tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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ShutdownTracker.cpp (1988B)

      1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* This Source Code Form is subject to the terms of the Mozilla Public
      3 * License, v. 2.0. If a copy of the MPL was not distributed with this
      4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      5 
      6 #include "ShutdownTracker.h"
      7 
      8 #include "mozilla/Services.h"
      9 #include "nsIObserver.h"
     10 #include "nsIObserverService.h"
     11 
     12 namespace mozilla {
     13 namespace image {
     14 
     15 class ShutdownTrackerImpl;
     16 
     17 ///////////////////////////////////////////////////////////////////////////////
     18 // Static Data
     19 ///////////////////////////////////////////////////////////////////////////////
     20 
     21 // Whether we've observed shutdown starting yet.
     22 static bool sShutdownHasStarted = false;
     23 
     24 ///////////////////////////////////////////////////////////////////////////////
     25 // Implementation
     26 ///////////////////////////////////////////////////////////////////////////////
     27 
     28 struct ShutdownObserver : public nsIObserver {
     29  NS_DECL_ISUPPORTS
     30 
     31  NS_IMETHOD Observe(nsISupports*, const char* aTopic,
     32                     const char16_t*) override {
     33    if (strcmp(aTopic, "xpcom-will-shutdown") != 0) {
     34      return NS_OK;
     35    }
     36 
     37    nsCOMPtr<nsIObserverService> os = services::GetObserverService();
     38    if (os) {
     39      os->RemoveObserver(this, "xpcom-will-shutdown");
     40    }
     41 
     42    sShutdownHasStarted = true;
     43    return NS_OK;
     44  }
     45 
     46 private:
     47  virtual ~ShutdownObserver() {}
     48 };
     49 
     50 NS_IMPL_ISUPPORTS(ShutdownObserver, nsIObserver)
     51 
     52 ///////////////////////////////////////////////////////////////////////////////
     53 // Public API
     54 ///////////////////////////////////////////////////////////////////////////////
     55 
     56 /* static */
     57 void ShutdownTracker::Initialize() {
     58  nsCOMPtr<nsIObserverService> os = services::GetObserverService();
     59  if (os) {
     60    os->AddObserver(new ShutdownObserver, "xpcom-will-shutdown", false);
     61  }
     62 }
     63 
     64 /* static */
     65 bool ShutdownTracker::ShutdownHasStarted() { return sShutdownHasStarted; }
     66 
     67 }  // namespace image
     68 }  // namespace mozilla