109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
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/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file trueClock.h
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* @author drose
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* @date 2000-07-04
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*/
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#ifndef TRUECLOCK_H
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#define TRUECLOCK_H
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#include "pandabase.h"
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#include "typedef.h"
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#include "pdeque.h"
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#include "mutexImpl.h"
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#include "config_express.h"
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/**
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* An interface to whatever real-time clock we might have available in the
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* current environment. There is only one TrueClock in existence, and it
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* constructs itself.
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*
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* The TrueClock returns elapsed real time in seconds since some undefined
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* epoch. Since it is not defined at what time precisely the clock indicates
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* zero, this value can only be meaningfully used to measure elapsed time, by
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* sampling it at two different times and subtracting.
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*/
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class EXPCL_PANDA_EXPRESS TrueClock {
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PUBLISHED:
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// get_long_time() returns the most accurate timer we have over a long
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// interval. It may not be very precise for measuring short intervals, but
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// it should not drift substantially over the long haul.
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double get_long_time();
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MAKE_PROPERTY(long_time, get_long_time);
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// get_short_time() returns the most precise timer we have over a short
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// interval. It may tend to drift over the long haul, but it should have
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// lots of digits to measure short intervals very precisely.
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INLINE double get_short_time();
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MAKE_PROPERTY(short_time, get_short_time);
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// get_short_raw_time() is like get_short_time(), but does not apply any
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// corrections (e.g. paranoid-clock) to the result returned by the OS.
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double get_short_raw_time();
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MAKE_PROPERTY(short_raw_time, get_short_raw_time);
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INLINE int get_error_count() const;
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MAKE_PROPERTY(error_count, get_error_count);
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INLINE static TrueClock *get_global_ptr();
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bool set_cpu_affinity(uint32_t mask) const;
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protected:
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TrueClock();
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INLINE ~TrueClock();
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int _error_count;
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static TrueClock *_global_ptr;
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#ifdef WIN32
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double correct_time(double time);
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void set_time_scale(double time, double new_time_scale);
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bool _has_high_res;
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int64_t _init_count;
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double _frequency, _recip_frequency;
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int _init_tc;
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uint64_t _init_tod;
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// The rest of the data structures in this block are strictly for
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// implementing paranoid_clock: they are designed to allow us to cross-check
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// the high-resolution clock against the time-of-day clock, and smoothly
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// correct for deviations.
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class Timestamp {
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public:
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Timestamp(double time, double tod) : _time(time), _tod(tod) { }
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double _time;
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double _tod;
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};
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typedef pdeque<Timestamp> Timestamps;
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Timestamps _timestamps;
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double _time_scale;
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double _time_offset;
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double _tod_offset;
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int _num_jump_errors;
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bool _time_scale_changed;
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double _last_reported_time_scale;
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double _report_time_scale_time;
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enum ChaseClock {
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CC_slow_down,
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CC_keep_even,
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CC_speed_up,
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};
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ChaseClock _chase_clock;
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MutexImpl _lock;
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#endif // WIN32
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};
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#include "trueClock.I"
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#endif
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