1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/**
* @file lltimer.h
* @brief Cross-platform objects for doing timing
*
* $LicenseInfo:firstyear=2000&license=viewergpl$
*
* Copyright (c) 2000-2008, 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://secondlife.com/developers/opensource/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://secondlife.com/developers/opensource/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
#include <sys/time.h>
#endif
// 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() in seconds
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;
private:
//list of active timers
static std::list<LLEventTimer*> sActiveList;
};
#endif
|
