/src/mozilla-central/image/ShutdownTracker.cpp
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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 | | /////////////////////////////////////////////////////////////////////////////// |
26 | | // Implementation |
27 | | /////////////////////////////////////////////////////////////////////////////// |
28 | | |
29 | | struct ShutdownObserver : public nsIObserver |
30 | | { |
31 | | NS_DECL_ISUPPORTS |
32 | | |
33 | | NS_IMETHOD Observe(nsISupports*, const char* aTopic, const char16_t*) override |
34 | 0 | { |
35 | 0 | if (strcmp(aTopic, "xpcom-will-shutdown") != 0) { |
36 | 0 | return NS_OK; |
37 | 0 | } |
38 | 0 | |
39 | 0 | nsCOMPtr<nsIObserverService> os = services::GetObserverService(); |
40 | 0 | if (os) { |
41 | 0 | os->RemoveObserver(this, "xpcom-will-shutdown"); |
42 | 0 | } |
43 | 0 |
|
44 | 0 | sShutdownHasStarted = true; |
45 | 0 | return NS_OK; |
46 | 0 | } |
47 | | |
48 | | private: |
49 | 0 | virtual ~ShutdownObserver() { } |
50 | | }; |
51 | | |
52 | | NS_IMPL_ISUPPORTS(ShutdownObserver, nsIObserver) |
53 | | |
54 | | |
55 | | /////////////////////////////////////////////////////////////////////////////// |
56 | | // Public API |
57 | | /////////////////////////////////////////////////////////////////////////////// |
58 | | |
59 | | /* static */ void |
60 | | ShutdownTracker::Initialize() |
61 | 0 | { |
62 | 0 | nsCOMPtr<nsIObserverService> os = services::GetObserverService(); |
63 | 0 | if (os) { |
64 | 0 | os->AddObserver(new ShutdownObserver, "xpcom-will-shutdown", false); |
65 | 0 | } |
66 | 0 | } |
67 | | |
68 | | /* static */ bool |
69 | | ShutdownTracker::ShutdownHasStarted() |
70 | 0 | { |
71 | 0 | return sShutdownHasStarted; |
72 | 0 | } |
73 | | |
74 | | } // namespace image |
75 | | } // namespace mozilla |