定時器實現——基於Linux系統

先打個卡，下一篇將把各個系統上的定時器code總結一下。包括秒級、微秒級。

本篇爲根據工程需求，在Linux系統上寫的一個簡單的定時器。

#include <sys/time.h>
#include <string>

class Timer
{
private:
    /* data */
    timeval T_starttime;
    timeval T_pausetime;
    bool T_isstop;
    time_t T_timep;
    struct tm *T_p;
public:
    double d_interval;
public:
    Timer();
    ~Timer();
    bool isStop();
    void Start();
    void Stop();
    bool IsAlarm(double);
    char* TimeStamp();
};

Timer::Timer()
{
    T_isstop = true;
}

Timer::~Timer()
{
}

bool Timer::isStop()
{
    if(T_isstop)    return true;
    else        return false;  
}

void Timer::Start()
{
    if(T_isstop)
    {
        gettimeofday(&T_starttime,0);
        T_isstop = false;
    }
    else 
    {
        printf("Warning: Already started!");
        return;
    }
    
}

void Timer::Stop()
{
    if(T_isstop)
    {
        printf("Warning:Already Stopped!");
        return;
    }
    else
    {
        T_isstop = true;
        return;
    }
    
}

bool Timer::IsAlarm(double interval)
{
    gettimeofday(&T_pausetime,0);
    double timeuse=1000000*(T_pausetime.tv_sec-T_starttime.tv_sec)+ \
                    T_pausetime.tv_usec-T_starttime.tv_usec;
    timeuse /=1000000;
    // printf("timeuse:%f\n",timeuse);
    if(timeuse>=interval)
    {
        T_isstop = true;
        Start();
        return true;
    }
    else
    {
        return false;
    }
}

char* Timer::TimeStamp()
{
    time(&T_timep);
    T_p=localtime(&T_timep);
    std::string s_time;
    s_time = std::to_string(T_p->tm_hour) + "-"+std::to_string(T_p->tm_min) \
            + "-" + std::to_string(T_p->tm_sec);
    char *p_time=(char*)s_time.c_str();
    return p_time;
}