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112f1594bf
This patch adds `RunOnShutdown`, which allows the caller to supply any callable to be invoked during the specified shutdown phase. This allows us to do more than just clear smart pointers without needing to write a bunch of observer service boilerplate. We use `std::function` to hold the callable. Differential Revision: https://phabricator.services.mozilla.com/D41816 --HG-- extra : moz-landing-system : lando
62 lines
2.3 KiB
C++
62 lines
2.3 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 "mozilla/ClearOnShutdown.h"
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namespace mozilla {
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namespace ClearOnShutdown_Internal {
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Array<StaticAutoPtr<ShutdownList>,
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static_cast<size_t>(ShutdownPhase::ShutdownPhase_Length)>
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sShutdownObservers;
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ShutdownPhase sCurrentShutdownPhase = ShutdownPhase::NotInShutdown;
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void InsertIntoShutdownList(ShutdownObserver* aObserver, ShutdownPhase aPhase) {
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// Adding a ClearOnShutdown for a "past" phase is an error.
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if (!(static_cast<size_t>(sCurrentShutdownPhase) <
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static_cast<size_t>(aPhase))) {
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MOZ_ASSERT(false, "ClearOnShutdown for phase that already was cleared");
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aObserver->Shutdown();
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delete aObserver;
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return;
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}
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if (!(sShutdownObservers[static_cast<size_t>(aPhase)])) {
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sShutdownObservers[static_cast<size_t>(aPhase)] = new ShutdownList();
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}
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sShutdownObservers[static_cast<size_t>(aPhase)]->insertBack(aObserver);
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}
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} // namespace ClearOnShutdown_Internal
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// Called when XPCOM is shutting down, after all shutdown notifications have
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// been sent and after all threads' event loops have been purged.
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void KillClearOnShutdown(ShutdownPhase aPhase) {
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using namespace ClearOnShutdown_Internal;
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MOZ_ASSERT(NS_IsMainThread());
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// Shutdown only goes one direction...
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MOZ_ASSERT(static_cast<size_t>(sCurrentShutdownPhase) <
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static_cast<size_t>(aPhase));
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// It's impossible to add an entry for a "past" phase; this is blocked in
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// ClearOnShutdown, but clear them out anyways in case there are phases
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// that weren't passed to KillClearOnShutdown.
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for (size_t phase = static_cast<size_t>(ShutdownPhase::First);
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phase <= static_cast<size_t>(aPhase); phase++) {
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if (sShutdownObservers[static_cast<size_t>(phase)]) {
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while (ShutdownObserver* observer =
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sShutdownObservers[static_cast<size_t>(phase)]->popFirst()) {
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observer->Shutdown();
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delete observer;
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}
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sShutdownObservers[static_cast<size_t>(phase)] = nullptr;
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}
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}
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}
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} // namespace mozilla
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