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embedding: how to create an "idle" handler to allow user to kill scripts?

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  embedding: how to create an "idle" handler to allow user to kill scripts? "David M. Cotter" <me@davecotter.com> - 2013-07-28 12:21 -0700
    Re: embedding: how to create an "idle" handler to allow user to kill scripts? "David M. Cotter" <me@davecotter.com> - 2013-07-30 12:56 -0700

#51400 — embedding: how to create an "idle" handler to allow user to kill scripts?

in my C++ app, on the main thread i init python, init threads, then call PyEval_SaveThread(), since i'm not going to do any more python on the main thread.

then when the user invokes a script, i launch a preemptive thread (boost::threads), and from there, i have this:

	static int		CB_S_Idle(void *in_thiz) {
		CT_RunScript		*thiz((CT_RunScript *)in_thiz);
		
		return thiz->Idle();
	}
	
	int			Idle()
	{
		int		resultI = 0;
		OSStatus	err = noErr;
		
		ERR(i_taskRecP->MT_UpdateData(&i_progData));
		
		if (err) {
			resultI = -1;
		}
		
		ERR(ScheduleIdleCall());
		return err;
	}
	
	int			ScheduleIdleCall()
	{
		int		resultI(Py_AddPendingCall(CB_S_Idle, this));
		CFAbsoluteTime	timeT(CFAbsoluteTimeGetCurrent());
		SuperString	str; str.Set(timeT, SS_Time_LOG);
		
		Logf("$$$ Python idle: (%d) %s\n", resultI, str.utf8Z());
		return resultI;
	}
	
	virtual	OSStatus	operator()(OSStatus err) {
		ScPyGILState		sc;

		ERR(ScheduleIdleCall());
		ERR(PyRun_SimpleString(i_script.utf8Z()));
		return err;
	}

so, my operator() gets called, and i try to schedule an Idle call, which succeeds, then i run my script.  however, the CB_S_Idle() never gets called?

the MT_UpdateData() function returns an error if the user had canceled the script

must i schedule a run-loop on the main thread or something to get it to be called?

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#51601

Okay, i'm really surprised nobody knows how to do this.  and frankly i'm amazed at the utter lack of documentation.  but i've figured it out, and it's all working beautifully.

if you want the code, go here:
http://karaoke.kjams.com/wiki/Python

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