greenplumn CWallClock 代码
文件路径：/src/backend/gporca/libgpos/src/common/CWallClock.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp
/
/ @filename:
/ CWallClock.cpp
/
/ @doc:
/ Implementation of wall clock timer
/---------------------------------------------------------------------------
#include "gpos/common/CWallClock.h"
#include "gpos/base.h"
#include "gpos/common/syslibwrapper.h"
using namespace gpos;
/---------------------------------------------------------------------------
/ @function:
/ CWallClock::ElapsedUS
/
/ @doc:
/ Wall-clock time in micro-seconds since object construction
/
/---------------------------------------------------------------------------
ULONG
CWallClock::ElapsedUS() const
{
timeval time;
syslib::GetTimeOfDay(&time, nullptr /*timezone*/);
ULONG diff = (ULONG)(((time.tv_sec - m_time.tv_sec) * GPOS_USEC_IN_SEC) +
(time.tv_usec - m_time.tv_usec));
return diff;
}
/---------------------------------------------------------------------------
/ @function:
/ CWallClock::Restart
/
/ @doc:
/ Restart timer
/
/---------------------------------------------------------------------------
void
CWallClock::Restart()
{
syslib::GetTimeOfDay(&m_time, nullptr /*timezone*/);
}
/ EOF