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/**
* @file lltimer.h
* @brief Cross-platform objects for doing timing
*
* Copyright (c) 2000-$CurrentYear$, Linden Research, Inc.
* $License$
*/
#ifndef LL_TIMER_H
#define LL_TIMER_H
#if LL_LINUX || LL_DARWIN
# include <time.h>
# include <sys/time.h>
#endif
#include <list>
// units conversions
#ifndef USEC_PER_SEC
const U32 USEC_PER_SEC = 1000000;
#endif
const U32 SEC_PER_MIN = 60;
const U32 MIN_PER_HOUR = 60;
const U32 USEC_PER_MIN = USEC_PER_SEC * SEC_PER_MIN;
const U32 USEC_PER_HOUR = USEC_PER_MIN * MIN_PER_HOUR;
const U32 SEC_PER_HOUR = SEC_PER_MIN * MIN_PER_HOUR;
const F64 SEC_PER_USEC = 1.0 / (F64) USEC_PER_SEC;
class LLTimer
{
public:
static LLTimer *sTimer; // global timer
protected:
U64 mLastClockCount;
U64 mExpirationTicks;
BOOL mStarted;
public:
LLTimer();
~LLTimer();
static void initClass() { if (!sTimer) sTimer = new LLTimer; }
static void cleanupClass() { delete sTimer; sTimer = NULL; }
// Return a high precision number of seconds since the start of
// this application instance.
static F64 getElapsedSeconds()
{
return sTimer->getElapsedTimeF64();
}
// Return a high precision usec since epoch
static U64 getTotalTime();
// Return a high precision seconds since epoch
static F64 getTotalSeconds();
// MANIPULATORS
void start() { reset(); mStarted = TRUE; }
void stop() { mStarted = FALSE; }
void reset(); // Resets the timer
void setLastClockCount(U64 current_count); // Sets the timer so that the next elapsed call will be relative to this time
void setTimerExpirySec(F32 expiration);
BOOL checkExpirationAndReset(F32 expiration);
BOOL hasExpired();
F32 getElapsedTimeAndResetF32(); // Returns elapsed time in seconds with reset
F64 getElapsedTimeAndResetF64();
F32 getRemainingTimeF32();
static BOOL knownBadTimer();
// ACCESSORS
F32 getElapsedTimeF32() const; // Returns elapsed time in seconds
F64 getElapsedTimeF64() const; // Returns elapsed time in seconds
BOOL getStarted() const { return mStarted; }
static U64 getCurrentClockCount(); // Returns the raw clockticks
};
//
// Various functions for initializing/accessing clock and timing stuff. Don't use these without REALLY knowing how they work.
//
U64 get_clock_count();
F64 calc_clock_frequency(U32 msecs);
void update_clock_frequencies();
// Sleep for milliseconds
void ms_sleep(long ms);
// Yield
//void llyield(); // Yield your timeslice - not implemented yet for Mac, so commented out.
// Returns the correct UTC time in seconds, like time(NULL).
// Useful on the viewer, which may have its local clock set wrong.
U32 time_corrected();
// Correction factor used by time_corrected() above.
extern S32 gUTCOffset;
// Is the current computer (in its current time zone)
// observing daylight savings time?
BOOL is_daylight_savings();
// Converts internal "struct tm" time buffer to Pacific Standard/Daylight Time
// Usage:
// S32 utc_time;
// utc_time = time_corrected();
// struct tm* internal_time = utc_to_pacific_time(utc_time, gDaylight);
struct tm* utc_to_pacific_time(S32 utc_time, BOOL pacific_daylight_time);
void microsecondsToTimecodeString(U64 current_time, char *tcstring);
void secondsToTimecodeString(F32 current_time, char *tcstring);
// class for scheduling a function to be called at a given frequency (approximate, inprecise)
class LLEventTimer
{
public:
LLEventTimer(F32 period); // period is the amount of time between each call to tick()
virtual ~LLEventTimer();
//function to be called at the supplied frequency
virtual void tick() = 0;
static void updateClass();
protected:
LLTimer mEventTimer;
F32 mPeriod;
private:
//list of active timers
static std::list<LLEventTimer*> sActiveList;
};
#endif
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