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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 | |
22 | |
23 | typedef struct _LttTime { |
24 | unsigned long tv_sec; |
25 | unsigned long tv_nsec; |
26 | } LttTime; |
27 | |
28 | |
29 | static const unsigned long NANOSECONDS_PER_SECOND = 1000000000; |
30 | |
31 | static const LttTime ltt_time_zero = { 0, 0}; |
32 | |
33 | |
34 | static inline LttTime ltt_time_sub(LttTime t1, LttTime t2) |
35 | { |
36 | LttTime res; |
37 | res.tv_sec = t1.tv_sec - t2.tv_sec; |
38 | if(t1.tv_nsec < t2.tv_nsec) { |
39 | res.tv_sec--; |
40 | res.tv_nsec = NANOSECONDS_PER_SECOND + t1.tv_nsec - t2.tv_nsec; |
41 | } |
42 | else { |
43 | res.tv_nsec = t1.tv_nsec - t2.tv_nsec; |
44 | } |
45 | return res; |
46 | } |
47 | |
48 | |
49 | static inline LttTime ltt_time_add(LttTime t1, LttTime t2) |
50 | { |
51 | LttTime res; |
52 | res.tv_sec = t1.tv_sec + t2.tv_sec; |
53 | res.tv_nsec = t1.tv_nsec + t2.tv_nsec; |
54 | if(res.tv_nsec >= NANOSECONDS_PER_SECOND) { |
55 | res.tv_sec++; |
56 | res.tv_nsec -= NANOSECONDS_PER_SECOND; |
57 | } |
58 | return res; |
59 | } |
60 | |
61 | |
62 | static inline LttTime ltt_time_mul(LttTime t1, float f) |
63 | { |
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64 | LttTime res; |
e17c04d2 |
65 | float d; |
1f1ae829 |
66 | double sec; |
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67 | |
1f1ae829 |
68 | if(f == 0.0){ |
69 | res.tv_sec = 0; |
70 | res.tv_nsec = 0; |
71 | }else{ |
e17c04d2 |
72 | d = 1.0/f; |
1f1ae829 |
73 | sec = t1.tv_sec / (double)d; |
74 | res.tv_sec = sec; |
75 | res.tv_nsec = t1.tv_nsec / (double)d + (sec - res.tv_sec) * |
76 | NANOSECONDS_PER_SECOND; |
77 | res.tv_sec += res.tv_nsec / NANOSECONDS_PER_SECOND; |
78 | res.tv_nsec %= NANOSECONDS_PER_SECOND; |
79 | } |
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80 | return res; |
81 | } |
82 | |
83 | |
84 | static inline LttTime ltt_time_div(LttTime t1, float f) |
85 | { |
86 | double sec; |
87 | LttTime res; |
88 | |
89 | sec = t1.tv_sec / (double)f; |
90 | res.tv_sec = sec; |
91 | res.tv_nsec = t1.tv_nsec / (double)f + (sec - res.tv_sec) * |
92 | NANOSECONDS_PER_SECOND; |
1f1ae829 |
93 | res.tv_sec += res.tv_nsec / NANOSECONDS_PER_SECOND; |
94 | res.tv_nsec %= NANOSECONDS_PER_SECOND; |
308711e5 |
95 | return res; |
96 | } |
97 | |
98 | |
99 | static inline int ltt_time_compare(LttTime t1, LttTime t2) |
100 | { |
101 | if(t1.tv_sec > t2.tv_sec) return 1; |
102 | if(t1.tv_sec < t2.tv_sec) return -1; |
103 | if(t1.tv_nsec > t2.tv_nsec) return 1; |
104 | if(t1.tv_nsec < t2.tv_nsec) return -1; |
105 | return 0; |
106 | } |
107 | |
108 | |
109 | static inline double ltt_time_to_double(LttTime t1) |
110 | { |
111 | return (double)t1.tv_sec + (double)t1.tv_nsec / NANOSECONDS_PER_SECOND; |
112 | } |
113 | |
114 | |
115 | static inline LttTime ltt_time_from_double(double t1) |
116 | { |
117 | LttTime res; |
118 | res.tv_sec = t1; |
119 | res.tv_nsec = (t1 - res.tv_sec) * NANOSECONDS_PER_SECOND; |
120 | return res; |
121 | } |
122 | |
123 | #endif // LTT_TIME_H |