1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dom/plugins/ipc/PPluginBackgroundDestroyer.ipdl Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,37 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: sw=4 ts=8 et :
1.6 + */
1.7 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.8 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.9 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.10 +
1.11 +include protocol PPluginInstance;
1.12 +
1.13 +namespace mozilla {
1.14 +namespace plugins {
1.15 +
1.16 +/**
1.17 + * This protocol exists to allow us to correctly destroy background
1.18 + * surfaces. The browser owns the surfaces, but shares a "reference"
1.19 + * with the plugin. The browser needs to notify the plugin when the
1.20 + * background is going to be destroyed, but it can't rely on the
1.21 + * plugin to destroy it because the plugin may crash at any time. So
1.22 + * the plugin instance relinquishes destruction of the its old
1.23 + * background to actors of this protocol, which can deal with crashy
1.24 + * corner cases more easily than the instance.
1.25 + */
1.26 +protocol PPluginBackgroundDestroyer {
1.27 + manager PPluginInstance;
1.28 +
1.29 + // The ctor message for this protocol serves double-duty as
1.30 + // notification that that the background is stale.
1.31 +
1.32 +parent:
1.33 + __delete__();
1.34 +
1.35 +state DESTROYING:
1.36 + recv __delete__;
1.37 +};
1.38 +
1.39 +} // namespace plugins
1.40 +} // namespace mozilla
