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From fb0a5265ec9d83b56563769cc1b756aeca42ce65 Mon Sep 17 00:00:00 2001
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From: Georges Basile Stavracas Neto <gbsneto@gnome.org>
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Date: Thu, 27 May 2021 20:02:53 -0300
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Subject: [PATCH 20/40] Client: Always destroy frame callback in the actual
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callback
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It's good hygiene to destroy all frame callbacks. Destroy the
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frame callback and cleanup the mFrameCallback class member in
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the callback itself. The callback destruction happens before
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calling handleFrameCallback() to avoid the theoretical case
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where another frame callback is queued by handleFrameCallback(),
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and then immediately destroyed in the callback handler.
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* asturmlechner 2021-09-27:
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Conflict resolved from non-backported commit in dev branch:
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93058de8d7e7c2f320c22b3bd898aa06cf5babcd
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Change-Id: Ide6dc95e3402932c58bfc088a9d471fda821e9a1
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Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
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(cherry picked from commit 42cdc61a93cf2acb09936aebb5e431fdbc0a26c6)
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---
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src/client/qwaylandwindow.cpp | 11 +++++------
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1 file changed, 5 insertions(+), 6 deletions(-)
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diff --git a/src/client/qwaylandwindow.cpp b/src/client/qwaylandwindow.cpp
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index 85307875..c020a58f 100644
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--- a/src/client/qwaylandwindow.cpp
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+++ b/src/client/qwaylandwindow.cpp
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@@ -622,9 +622,13 @@ void QWaylandWindow::commit()
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const wl_callback_listener QWaylandWindow::callbackListener = {
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[](void *data, wl_callback *callback, uint32_t time) {
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- Q_UNUSED(callback);
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Q_UNUSED(time);
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auto *window = static_cast<QWaylandWindow*>(data);
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+
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+ Q_ASSERT(callback == window->mFrameCallback);
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+ wl_callback_destroy(callback);
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+ window->mFrameCallback = nullptr;
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+
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window->handleFrameCallback();
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}
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};
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@@ -1179,11 +1183,6 @@ void QWaylandWindow::handleUpdate()
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if (!mSurface)
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return;
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- if (mFrameCallback) {
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- wl_callback_destroy(mFrameCallback);
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- mFrameCallback = nullptr;
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- }
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-
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QMutexLocker locker(mFrameQueue.mutex);
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struct ::wl_surface *wrappedSurface = reinterpret_cast<struct ::wl_surface *>(wl_proxy_create_wrapper(mSurface->object()));
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wl_proxy_set_queue(reinterpret_cast<wl_proxy *>(wrappedSurface), mFrameQueue.queue);
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--
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2.35.1
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