struct Atomic(T)

Overview

A value that may be updated atomically.

Only primitive integer types, reference types or nilable reference types can be used with an Atomic type.

Defined in:

atomic.cr

Class Method Summary

Instance Method Summary

Instance methods inherited from struct Struct

==(other : self) : Bool ==, hash : Int32 hash, inspect(io : IO) : Nil inspect, pretty_print(pp) : Nil pretty_print, to_s(io) to_s

Instance methods inherited from struct Value

==(other) ==, dup dup

Instance methods inherited from class Object

!=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
===(other) ===, =~(other) =~, class class, dup dup, hash hash, inspect(io : IO)
inspect inspect, itself itself, not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, tap(&block) tap, to_json(io : IO)
to_json to_json, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ") to_pretty_json, to_s
to_s(io : IO) to_s, to_yaml(io : IO)
to_yaml to_yaml, try(&block) try

Class methods inherited from class Object

from_json(string_or_io, root : String) : self
from_json(string_or_io) : self from_json, from_yaml(string_or_io) : self from_yaml

Class Method Detail

def self.new(value : T) #

Creates an Atomic with the given initial value.


[View source]

Instance Method Detail

def add(value : T) #

Performs atomic_value += value. Returns the old value.

atomic = Atomic.new(1)
atomic.add(2) # => 1
atomic.get    # => 3

[View source]
def and(value : T) #

Performs atomic_value &= value. Returns the old value.

atomic = Atomic.new(5)
atomic.and(3) # => 5
atomic.get    # => 1

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def compare_and_set(cmp : T, new : T) : Tuple(T, Bool) #

Compares this atomic's value with cmp:

  • if they are equal, sets the value to new, and returns {old_value, true}
  • if they are not equal the value remains the same, and returns {old_value, false}
atomic = Atomic.new(1)

atomic.compare_and_set(2, 3) # => {1, false}
atomic.get                   # => 1

atomic.compare_and_set(1, 3) # => {1, true}
atomic.get                   # => 3

[View source]
def get #

Atomically returns this atomic's value.


[View source]
def lazy_get #

*Non-atomically returns this atomic's value.


[View source]
def lazy_set(value : T) #

Non-atomically sets this atomic's value to value. Returns the new value.

atomic = Atomic.new(5)
atomic.lazy_set(10) # => 10
atomic.get          # => 10

[View source]
def max(value : T) #

Performs atomic_value = max(atomic_value, value). Returns the old value.

atomic = Atomic.new(5)

atomic.max(3) # => 5
atomic.get    # => 5

atomic.max(10) # => 5
atomic.get     # => 10

[View source]
def min(value : T) #

Performs atomic_value = min(atomic_value, value). Returns the old value.

atomic = Atomic.new(5)

atomic.min(10) # => 5
atomic.get     # => 5

atomic.min(3) # => 5
atomic.get    # => 3

[View source]
def nand(value : T) #

Performs atomic_value = ~(atomic_value & value). Returns the old value.

atomic = Atomic.new(5)
atomic.nand(3) # => 5
atomic.get     # => -2

[View source]
def or(value : T) #

Performs atomic_value |= value. Returns the old value.

atomic = Atomic.new(5)
atomic.or(2) # => 5
atomic.get   # => 7

[View source]
def set(value : T) #

Atomically sets this atomic's value to value. Returns the new value.

atomic = Atomic.new(5)
atomic.set(10) # => 10
atomic.get     # => 10

[View source]
def sub(value : T) #

Performs atomic_value -= value. Returns the old value.

atomic = Atomic.new(9)
atomic.sub(2) # => 9
atomic.get    # => 7

[View source]
def swap(value : T) #

Atomically sets this atomic's value to value. Returns the old value.

atomic = Atomic.new(5)
atomic.swap(10) # => 5
atomic.get      # => 10

[View source]
def xor(value : T) #

Performs atomic_value ^= value. Returns the old value.

atomic = Atomic.new(5)
atomic.xor(3) # => 5
atomic.get    # => 6

[View source]