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
|
/*-
* Copyright (c) 2014-2016 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __wt_epoch --
* Return the time since the Epoch.
*/
void
__wt_epoch(WT_SESSION_IMPL *session, struct timespec *tsp)
WT_GCC_FUNC_ATTRIBUTE((visibility("default")))
{
struct timespec tmp;
WT_DECL_RET;
/*
* This function doesn't return an error, but panics on failure (which
* should never happen, it's done this way to simplify error handling
* in the caller). However, some compilers complain about using garbage
* values. Initializing the values avoids the complaint.
*/
tsp->tv_sec = 0;
tsp->tv_nsec = 0;
/*
* Read into a local variable so that we're comparing the correct
* value when we check for monotonic increasing time. There are
* many places we read into an unlocked global variable.
*/
#if defined(HAVE_CLOCK_GETTIME)
WT_SYSCALL_RETRY(clock_gettime(CLOCK_REALTIME, &tmp), ret);
if (ret == 0) {
__wt_time_check_monotonic(session, &tmp);
tsp->tv_sec = tmp.tv_sec;
tsp->tv_nsec = tmp.tv_nsec;
return;
}
WT_PANIC_MSG(session, ret, "clock_gettime");
#elif defined(HAVE_GETTIMEOFDAY)
{
struct timeval v;
WT_SYSCALL_RETRY(gettimeofday(&v, NULL), ret);
if (ret == 0) {
tmp.tv_sec = v.tv_sec;
tmp.tv_nsec = v.tv_usec * WT_THOUSAND;
__wt_time_check_monotonic(session, &tmp);
*tsp = tmp;
return;
}
WT_PANIC_MSG(session, ret, "gettimeofday");
}
#else
NO TIME-OF-DAY IMPLEMENTATION: see src/os_posix/os_time.c
#endif
}
|
