[Webkit-unassigned] [Bug 175855] [GTK] Segfault on WebView run_javascript() function from Python thread

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=175855

Michael Catanzaro <mcatanzaro at igalia.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #3 from Michael Catanzaro <mcatanzaro at igalia.com> ---
I can reproduce. It works fine with Fedora's 2.16.6 but fails with trunk built in JHBuild. It's interesting that the behavior changed from one WebKit version to the next, but your code is illegal and it's just luck that it ever worked. You can't use GTK+ except on the thread you initialized it on (usually the main thread), because it's not threadsafe. Same goes for WebKit and most GNOME-related libraries. It might work on your computer, but users could be getting crashes or weird problems. The fix is to post actions you want to take to the main thread, e.g. using GLib.idle_add. For example:

def run_js(i):
    webkit.run_javascript("window.alert('It works!')")
    print("Successfully ran Javascript!")
    return GLib.SOURCE_REMOVE

# Now create a thread
def threaded_function():
    print("Sleeping on thread for 2 seconds")
    sleep(2)
    print("Going to run Javascript...")
    GLib.idle_add(run_js, None)

That works without crashing for me. Hope that helps.

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