The Tor Browser / file comparison
comparison: xpcom/ds/TimeStamp.cpp
xpcom/ds/TimeStamp.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:dc2ac046db48 |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim:set ts=2 sw=2 sts=2 et cindent: */ | |
| 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 "prenv.h" | |
| 13 | |
| 14 namespace mozilla { | |
| 15 | |
| 16 /** | |
| 17 * Wrapper class used to initialize static data used by the TimeStamp class | |
| 18 */ | |
| 19 struct TimeStampInitialization { | |
| 20 /** | |
| 21 * First timestamp taken when the class static initializers are run. This | |
| 22 * timestamp is used to sanitize timestamps coming from different sources. | |
| 23 */ | |
| 24 TimeStamp mFirstTimeStamp; | |
| 25 | |
| 26 /** | |
| 27 * Timestamp representing the time when the process was created. This field | |
| 28 * is populated lazily the first time this information is required and is | |
| 29 * replaced every time the process is restarted. | |
| 30 */ | |
| 31 TimeStamp mProcessCreation; | |
| 32 | |
| 33 TimeStampInitialization() { | |
| 34 TimeStamp::Startup(); | |
| 35 mFirstTimeStamp = TimeStamp::Now(); | |
| 36 }; | |
| 37 | |
| 38 ~TimeStampInitialization() { | |
| 39 TimeStamp::Shutdown(); | |
| 40 }; | |
| 41 }; | |
| 42 | |
| 43 static TimeStampInitialization sInitOnce; | |
| 44 | |
| 45 TimeStamp | |
| 46 TimeStamp::ProcessCreation(bool& aIsInconsistent) | |
| 47 { | |
| 48 aIsInconsistent = false; | |
| 49 | |
| 50 if (sInitOnce.mProcessCreation.IsNull()) { | |
| 51 char *mozAppRestart = PR_GetEnv("MOZ_APP_RESTART"); | |
| 52 TimeStamp ts; | |
| 53 | |
| 54 /* When calling PR_SetEnv() with an empty value the existing variable may | |
| 55 * be unset or set to the empty string depending on the underlying platform | |
| 56 * thus we have to check if the variable is present and not empty. */ | |
| 57 if (mozAppRestart && (strcmp(mozAppRestart, "") != 0)) { | |
| 58 /* Firefox was restarted, use the first time-stamp we've taken as the new | |
| 59 * process startup time. */ | |
| 60 ts = sInitOnce.mFirstTimeStamp; | |
| 61 } else { | |
| 62 TimeStamp now = Now(); | |
| 63 uint64_t uptime = ComputeProcessUptime(); | |
| 64 | |
| 65 ts = now - TimeDuration::FromMicroseconds(uptime); | |
| 66 | |
| 67 if ((ts > sInitOnce.mFirstTimeStamp) || (uptime == 0)) { | |
| 68 /* If the process creation timestamp was inconsistent replace it with | |
| 69 * the first one instead and notify that a telemetry error was | |
| 70 * detected. */ | |
| 71 aIsInconsistent = true; | |
| 72 ts = sInitOnce.mFirstTimeStamp; | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 sInitOnce.mProcessCreation = ts; | |
| 77 } | |
| 78 | |
| 79 return sInitOnce.mProcessCreation; | |
| 80 } | |
| 81 | |
| 82 void | |
| 83 TimeStamp::RecordProcessRestart() | |
| 84 { | |
| 85 sInitOnce.mProcessCreation = TimeStamp(); | |
| 86 } | |
| 87 | |
| 88 } // namespace mozilla |
