Class: Evt::Bundled

Inherits:
Object
  • Object
show all
Defined in:
lib/evt/backends/bundled.rb,
ext/evt/evt.c

Direct Known Subclasses

Epoll, Iocp, Kqueue, Select, Uring

Defined Under Namespace

Classes: Payload

Constant Summary collapse

MAXIMUM_TIMEOUT = 
5000
COLLECT_COUNTER_MAX = 
16384

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Bundled

Returns a new instance of Bundled.



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# File 'lib/evt/backends/bundled.rb', line 7

def initialize
  @readable = {}
  @writable = {}
  @waiting = {}
  @iovs = {}
  
  @lock = Mutex.new
  @blocking = 0
  @ready = []
  @collect_counter = 0

  init_selector
end

Instance Attribute Details

#readable ⇒ Object (readonly)

Returns the value of attribute readable.



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# File 'lib/evt/backends/bundled.rb', line 21

def readable
  @readable
end

#waiting ⇒ Object (readonly)

Returns the value of attribute waiting.



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# File 'lib/evt/backends/bundled.rb', line 23

def waiting
  @waiting
end

#writable ⇒ Object (readonly)

Returns the value of attribute writable.



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# File 'lib/evt/backends/bundled.rb', line 22

def writable
  @writable
end

Class Method Details

.epoll_backend ⇒ Object

.kqueue_backend ⇒ Object

.select_backend ⇒ Object

.uring_backend ⇒ Object

Instance Method Details

#block(blocker, timeout = nil) ⇒ Object

Block the calling fiber.



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# File 'lib/evt/backends/bundled.rb', line 120

def block(blocker, timeout = nil)
  if timeout
    @waiting[Fiber.current] = current_time + timeout
    begin
      Fiber.yield
    ensure
      @waiting.delete(Fiber.current)
    end
  else
    @blocking += 1
    begin
      Fiber.yield
    ensure
      @blocking -= 1
    end
  end
end

#close ⇒ Object

Invoked when the thread exits.



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# File 'lib/evt/backends/bundled.rb', line 149

def close
  self.run
end

#collect(force = false) ⇒ Object

Collect closed streams in readables and writables



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# File 'lib/evt/backends/bundled.rb', line 154

def collect(force=false)
  if @collect_counter < COLLECT_COUNTER_MAX and !force
    @collect_counter += 1
    return
  end

  @collect_counter = 0

  @readable.keys.each do |io|
    @readable.delete(io) if io.closed?
  end
  
  @writable.keys.each do |io|
    @writable.delete(io) if io.closed?
  end

  @iovs.keys.each do |io|
    @iovs.delete(io) if io.closed?
  end
end

#current_time ⇒ Object 



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# File 'lib/evt/backends/bundled.rb', line 88

def current_time
  Process.clock_gettime(Process::CLOCK_MONOTONIC)
end

#epoll_deregister ⇒ Object

#epoll_init_selector ⇒ Object

#epoll_register ⇒ Object

#epoll_wait ⇒ Object

#fiber(&block) ⇒ Object

Intercept the creation of a non-blocking fiber.



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# File 'lib/evt/backends/bundled.rb', line 177

def fiber(&block)
  fiber = Fiber.new(blocking: false, &block)
  fiber.resume
  fiber
end

#io_wait(io, events, duration) ⇒ Object

Wait for the given file descriptor to match the specified events within the specified timeout.



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# File 'lib/evt/backends/bundled.rb', line 98

def io_wait(io, events, duration)
  # TODO: IO::PRIORITY
  @readable[io] = Fiber.current unless (events & IO::READABLE).zero?
  @writable[io] = Fiber.current unless (events & IO::WRITABLE).zero?
  self.register(io, events)
  Fiber.yield
  self.deregister(io)
  true
end

#kernel_sleep(duration = nil) ⇒ Object

Sleep the current task for the specified duration, or forever if not specified.

Parameters:

  • duration (Numeric) (defaults to: nil) —

    The amount of time to sleep in seconds.



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# File 'lib/evt/backends/bundled.rb', line 111

def kernel_sleep(duration = nil)
  self.block(:sleep, duration)
  true
end

#kqueue_init_selector ⇒ Object

#kqueue_register ⇒ Object

#kqueue_wait ⇒ Object

#next_timeout ⇒ Object 



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# File 'lib/evt/backends/bundled.rb', line 25

def next_timeout
  _fiber, timeout = @waiting.min_by{ |key, value| value }

  if timeout
    offset = (timeout - current_time) * 1000 # Use mililisecond
    return 0 if offset < 0
    return offset if offset < MAXIMUM_TIMEOUT
  end

  MAXIMUM_TIMEOUT
end

#run ⇒ Object 



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# File 'lib/evt/backends/bundled.rb', line 37

def run
  while @readable.any? or @writable.any? or @waiting.any? or @iovs.any? or @blocking.positive?
    readable, writable, iovs = self.wait

    readable&.each do |io|
      fiber = @readable.delete(io)
      fiber&.resume
    end

    writable&.each do |io|
      fiber = @writable.delete(io)
      fiber&.resume
    end

    unless iovs.nil?
      iovs&.each do |v|
        io, ret = v
        fiber = @iovs.delete(io)
        fiber&.resume(ret)
      end
    end

    collect

    if @waiting.any?
      time = current_time
      waiting, @waiting = @waiting, {}

      waiting.each do |fiber, timeout|
        if timeout <= time
          fiber.resume if fiber.is_a? Fiber and fiber.alive?
        else
          @waiting[fiber] = timeout
        end
      end
    end

    if @ready.any?
      ready = nil

      @lock.synchronize do
        ready, @ready = @ready, []
      end

      ready.each do |fiber|
        fiber.resume if fiber.is_a? Fiber and fiber.alive?
      end
    end
  end
end

#select_wait ⇒ Object

#unblock(blocker, fiber) ⇒ Object

Unblock the specified fiber.



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# File 'lib/evt/backends/bundled.rb', line 142

def unblock(blocker, fiber)
  @lock.synchronize do
    @ready << fiber
  end
end

#uring_init_selector ⇒ Object

#uring_io_read ⇒ Object

#uring_io_write ⇒ Object

#uring_register ⇒ Object

#uring_wait ⇒ Object