1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2004 Cluster File Systems, Inc.
5 * Author: Nikita Danilov <nikita@clusterfs.com>
7 * This file is part of Lustre, http://www.lustre.org.
9 * Lustre is free software; you can redistribute it and/or modify it under the
10 * terms of version 2 of the GNU General Public License as published by the
11 * Free Software Foundation.
13 * Lustre is distributed in the hope that it will be useful, but WITHOUT ANY
14 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
15 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
18 * You should have received a copy of the GNU General Public License along
19 * with Lustre; if not, write to the Free Software Foundation, Inc., 675 Mass
20 * Ave, Cambridge, MA 02139, USA.
22 * Implementation of portable time API for XNU kernel
26 #ifndef __LIBCFS_DARWIN_DARWIN_TIME_H__
27 #define __LIBCFS_DARWIN_DARWIN_TIME_H__
29 #ifndef __LIBCFS_LIBCFS_H__
30 #error Do not #include this file directly. #include <libcfs/libcfs.h> instead
33 /* Portable time API */
36 * Platform provides three opaque data-types:
38 * cfs_time_t represents point in time. This is internal kernel
39 * time rather than "wall clock". This time bears no
40 * relation to gettimeofday().
42 * cfs_duration_t represents time interval with resolution of internal
45 * cfs_fs_time_t represents instance in world-visible time. This is
46 * used in file-system time-stamps
48 * cfs_time_t cfs_time_current(void);
49 * cfs_time_t cfs_time_add (cfs_time_t, cfs_duration_t);
50 * cfs_duration_t cfs_time_sub (cfs_time_t, cfs_time_t);
51 * int cfs_time_before (cfs_time_t, cfs_time_t);
52 * int cfs_time_beforeq(cfs_time_t, cfs_time_t);
54 * cfs_duration_t cfs_duration_build(int64_t);
56 * time_t cfs_duration_sec (cfs_duration_t);
57 * void cfs_duration_usec(cfs_duration_t, struct timeval *);
58 * void cfs_duration_nsec(cfs_duration_t, struct timespec *);
60 * void cfs_fs_time_current(cfs_fs_time_t *);
61 * time_t cfs_fs_time_sec (cfs_fs_time_t *);
62 * void cfs_fs_time_usec (cfs_fs_time_t *, struct timeval *);
63 * void cfs_fs_time_nsec (cfs_fs_time_t *, struct timespec *);
64 * int cfs_fs_time_before (cfs_fs_time_t *, cfs_fs_time_t *);
65 * int cfs_fs_time_beforeq(cfs_fs_time_t *, cfs_fs_time_t *);
72 #define ONE_BILLION ((u_int64_t)1000000000)
73 #define ONE_MILLION 1000000
76 #include <sys/types.h>
77 #include <sys/systm.h>
79 #include <sys/kernel.h>
81 #include <mach/mach_types.h>
82 #include <mach/time_value.h>
83 #include <kern/clock.h>
84 #include <sys/param.h>
86 #include <libcfs/darwin/darwin-types.h>
87 #include <libcfs/darwin/darwin-utils.h>
88 #include <libcfs/darwin/darwin-lock.h>
91 * There are three way to measure time in OS X:
93 * 2. absolute time (abstime unit equal to the length of one bus cycle),
94 * schedule of thread/timer are counted by absolute time, but abstime
95 * in different mac can be different also, so we wouldn't use it.
96 * 3. clock interval (1sec = 100hz). But clock interval only taken by KPI
99 * We use nanoseconds (uptime, not calendar time)
101 * clock_get_uptime() :get absolute time since bootup.
102 * nanouptime() :get nanoseconds since bootup
103 * microuptime() :get microseonds since bootup
104 * nanotime() :get nanoseconds since epoch
105 * microtime() :get microseconds since epoch
107 typedef u_int64_t cfs_time_t; /* nanoseconds */
108 typedef int64_t cfs_duration_t;
110 #define CFS_TIME_T "%llu"
111 #define CFS_DURATION_T "%lld"
113 typedef struct timeval cfs_fs_time_t;
115 static inline cfs_time_t cfs_time_current(void)
117 struct timespec instant;
119 nanouptime(&instant);
120 return ((u_int64_t)instant.tv_sec) * NSEC_PER_SEC + instant.tv_nsec;
123 static inline time_t cfs_time_current_sec(void)
125 struct timespec instant;
127 nanouptime(&instant);
128 return instant.tv_sec;
131 static inline cfs_time_t cfs_time_add(cfs_time_t t, cfs_duration_t d)
136 static inline cfs_duration_t cfs_time_sub(cfs_time_t t1, cfs_time_t t2)
141 static inline int cfs_time_before(cfs_time_t t1, cfs_time_t t2)
143 return (int64_t)t1 - (int64_t)t2 < 0;
146 static inline int cfs_time_beforeq(cfs_time_t t1, cfs_time_t t2)
148 return (int64_t)t1 - (int64_t)t2 <= 0;
151 static inline void cfs_fs_time_current(cfs_fs_time_t *t)
153 microtime((struct timeval *)t);
156 static inline time_t cfs_fs_time_sec(cfs_fs_time_t *t)
161 static inline void cfs_fs_time_usec(cfs_fs_time_t *t, struct timeval *v)
166 static inline void cfs_fs_time_nsec(cfs_fs_time_t *t, struct timespec *s)
168 s->tv_sec = t->tv_sec;
169 s->tv_nsec = t->tv_usec * NSEC_PER_USEC;
172 static inline cfs_duration_t cfs_time_seconds(int seconds)
174 return (NSEC_PER_SEC * (int64_t)seconds);
178 * internal helper function used by cfs_fs_time_before*()
180 static inline int64_t __cfs_fs_time_flat(cfs_fs_time_t *t)
182 return ((int64_t)t->tv_sec)*NSEC_PER_SEC + t->tv_usec*NSEC_PER_USEC;
185 static inline int cfs_fs_time_before(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
187 return __cfs_fs_time_flat(t1) - __cfs_fs_time_flat(t2) < 0;
190 static inline int cfs_fs_time_beforeq(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
192 return __cfs_fs_time_flat(t1) - __cfs_fs_time_flat(t2) <= 0;
195 static inline time_t cfs_duration_sec(cfs_duration_t d)
197 return d / NSEC_PER_SEC;
200 static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s)
202 s->tv_sec = d / NSEC_PER_SEC;
203 s->tv_usec = (d - ((int64_t)s->tv_sec) * NSEC_PER_SEC) / NSEC_PER_USEC;
206 static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s)
208 s->tv_sec = d / NSEC_PER_SEC;
209 s->tv_nsec = d - ((int64_t)s->tv_sec) * NSEC_PER_SEC;
212 #define cfs_time_current_64 cfs_time_current
213 #define cfs_time_add_64 cfs_time_add
214 #define cfs_time_shift_64 cfs_time_shift
215 #define cfs_time_before_64 cfs_time_before
216 #define cfs_time_beforeq_64 cfs_time_beforeq
219 * One jiffy (in nanoseconds)
221 * osfmk/kern/sched_prim.c
222 * #define DEFAULT_PREEMPTION_RATE 100
224 #define CFS_TICK (NSEC_PER_SEC / (u_int64_t)100)
226 #define LTIME_S(t) (t)
234 #include <libcfs/user-time.h>
239 /* __LIBCFS_DARWIN_DARWIN_TIME_H__ */
243 * c-indentation-style: "K&R"