greenplumn CWallClock 源码
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
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