90 lines
2.4 KiB
C++
90 lines
2.4 KiB
C++
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/*
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* Copyright (C) 2011 Intel Corporation
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) version 3.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#ifndef TIMER_H
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#define TIMER_H
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#include <unistd.h>
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#include <sys/time.h>
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#include <syncevo/declarations.h>
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SE_BEGIN_CXX
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/**
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* A timer helper to check whether now is timeout according to
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* user's setting. Timeout is calculated in milliseconds
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*/
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class Timer {
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timeval m_startTime; ///< start time
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unsigned long m_timeoutMs; ///< timeout in milliseconds, set by user
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/**
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* calculate duration between now and start time
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* return value is in milliseconds
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*/
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unsigned long duration(const timeval &minuend, const timeval &subtrahend)
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{
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unsigned long result = 0;
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if(minuend.tv_sec > subtrahend.tv_sec ||
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(minuend.tv_sec == subtrahend.tv_sec && minuend.tv_usec > subtrahend.tv_usec)) {
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result = minuend.tv_sec - subtrahend.tv_sec;
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result *= 1000;
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result += (minuend.tv_usec - subtrahend.tv_usec) / 1000;
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}
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return result;
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}
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public:
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/**
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* constructor
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* @param timeoutMs timeout in milliseconds
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*/
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Timer(unsigned long timeoutMs = 0) : m_timeoutMs(timeoutMs)
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{
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reset();
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}
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/**
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* reset the timer and mark start time as current time
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*/
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void reset() { gettimeofday(&m_startTime, NULL); }
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/**
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* check whether it is timeout
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*/
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bool timeout()
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{
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return timeout(m_timeoutMs);
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}
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/**
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* check whether the duration timer records is longer than the given duration
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*/
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bool timeout(unsigned long timeoutMs)
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{
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timeval now;
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gettimeofday(&now, NULL);
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return duration(now, m_startTime) >= timeoutMs;
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}
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};
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SE_END_CXX
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#endif // TIMER_H
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