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
|
/**
* @file lldeadmantimer.cpp
* @brief Simple deadman-switch timer.
* @author monty@lindenlab.com
*
* $LicenseInfo:firstyear=2013&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2013, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "lldeadmantimer.h"
LLDeadmanTimer::LLDeadmanTimer(F64 horizon)
: mHorizon(U64(horizon * gClockFrequency)),
mActive(false), // If true, a timer is running.
mDone(false), // If true, timer has completed and can be read (once)
mStarted(U64L(0)),
mExpires(U64L(0)),
mStopped(U64L(0)),
mCount(U64L(0))
{}
void LLDeadmanTimer::start(U64 now)
{
// *TODO: If active, let's complete an existing timer and save
// the result to the side. I think this will be useful later.
// For now, wipe out anything in progress, start fresh.
if (! now)
{
now = LLTimer::getCurrentClockCount();
}
mActive = true;
mDone = false;
mStarted = now;
mExpires = now + mHorizon;
mStopped = now;
mCount = U64L(0);
}
void LLDeadmanTimer::stop(U64 now)
{
if (! mActive)
{
return;
}
if (! now)
{
now = LLTimer::getCurrentClockCount();
}
mStopped = now;
mActive = false;
mDone = true;
}
bool LLDeadmanTimer::isExpired(F64 & started, F64 & stopped, U64 & count, U64 now)
{
if (! mActive)
{
return false;
}
if (! mDone)
{
if (! now)
{
now = LLTimer::getCurrentClockCount();
}
if (now > mExpires)
{
// mStopped from ringBell() is the value we want
mActive = false;
mDone = true;
}
}
if (! mDone)
{
return false;
}
started = mStarted * gClockFrequencyInv;
stopped = mStopped * gClockFrequencyInv;
count = mCount;
mDone = false;
return true;
}
void LLDeadmanTimer::ringBell(U64 now)
{
if (! mActive)
{
return;
}
if (! now)
{
now = LLTimer::getCurrentClockCount();
}
if (now > mExpires)
{
mActive = false;
mDone = true;
}
else
{
mStopped = now;
mExpires = now + mHorizon;
++mCount;
}
return;
}
|
