diff options
Diffstat (limited to 'base/time/time.h')
| -rw-r--r-- | base/time/time.h | 66 |
1 files changed, 7 insertions, 59 deletions
diff --git a/base/time/time.h b/base/time/time.h index 4944085..6c06fbc 100644 --- a/base/time/time.h +++ b/base/time/time.h @@ -13,13 +13,13 @@ // TimeDelta represents a duration of time, internally represented in // microseconds. // -// TimeTicks, ThreadTicks, and TraceTicks represent an abstract time that is -// most of the time incrementing, for use in measuring time durations. -// Internally, they are represented in microseconds. They can not be converted -// to a human-readable time, but are guaranteed not to decrease (unlike the Time -// class). Note that TimeTicks may "stand still" (e.g., if the computer is -// suspended), and ThreadTicks will "stand still" whenever the thread has been -// de-scheduled by the operating system. +// TimeTicks and ThreadTicks represent an abstract time that is most of the time +// incrementing, for use in measuring time durations. Internally, they are +// represented in microseconds. They can not be converted to a human-readable +// time, but are guaranteed not to decrease (unlike the Time class). Note that +// TimeTicks may "stand still" (e.g., if the computer is suspended), and +// ThreadTicks will "stand still" whenever the thread has been de-scheduled by +// the operating system. // // All time classes are copyable, assignable, and occupy 64-bits per // instance. Thus, they can be efficiently passed by-value (as opposed to @@ -45,12 +45,6 @@ // // ThreadTicks: Benchmarking how long the current thread has been doing actual // work. -// -// TraceTicks: This is only meant to be used by the event tracing -// infrastructure, and by outside code modules in special -// circumstances. Please be sure to consult a -// base/trace_event/OWNER before committing any new code that -// uses this. #ifndef BASE_TIME_TIME_H_ #define BASE_TIME_TIME_H_ @@ -784,52 +778,6 @@ class BASE_EXPORT ThreadTicks : public time_internal::TimeBase<ThreadTicks> { // For logging use only. BASE_EXPORT std::ostream& operator<<(std::ostream& os, ThreadTicks time_ticks); -// TraceTicks ---------------------------------------------------------------- - -// Represents high-resolution system trace clock time. -class BASE_EXPORT TraceTicks : public time_internal::TimeBase<TraceTicks> { - public: - // We define this even without OS_CHROMEOS for seccomp sandbox testing. -#if defined(OS_LINUX) - // Force definition of the system trace clock; it is a chromeos-only api - // at the moment and surfacing it in the right place requires mucking - // with glibc et al. - static const clockid_t kClockSystemTrace = 11; -#endif - - TraceTicks() : TimeBase(0) { - } - - // Returns the current system trace time or, if not available on this - // platform, a high-resolution time value; or a low-resolution time value if - // neither are avalable. On systems where a global trace clock is defined, - // timestamping TraceEvents's with this value guarantees synchronization - // between events collected inside chrome and events collected outside - // (e.g. kernel, X server). - // - // On some platforms, the clock source used for tracing can vary depending on - // hardware and/or kernel support. Do not make any assumptions without - // consulting the documentation for this functionality in the time_win.cc, - // time_posix.cc, etc. files. - // - // NOTE: This is only meant to be used by the event tracing infrastructure, - // and by outside code modules in special circumstances. Please be sure to - // consult a base/trace_event/OWNER before committing any new code that uses - // this. - static TraceTicks Now(); - - private: - friend class time_internal::TimeBase<TraceTicks>; - - // Please use Now() to create a new object. This is for internal use - // and testing. - explicit TraceTicks(int64 us) : TimeBase(us) { - } -}; - -// For logging use only. -BASE_EXPORT std::ostream& operator<<(std::ostream& os, TraceTicks time_ticks); - } // namespace base #endif // BASE_TIME_TIME_H_ |