So when a user selects File->Quit, a SIGTERM should be generated? It doesn't trigger the on_unix_signal(), whereas hitting Control-C does.
I think for now, I am going to regard auto-saving widget states as unreliable. Instead, I will keep anything that ought to be saved in vars, which don't disappear on me. On 3/3/13, Michael Haberler <[email protected]> wrote: > > Am 03.03.2013 um 13:45 schrieb andy pugh: > >> On 3 March 2013 07:39, Michael Haberler <[email protected]> wrote: >> >>> I have looked into the issue in the past, more with an eye towards fast >>> estop, and the gist was: if it is too work fast, the shutdown sequence >>> must be aware of the hardware it is using; for instance, the fastest, >>> lowest-impact method to shutdown a Mesa card was to remove the watchdog >>> function from the thread which got the time windows down to a watchdog >>> period. So shutdown is fast or portable, tick either one. It is not an >>> issue which can be solved en passant with a quick fix; it needs a bit of >>> a plan and some systematic work which doesnt immediately yield results. >> >> This is considering the process that happens when LinuxCNC is exited >> with a machine powered-up and running? I can see this is a type of >> e-stop, but not the normal sort. > > Right > >> Is it possible to refuse to quit until at least one servo cycle has >> run with the LinuxCNC enable outputs disabled? > > the current sequence is in scripts/linuxcnc function Cleanup: > > it sends signals to all user processes (UI, task etc) ; first SIGTERM, later > SIGKILL if a process wont exit > then it stops the realtime threads via halcmd stop > then it proceeds to unload hal_lib, rtapi and modules and cleans up > > If anything happens before threads are stopped really depends on what user > processes are doing and if/how they react to a signal > > what I was referring to: if you react to the shutdown signal (or a segfault > for that matter) in one of the user processes, that potentially reduces the > time window until threads are stopped, and there is some choice what still > can be done - provided safe signal programming techniques are used > > I'd need to look if any components actually react in HAL due to a signal > directly; cant remember having seen it > > -m > > > ------------------------------------------------------------------------------ > Everyone hates slow websites. So do we. > Make your web apps faster with AppDynamics > Download AppDynamics Lite for free today: > http://p.sf.net/sfu/appdyn_d2d_feb > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
