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0f763db2
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rocksdb
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体验新版 GitCode,发现更多精彩内容 >>
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0f763db2
编写于
9月 02, 2015
作者:
S
Siying Dong
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差异文件
Merge pull request #705 from yuslepukhin/rate_limiter_fix
Make WinEnv::NowMicros return system time
上级
20c44fef
f14c3363
变更
3
隐藏空白更改
内联
并排
Showing
3 changed file
with
23 addition
and
9 deletion
+23
-9
include/rocksdb/env.h
include/rocksdb/env.h
+2
-0
port/win/env_win.cc
port/win/env_win.cc
+17
-8
port/win/port_win.cc
port/win/port_win.cc
+4
-1
未找到文件。
include/rocksdb/env.h
浏览文件 @
0f763db2
...
...
@@ -257,6 +257,8 @@ class Env {
// Returns the number of micro-seconds since some fixed point in time. Only
// useful for computing deltas of time.
// However, it is often used as system time such as in GenericRateLimiter
// and other places so a port needs to return system time in order to work.
virtual
uint64_t
NowMicros
()
=
0
;
// Returns the number of nano-seconds since some fixed point in time. Only
...
...
port/win/env_win.cc
浏览文件 @
0f763db2
...
...
@@ -1816,15 +1816,24 @@ class WinEnv : public Env {
}
virtual
uint64_t
NowMicros
()
override
{
// all std::chrono clocks on windows have the same resolution that is only
// On Windows 8 and Windows 2012 Server
// GetSystemTimePreciseAsFileTime(¤t_time) can be used
// all std::chrono clocks on windows proved to return
// values that may repeat that is not good enough for some uses.
const
int64_t
c_UnixEpochStartTicks
=
116444736000000000
i64
;
const
int64_t
c_FtToMicroSec
=
10
;
// This interface needs to return system time and not
// just any microseconds because it is often used as an argument
// to TimedWait() on condition variable
FILETIME
ftSystemTime
;
GetSystemTimePreciseAsFileTime
(
&
ftSystemTime
);
LARGE_INTEGER
li
;
QueryPerformanceCounter
(
&
li
);
// Convert to nanoseconds first to avoid loss of precision
// and divide by frequency
li
.
QuadPart
*=
std
::
micro
::
den
;
li
.
QuadPart
/=
perf_counter_frequency_
;
li
.
LowPart
=
ftSystemTime
.
dwLowDateTime
;
li
.
HighPart
=
ftSystemTime
.
dwHighDateTime
;
// Subtract unix epoch start
li
.
QuadPart
-=
c_UnixEpochStartTicks
;
// Convert to microsecs
li
.
QuadPart
/=
c_FtToMicroSec
;
return
li
.
QuadPart
;
}
...
...
port/win/port_win.cc
浏览文件 @
0f763db2
...
...
@@ -88,13 +88,16 @@ bool CondVar::TimedWait(uint64_t abs_time_us) {
using
namespace
std
::
chrono
;
// MSVC++ library implements wait_until in terms of wait_for so
// there is not an absolute wait anyway.
microseconds
usAbsTime
(
abs_time_us
);
microseconds
usNow
(
duration_cast
<
microseconds
>
(
system_clock
::
now
().
time_since_epoch
()));
microseconds
relTimeUs
=
(
usAbsTime
>
usNow
)
?
(
usAbsTime
-
usNow
)
:
microseconds
::
zero
();
std
::
_C
v_status
cvStatus
=
cv_
.
wait_for
(
mu_
->
getLock
(),
relTimeUs
);
std
::
c
v_status
cvStatus
=
cv_
.
wait_for
(
mu_
->
getLock
(),
relTimeUs
);
#ifndef NDEBUG
mu_
->
locked_
=
true
;
...
...
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