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Diffstat (limited to 'dom/plugins/ipc/PPluginBackgroundDestroyer.ipdl')
-rw-r--r-- | dom/plugins/ipc/PPluginBackgroundDestroyer.ipdl | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/dom/plugins/ipc/PPluginBackgroundDestroyer.ipdl b/dom/plugins/ipc/PPluginBackgroundDestroyer.ipdl new file mode 100644 index 000000000..cc8ff558e --- /dev/null +++ b/dom/plugins/ipc/PPluginBackgroundDestroyer.ipdl @@ -0,0 +1,37 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- + * vim: sw=4 ts=8 et : + */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +include protocol PPluginInstance; + +namespace mozilla { +namespace plugins { + +/** + * This protocol exists to allow us to correctly destroy background + * surfaces. The browser owns the surfaces, but shares a "reference" + * with the plugin. The browser needs to notify the plugin when the + * background is going to be destroyed, but it can't rely on the + * plugin to destroy it because the plugin may crash at any time. So + * the plugin instance relinquishes destruction of the its old + * background to actors of this protocol, which can deal with crashy + * corner cases more easily than the instance. + */ +protocol PPluginBackgroundDestroyer { + manager PPluginInstance; + + // The ctor message for this protocol serves double-duty as + // notification that that the background is stale. + +parent: + async __delete__(); + +state DESTROYING: + recv __delete__; +}; + +} // namespace plugins +} // namespace mozilla |