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

[David M. Cotter]

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?

 

[David M. Cotter]

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