Class: Origen::Generator::PatternSequencer

Inherits:
Object
  • Object
show all
Defined in:
lib/origen/generator/pattern_sequencer.rb

Overview

Provides APIs to enable applications to support concurrency

Class Method Summary collapse

Class Method Details

.active? ⇒ Boolean Also known as: open?, runnng?

Returns true if a pattern sequence is currently open/active

Returns:

  • (Boolean) 


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# File 'lib/origen/generator/pattern_sequencer.rb', line 64

def active?
  !!@active
end

.add_thread(str) ⇒ Object

Prepends the given string with “[<current thread ID>] ” unless it already contains it



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# File 'lib/origen/generator/pattern_sequencer.rb', line 76

def add_thread(str)
  if active? && thread
    id = "[#{thread.id}] "
    str.prepend(id) unless str =~ /#{id}/
  end
  str
end

.reserve(id) ⇒ Object

Once a lock is acquired on a serialize block with the given ID, it won’t be released to other parallel threads until the end of this block



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# File 'lib/origen/generator/pattern_sequencer.rb', line 41

def reserve(id)
  if active?
    if thread.reservations[id]
      thread.reservations[id][:count] += 1
    else
      thread.reservations[id] = { count: 1, semaphore: nil }
    end
    yield
    if thread.reservations[id][:count] == 1
      # May not be set if the application reserved the resource but never hit it
      if s = thread.reservations[id][:semaphore]
        s.release
      end
      thread.reservations[id] = nil
    else
      thread.reservations[id][:count] -= 1
    end
  else
    yield
  end
end

.serialize(id = nil) ⇒ Object 



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# File 'lib/origen/generator/pattern_sequencer.rb', line 7

def serialize(id = nil)
  if active?
    s = nil
    id ||= caller[0]
    @semaphores ||= {}
    @semaphores[id] ||= Concurrent::Semaphore.new(1)
    s = @semaphores[id]
    completed = false
    blocked = false
    until completed
      # If already acquired or available
      if (thread.reservations[id] && thread.reservations[id][:semaphore]) || s.try_acquire
        thread.record_active if blocked
        yield
        completed = true
      else
        thread.waiting_for_serialize(id, blocked)
        blocked = true
      end
    end
    # If the thread has reserved access to this serialized resource then don't release it now, but
    # store a reference to the semaphore and it will be released at the end of the reserve block
    if thread.reservations[id]
      thread.reservations[id][:semaphore] = s
    else
      s.release
    end
  else
    yield
  end
end

.thread ⇒ Object

Returns the PatternThread object for the current thread



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# File 'lib/origen/generator/pattern_sequencer.rb', line 71

def thread
  @thread.value
end