/src/mozilla-central/mozglue/misc/TimeStamp.cpp
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1 | | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
2 | | /* vim: set ts=8 sts=2 et sw=2 tw=80: */ |
3 | | /* This Source Code Form is subject to the terms of the Mozilla Public |
4 | | * License, v. 2.0. If a copy of the MPL was not distributed with this |
5 | | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
6 | | |
7 | | /* |
8 | | * Implementation of the OS-independent methods of the TimeStamp class |
9 | | */ |
10 | | |
11 | | #include "mozilla/TimeStamp.h" |
12 | | #include <stdio.h> |
13 | | #include <string.h> |
14 | | #include <stdlib.h> |
15 | | |
16 | | namespace mozilla { |
17 | | |
18 | | /** |
19 | | * Wrapper class used to initialize static data used by the TimeStamp class |
20 | | */ |
21 | | struct TimeStampInitialization |
22 | | { |
23 | | /** |
24 | | * First timestamp taken when the class static initializers are run. This |
25 | | * timestamp is used to sanitize timestamps coming from different sources. |
26 | | */ |
27 | | TimeStamp mFirstTimeStamp; |
28 | | |
29 | | /** |
30 | | * Timestamp representing the time when the process was created. This field |
31 | | * is populated lazily the first time this information is required and is |
32 | | * replaced every time the process is restarted. |
33 | | */ |
34 | | TimeStamp mProcessCreation; |
35 | | |
36 | | TimeStampInitialization() |
37 | 3 | { |
38 | 3 | TimeStamp::Startup(); |
39 | 3 | mFirstTimeStamp = TimeStamp::Now(); |
40 | 3 | }; |
41 | | |
42 | | ~TimeStampInitialization() |
43 | 0 | { |
44 | 0 | TimeStamp::Shutdown(); |
45 | 0 | }; |
46 | | }; |
47 | | |
48 | | static TimeStampInitialization sInitOnce; |
49 | | |
50 | | MFBT_API TimeStamp |
51 | | TimeStamp::ProcessCreation(bool* aIsInconsistent) |
52 | 106 | { |
53 | 106 | if (aIsInconsistent) { |
54 | 0 | *aIsInconsistent = false; |
55 | 0 | } |
56 | 106 | |
57 | 106 | if (sInitOnce.mProcessCreation.IsNull()) { |
58 | 3 | char* mozAppRestart = getenv("MOZ_APP_RESTART"); |
59 | 3 | TimeStamp ts; |
60 | 3 | |
61 | 3 | /* When calling PR_SetEnv() with an empty value the existing variable may |
62 | 3 | * be unset or set to the empty string depending on the underlying platform |
63 | 3 | * thus we have to check if the variable is present and not empty. */ |
64 | 3 | if (mozAppRestart && (strcmp(mozAppRestart, "") != 0)) { |
65 | 0 | /* Firefox was restarted, use the first time-stamp we've taken as the new |
66 | 0 | * process startup time. */ |
67 | 0 | ts = sInitOnce.mFirstTimeStamp; |
68 | 3 | } else { |
69 | 3 | TimeStamp now = Now(); |
70 | 3 | uint64_t uptime = ComputeProcessUptime(); |
71 | 3 | |
72 | 3 | ts = now - TimeDuration::FromMicroseconds(uptime); |
73 | 3 | |
74 | 3 | if ((ts > sInitOnce.mFirstTimeStamp) || (uptime == 0)) { |
75 | 0 | /* If the process creation timestamp was inconsistent replace it with |
76 | 0 | * the first one instead and notify that a telemetry error was |
77 | 0 | * detected. */ |
78 | 0 | if (aIsInconsistent) { |
79 | 0 | *aIsInconsistent = true; |
80 | 0 | } |
81 | 0 | ts = sInitOnce.mFirstTimeStamp; |
82 | 0 | } |
83 | 3 | } |
84 | 3 | |
85 | 3 | sInitOnce.mProcessCreation = ts; |
86 | 3 | } |
87 | 106 | |
88 | 106 | return sInitOnce.mProcessCreation; |
89 | 106 | } |
90 | | |
91 | | void |
92 | | TimeStamp::RecordProcessRestart() |
93 | 0 | { |
94 | 0 | sInitOnce.mProcessCreation = TimeStamp(); |
95 | 0 | } |
96 | | |
97 | | } // namespace mozilla |