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10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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34 * libcfs/include/libcfs/user-time.h
36 * Implementation of portable time API for user-level.
38 * Author: Nikita Danilov <nikita@clusterfs.com>
41 #ifndef __LIBCFS_USER_TIME_H__
42 #define __LIBCFS_USER_TIME_H__
44 /* Portable time API */
47 * Platform provides three opaque data-types:
49 * cfs_time_t represents point in time. This is internal kernel
50 * time rather than "wall clock". This time bears no
51 * relation to gettimeofday().
53 * cfs_duration_t represents time interval with resolution of internal
56 * cfs_time_t cfs_time_current(void);
57 * cfs_time_t cfs_time_add (cfs_time_t, cfs_duration_t);
58 * cfs_duration_t cfs_time_sub (cfs_time_t, cfs_time_t);
59 * int cfs_time_before (cfs_time_t, cfs_time_t);
60 * int cfs_time_beforeq(cfs_time_t, cfs_time_t);
62 * cfs_duration_t cfs_duration_build(int64_t);
64 * time_t cfs_duration_sec (cfs_duration_t);
65 * void cfs_duration_usec(cfs_duration_t, struct timeval *);
66 * void cfs_duration_nsec(cfs_duration_t, struct timespec *);
82 #define ONE_BILLION ((uint64_t)1000000000)
83 #define ONE_MILLION 1000000
86 * Liblustre. time(2) based implementation.
89 typedef time_t cfs_time_t;
90 typedef time_t cfs_duration_t;
92 #define cfs_time_before(a, b) ((long)(a) - (long)(b) < 0)
93 #define cfs_time_beforeq(a, b) ((long)(b) - (long)(a) >= 0)
95 static inline cfs_time_t cfs_time_current(void)
100 static inline cfs_duration_t cfs_time_seconds(cfs_time_t seconds)
105 static inline time_t cfs_time_current_sec(void)
107 return cfs_time_seconds(cfs_time_current());
110 static inline cfs_duration_t cfs_duration_build(int64_t nano)
112 return (cfs_duration_t) (nano / ONE_BILLION);
115 static inline time_t cfs_duration_sec(cfs_duration_t d)
120 static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s)
126 static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s)
134 #define cfs_time_current_64 cfs_time_current
135 #define cfs_time_add_64 cfs_time_add
136 #define cfs_time_shift_64 cfs_time_shift
137 #define cfs_time_before_64 cfs_time_before
138 #define cfs_time_beforeq_64 cfs_time_beforeq
140 /* XXX needs to move to arch specific header or configured */
142 #define CFS_TIME_T "%lu"
145 #define CFS_DURATION_T "%ld"
150 /* __LIBCFS_USER_TIME_H__ */
154 * c-indentation-style: "K&R"