libH/UtilTime.cpp

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/*
  
  Copyright (c) 2007, Tim Burrell
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at 

        http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and 
  limitations under the License. 
  
*/

#include "UtilTime.hpp"
#include "../libH/Debug.hpp"
#include <sys/time.h>
#include <math.h>

using namespace H;

// Defines / Type Defs

// Construction

UtilTime::UtilTime() {
        updateElapsedTimer();
}

UtilTime::~UtilTime() {
}

// Class Body

unsigned long UtilTime::getTicks() {
        struct timeval tv;
        gettimeofday(&tv, NULL);

        /*
        * This will wrap around approximately every 4000 seconds, i.e.
        * just over an hour, which is more than enough.
        */
        return tv.tv_sec * 1000000 + tv.tv_usec;
}

unsigned long UtilTime::getElapsedTime() {
        return getTicks() - mLastUpdate;
}

int UtilTime::nanoSleep(int nanoSecs) {
        struct  timespec sleepTime;
        struct  timespec sleepRet;

        sleepTime.tv_sec = 0;
        sleepTime.tv_nsec = nanoSecs;
        sleepRet.tv_sec = 0;
        sleepRet.tv_nsec = 0;
        
        nanosleep(&sleepTime, &sleepRet);
        
        return sleepRet.tv_nsec;
}

int UtilTime::nanoSleepSecs(int nanoSecs) {
        struct  timespec sleepTime;
        struct  timespec sleepRet;

        sleepTime.tv_sec = nanoSecs;
        sleepTime.tv_nsec = 0;
        sleepRet.tv_sec = 0;
        sleepRet.tv_nsec = 0;
        
        nanosleep(&sleepTime, &sleepRet);
        
        return sleepRet.tv_nsec;
}

void UtilTime::sleep(float Seconds) {
        struct  timespec sleepTime;
        struct  timespec sleepRet;
        
        int IntSecs = (int) floor(Seconds);
        float Remainder = Seconds - float(IntSecs);

        sleepTime.tv_sec = IntSecs;
        sleepTime.tv_nsec = (long) (Remainder * 1000000000);
        
        nanosleep(&sleepTime, &sleepRet);
}

void    UtilTime::updateElapsedTimer() {
        mLastUpdate = getTicks();
}

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