private void SetFrequency(uint period)
{
uint sec = period / 1_000_000;
uint ns = (period - (sec * 1_000_000)) * 1_000;
var itval = new LinuxInterop.itimerspec
{
it_interval = new LinuxInterop.timespec
{
tv_sec = sec,
tv_nsec = ns
},
it_value = new LinuxInterop.timespec
{
tv_sec = sec,
tv_nsec = ns
}
};
int ret = LinuxInterop.timerfd_settime(this.fileDescriptor, 0, itval, null);
if (ret != 0)
{
throw new Exception($"Error from timerfd_settime = {ret}");
}
}
public void Dispose()
{
this.cts.Cancel();
LinuxInterop.close(this.fileDescriptor);
// Release trigger
this.triggerEvent.Set();
}
private long Wait()
{
// Wait for the next timer event. If we have missed any the number is written to "missed"
byte[] buf = new byte[8];
var handle = GCHandle.Alloc(buf, GCHandleType.Pinned);
IntPtr pointer = handle.AddrOfPinnedObject();
int ret = LinuxInterop.read(this.fileDescriptor, pointer, buf.Length);
// ret = bytes read
long missed = Marshal.ReadInt64(pointer);
handle.Free();
if (ret < 0)
{
throw new Exception($"Error in read = {ret}");
}
return(missed);
}
public LinuxTimer()
{
this.fileDescriptor = LinuxInterop.timerfd_create(LinuxInterop.ClockIds.CLOCK_MONOTONIC, 0);
ThreadPool.QueueUserWorkItem(Scheduler);
}