зеркало из https://github.com/mozilla/gecko-dev.git
50 строки
1.9 KiB
C
50 строки
1.9 KiB
C
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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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 nsUpdateSyncManager_h__
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#define nsUpdateSyncManager_h__
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#include "mozilla/AlreadyAddRefed.h"
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#include "nsIObserver.h"
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#include "nsIUpdateService.h"
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#include "MultiInstanceLock.h"
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// The update sync manager is responsible for making sure that only one
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// instance of the application is running at the time we want to start updating
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// it. It does this by taking a multi-instance lock very early during the
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// application's startup process. Then, when app update tasks are ready to run,
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// the update service asks us whether anything else has also taken that lock,
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// which, if true, would mean another instance of the application is currently
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// running and performing update tasks should be avoided (the update service
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// also runs a timeout and eventually goes ahead with the update in order to
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// prevent an external program from effectively disabling updates).
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class nsUpdateSyncManager final : public nsIUpdateSyncManager,
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public nsIObserver {
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public:
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nsUpdateSyncManager();
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIUPDATESYNCMANAGER
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NS_DECL_NSIOBSERVER
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static already_AddRefed<nsUpdateSyncManager> GetSingleton();
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private:
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~nsUpdateSyncManager();
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nsUpdateSyncManager(nsUpdateSyncManager&) = delete;
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nsUpdateSyncManager(nsUpdateSyncManager&&) = delete;
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nsUpdateSyncManager& operator=(nsUpdateSyncManager&) = delete;
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nsUpdateSyncManager& operator=(nsUpdateSyncManager&&) = delete;
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nsresult OpenLock();
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void ReleaseLock();
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mozilla::MultiInstLockHandle mLock = MULTI_INSTANCE_LOCK_HANDLE_ERROR;
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};
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#endif // nsUpdateSyncManager_h__
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