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35f0c7a7f9
This commit adds `ThreadPtr{Handle, Holder}` to wrap an `XpCom` object
with thread-safe refcounting. These are analagous to
`nsMainThreadPtr{Handle, Holder}`, but can hold references to
objects from any thread, not just the main thread.
`ThreadPtrHolder` is similar to `ThreadBoundRefPtr`. However, it's
not possible to clone a `ThreadBoundRefPtr`, so it can't be shared
among tasks. This is fine for objects that are only used once, like
callbacks. However, `ThreadBoundRefPtr` doesn't work well for loggers
or event emitters, which might need to be called multiple times on
the owning thread.
Unlike a `ThreadBoundRefPtr`, it's allowed and expected to
clone and drop a `ThreadPtrHolder` on other threads. Internally,
the holder keeps an atomic refcount, and releases the wrapped object
on the owning thread once the count reaches zero.
This commit also changes `TaskRunnable` to support dispatching from
threads other than the main thread.
Differential Revision: https://phabricator.services.mozilla.com/D20074
--HG--
extra : moz-landing-system : lando
31 lines
1.1 KiB
C++
31 lines
1.1 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsProxyRelease.h"
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#include "nsThreadUtils.h"
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namespace detail {
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/* static */ void ProxyReleaseChooser<true>::ProxyReleaseISupports(
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const char* aName, nsIEventTarget* aTarget, nsISupports* aDoomed,
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bool aAlwaysProxy) {
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::detail::ProxyRelease<nsISupports>(aName, aTarget, dont_AddRef(aDoomed),
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aAlwaysProxy);
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}
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} // namespace detail
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extern "C" {
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// This function uses C linkage because it's exposed to Rust to support the
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// `ThreadPtrHolder` wrapper in the `moz_task` crate.
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void NS_ProxyReleaseISupports(const char* aName, nsIEventTarget* aTarget,
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nsISupports* aDoomed, bool aAlwaysProxy) {
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NS_ProxyRelease(aName, aTarget, dont_AddRef(aDoomed), aAlwaysProxy);
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}
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} // extern "C"
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