raised
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    and it is SystemExit (which can be done by thread.exit()) it is
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    caught and nothing is done; all other exceptions are printed out
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    by using traceback.print_exc().
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    If the executed function calls interrupt_main the KeyboardInterrupt will be
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    raised when the function returns.
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    """
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    if type(args) != type(tuple()):
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        raise TypeError("2nd arg must be a tuple")
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    if type(kwargs) != type(dict()):
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        raise TypeError("3rd arg must be a dict")
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    global _main
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    _main = False
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    try:
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        function(*args, **kwargs)
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    except SystemExit:
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        pass
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    except:
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        _traceback.print_exc()
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    _main = True
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    global _interrupt
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    if _interrupt:
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        _interrupt = False
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        raise KeyboardInterrupt
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def exit():
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    """Dummy implementation of thread.exit()."""
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    raise SystemExit
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def get_ident():
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    """Dummy implementation of thread.get_ident().
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    Since this module should only be used when threadmodule is not
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    available, it is safe to assume that the current process is the
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    only thread.  Thus a constant can be safely returned.
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    """
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    return -1
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def allocate_lock():
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    """Dummy implementation of thread.allocate_lock()."""
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    return LockType()
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def stack_size(size=None):
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    """Dummy implementation of thread.stack_size()."""
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    if size is not None:
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        raise error("setting thread stack size not supported")
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    return 0
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class LockType(object):
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    """Class implementing dummy implementation of thread.LockType.
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    Compatibility is maintained by maintaining self.locked_status
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    which is a boolean that stores the state of the lock.  Pickling of
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    the lock, though, should not be done since if the thread module is
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    then used with an unpickled ``lock()`` from here problems could
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    occur from this class not having atomic methods.
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    """
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    def __init__(self):
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        self.locked_status = False
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    def acquire(self, waitflag=None):
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        """Dummy implementation of acquire().
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        For blocking calls, self.locked_status is automatically set to
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        True and returned appropriately based on value of
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        ``waitflag``.  If it is non-blocking, then the value is
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        actually checked and not set if it is already acquired.  This
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        is all done so that threading.Condition's assert statements
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        aren't triggered and throw a little fit.
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        """
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        if waitflag is None or waitflag:
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            self.locked_status = True
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            return True
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        else:
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            if not self.locked_status:
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                self.locked_status = True
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                return True
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            else:
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                return False
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    __enter__ = acquire
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    def __exit__(self, typ, val, tb):
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        self.release()
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    def release(self):
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        """Release the dummy lock."""
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        # XXX Perhaps shouldn't actually bother to test?  Could lead
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        #     to problems for complex, threaded code.
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        if not self.locked_status:
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            raise error
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        self.locked_status = False
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        return True
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    def locked(self):
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        return self.locked_status
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# Used to signal that interrupt_main was called in a "thread"
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_interrupt = False
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# True when not executing in a "thread"
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_main = True
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def interrupt_main():
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    """Set _interrupt flag to True to have start_new_thread raise
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    KeyboardInterrupt upon exiting."""
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    if _main:
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        raise KeyboardInterrupt
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    else:
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        global _interrupt
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        _interrupt = True