1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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15 : * The Original Code is the Netscape Portable Runtime (NSPR).
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37 :
38 : /*
39 : * file: prinrval.c
40 : * description: implementation for the kernel interval timing functions
41 : */
42 :
43 : #include "primpl.h"
44 :
45 : /*
46 : *-----------------------------------------------------------------------
47 : *
48 : * _PR_InitClock --
49 : *
50 : *
51 : *-----------------------------------------------------------------------
52 : */
53 :
54 20034 : void _PR_InitClock(void)
55 : {
56 : _PR_MD_INTERVAL_INIT();
57 : #ifdef DEBUG
58 : {
59 20034 : PRIntervalTime ticksPerSec = PR_TicksPerSecond();
60 :
61 20034 : PR_ASSERT(ticksPerSec >= PR_INTERVAL_MIN);
62 20034 : PR_ASSERT(ticksPerSec <= PR_INTERVAL_MAX);
63 : }
64 : #endif /* DEBUG */
65 20034 : }
66 :
67 : /*
68 : * This version of interval times is based on the time of day
69 : * capability offered by system. This isn't valid for two reasons:
70 : * 1) The time of day is neither linear nor montonically increasing
71 : * 2) The units here are milliseconds. That's not appropriate for our use.
72 : */
73 :
74 930201 : PR_IMPLEMENT(PRIntervalTime) PR_IntervalNow(void)
75 : {
76 930201 : if (!_pr_initialized) _PR_ImplicitInitialization();
77 930201 : return _PR_MD_GET_INTERVAL();
78 : } /* PR_IntervalNow */
79 :
80 541774 : PR_EXTERN(PRUint32) PR_TicksPerSecond(void)
81 : {
82 541774 : if (!_pr_initialized) _PR_ImplicitInitialization();
83 541774 : return _PR_MD_INTERVAL_PER_SEC();
84 : } /* PR_TicksPerSecond */
85 :
86 72129 : PR_IMPLEMENT(PRIntervalTime) PR_SecondsToInterval(PRUint32 seconds)
87 : {
88 72129 : return seconds * PR_TicksPerSecond();
89 : } /* PR_SecondsToInterval */
90 :
91 203413 : PR_IMPLEMENT(PRIntervalTime) PR_MillisecondsToInterval(PRUint32 milli)
92 : {
93 : PRIntervalTime ticks;
94 : PRUint64 tock, tps, msecPerSec, rounding;
95 203413 : LL_UI2L(tock, milli);
96 203413 : LL_I2L(msecPerSec, PR_MSEC_PER_SEC);
97 203413 : LL_I2L(rounding, (PR_MSEC_PER_SEC >> 1));
98 203413 : LL_I2L(tps, PR_TicksPerSecond());
99 203413 : LL_MUL(tock, tock, tps);
100 203413 : LL_ADD(tock, tock, rounding);
101 203413 : LL_DIV(tock, tock, msecPerSec);
102 203413 : LL_L2UI(ticks, tock);
103 203413 : return ticks;
104 : } /* PR_MillisecondsToInterval */
105 :
106 47469 : PR_IMPLEMENT(PRIntervalTime) PR_MicrosecondsToInterval(PRUint32 micro)
107 : {
108 : PRIntervalTime ticks;
109 : PRUint64 tock, tps, usecPerSec, rounding;
110 47469 : LL_UI2L(tock, micro);
111 47469 : LL_I2L(usecPerSec, PR_USEC_PER_SEC);
112 47469 : LL_I2L(rounding, (PR_USEC_PER_SEC >> 1));
113 47469 : LL_I2L(tps, PR_TicksPerSecond());
114 47469 : LL_MUL(tock, tock, tps);
115 47469 : LL_ADD(tock, tock, rounding);
116 47469 : LL_DIV(tock, tock, usecPerSec);
117 47469 : LL_L2UI(ticks, tock);
118 47469 : return ticks;
119 : } /* PR_MicrosecondsToInterval */
120 :
121 61511 : PR_IMPLEMENT(PRUint32) PR_IntervalToSeconds(PRIntervalTime ticks)
122 : {
123 61511 : return ticks / PR_TicksPerSecond();
124 : } /* PR_IntervalToSeconds */
125 :
126 61536 : PR_IMPLEMENT(PRUint32) PR_IntervalToMilliseconds(PRIntervalTime ticks)
127 : {
128 : PRUint32 milli;
129 : PRUint64 tock, tps, msecPerSec, rounding;
130 61536 : LL_UI2L(tock, ticks);
131 61536 : LL_I2L(msecPerSec, PR_MSEC_PER_SEC);
132 61536 : LL_I2L(tps, PR_TicksPerSecond());
133 61536 : LL_USHR(rounding, tps, 1);
134 61536 : LL_MUL(tock, tock, msecPerSec);
135 61536 : LL_ADD(tock, tock, rounding);
136 61536 : LL_DIV(tock, tock, tps);
137 61536 : LL_L2UI(milli, tock);
138 61536 : return milli;
139 : } /* PR_IntervalToMilliseconds */
140 :
141 36642 : PR_IMPLEMENT(PRUint32) PR_IntervalToMicroseconds(PRIntervalTime ticks)
142 : {
143 : PRUint32 micro;
144 : PRUint64 tock, tps, usecPerSec, rounding;
145 36642 : LL_UI2L(tock, ticks);
146 36642 : LL_I2L(usecPerSec, PR_USEC_PER_SEC);
147 36642 : LL_I2L(tps, PR_TicksPerSecond());
148 36642 : LL_USHR(rounding, tps, 1);
149 36642 : LL_MUL(tock, tock, usecPerSec);
150 36642 : LL_ADD(tock, tock, rounding);
151 36642 : LL_DIV(tock, tock, tps);
152 36642 : LL_L2UI(micro, tock);
153 36642 : return micro;
154 : } /* PR_IntervalToMicroseconds */
155 :
156 : /* prinrval.c */
157 :
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