TimerState.computePollTimeout

int computePollTimeout(Slot)(int  requestedTimeoutMs,
          const  ref  TimerWheel timerWheel,
          scope  const(Slot)[]  slots)

const pure @safe nothrow @nogc

Compute the poll timeout considering timer deadlines and idle watchers.

Returns the most restrictive timeout between the requested timeout, the next timer deadline, and the presence of idle watchers.

`requestedTimeoutMs`	Caller-requested timeout in milliseconds.
`timerWheel`	Timer wheel to check for next deadline.
`slots`	Watcher slot array to check for idle watchers.

The adjusted timeout in milliseconds, or 0 if idle watchers exist.