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
33 static const LttTime ltt_time_zero
= { 0, 0 };
35 static const LttTime ltt_time_one
= { 0, 1 };
37 static const LttTime ltt_time_infinite
= { G_MAXUINT
, NANOSECONDS_PER_SECOND
};
39 static inline LttTime
ltt_time_sub(LttTime t1
, LttTime t2
)
42 res
.tv_sec
= t1
.tv_sec
- t2
.tv_sec
;
43 res
.tv_nsec
= t1
.tv_nsec
- t2
.tv_nsec
;
44 if(t1
.tv_nsec
< t2
.tv_nsec
) {
46 res
.tv_nsec
+= NANOSECONDS_PER_SECOND
;
52 static inline LttTime
ltt_time_add(LttTime t1
, LttTime t2
)
55 res
.tv_nsec
= t1
.tv_nsec
+ t2
.tv_nsec
;
56 res
.tv_sec
= t1
.tv_sec
+ t2
.tv_sec
;
57 if(res
.tv_nsec
>= NANOSECONDS_PER_SECOND
) {
59 res
.tv_nsec
-= NANOSECONDS_PER_SECOND
;
65 static inline int ltt_time_compare(LttTime t1
, LttTime t2
)
67 if(t1
.tv_sec
> t2
.tv_sec
) return 1;
68 if(t1
.tv_sec
< t2
.tv_sec
) return -1;
69 if(t1
.tv_nsec
> t2
.tv_nsec
) return 1;
70 if(t1
.tv_nsec
< t2
.tv_nsec
) return -1;
74 #define LTT_TIME_MIN(a,b) ((ltt_time_compare((a),(b)) < 0) ? (a) : (b))
75 #define LTT_TIME_MAX(a,b) ((ltt_time_compare((a),(b)) > 0) ? (a) : (b))
77 #define MAX_TV_SEC_TO_DOUBLE 0x7FFFFF
78 static inline double ltt_time_to_double(LttTime t1
)
80 /* We lose precision if tv_sec is > than (2^23)-1
82 * Max values that fits in a double (53 bits precision on normalised
84 * tv_nsec : NANOSECONDS_PER_SECONDS : 2^30
86 * So we have 53-30 = 23 bits left for tv_sec.
89 g_assert(t1
.tv_sec
<= MAX_TV_SEC_TO_DOUBLE
);
90 if(t1
.tv_sec
> MAX_TV_SEC_TO_DOUBLE
)
91 g_warning("Precision loss in conversion LttTime to double");
93 return ((double)t1
.tv_sec
* NANOSECONDS_PER_SECOND
) + (double)t1
.tv_nsec
;
97 static inline LttTime
ltt_time_from_double(double t1
)
99 /* We lose precision if tv_sec is > than (2^23)-1
101 * Max values that fits in a double (53 bits precision on normalised
103 * tv_nsec : NANOSECONDS_PER_SECONDS : 2^30
105 * So we have 53-30 = 23 bits left for tv_sec.
108 g_assert(t1
<= MAX_TV_SEC_TO_DOUBLE
);
109 if(t1
> MAX_TV_SEC_TO_DOUBLE
)
110 g_warning("Conversion from non precise double to LttTime");
113 res
.tv_sec
= t1
/(double)NANOSECONDS_PER_SECOND
;
114 res
.tv_nsec
= (t1
- (res
.tv_sec
*NANOSECONDS_PER_SECOND
));
118 /* Use ltt_time_to_double and ltt_time_from_double to check for lack
121 static inline LttTime
ltt_time_mul(LttTime t1
, double d
)
125 double time_double
= ltt_time_to_double(t1
);
127 time_double
= time_double
* d
;
129 res
= ltt_time_from_double(time_double
);
134 /* What is that ? (Mathieu) */
141 sec
= t1
.tv_sec
/ (double)d
;
143 res
.tv_nsec
= t1
.tv_nsec
/ (double)d
+ (sec
- res
.tv_sec
) *
144 NANOSECONDS_PER_SECOND
;
145 res
.tv_sec
+= res
.tv_nsec
/ NANOSECONDS_PER_SECOND
;
146 res
.tv_nsec
%= NANOSECONDS_PER_SECOND
;
153 /* Use ltt_time_to_double and ltt_time_from_double to check for lack
156 static inline LttTime
ltt_time_div(LttTime t1
, double d
)
160 double time_double
= ltt_time_to_double(t1
);
162 time_double
= time_double
/ d
;
164 res
= ltt_time_from_double(time_double
);
173 sec
= t1
.tv_sec
/ (double)f
;
175 res
.tv_nsec
= t1
.tv_nsec
/ (double)f
+ (sec
- res
.tv_sec
) *
176 NANOSECONDS_PER_SECOND
;
177 res
.tv_sec
+= res
.tv_nsec
/ NANOSECONDS_PER_SECOND
;
178 res
.tv_nsec
%= NANOSECONDS_PER_SECOND
;
183 static inline guint64
ltt_time_to_uint64(LttTime t1
)
185 return (guint64
)t1
.tv_sec
*NANOSECONDS_PER_SECOND
186 + (guint64
)t1
.tv_nsec
;
190 #define MAX_TV_SEC_TO_UINT64 0x3FFFFFFFFFFFFFFFULL
191 static inline LttTime
ltt_time_from_uint64(guint64 t1
)
193 /* We lose precision if tv_sec is > than (2^62)-1
196 g_assert(t1
<= MAX_TV_SEC_TO_UINT64
);
197 if(t1
> MAX_TV_SEC_TO_UINT64
)
198 g_warning("Conversion from non precise uint64 to LttTime");
201 res
.tv_sec
= t1
/NANOSECONDS_PER_SECOND
;
202 res
.tv_nsec
= (t1
- res
.tv_sec
*NANOSECONDS_PER_SECOND
);