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/**
* @file lltimer.h
* @brief Cross-platform objects for doing timing
*
* $LicenseInfo:firstyear=2000&license=viewergpl$
*
* Copyright (c) 2000-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_TIMER_H
#define LL_TIMER_H
#if LL_LINUX || LL_DARWIN || LL_SOLARIS
#include <sys/time.h>
#endif
#include <limits.h>
#include "stdtypes.h"
#include "lldate.h"
#include "llinstancetracker.h"
#include <string>
#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 LL_COMMON_API 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() const;
F32 getElapsedTimeAndResetF32(); // Returns elapsed time in seconds with reset
F64 getElapsedTimeAndResetF64();
F32 getRemainingTimeF32() const;
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.
//
LL_COMMON_API U64 get_clock_count();
LL_COMMON_API F64 calc_clock_frequency(U32 msecs);
LL_COMMON_API void update_clock_frequencies();
// Sleep for milliseconds
LL_COMMON_API void ms_sleep(U32 ms);
LL_COMMON_API U32 micro_sleep(U64 us, U32 max_yields = 0xFFFFFFFF);
// Returns the correct UTC time in seconds, like time(NULL).
// Useful on the viewer, which may have its local clock set wrong.
LL_COMMON_API time_t time_corrected();
static inline time_t time_min()
{
if (sizeof(time_t) == 4)
{
return (time_t) INT_MIN;
} else {
#ifdef LLONG_MIN
return (time_t) LLONG_MIN;
#else
return (time_t) LONG_MIN;
#endif
}
}
static inline time_t time_max()
{
if (sizeof(time_t) == 4)
{
return (time_t) INT_MAX;
} else {
#ifdef LLONG_MAX
return (time_t) LLONG_MAX;
#else
return (time_t) LONG_MAX;
#endif
}
}
// Correction factor used by time_corrected() above.
extern LL_COMMON_API S32 gUTCOffset;
// Is the current computer (in its current time zone)
// observing daylight savings time?
LL_COMMON_API 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);
LL_COMMON_API struct tm* utc_to_pacific_time(time_t utc_time, BOOL pacific_daylight_time);
LL_COMMON_API void microsecondsToTimecodeString(U64 current_time, std::string& tcstring);
LL_COMMON_API void secondsToTimecodeString(F32 current_time, std::string& tcstring);
// class for scheduling a function to be called at a given frequency (approximate, inprecise)
class LL_COMMON_API LLEventTimer : protected LLInstanceTracker<LLEventTimer>
{
public:
LLEventTimer(F32 period); // period is the amount of time between each call to tick() in seconds
LLEventTimer(const LLDate& time);
virtual ~LLEventTimer();
//function to be called at the supplied frequency
// Normally return FALSE; TRUE will delete the timer after the function returns.
virtual BOOL tick() = 0;
static void updateClass();
protected:
LLTimer mEventTimer;
F32 mPeriod;
};
U64 LL_COMMON_API totalTime(); // Returns current system time in microseconds
#endif
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