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#pragma once
#include "datetime.h"
#include <util/generic/noncopyable.h>
#ifdef _linux_
#include <util/system/yassert.h>
#include <errno.h>
#include <sys/timerfd.h>
struct TTimerFd: public TNonCopyable {
int Fd;
TTimerFd() {
Fd = timerfd_create(CLOCK_MONOTONIC, 0);
Y_VERIFY(Fd != -1, "timerfd_create(CLOCK_MONOTONIC, 0) -> -1; errno:%d: %s", int(errno), strerror(errno));
}
~TTimerFd() {
close(Fd);
}
void Set(ui64 ts) {
ui64 now = GetCycleCountFast();
Arm(now >= ts? 1: NHPTimer::GetSeconds(ts - now) * 1e9);
}
void Reset() {
Arm(0); // disarm timer
}
void Wait() {
ui64 expirations;
ssize_t s = read(Fd, &expirations, sizeof(ui64));
Y_UNUSED(s); // Y_VERIFY(s == sizeof(ui64));
}
void Wake() {
Arm(1);
}
private:
void Arm(ui64 ns) {
struct itimerspec spec;
spec.it_value.tv_sec = ns / 1'000'000'000;
spec.it_value.tv_nsec = ns % 1'000'000'000;
spec.it_interval.tv_sec = 0;
spec.it_interval.tv_nsec = 0;
int ret = timerfd_settime(Fd, 0, &spec, nullptr);
Y_VERIFY(ret != -1, "timerfd_settime(%d, 0, %" PRIu64 "ns, 0) -> %d; errno:%d: %s", Fd, ns, ret, int(errno), strerror(errno));
}
};
#else
struct TTimerFd: public TNonCopyable {
int Fd = 0;
void Set(ui64) {}
void Reset() {}
void Wait() {}
void Wake() {}
};
#endif
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