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257d9118dc
Right now, NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR expects singleton constructors to return already-addrefed raw pointers, and while it accepts constructors that return already_AddRefed, most existing don't do so. Meanwhile, the convention elsewhere is that a raw pointer return value is owned by the callee, and that the caller needs to addref it if it wants to keep its own reference to it. The difference in convention makes it easy to leak (I've definitely caused more than one shutdown leak this way), so it would be better if we required the singleton getters to return an explicit already_AddRefed, which would behave the same for all callers. This also cleans up several singleton constructors that left a dangling pointer to their singletons when their initialization methods failed, when they released their references without clearing their global raw pointers. MozReview-Commit-ID: 9peyG4pRYcr --HG-- extra : rebase_source : 2f5bd89c17cb554541be38444672a827c1392f3f
62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set sw=2 ts=8 et 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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#ifndef mozilla_net_ChildDNSService_h
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#define mozilla_net_ChildDNSService_h
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#include "nsPIDNSService.h"
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#include "nsIObserver.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/Mutex.h"
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#include "DNSRequestChild.h"
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#include "nsHashKeys.h"
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#include "nsClassHashtable.h"
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namespace mozilla {
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namespace net {
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class ChildDNSService final
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: public nsPIDNSService
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, public nsIObserver
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{
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public:
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// AsyncResolve (and CancelAsyncResolve) can be called off-main
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSPIDNSSERVICE
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NS_DECL_NSIDNSSERVICE
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NS_DECL_NSIOBSERVER
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ChildDNSService();
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static already_AddRefed<ChildDNSService> GetSingleton();
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void NotifyRequestDone(DNSRequestChild *aDnsRequest);
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bool GetOffline() const;
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private:
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virtual ~ChildDNSService();
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void MOZ_ALWAYS_INLINE GetDNSRecordHashKey(const nsACString &aHost,
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const OriginAttributes &aOriginAttributes,
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uint32_t aFlags,
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const nsACString &aNetworkInterface,
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nsIDNSListener* aListener,
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nsACString &aHashKey);
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bool mFirstTime;
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bool mDisablePrefetch;
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// We need to remember pending dns requests to be able to cancel them.
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nsClassHashtable<nsCStringHashKey, nsTArray<RefPtr<DNSRequestChild>>> mPendingRequests;
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Mutex mPendingRequestsLock;
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};
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} // namespace net
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} // namespace mozilla
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#endif // mozilla_net_ChildDNSService_h
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