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From: Jonathan Gilbert <logic@deltaq.org>
To: "Pratyush Yadav me-at-yadavpratyush.com |GitHub Public/Example
	Allow|"  <172q77k4bxwj0zt@sneakemail.com>
Cc: Jonathan Gilbert via GitGitGadget <gitgitgadget@gmail.com>,
	Git Mailing List <git@vger.kernel.org>,
	Jonathan Gilbert <rcq8n2xf3v@liamekaens.com>,
	Jonathan Gilbert <JonathanG@iqmetrix.com>
Subject: Re: [PATCH 2/2] git-gui: revert untracked files by deleting them
Date: Mon, 4 Nov 2019 11:36:07 -0600
Message-ID: <CAPSOpYtBRvDX4by_k_ViuFN66vKx=WM7zcQ_JXivxApDBOGJ1w@mail.gmail.com> (raw)
In-Reply-To: <20191103074453.56ubga6eitjhp6rf@yadavpratyush.com>

On Sun, Nov 3, 2019 at 1:48 AM Pratyush Yadav me-at-yadavpratyush.com
|GitHub Public/Example Allow| <172q77k4bxwj0zt@sneakemail.com> wrote:
> > +             after idle [list after 0 [list \
> > +                     delete_helper \
> >                       $path_list \
> > -                     [concat $after [list ui_ready]]
> > +                     $path_index \
> > +                     $deletion_errors \
> > +                     $deletion_error_path \
> > +                     $batch_size \
> > +                     ]]
>
> Using `after idle` means in theory we put an undefined maximum time
> limit on the deletion process. Though I suspect in real life it would be
> a pretty short time.
>
> Nonetheless, should you instead do this asynchronously, instead of
> waiting for the event loop to enter an idle state? This means using
> `after 0` directly, instead of doing `after idle [list after 0...`. I
> haven't tested it, but AFAIK this should also keep the UI active while
> not depending on the state of the event loop.
>
> What benefits does your way have over just passing the entire list
> (without batching) to an async script to do processing in the
> background?

I forgot to include this in my point-form list at the end of the
preceding e-mail. What should I be looking into to achieve the same
sort of behaviour, where the UI isn't frozen and the user is getting
period updates about the progress of a large deletion, without using
batches on the UI thread? Is that a thing, or am I misunderstanding
you w.r.t. to doing this asynchronously?

For what it's worth, I used `after idle {after 0 ..}` based on the
recommendation of the Tcler's Wiki [0]:

> An after idle that reschedules itself causes trouble, as the manual warns (PYK 2012-09: the docs no-longer contain this warning, but it still applies):
>
>      At present it is not safe for an idle callback to reschedule itself
>      continuously.  This will interact badly with certain features of
>      Tk that attempt to wait for all idle callbacks to complete.
>      If you would like for an idle callback to reschedule itself
>      continuously, it is better to use a timer handler with a zero
>      timeout period.
>
> Even this warning is oversimplified. Simply scheduling a timer handler with a zero timeout period can mean that the event loop will never be idle, keeping other idle callbacks from firing. The truly safe approach combines both:
>
>     proc doOneStep {} {
>      if { [::sim::one_step] } {
>          after idle [list after 0 doOneStep]
>          #this would work just as well:
>          #after 0 [list after idle doOneStep]
>      }
>      return
>     }
>     sim::init .c 640 480
>     doOneStep
>
> This skeleton should be considered the basic framework for performing long running calculations within a single Tcl interpreter.

Thanks,

Jonathan Gilbert

[0] https://wiki.tcl-lang.org/page/Keep+a+GUI+alive+during+a+long+calculation

  parent reply index

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-30  6:48 [PATCH 0/2] " Jonathan Gilbert via GitGitGadget
2019-10-30  6:48 ` [PATCH 1/2] git-gui: consolidate naming conventions Jonathan Gilbert via GitGitGadget
2019-11-03  0:27   ` Pratyush Yadav
2019-10-30  6:48 ` [PATCH 2/2] git-gui: revert untracked files by deleting them Jonathan Gilbert via GitGitGadget
2019-11-03  7:44   ` Pratyush Yadav
2019-11-04 16:04     ` Jonathan Gilbert
2019-11-04 17:36     ` Jonathan Gilbert [this message]
2019-10-30  9:06 ` [PATCH 0/2] " Bert Wesarg
2019-10-30 17:16   ` Jonathan Gilbert
2019-11-03  1:12     ` Pratyush Yadav
2019-11-03  4:41       ` Jonathan Gilbert
2019-11-03  7:54         ` Pratyush Yadav
2019-11-07  7:05 ` [PATCH v2 " Jonathan Gilbert via GitGitGadget
2019-11-07  7:05   ` [PATCH v2 1/2] git-gui: consolidate naming conventions Jonathan Gilbert via GitGitGadget
2019-11-07  7:05   ` [PATCH v2 2/2] git-gui: revert untracked files by deleting them Jonathan Gilbert via GitGitGadget
2019-11-11 19:25     ` Pratyush Yadav
2019-11-11 21:55       ` Jonathan Gilbert
2019-11-11 22:59         ` Philip Oakley
2019-11-12  4:49           ` Jonathan Gilbert
2019-11-12 10:45             ` Philip Oakley
2019-11-12 16:29               ` Jonathan Gilbert
2019-11-26 11:22                 ` Philip Oakley
2019-11-12 19:35         ` Pratyush Yadav
2019-11-11 19:35   ` [PATCH v2 0/2] " Pratyush Yadav
2019-11-13  9:56   ` [PATCH v3 " Jonathan Gilbert via GitGitGadget
2019-11-13  9:56     ` [PATCH v3 1/2] git-gui: consolidate naming conventions Jonathan Gilbert via GitGitGadget
2019-11-13  9:56     ` [PATCH v3 2/2] git-gui: revert untracked files by deleting them Jonathan Gilbert via GitGitGadget
2019-11-16 15:11       ` Pratyush Yadav
2019-11-16 21:42         ` Jonathan Gilbert
2019-11-17  6:56     ` [PATCH v4 0/2] " Jonathan Gilbert via GitGitGadget
2019-11-17  6:56       ` [PATCH v4 1/2] git-gui: consolidate naming conventions Jonathan Gilbert via GitGitGadget
2019-11-17  6:56       ` [PATCH v4 2/2] git-gui: revert untracked files by deleting them Jonathan Gilbert via GitGitGadget
2019-11-24 13:09         ` Pratyush Yadav
2019-11-19 15:21       ` [PATCH v4 0/2] " Pratyush Yadav
2019-11-19 16:56         ` Jonathan Gilbert
2019-11-24 20:37       ` [PATCH v5 0/3] " Jonathan Gilbert via GitGitGadget
2019-11-24 20:37         ` [PATCH v5 1/3] git-gui: consolidate naming conventions Jonathan Gilbert via GitGitGadget
2019-11-24 20:37         ` [PATCH v5 2/3] git-gui: update status bar to track operations Jonathan Gilbert via GitGitGadget
2019-11-27 21:55           ` Pratyush Yadav
2019-11-28  7:34             ` Jonathan Gilbert
2019-11-24 20:37         ` [PATCH v5 3/3] git-gui: revert untracked files by deleting them Jonathan Gilbert via GitGitGadget
2019-11-27 22:03           ` Pratyush Yadav
2019-11-28  8:30         ` [PATCH v6 0/3] " Jonathan Gilbert via GitGitGadget
2019-11-28  8:30           ` [PATCH v6 1/3] git-gui: consolidate naming conventions Jonathan Gilbert via GitGitGadget
2019-11-28  8:30           ` [PATCH v6 2/3] git-gui: update status bar to track operations Jonathan Gilbert via GitGitGadget
2019-11-30 23:05             ` Pratyush Yadav
2019-12-01  2:12               ` Jonathan Gilbert
2019-12-01 11:43               ` Philip Oakley
2019-12-01 20:09                 ` Jonathan Gilbert
2019-11-28  8:30           ` [PATCH v6 3/3] git-gui: revert untracked files by deleting them Jonathan Gilbert via GitGitGadget
2019-12-01  2:28           ` [PATCH v7 0/3] " Jonathan Gilbert via GitGitGadget
2019-12-01  2:28             ` [PATCH v7 1/3] git-gui: consolidate naming conventions Jonathan Gilbert via GitGitGadget
2019-12-01  2:28             ` [PATCH v7 2/3] git-gui: update status bar to track operations Jonathan Gilbert via GitGitGadget
2020-02-26  8:24               ` Benjamin Poirier
2020-03-02 18:14                 ` Pratyush Yadav
2019-12-01  2:28             ` [PATCH v7 3/3] git-gui: revert untracked files by deleting them Jonathan Gilbert via GitGitGadget
2019-12-05 18:54             ` [PATCH v7 0/3] " Pratyush Yadav

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