Stop freezing Main thread

[Ksengine]

can we stop freezing main thread.
Its working with gtk and qt.
not working on windows MSHTML
Cocoa not tested.

We can do it with multiprocessing.

[r0x0r]

Are you suggesting to run GUI loop as a separate process and keep the main thread of the main process free?

[Ksengine]

yes,
you added multiproessing as an argument of start method
but not supported yet

[Ksengine]

I can help

[r0x0r]

The original multiprocessing idea was to use internally processes instead of threads. But I like your approach more. Feel free to go ahead with implementation. The parameter name could be `webview.start(block=True)`. The default value is True by default to keep it backward compatibility.

[Ksengine]

ok i will add this feature

[Ksengine]

can you add labels to this issue

[r0x0r]

One consideration that should be decided is the exit logic. Normally the program exits after the gui loop ends but with a non-blocking gui what would be the default logic? With a non-blocking user code what is the behaviour after the code finishes executing?

[Ksengine]

Two methods

program exits after code is executed(kills the gui loop)
ex:

wait = webview.start(block = False, daemon = False)
print("Free main thread")
# process killed

if no other code to run program exits after the gui loop ends
ex:

...
wait = webview.start(block = False)
print("Free main thread")
wait()

---

** how it works? **

start(
...
    # p is our extra process
    p.daemon=True
    wait = p.join()
    return wait

[Ksengine]

can you add labels to this issue

what is your reply?

[r0x0r]

I like the join syntax, as it is inline with the Python API. Let's name the parameter daemon instead of block and make start return a process object in the daemon mode. ie.

process = webview.start(daemon=True)
do_stuff()
process.join()
# app is exited after this

We need to think of a way to signal the gui process to quit after the join, as it would not happen automatically.

[Ksengine]

i added my pull request.
sorry, i hadn't read your last reply
so i added both daemon and block methods
but they are different
i copied from #632

• multiprocessing added
• fixed threading
• added two keyword arguments to start method
  • block(default : True)
  • daemon(default : True)(works if block is False)

ex(block):-

import webview
w = webview.create_window("ssss","https://www.google.com")
join = webview.start(block=False) # set block option to False( default:True )
print('free main thread')
# Some code
print('blocked main thread')
join() # join gui loop to main thread
print('free main thread') # this line works after gui loop ended

ex(block without join):-

import webview
w = webview.create_window("ssss","https://www.google.com")
join = webview.start(block=False) # set block option to False( default:True )
print('free main thread')
# Some code
# program exits when no any code run and gui loop ended

ex(daemon):-

import webview
w = webview.create_window("ssss","https://www.google.com")
join = webview.start(block=False, daemon=False) # set daemon option to False( default:True )
print('free main thread')
# Some code
 # gui loop stops and exit program

[Ksengine]

can we update docs and examples