Re: [MACTCL] Tk in thread on MacOS

[Jim I. <ji...@ap...>]

You are not supposed to use AppKit (underlying Tk on macOS) on anything but the main thread.  The Xcode team even added a "Main Thread Checker" tool in the latest version of Xcode to flag uses of AppKit not on the main thread:

https://developer.apple.com/documentation/code_diagnostics/main_thread_checker

Jim


> On Dec 1, 2017, at 6:03 AM, Programmingkid <pro...@gm...> wrote:
> 
>> 
>> On Dec 1, 2017, at 1:30 AM, Steve Landers <st...@di...> wrote:
>> 
>> Should Tk work in a thread on MacOS ?
>> 
>> The following script works on Linux and Windows, but not MacOS the toplevel window resizes but the label doesn’t appear.
>> 
>> I can’t find any documentation that says it shouldn’t work.   
>> package require Thread
>> set id [thread::create]
>> thread::send $id {
>> package require Tk
>> label .l1 -text "This is a label"
>> grid configure .l1
>> }
>> 
>> It seems the grid is the problem, because I can see the label widget exists.  Replacing grid with a pack doesn’t fix it.
>> 
>> Can anyone shed some light?
>> 
>> —Steve
> 
> It is common for GUI frameworks to only want to use the main thread for all their GUI work.
> 
> When I tried out your code in wish I saw the label, so it works for me. Only when I tried quitting the application an exception occurred.
> 
> My info:
> TK 8.5.9
> Mac OS 10.12.6 
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