1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
/**************************************************************************
*
* Copyright 2008-2010 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/**
* @file
* OS independent time-manipulation functions.
*
* @author Jose Fonseca <jfonseca@vmware.com>
*/
#ifndef _OS_TIME_H_
#define _OS_TIME_H_
#include <stdbool.h>
#include <stdint.h>
#include <time.h>
#ifdef __cplusplus
extern "C" {
#endif
#define ONE_SECOND_IN_NS INT64_C(1000000000)
#define OS_TIMEOUT_INFINITE 0xffffffffffffffffull
/*
* Get the current time in nanoseconds from an unknown base.
*/
int64_t
os_time_get_nano(void);
/*
* Get the current time in microseconds from an unknown base.
*/
static inline int64_t
os_time_get(void)
{
return os_time_get_nano() / 1000;
}
static inline struct tm *
os_localtime(const time_t *timer, struct tm *buf)
{
#ifdef _WIN32
return localtime_s(buf, timer) ? NULL : buf;
#else
return localtime_r(timer, buf);
#endif
}
/*
* Sleep.
*/
void
os_time_sleep(int64_t usecs);
/*
* Helper function for detecting time outs, taking in account overflow.
*
* Returns true if the current time has elapsed beyond the specified interval.
*/
static inline bool
os_time_timeout(int64_t start,
int64_t end,
int64_t curr)
{
if (start <= end)
return !(start <= curr && curr < end);
else
return !((start <= curr) || (curr < end));
}
/**
* Convert a relative timeout in nanoseconds into an absolute timeout,
* in other words, it returns current time + timeout.
* os_time_get_nano() must be monotonic.
* OS_TIMEOUT_INFINITE is passed through unchanged. If the calculation
* overflows, OS_TIMEOUT_INFINITE is returned.
*/
int64_t
os_time_get_absolute_timeout(uint64_t timeout);
/**
* Wait until the variable at the given memory location is zero.
*
* \param var variable
* \param timeout timeout in ns, can be anything from 0 (no wait) to
* OS_TIMEOUT_INFINITE (wait forever)
* \return true if the variable is zero
*/
bool
os_wait_until_zero(volatile int *var, uint64_t timeout);
/**
* Wait until the variable at the given memory location is zero.
* The timeout is the absolute time when the waiting should stop. If it is
* less than or equal to the current time, it only returns the status and
* doesn't wait. OS_TIMEOUT_INFINITE waits forever. This requires that
* os_time_get_nano is monotonic.
*
* \param var variable
* \param timeout the time in ns when the waiting should stop
* \return true if the variable is zero
*/
bool
os_wait_until_zero_abs_timeout(volatile int *var, int64_t timeout);
#ifdef __cplusplus
}
#endif
#endif /* _OS_TIME_H_ */
|
