The Tor Browser: ipc/chromium/src/base/time_mac.cc@6474c204b198 (annotated)

ipc/chromium/src/base/time_mac.cc@6474c204b198 (annotated)

ipc/chromium/src/base/time_mac.cc

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 // Copyright (c) 2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 #include "base/time.h"
 #include <CoreFoundation/CFDate.h>
 #include <CoreFoundation/CFTimeZone.h>
 #include <mach/mach_time.h>
 #include <sys/time.h>
 #include <time.h>
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/scoped_cftyperef.h"
 namespace base {
 // The Time routines in this file use Mach and CoreFoundation APIs, since the
 // POSIX definition of time_t in Mac OS X wraps around after 2038--and
 // there are already cookie expiration dates, etc., past that time out in
 // the field.  Using CFDate prevents that problem, and using mach_absolute_time
 // for TimeTicks gives us nice high-resolution interval timing.
 // Time -----------------------------------------------------------------------
 // The internal representation of Time uses a 64-bit microsecond count
 // from 1970-01-01 00:00:00 UTC.  Core Foundation uses a double second count
 // since 2001-01-01 00:00:00 UTC.
 // Some functions in time.cc use time_t directly, so we provide a zero offset
 // for them.  The epoch is 1970-01-01 00:00:00 UTC.
 // static
 const int64_t Time::kTimeTToMicrosecondsOffset = GG_INT64_C(0);
 // static
 Time Time::Now() {
   CFAbsoluteTime now =
       CFAbsoluteTimeGetCurrent() + kCFAbsoluteTimeIntervalSince1970;
   return Time(static_cast<int64_t>(now * kMicrosecondsPerSecond));
 }
 // static
 Time Time::NowFromSystemTime() {
   // Just use Now() because Now() returns the system time.
   return Now();
 }
 // static
 Time Time::FromExploded(bool is_local, const Exploded& exploded) {
   CFGregorianDate date;
   date.second = exploded.second +
       exploded.millisecond / static_cast<double>(kMillisecondsPerSecond);
   date.minute = exploded.minute;
   date.hour = exploded.hour;
   date.day = exploded.day_of_month;
   date.month = exploded.month;
   date.year = exploded.year;
   scoped_cftyperef<CFTimeZoneRef>
       time_zone(is_local ? CFTimeZoneCopySystem() : NULL);
   CFAbsoluteTime seconds = CFGregorianDateGetAbsoluteTime(date, time_zone) +
       kCFAbsoluteTimeIntervalSince1970;
   return Time(static_cast<int64_t>(seconds * kMicrosecondsPerSecond));
 }
 void Time::Explode(bool is_local, Exploded* exploded) const {
   CFAbsoluteTime seconds =
       (static_cast<double>(us_) / kMicrosecondsPerSecond) -
       kCFAbsoluteTimeIntervalSince1970;
   scoped_cftyperef<CFTimeZoneRef>
       time_zone(is_local ? CFTimeZoneCopySystem() : NULL);
   CFGregorianDate date = CFAbsoluteTimeGetGregorianDate(seconds, time_zone);
   exploded->year = date.year;
   exploded->month = date.month;
   exploded->day_of_month = date.day;
   exploded->hour = date.hour;
   exploded->minute = date.minute;
   exploded->second = date.second;
   exploded->millisecond  =
       static_cast<int>(date.second * kMillisecondsPerSecond) %
       kMillisecondsPerSecond;
 }
 // TimeTicks ------------------------------------------------------------------
 // static
 TimeTicks TimeTicks::Now() {
   uint64_t absolute_micro;
   static mach_timebase_info_data_t timebase_info;
   if (timebase_info.denom == 0) {
     // Zero-initialization of statics guarantees that denom will be 0 before
     // calling mach_timebase_info.  mach_timebase_info will never set denom to
     // 0 as that would be invalid, so the zero-check can be used to determine
     // whether mach_timebase_info has already been called.  This is
     // recommended by Apple's QA1398.
     kern_return_t kr = mach_timebase_info(&timebase_info);
     DCHECK(kr == KERN_SUCCESS);
   }
   // mach_absolute_time is it when it comes to ticks on the Mac.  Other calls
   // with less precision (such as TickCount) just call through to
   // mach_absolute_time.
   // timebase_info converts absolute time tick units into nanoseconds.  Convert
   // to microseconds up front to stave off overflows.
   absolute_micro = mach_absolute_time() / Time::kNanosecondsPerMicrosecond *
                    timebase_info.numer / timebase_info.denom;
   // Don't bother with the rollover handling that the Windows version does.
   // With numer and denom = 1 (the expected case), the 64-bit absolute time
   // reported in nanoseconds is enough to last nearly 585 years.
   return TimeTicks(absolute_micro);
 }
 // static
 TimeTicks TimeTicks::HighResNow() {
   return Now();
 }
 }  // namespace base

The Tor Browser / annotate

ipc/chromium/src/base/time_mac.cc@6474c204b198 (annotated)

ipc/chromium/src/base/time_mac.cc