1 /* xtime -- extended-resolution integer timestamps
3 Copyright (C) 2005-2006, 2009-2020 Free Software Foundation, Inc.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
18 /* Written by Paul Eggert. */
23 #ifndef _GL_INLINE_HEADER_BEGIN
24 #error "Please include config.h first."
26 _GL_INLINE_HEADER_BEGIN
28 # define XTIME_INLINE _GL_INLINE
31 /* xtime_t is a signed type used for timestamps. It is an integer
32 type that is a count of nanoseconds. */
33 typedef long long int xtime_t
;
34 #define XTIME_PRECISION 1000000000
40 /* Return an extended time value that contains S seconds and NS
41 nanoseconds. S and NS should be nonnegative; otherwise, integer
42 overflow can occur even if the result is in range. */
44 xtime_make (xtime_t s
, long int ns
)
46 return XTIME_PRECISION
* s
+ ns
;
49 /* The following functions split an extended time value:
50 T = XTIME_PRECISION * xtime_sec (T) + xtime_nsec (T)
51 with 0 <= xtime_nsec (T) < XTIME_PRECISION. */
53 /* Return the number of seconds in T, which must be nonnegative. */
55 xtime_nonnegative_sec (xtime_t t
)
57 return t
/ XTIME_PRECISION
;
60 /* Return the number of seconds in T. */
64 return (t
+ (t
< 0)) / XTIME_PRECISION
- (t
< 0);
67 /* Return the number of nanoseconds in T, which must be nonnegative. */
69 xtime_nonnegative_nsec (xtime_t t
)
71 return t
% XTIME_PRECISION
;
74 /* Return the number of nanoseconds in T. */
76 xtime_nsec (xtime_t t
)
78 long int ns
= t
% XTIME_PRECISION
;
80 ns
+= XTIME_PRECISION
;