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CppTimer.h
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#ifndef __CPP_TIMER_H_
#define __CPP_TIMER_H_
/**
* GNU GENERAL PUBLIC LICENSE
* Version 3, 29 June 2007
*
* (C) 2020-2024, Bernd Porr <[email protected]>
*
* This is inspired by the timer_create man page.
**/
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <time.h>
#include <thread>
#include <sys/timerfd.h>
/**
* Enumeration of CppTimer types
**/
enum cppTimerType_t
{
PERIODIC,
ONESHOT
};
/**
* Timer class which repeatedly fires. It's wrapper around the
* POSIX per-process timer.
**/
class CppTimer
{
public:
/**
* Starts the timer. The timer fires first after
* the specified time in nanoseconds and then at
* that interval in PERIODIC mode. In ONESHOT mode
* the timer fires once after the specified time in
* nanoseconds.
* @param nanosecs Time in nanoseconds
* @param type Either PERIODIC or ONESHOT
**/
virtual void startns(long nanosecs, cppTimerType_t t = PERIODIC) {
if (uthread.joinable()) uthread.join();
if (running) return;
timerType = t;
if (fd < 0)
throw("Could not start timer");
switch (timerType)
{
case (PERIODIC):
//starts after specified period of nanoseconds
its.it_value.tv_sec = nanosecs / 1000000000;
its.it_value.tv_nsec = nanosecs % 1000000000;
its.it_interval.tv_sec = nanosecs / 1000000000;
its.it_interval.tv_nsec = nanosecs % 1000000000;
break;
case (ONESHOT):
//fires once after specified period of nanoseconds
its.it_value.tv_sec = nanosecs / 1000000000;
its.it_value.tv_nsec = nanosecs % 1000000000;
its.it_interval.tv_sec = 0;
its.it_interval.tv_nsec = 0;
break;
}
if (timerfd_settime(fd, 0, &its, NULL) == -1)
throw("Could not start timer");
uthread = std::thread(&CppTimer::worker,this);
}
/**
* Starts the timer. The timer fires first after
* the specified time in milliseconds and then at
* that interval in PERIODIC mode. In ONESHOT mode
* the timer fires once after the specified time in
* milliseconds.
* @param millisecs Time in milliseconds
* @param type Either PERIODIC or ONESHOT
**/
virtual void startms(long millisecs, cppTimerType_t t = PERIODIC) {
if (uthread.joinable()) uthread.join();
if (running) return;
timerType = t;
if (fd < 0)
throw("Could not start timer");
switch (timerType)
{
case (PERIODIC):
//starts after specified period of milliseconds
its.it_value.tv_sec = millisecs / 1000;
its.it_value.tv_nsec = (millisecs % 1000) * 1000000;
its.it_interval.tv_sec = millisecs / 1000;
its.it_interval.tv_nsec = (millisecs % 1000) * 1000000;
break;
case (ONESHOT):
//fires once after specified period of milliseconds
its.it_value.tv_sec = millisecs / 1000;
its.it_value.tv_nsec = (millisecs % 1000) * 1000000;
its.it_interval.tv_sec = 0;
its.it_interval.tv_nsec = 0;
break;
}
if (timerfd_settime(fd, 0, &its, NULL) == -1)
throw("Could not start timer");
uthread = std::thread(&CppTimer::worker,this);
}
/**
* Stops the timer by disarming it. It can be re-started
* with start().
**/
virtual void stop() {
running = false;
if (uthread.joinable()) uthread.join();
}
/**
* Destructor disarms the timer, deletes it and
* disconnect the signal handler.
**/
virtual ~CppTimer() {
stop();
close(fd);
}
protected:
/**
* Abstract function which needs to be implemented by the children.
* This is called every time the timer fires.
**/
virtual void timerEvent() = 0;
private:
cppTimerType_t timerType;
const int fd = timerfd_create(CLOCK_MONOTONIC, 0);
struct itimerspec its;
bool running = false;
std::thread uthread;
void worker() {
running = true;
while (running) {
uint64_t exp;
const long int s = read(fd, &exp, sizeof(uint64_t));
if (s != sizeof(uint64_t) ) {
throw "Timer didn't work.";
}
timerEvent();
if (ONESHOT == timerType) running = false;
}
// disarm
struct itimerspec itsnew;
itsnew.it_value.tv_sec = 0;
itsnew.it_value.tv_nsec = 0;
itsnew.it_interval.tv_sec = 0;
itsnew.it_interval.tv_nsec = 0;
timerfd_settime(fd, 0, &itsnew, &its);
}
};
#endif