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Showing content from http://ruby-concurrency.github.io/concurrent-ruby/master/Concurrent/AtomicFixnum.html below:

Class: Concurrent::AtomicFixnum — Concurrent Ruby

Inherits:

AtomicFixnumImplementation

• Object
• Concurrent::AtomicFixnum

show all

Defined in:

lib/concurrent-ruby/concurrent/atomic/atomic_fixnum.rb

A numeric value that can be updated atomically. Reads and writes to an atomic fixnum and thread-safe and guaranteed to succeed. Reads and writes may block briefly but no explicit locking is required.

Each of the thread-safe variable classes is designed to solve a different problem. In general:

• Agent: Shared, mutable variable providing independent, uncoordinated, asynchronous change of individual values. Best used when the value will undergo frequent, complex updates. Suitable when the result of an update does not need to be known immediately.
• Atom: Shared, mutable variable providing independent, uncoordinated, synchronous change of individual values. Best used when the value will undergo frequent reads but only occasional, though complex, updates. Suitable when the result of an update must be known immediately.
• AtomicReference: A simple object reference that can be updated atomically. Updates are synchronous but fast. Best used when updates a simple set operations. Not suitable when updates are complex. AtomicBoolean and AtomicFixnum are similar but optimized for the given data type.
• Exchanger: Shared, stateless synchronization point. Used when two or more threads need to exchange data. The threads will pair then block on each other until the exchange is complete.
• MVar: Shared synchronization point. Used when one thread must give a value to another, which must take the value. The threads will block on each other until the exchange is complete.
• ThreadLocalVar: Shared, mutable, isolated variable which holds a different value for each thread which has access. Often used as an instance variable in objects which must maintain different state for different threads.
• TVar: Shared, mutable variables which provide coordinated, synchronous, change of many stated. Used when multiple value must change together, in an all-or-nothing transaction. Performance:

Testing with ruby 2.1.2
Testing with Concurrent::MutexAtomicFixnum...
  3.130000   0.000000   3.130000 (  3.136505)
Testing with Concurrent::CAtomicFixnum...
  0.790000   0.000000   0.790000 (  0.785550)

Testing with jruby 1.9.3
Testing with Concurrent::MutexAtomicFixnum...
  5.460000   2.460000   7.920000 (  3.715000)
Testing with Concurrent::JavaAtomicFixnum...
  4.520000   0.030000   4.550000 (  1.187000)

• #compare_and_set(expect, update) ⇒ Boolean

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

• #decrement(delta = 1) ⇒ Fixnum

  Decreases the current value by the given amount (defaults to 1).

• #increment(delta = 1) ⇒ Fixnum

  Increases the current value by the given amount (defaults to 1).

• #initialize(initial = 0) ⇒ undocumented constructor

  Creates a new AtomicFixnum with the given initial value.

• #to_s ⇒ String (also: #inspect)

  Short string representation.

• #update {|Object| ... } ⇒ Object

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

• #value ⇒ Fixnum

  Retrieves the current Fixnum value.

• #value=(value) ⇒ Fixnum

  Explicitly sets the value.

Creates a new AtomicFixnum with the given initial value.

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# File 'lib/concurrent-ruby/concurrent/atomic/atomic_fixnum.rb', line 136

class AtomicFixnum < AtomicFixnumImplementation
    def to_s
    format '%s value:%s>', super[0..-2], value
  end

  alias_method :inspect, :to_s
end

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

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# File 'lib/concurrent-ruby/concurrent/atomic/atomic_fixnum.rb', line 136

class AtomicFixnum < AtomicFixnumImplementation
    def to_s
    format '%s value:%s>', super[0..-2], value
  end

  alias_method :inspect, :to_s
end

Decreases the current value by the given amount (defaults to 1).

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# File 'lib/concurrent-ruby/concurrent/atomic/atomic_fixnum.rb', line 136

class AtomicFixnum < AtomicFixnumImplementation
    def to_s
    format '%s value:%s>', super[0..-2], value
  end

  alias_method :inspect, :to_s
end

Increases the current value by the given amount (defaults to 1).

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# File 'lib/concurrent-ruby/concurrent/atomic/atomic_fixnum.rb', line 136

class AtomicFixnum < AtomicFixnumImplementation
    def to_s
    format '%s value:%s>', super[0..-2], value
  end

  alias_method :inspect, :to_s
end

Returns Short string representation.

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# File 'lib/concurrent-ruby/concurrent/atomic/atomic_fixnum.rb', line 138

def to_s
  format '%s value:%s>', super[0..-2], value
end

Pass the current value to the given block, replacing it with the block's result. May retry if the value changes during the block's execution.

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# File 'lib/concurrent-ruby/concurrent/atomic/atomic_fixnum.rb', line 136

class AtomicFixnum < AtomicFixnumImplementation
    def to_s
    format '%s value:%s>', super[0..-2], value
  end

  alias_method :inspect, :to_s
end

Retrieves the current Fixnum value.

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# File 'lib/concurrent-ruby/concurrent/atomic/atomic_fixnum.rb', line 136

class AtomicFixnum < AtomicFixnumImplementation
    def to_s
    format '%s value:%s>', super[0..-2], value
  end

  alias_method :inspect, :to_s
end

Explicitly sets the value.

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# File 'lib/concurrent-ruby/concurrent/atomic/atomic_fixnum.rb', line 136

class AtomicFixnum < AtomicFixnumImplementation
    def to_s
    format '%s value:%s>', super[0..-2], value
  end

  alias_method :inspect, :to_s
end

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