simon-git: puzzles (main): Simon Tatham

[Commits to Tartarus hosted VCS]

TL;DR:
  77866e1 wasm/js/emscripten: Fix page loading race

Repository:     https://git.tartarus.org/simon/puzzles.git
On the web:     https://git.tartarus.org/?p=simon/puzzles.git
Branch updated: main
Committer:      Simon Tatham <anakin at pobox.com>
Date:           2021-04-22 21:35:53

commit 77866e1335bd1ea7189f11c19ff2947be17aa517
web diff https://git.tartarus.org/?p=simon/puzzles.git;a=commitdiff;h=77866e1335bd1ea7189f11c19ff2947be17aa517;hp=56ef86f92b77412bfe27d7206d25b323475e71fe
Author: Ian Jackson <ijackson at chiark.greenend.org.uk>
Date:   Thu Apr 22 19:20:32 2021 +0100

    wasm/js/emscripten: Fix page loading race
    
    Using a stunt webserver which artificially introduces a 3s delay just
    before the last line of the HTML output, I have reproduced a
    uwer-reported loading/startup race bug:
    
    Previously the wasm loading was started by the <script> element,
    synchronously. If the wasm loading is fast, and finishes before the
    HTML loading, the onRuntimeInitialized event may occur before
    initPuzzles.  But initPuzzles sets up the event handler.
    
    Fix this bug, and introduce a new comment containing an argument for
    the correctness of the new approach.
    
    Signed-off-by: Ian Jackson <ijackson at chiark.greenend.org.uk>

 cmake/platforms/emscripten.cmake |  1 +
 emccpost.js                      |  1 +
 emccpre.js                       | 45 ++++++++++++++++++++++++++++++++++++++++
 html/jspage.pl                   |  4 ++--
 4 files changed, 49 insertions(+), 2 deletions(-)