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"""Some globals used by the main Shell classes.
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"""
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#-----------------------------------------------------------------------------
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# Module imports
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#-----------------------------------------------------------------------------
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# stdlib
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import inspect
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import thread
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try:
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import ctypes
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HAS_CTYPES = True
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except ImportError:
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HAS_CTYPES = False
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# our own
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from IPython.genutils import Term,warn,error,flag_calls, ask_yes_no
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#-----------------------------------------------------------------------------
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# Globals
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#-----------------------------------------------------------------------------
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# global flag to pass around information about Ctrl-C without exceptions
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KBINT = False
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# global flag to turn on/off Tk support.
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USE_TK = False
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# ID for the main thread, used for cross-thread exceptions
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MAIN_THREAD_ID = thread.get_ident()
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# Tag when runcode() is active, for exception handling
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CODE_RUN = None
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#-----------------------------------------------------------------------------
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# This class is trivial now, but I want to have it in to publish a clean
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# interface. Later when the internals are reorganized, code that uses this
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# shouldn't have to change.
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if HAS_CTYPES:
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# Add async exception support. Trick taken from:
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# http://sebulba.wikispaces.com/recipe+thread2
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def _async_raise(tid, exctype):
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"""raises the exception, performs cleanup if needed"""
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if not inspect.isclass(exctype):
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raise TypeError("Only types can be raised (not instances)")
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res = ctypes.pythonapi.PyThreadState_SetAsyncExc(tid,
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ctypes.py_object(exctype))
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if res == 0:
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raise ValueError("invalid thread id")
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elif res != 1:
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# """if it returns a number greater than one, you're in trouble,
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# and you should call it again with exc=NULL to revert the effect"""
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ctypes.pythonapi.PyThreadState_SetAsyncExc(tid, 0)
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raise SystemError("PyThreadState_SetAsyncExc failed")
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def sigint_handler (signum,stack_frame):
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"""Sigint handler for threaded apps.
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This is a horrible hack to pass information about SIGINT _without_
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using exceptions, since I haven't been able to properly manage
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cross-thread exceptions in GTK/WX. In fact, I don't think it can be
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done (or at least that's my understanding from a c.l.py thread where
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this was discussed)."""
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global KBINT
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if CODE_RUN:
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_async_raise(MAIN_THREAD_ID,KeyboardInterrupt)
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else:
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KBINT = True
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print '\nKeyboardInterrupt - Press <Enter> to continue.',
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Term.cout.flush()
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else:
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def sigint_handler (signum,stack_frame):
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"""Sigint handler for threaded apps.
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This is a horrible hack to pass information about SIGINT _without_
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using exceptions, since I haven't been able to properly manage
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cross-thread exceptions in GTK/WX. In fact, I don't think it can be
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done (or at least that's my understanding from a c.l.py thread where
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this was discussed)."""
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global KBINT
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print '\nKeyboardInterrupt - Press <Enter> to continue.',
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Term.cout.flush()
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# Set global flag so that runsource can know that Ctrl-C was hit
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KBINT = True
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def run_in_frontend(src):
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""" Check if source snippet can be run in the REPL thread, as opposed to
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GUI mainloop (to prevent unnecessary hanging of mainloop).
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"""
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if src.startswith('_ip.system(') and not '\n' in src:
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return True
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return False
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