d749c1f081
This adds a new XPCOM type which will hold the `UniqueContentParentKeepAlive` internally, and can be returned into Chrome JS using a new method on ChromeUtils.sys.mjs. The KeepAlive will be cleaned up when the cycle-collected JS object is destroyed, or when the `invalidateKeepAlive()` method is called on the object (for times when JS wants to take more direct control over the lifecycle of the KeepAlive). In the future it would be possible to add methods to e.g. get a KeepAlive for a specific existing process, or clone a KeepAlive object, however that is not required for the initial use-case. This will be used in part 2 to replace the use of hidden iframes with dummy pages to create the "inference" content process. Differential Revision: https://phabricator.services.mozilla.com/D234906
50 lines
1.8 KiB
C++
50 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_UniqueContentParentKeepAlive_h
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#define mozilla_dom_UniqueContentParentKeepAlive_h
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#include "mozilla/RefPtr.h"
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#include "mozilla/UniquePtr.h"
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#include "nsIDOMProcessParent.h"
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namespace mozilla::dom {
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class ContentParent;
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class ThreadsafeContentParentHandle;
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struct ContentParentKeepAliveDeleter {
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void operator()(ContentParent* aProcess);
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void operator()(ThreadsafeContentParentHandle* aHandle);
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uint64_t mBrowserId = 0;
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};
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// Helper for managing a ContentParent combined with the KeepAlive which is
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// keeping it alive for use by a specific BrowserId.
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//
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// This generally should not be created directly, but rather should be created
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// using `ContentParent::AddKeepAlive`.
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using UniqueContentParentKeepAlive =
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UniquePtr<ContentParent, ContentParentKeepAliveDeleter>;
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using UniqueThreadsafeContentParentKeepAlive =
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UniquePtr<ThreadsafeContentParentHandle, ContentParentKeepAliveDeleter>;
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UniqueContentParentKeepAlive UniqueContentParentKeepAliveFromThreadsafe(
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UniqueThreadsafeContentParentKeepAlive aKeepAlive);
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UniqueThreadsafeContentParentKeepAlive UniqueContentParentKeepAliveToThreadsafe(
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UniqueContentParentKeepAlive aKeepAlive);
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// Wrap a UniqueContentParentKeepAlive to make it usable from JS.
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//
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// Should not be called on a KeepAlive for a still-launching ContentParent.
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already_AddRefed<nsIContentParentKeepAlive> WrapContentParentKeepAliveForJS(
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UniqueContentParentKeepAlive aKeepAlive);
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} // namespace mozilla::dom
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#endif // mozilla_dom_UniqueContentParentKeepAlive_h
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