Contents

module Ztimer
  class Watcher

    def initialize(&callback)
      @thread   = nil
      @slots    = Ztimer::SortedStore.new
      @callback = callback
      @lock     = Mutex.new
      @mutex    = Mutex.new
    end

    def << (slot)
      @mutex.synchronize do
        @slots << slot
        if @slots.first == slot
          run
        end
      end
    end

    def jobs
      return @slots.size
    end

    protected

    def run
      if @thread
        @thread.wakeup
        @thread.run
      else
        start
      end
    end

    def start
      @lock.synchronize do
        return if @thread
        @thread = Thread.new do
          loop do
            begin
              delay = get_delay
              if delay.nil?
                Thread.stop
                next
              end

              select(nil, nil, nil, delay / 1_000_000.to_f) if delay > 1 # 1 microsecond of cranularity

              while get_first_expired do
              end
            rescue => e
              puts e.inspect + "\n" + e.backtrace.join("\n")
            end
          end
        end
        @thread.abort_on_exception = true
      end
    end

    def get_delay
      return @mutex.synchronize { @slots.empty? ? nil : @slots.first.expires_at - utc_microseconds }
    end

    def get_first_expired
      @mutex.synchronize do
        slot = @slots.first
        if slot && (slot.expires_at < utc_microseconds)
          @slots.shift
          slot.started_at = utc_microseconds
          unless slot.canceled?
            execute(slot)
            if slot.recurrent?
              slot.reset!
              @slots << slot
            end
          end
        else
          slot = nil
        end

        slot
      end
    end

    def execute(slot)
      @callback.call(slot)
    end

    def utc_microseconds
      return Time.now.to_f * 1_000_000
    end
  end
end

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
ztimer-0.5.0	lib/ztimer/watcher.rb
ztimer-0.4.3	lib/ztimer/watcher.rb
ztimer-0.4.2	lib/ztimer/watcher.rb
ztimer-0.4.1	lib/ztimer/watcher.rb