Re: status of fileevent support? (for use with Tcl::pTk)

I use a variation on 
https://www.nntp.perl.org/group/perl.tcltk/2011/03/msg524.html
with filrevents in tkx to read from sockets. i use it to read from 
http sourced ports as well as stock sockets.

i dont have a simple example right now.

At 07:31 AM 7/29/2018, you wrote:

>(Continuing discussion from 
><https://github.com/gisle/tcl.pm/issues/14>https://github.com/gisle/tcl.pm/issues/14 
>here per Vadim's suggestion)
>
>>
>>
>><https://github.com/chrstphrchvz>chrstphrchvz commented Jul 11, 
>>2018, 3:06 PM CDT:
>>
>>
>>>I came across an issue using fileevent from Tcl::pTk on macOS, 
>>>which I've documented here: 
>>><https://rt.cpan.org/Ticket/Display.html?id=125662>https://rt.cpan.org/Ticket/Display.html?id=125662
>>>
>>>I noticed there's comments in 
>>><https://metacpan.org/source/CERNEY/Tcl-pTk-0.92/lib/Tcl/pTk/Widget.pm#L2109>Tcl::pTk's 
>>>fileevent suggesting it be rewritten, since it has known 
>>>shortcomings (e.g. only supporting 'readable', relies on polling 
>>>interval). Another suggestion it makes is for Tcl.pm to support 
>>>CreateFileHandler.
>>>But do Tcl::Tk and/or Tkx already allow using fileevent 'as-is' 
>>>through Tcl.pm? (I haven't yet successfully tried; is there a 
>>>readily available example somewhere?) If that's the case, then I'm 
>>>wondering if it's a matter of making Tcl::pTk recognize fileevent 
>>>as something it should just pass through to Tcl.pm if it's syntax 
>>>is sufficiently compatible with Perl/Tk's.
>
>
><https://github.com/vadrer>vadrer commented Jul 12, 2018, 2:46 AM CDT:
>
>
>
>>I haven't tried tcl/tk's fileevent, and actually I have no much 
>>plans on doing so.
>>The reason is that I mostly use tcl/tk for GUI, and perl for IO;
>>
>>however it is possible to use tcl/tk's fileevent, but in this case 
>>we should expect for it to perform said IO.
>>problem with Tcl::pTk could be that it should "join" perl IO and 
>>tcl/tk IO; which is not very easy, plus I do not foresee much 
>>benefits from doing so.
>
>
>For the program I'm working on (cf. 
><https://github.com/hotwolf/HSW12/issues/16>https://github.com/hotwolf/HSW12/issues/16) 
>the existing fileevent is for reading a serial port. It already uses 
>separate read and write filehandles; it might be sufficient to use 
>Tcl syntax to open a read handle for the device and make a fileevent 
>for it (from Tcl rather than Perl), while continuing to use a Perl 
>write filehandle in UI event callbacks.
>
>For other uses, I'm not quite sure what the best approach will be. 
>It doesn't seem possible to use some modern module like IO::Async in 
>the same thread with e.g. Tcl::pTk due to separate event loops. If 
>combining the file handles is best, that seems like something 
>needing to be done from C/XS (not pure Perl or Tcl), which is what 
>using Tcl_CreateFileHandler would entail.