116 lines
3.7 KiB
C++
116 lines
3.7 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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#include "mozilla/dom/quota/ClientDirectoryLockHandle.h"
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#include "mozilla/dom/quota/ClientDirectoryLock.h"
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#include "mozilla/dom/quota/DirectoryLock.h"
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#include "mozilla/dom/quota/DirectoryLockInlines.h"
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namespace mozilla::dom::quota {
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ClientDirectoryLockHandle::ClientDirectoryLockHandle() {
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MOZ_COUNT_CTOR(mozilla::dom::quota::ClientDirectoryLockHandle);
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}
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ClientDirectoryLockHandle::ClientDirectoryLockHandle(
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RefPtr<ClientDirectoryLock> aClientDirectoryLock) {
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aClientDirectoryLock->AssertIsOnOwningThread();
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mClientDirectoryLock = std::move(aClientDirectoryLock);
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MOZ_COUNT_CTOR(mozilla::dom::quota::ClientDirectoryLockHandle);
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}
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ClientDirectoryLockHandle::ClientDirectoryLockHandle(
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ClientDirectoryLockHandle&& aOther) noexcept {
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aOther.AssertIsOnOwningThread();
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mClientDirectoryLock = std::move(aOther.mClientDirectoryLock);
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// Explicitly null aOther.mClientDirectoryLock so that aOther appears inert
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// immediately after the move. While RefPtr nulls out its mRawPtr internally,
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// the store may be reordered in optimized builds, possibly occurring only
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// just before RefPtr’s own destructor runs. Without this, the moved-from
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// handle’s destructor may observe a stale non-null value.
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aOther.mClientDirectoryLock = nullptr;
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MOZ_COUNT_CTOR(mozilla::dom::quota::ClientDirectoryLockHandle);
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}
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ClientDirectoryLockHandle::~ClientDirectoryLockHandle() {
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// If mClientDirectoryLock is null, this handle is in an inert state — either
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// it was default-constructed or moved.
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//
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// This check is safe here because destruction implies no other thread is
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// using the handle. Any use-after-destroy bugs would indicate a much more
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// serious issue (e.g., a dangling pointer), and should be caught by tools
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// like AddressSanitizer.
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if (mClientDirectoryLock) {
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AssertIsOnOwningThread();
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DropDirectoryLock(mClientDirectoryLock);
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}
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MOZ_COUNT_DTOR(mozilla::dom::quota::ClientDirectoryLockHandle);
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}
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void ClientDirectoryLockHandle::AssertIsOnOwningThread() const {
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NS_ASSERT_OWNINGTHREAD(ClientDirectoryLockHandle);
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}
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ClientDirectoryLockHandle& ClientDirectoryLockHandle::operator=(
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ClientDirectoryLockHandle&& aOther) noexcept {
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AssertIsOnOwningThread();
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aOther.AssertIsOnOwningThread();
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if (this != &aOther) {
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mClientDirectoryLock = std::move(aOther.mClientDirectoryLock);
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// Explicitly null aOther.mClientDirectoryLock so that aOther appears inert
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// immediately after the move. While RefPtr nulls out its mRawPtr
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// internally, the store may be reordered in optimized builds, possibly
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// occurring only just before RefPtr’s own destructor runs. Without this,
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// the moved-from handle’s destructor may observe a stale non-null value.
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aOther.mClientDirectoryLock = nullptr;
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}
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return *this;
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}
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ClientDirectoryLockHandle::operator bool() const {
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AssertIsOnOwningThread();
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return !!mClientDirectoryLock;
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}
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ClientDirectoryLock* ClientDirectoryLockHandle::get() const {
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AssertIsOnOwningThread();
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return mClientDirectoryLock ? mClientDirectoryLock.get() : nullptr;
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}
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ClientDirectoryLock& ClientDirectoryLockHandle::operator*() const {
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AssertIsOnOwningThread();
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return *get();
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}
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ClientDirectoryLock* ClientDirectoryLockHandle::operator->() const {
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AssertIsOnOwningThread();
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return get();
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}
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#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
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bool ClientDirectoryLockHandle::IsInert() const {
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return !mClientDirectoryLock;
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}
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#endif
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} // namespace mozilla::dom::quota
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