1 /* This file is part of the Linux Trace Toolkit trace reading library
2 * Copyright (C) 2003-2004 Michel Dagenais
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.
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.
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.
25 typedef struct _LttTime
{
27 unsigned long tv_nsec
;
31 #define NANOSECONDS_PER_SECOND 1000000000
32 #define SHIFT_CONST 1.07374182400631629848
34 static const LttTime ltt_time_zero
= { 0, 0 };
36 static const LttTime ltt_time_one
= { 0, 1 };
38 static const LttTime ltt_time_infinite
= { G_MAXUINT
, NANOSECONDS_PER_SECOND
};
40 static inline LttTime
ltt_time_sub(LttTime t1
, LttTime t2
)
43 res
.tv_sec
= t1
.tv_sec
- t2
.tv_sec
;
44 res
.tv_nsec
= t1
.tv_nsec
- t2
.tv_nsec
;
45 if(t1
.tv_nsec
< t2
.tv_nsec
) {
47 res
.tv_nsec
+= NANOSECONDS_PER_SECOND
;
53 static inline LttTime
ltt_time_add(LttTime t1
, LttTime t2
)
56 res
.tv_nsec
= t1
.tv_nsec
+ t2
.tv_nsec
;
57 res
.tv_sec
= t1
.tv_sec
+ t2
.tv_sec
;
58 if(res
.tv_nsec
>= NANOSECONDS_PER_SECOND
) {
60 res
.tv_nsec
-= NANOSECONDS_PER_SECOND
;
66 /* Fastest comparison : t1 > t2 */
67 static inline int ltt_time_compare(LttTime t1
, LttTime t2
)
70 if(t1
.tv_sec
> t2
.tv_sec
) ret
= 1;
71 else if(t1
.tv_sec
< t2
.tv_sec
) ret
= -1;
72 else if(t1
.tv_nsec
> t2
.tv_nsec
) ret
= 1;
73 else if(t1
.tv_nsec
< t2
.tv_nsec
) ret
= -1;
78 #define LTT_TIME_MIN(a,b) ((ltt_time_compare((a),(b)) < 0) ? (a) : (b))
79 #define LTT_TIME_MAX(a,b) ((ltt_time_compare((a),(b)) > 0) ? (a) : (b))
81 #define MAX_TV_SEC_TO_DOUBLE 0x7FFFFF
82 static inline double ltt_time_to_double(LttTime t1
)
84 /* We lose precision if tv_sec is > than (2^23)-1
86 * Max values that fits in a double (53 bits precision on normalised
88 * tv_nsec : NANOSECONDS_PER_SECONDS : 2^30
90 * So we have 53-30 = 23 bits left for tv_sec.
93 g_assert(t1
.tv_sec
<= MAX_TV_SEC_TO_DOUBLE
);
94 if(t1
.tv_sec
> MAX_TV_SEC_TO_DOUBLE
)
95 g_warning("Precision loss in conversion LttTime to double");
97 return ((double)t1
.tv_sec
* (double)NANOSECONDS_PER_SECOND
) + (double)t1
.tv_nsec
;
101 static inline LttTime
ltt_time_from_double(double t1
)
103 /* We lose precision if tv_sec is > than (2^23)-1
105 * Max values that fits in a double (53 bits precision on normalised
107 * tv_nsec : NANOSECONDS_PER_SECONDS : 2^30
109 * So we have 53-30 = 23 bits left for tv_sec.
112 g_assert(t1
<= MAX_TV_SEC_TO_DOUBLE
);
113 if(t1
> MAX_TV_SEC_TO_DOUBLE
)
114 g_warning("Conversion from non precise double to LttTime");
117 //res.tv_sec = t1/(double)NANOSECONDS_PER_SECOND;
118 res
.tv_sec
= (guint64
)(t1
* SHIFT_CONST
) >> 30;
119 res
.tv_nsec
= (t1
- (res
.tv_sec
*NANOSECONDS_PER_SECOND
));
123 /* Use ltt_time_to_double and ltt_time_from_double to check for lack
126 static inline LttTime
ltt_time_mul(LttTime t1
, double d
)
130 double time_double
= ltt_time_to_double(t1
);
132 time_double
= time_double
* d
;
134 res
= ltt_time_from_double(time_double
);
139 /* What is that ? (Mathieu) */
146 sec
= t1
.tv_sec
/ (double)d
;
148 res
.tv_nsec
= t1
.tv_nsec
/ (double)d
+ (sec
- res
.tv_sec
) *
149 NANOSECONDS_PER_SECOND
;
150 res
.tv_sec
+= res
.tv_nsec
/ NANOSECONDS_PER_SECOND
;
151 res
.tv_nsec
%= NANOSECONDS_PER_SECOND
;
158 /* Use ltt_time_to_double and ltt_time_from_double to check for lack
161 static inline LttTime
ltt_time_div(LttTime t1
, double d
)
165 double time_double
= ltt_time_to_double(t1
);
167 time_double
= time_double
/ d
;
169 res
= ltt_time_from_double(time_double
);
178 sec
= t1
.tv_sec
/ (double)f
;
180 res
.tv_nsec
= t1
.tv_nsec
/ (double)f
+ (sec
- res
.tv_sec
) *
181 NANOSECONDS_PER_SECOND
;
182 res
.tv_sec
+= res
.tv_nsec
/ NANOSECONDS_PER_SECOND
;
183 res
.tv_nsec
%= NANOSECONDS_PER_SECOND
;
188 static inline guint64
ltt_time_to_uint64(LttTime t1
)
190 return (guint64
)t1
.tv_sec
*NANOSECONDS_PER_SECOND
191 + (guint64
)t1
.tv_nsec
;
195 #define MAX_TV_SEC_TO_UINT64 0x3FFFFFFFFFFFFFFFULL
196 static inline LttTime
ltt_time_from_uint64(guint64 t1
)
198 /* We lose precision if tv_sec is > than (2^62)-1
201 g_assert(t1
<= MAX_TV_SEC_TO_UINT64
);
202 if(t1
> MAX_TV_SEC_TO_UINT64
)
203 g_warning("Conversion from non precise uint64 to LttTime");
206 res
.tv_sec
= t1
/NANOSECONDS_PER_SECOND
;
207 res
.tv_nsec
= (t1
- res
.tv_sec
*NANOSECONDS_PER_SECOND
);