Thomas Haller 0be672e1e0 gobject: preserve weak notifications registered during dispose
We call g_object_weak_release_all() at two places.

Once right before finalize(). At this point, the object is definitely
going to be destroyed, and the user must no longer resurrect it or
subscribe new weak notifications. In that case, we really want to
notify/release all weak notifications.

However, we also call it from g_object_real_dispose(). During dispose,
the API allows the user to resurrect an object. Granted, that is
probably not something anybody should do, but GObject makes a reasonable
attempt to support that.

A possible place to resurrect (and subscribe new weak notifications) is
when GObject calls g_object_real_dispose().

  static void
  g_object_real_dispose (GObject *object)
  {
    g_signal_handlers_destroy (object);

    /* GWeakNotify and GClosure can call into user code */
    g_object_weak_release_all (object);
    closure_array_destroy_all (object);
  }

But previously, g_object_weak_release_all() would continue iterating
until there are no more weak notifications left. So while the user can
take a strong reference and resurrect the object, their attempts to
register new weak notifications are thwarted.

Instead, when the loop in g_object_weak_release_all() starts, remember
the initial number of weak notifications, and don't release more than
that. Note that WeakRefStack preserves the order of entries, so by
maintaining the "remaining_to_notify" counter we know when to stop.

Note that this brings also an earlier behavior back, where we would call

  g_datalist_id_set_data (&object->qdata, quark_weak_notifies, NULL);

This would take out the entire WeakRefStack at once and notify the weak
notifications registered at the time. But subsequent registrations would
not be released/notified yet.
2025-05-07 21:29:37 +00:00
2023-07-30 17:03:07 +04:00
2025-04-24 19:29:27 +00:00
2019-11-21 14:03:01 -06:00
2021-10-28 14:47:53 +01:00
2024-10-18 14:59:20 +08:00
2025-04-03 15:38:51 +01:00
2024-08-29 08:58:36 +01:00

GLib

GLib is the low-level core library that forms the basis for projects such as GTK and GNOME. It provides data structure handling for C, portability wrappers, and interfaces for such runtime functionality as an event loop, threads, dynamic loading, and an object system.

The official download locations are: https://download.gnome.org/sources/glib

The official web site is: https://www.gtk.org/

Installation

See the file INSTALL.md. There is separate and more in-depth documentation for building GLib on Windows.

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See SECURITY.md for more details.

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API documentation is available online for GLib for the:

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  • Information about your system. For instance:
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    • And anything else you think is relevant.
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    • If you can reproduce it with one of the test programs that are built in the tests/ subdirectory, that will be most convenient. Otherwise, please include a short test program that exhibits the behavior. As a last resort, you can also provide a pointer to a larger piece of software that can be downloaded.
  • If the bug was a crash, the exact text that was printed out when the crash occurred.
  • Further information such as stack traces may be useful, but is not necessary.

Contributing to GLib

Please follow the contribution guide to know how to start contributing to GLib.

Patches should be submitted as merge requests to gitlab.gnome.org. Note that you will need to be logged in to the site to use this page. If the patch fixes an existing issue, please refer to the issue in your commit message with the following notation (for issue 123):

Closes: #123

Otherwise, create a new merge request that introduces the change. Filing a separate issue is not required.

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Low-level core library that forms the basis for projects such as GTK+ and GNOME.
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