123456789_123456789_123456789_123456789_123456789_

Class: Concurrent::ThreadSafe::Util::Striped64::Cell

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, AtomicReference
Instance Chain:
self, AtomicReference
Inherits: Concurrent::AtomicReference
Defined in: lib/concurrent-ruby/concurrent/thread_safe/util/striped64.rb

Overview

Padded variant of AtomicLong supporting only raw accesses plus CAS. The value field is placed between pads, hoping that the JVM doesn’t reorder them.

Optimisation note: It would be possible to use a release-only form of CAS here, if it were provided.

Class Method Summary

AtomicReference - Inherited

.new

Instance Method Summary

AtomicReference - Inherited

#compare_and_set

Atomically sets the value to the given updated value if the current value == the expected value.
#get

Gets the current value.
#get_and_set

Atomically sets to the given value and returns the old value.
#inspect

Alias for AtomicReference#to_s.
#set

Sets to the given value.
#to_s,
#try_update

Pass the current value to the given block, replacing it with the block’s result.
#try_update!

Pass the current value to the given block, replacing it with the block’s result.
#update

Pass the current value to the given block, replacing it with the block’s result.

Constructor Details

This class inherits a constructor from Concurrent::AtomicReference

Class Method Details

.padding (private)

[ GitHub ] 

  


# File 'lib/concurrent-ruby/concurrent/thread_safe/util/striped64.rb', line 96



def self.padding
  # TODO: this only adds padding after the :value slot, need to find a way to add padding before the slot
  # TODO (pitr-ch 28-Jul-2018): the padding instance vars may not be created
  # hide from yardoc in a method
  attr_reader :padding_0, :padding_1, :padding_2, :padding_3, :padding_4, :padding_5, :padding_6, :padding_7, :padding_8, :padding_9, :padding_10, :padding_11
end


  







Instance Method Details



  

    #cas(old_value, new_value)  
  



  

    

Alias for AtomicReference#compare_and_set.


  



  [ GitHub ]


  

  


# File 'lib/concurrent-ruby/concurrent/thread_safe/util/striped64.rb', line 89



alias_method :cas, :compare_and_set


  








  

    #cas_computed  
  

  [ GitHub ]


  

  


# File 'lib/concurrent-ruby/concurrent/thread_safe/util/striped64.rb', line 91



def cas_computed
  cas(current_value = value, yield(current_value))
end