9c312311 |
1 | /* This file is part of the Linux Trace Toolkit trace reading library |
2 | * Copyright (C) 2003-2004 Michel Dagenais |
3 | * |
4 | * This library is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU Lesser General Public |
6 | * License Version 2.1 as published by the Free Software Foundation. |
7 | * |
8 | * This library is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. |
12 | * |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
16 | * Boston, MA 02111-1307, USA. |
17 | */ |
18 | |
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19 | #ifndef LTT_TIME_H |
20 | #define LTT_TIME_H |
21 | |
a00149f6 |
22 | #include <glib.h> |
23 | |
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24 | |
25 | typedef struct _LttTime { |
26 | unsigned long tv_sec; |
27 | unsigned long tv_nsec; |
28 | } LttTime; |
29 | |
30 | |
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31 | #define NANOSECONDS_PER_SECOND 1000000000 |
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32 | |
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33 | static const LttTime ltt_time_zero = { 0, 0 }; |
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34 | |
18206708 |
35 | static const LttTime ltt_time_one = { 0, 1 }; |
36 | |
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37 | static const LttTime ltt_time_infinite = { G_MAXUINT, NANOSECONDS_PER_SECOND }; |
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38 | |
39 | static inline LttTime ltt_time_sub(LttTime t1, LttTime t2) |
40 | { |
41 | LttTime res; |
42 | res.tv_sec = t1.tv_sec - t2.tv_sec; |
43 | if(t1.tv_nsec < t2.tv_nsec) { |
44 | res.tv_sec--; |
45 | res.tv_nsec = NANOSECONDS_PER_SECOND + t1.tv_nsec - t2.tv_nsec; |
46 | } |
47 | else { |
48 | res.tv_nsec = t1.tv_nsec - t2.tv_nsec; |
49 | } |
50 | return res; |
51 | } |
52 | |
53 | |
54 | static inline LttTime ltt_time_add(LttTime t1, LttTime t2) |
55 | { |
56 | LttTime res; |
57 | res.tv_sec = t1.tv_sec + t2.tv_sec; |
58 | res.tv_nsec = t1.tv_nsec + t2.tv_nsec; |
59 | if(res.tv_nsec >= NANOSECONDS_PER_SECOND) { |
60 | res.tv_sec++; |
61 | res.tv_nsec -= NANOSECONDS_PER_SECOND; |
62 | } |
63 | return res; |
64 | } |
65 | |
66 | |
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67 | static inline int ltt_time_compare(LttTime t1, LttTime t2) |
68 | { |
69 | if(t1.tv_sec > t2.tv_sec) return 1; |
70 | if(t1.tv_sec < t2.tv_sec) return -1; |
71 | if(t1.tv_nsec > t2.tv_nsec) return 1; |
72 | if(t1.tv_nsec < t2.tv_nsec) return -1; |
73 | return 0; |
74 | } |
75 | |
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76 | #define LTT_TIME_MIN(a,b) ((ltt_time_compare((a),(b)) < 0) ? (a) : (b)) |
77 | #define LTT_TIME_MAX(a,b) ((ltt_time_compare((a),(b)) > 0) ? (a) : (b)) |
78 | |
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79 | #define MAX_TV_SEC_TO_DOUBLE 0x7FFFFF |
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80 | static inline double ltt_time_to_double(LttTime t1) |
81 | { |
8aee234c |
82 | /* We lose precision if tv_sec is > than (2^23)-1 |
83 | * |
84 | * Max values that fits in a double (53 bits precision on normalised |
85 | * mantissa): |
86 | * tv_nsec : NANOSECONDS_PER_SECONDS : 2^30 |
87 | * |
88 | * So we have 53-30 = 23 bits left for tv_sec. |
89 | * */ |
0c5dbe3b |
90 | g_assert(t1.tv_sec <= MAX_TV_SEC_TO_DOUBLE); |
8aee234c |
91 | if(t1.tv_sec > MAX_TV_SEC_TO_DOUBLE) |
92 | g_warning("Precision loss in conversion LttTime to double"); |
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93 | return (double)t1.tv_sec + (double)t1.tv_nsec / NANOSECONDS_PER_SECOND; |
94 | } |
95 | |
96 | |
97 | static inline LttTime ltt_time_from_double(double t1) |
98 | { |
8aee234c |
99 | /* We lose precision if tv_sec is > than (2^23)-1 |
100 | * |
101 | * Max values that fits in a double (53 bits precision on normalised |
102 | * mantissa): |
103 | * tv_nsec : NANOSECONDS_PER_SECONDS : 2^30 |
104 | * |
105 | * So we have 53-30 = 23 bits left for tv_sec. |
106 | * */ |
0c5dbe3b |
107 | g_assert(t1 <= MAX_TV_SEC_TO_DOUBLE); |
8aee234c |
108 | if(t1 > MAX_TV_SEC_TO_DOUBLE) |
109 | g_warning("Conversion from non precise double to LttTime"); |
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110 | LttTime res; |
111 | res.tv_sec = t1; |
112 | res.tv_nsec = (t1 - res.tv_sec) * NANOSECONDS_PER_SECOND; |
113 | return res; |
114 | } |
115 | |
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116 | /* Use ltt_time_to_double and ltt_time_from_double to check for lack |
117 | * of precision. |
118 | */ |
119 | static inline LttTime ltt_time_mul(LttTime t1, double d) |
120 | { |
121 | LttTime res; |
122 | |
123 | double time_double = ltt_time_to_double(t1); |
124 | |
125 | time_double = time_double * d; |
126 | |
127 | res = ltt_time_from_double(time_double); |
128 | |
129 | return res; |
130 | |
131 | #if 0 |
132 | /* What is that ? (Mathieu) */ |
133 | if(f == 0.0){ |
134 | res.tv_sec = 0; |
135 | res.tv_nsec = 0; |
136 | }else{ |
137 | double d; |
138 | d = 1.0/f; |
139 | sec = t1.tv_sec / (double)d; |
140 | res.tv_sec = sec; |
141 | res.tv_nsec = t1.tv_nsec / (double)d + (sec - res.tv_sec) * |
142 | NANOSECONDS_PER_SECOND; |
143 | res.tv_sec += res.tv_nsec / NANOSECONDS_PER_SECOND; |
144 | res.tv_nsec %= NANOSECONDS_PER_SECOND; |
145 | } |
146 | return res; |
147 | #endif //0 |
148 | } |
149 | |
150 | |
151 | /* Use ltt_time_to_double and ltt_time_from_double to check for lack |
152 | * of precision. |
153 | */ |
154 | static inline LttTime ltt_time_div(LttTime t1, double d) |
155 | { |
156 | LttTime res; |
157 | |
158 | double time_double = ltt_time_to_double(t1); |
159 | |
160 | time_double = time_double / d; |
161 | |
162 | res = ltt_time_from_double(time_double); |
163 | |
164 | return res; |
165 | |
166 | |
167 | #if 0 |
168 | double sec; |
169 | LttTime res; |
170 | |
171 | sec = t1.tv_sec / (double)f; |
172 | res.tv_sec = sec; |
173 | res.tv_nsec = t1.tv_nsec / (double)f + (sec - res.tv_sec) * |
174 | NANOSECONDS_PER_SECOND; |
175 | res.tv_sec += res.tv_nsec / NANOSECONDS_PER_SECOND; |
176 | res.tv_nsec %= NANOSECONDS_PER_SECOND; |
177 | return res; |
178 | #endif //0 |
179 | } |
180 | |
90ef7e4a |
181 | static inline guint64 ltt_time_to_uint64(LttTime t1) |
182 | { |
183 | return (guint64)t1.tv_sec*NANOSECONDS_PER_SECOND |
184 | + (guint64)t1.tv_nsec; |
185 | } |
186 | |
187 | |
188 | #define MAX_TV_SEC_TO_UINT64 0x3FFFFFFFFFFFFFFFULL |
189 | static inline LttTime ltt_time_from_uint64(guint64 t1) |
190 | { |
191 | /* We lose precision if tv_sec is > than (2^62)-1 |
192 | * */ |
193 | g_assert(t1 <= MAX_TV_SEC_TO_UINT64); |
194 | if(t1 > MAX_TV_SEC_TO_UINT64) |
195 | g_warning("Conversion from non precise uint64 to LttTime"); |
196 | LttTime res; |
197 | res.tv_sec = t1/NANOSECONDS_PER_SECOND; |
198 | res.tv_nsec = (t1 - res.tv_sec*NANOSECONDS_PER_SECOND); |
199 | return res; |
200 | } |
8d1e6362 |
201 | |
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202 | #endif // LTT_TIME_H |