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                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;">&quot;&quot;&quot;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

&quot;&quot;&quot;
# Exports only things specified by thread documentation;
# skipping obsolete synonyms allocate(), start_new(), exit_thread().
__all__ = [&#039;error&#039;, &#039;start_new_thread&#039;, &#039;exit&#039;, &#039;get_ident&#039;, &#039;allocate_lock&#039;,
           &#039;interrupt_main&#039;, &#039;LockType&#039;]

# 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={}):
    &quot;&quot;&quot;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.

    &quot;&quot;&quot;
    if type(args) != type(tuple()):
        raise TypeError(&quot;2nd arg must be a tuple&quot;)
    if type(kwargs) != type(dict()):
        raise TypeError(&quot;3rd arg must be a dict&quot;)
    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():
    &quot;&quot;&quot;Dummy implementation of _thread.exit().&quot;&quot;&quot;
    raise SystemExit

def get_ident():
    &quot;&quot;&quot;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.
    &quot;&quot;&quot;
    return -1

def allocate_lock():
    &quot;&quot;&quot;Dummy implementation of _thread.allocate_lock().&quot;&quot;&quot;
    return LockType()

def stack_size(size=None):
    &quot;&quot;&quot;Dummy implementation of _thread.stack_size().&quot;&quot;&quot;
    if size is not None:
        raise error(&quot;setting thread stack size not supported&quot;)
    return 0

def _set_sentinel():
    &quot;&quot;&quot;Dummy implementation of _thread._set_sentinel().&quot;&quot;&quot;
    return LockType()

class LockType(object):
    &quot;&quot;&quot;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.

    &quot;&quot;&quot;

    def __init__(self):
        self.locked_status = False

    def acquire(self, waitflag=None, timeout=-1):
        &quot;&quot;&quot;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&#039;s assert statements
        aren&#039;t triggered and throw a little fit.

        &quot;&quot;&quot;
        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 &gt; 0:
                    import time
                    time.sleep(timeout)
                return False

    __enter__ = acquire

    def __exit__(self, typ, val, tb):
        self.release()

    def release(self):
        &quot;&quot;&quot;Release the dummy lock.&quot;&quot;&quot;
        # XXX Perhaps shouldn&#039;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 &quot;&lt;%s %s.%s object at %s&gt;&quot; % (
            &quot;locked&quot; if self.locked_status else &quot;unlocked&quot;,
            self.__class__.__module__,
            self.__class__.__qualname__,
            hex(id(self))
        )

# Used to signal that interrupt_main was called in a &quot;thread&quot;
_interrupt = False
# True when not executing in a &quot;thread&quot;
_main = True

def interrupt_main():
    &quot;&quot;&quot;Set _interrupt flag to True to have start_new_thread raise
    KeyboardInterrupt upon exiting.&quot;&quot;&quot;
    if _main:
        raise KeyboardInterrupt
    else:
        global _interrupt
        _interrupt = True
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