class Channel(T)
Overview
A Channel
enables concurrent communication between fibers.
They allow communicating data between fibers without sharing memory and without having to worry about locks, semaphores or other special structures.
channel = Channel(Int32).new
spawn do
channel.send(0)
channel.send(1)
end
channel.receive # => 0
channel.receive # => 1
Defined in:
channel.crConstructors
Class Method Summary
- .receive_first(channels : Tuple | Array)
- .receive_first(*channels)
- .select(ops : Indexable(SelectAction), has_else = false)
- .select(*ops : SelectAction)
- .send_first(value, channels : Tuple | Array)
- .send_first(value, *channels)
Instance Method Summary
- #close
- #closed?
-
#inspect(io : IO) : Nil
Appends a String representation of this object which includes its class name, its object address and the values of all instance variables.
- #pretty_print(pp)
-
#receive
Receives a value from the channel.
-
#receive?
Receives a value from the channel.
- #receive_impl(&block)
- #receive_internal(&block)
- #send(value : T)
Instance methods inherited from class Reference
==(other : self)==(other : JSON::Any)
==(other : YAML::Any)
==(other) ==, dup dup, hash(hasher) hash, inspect(io : IO) : Nil inspect, object_id : UInt64 object_id, pretty_print(pp) : Nil pretty_print, same?(other : Reference)
same?(other : Nil) same?, to_s(io : IO) : Nil to_s
Constructor methods inherited from class Reference
new
new
Instance methods inherited from class Object
!=(other)
!=,
!~(other)
!~,
==(other)
==,
===(other : JSON::Any)===(other : YAML::Any)
===(other) ===, =~(other) =~, class class, dup dup, hash(hasher)
hash hash, inspect(io : IO) : Nil
inspect : String 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 : String
to_s(io : IO) : Nil to_s, to_yaml(io : IO)
to_yaml to_yaml, try(&block) try, unsafe_as(type : T.class) forall T unsafe_as
Constructor methods inherited from class Object
from_json(string_or_io, root : String) : selffrom_json(string_or_io) : self from_json, from_yaml(string_or_io : String | IO) : self from_yaml
Constructor Detail
Class Method Detail
Instance Method Detail
Appends a String representation of this object which includes its class name, its object address and the values of all instance variables.
class Person
def initialize(@name : String, @age : Int32)
end
end
Person.new("John", 32).inspect # => #<Person:0x10fd31f20 @name="John", @age=32>
Receives a value from the channel. If there is a value waiting, it is returned immediately. Otherwise, this method blocks until a value is sent to the channel.
Raises ClosedError
if the channel is closed or closes while waiting for receive.
channel = Channel(Int32).new
channel.send(1)
channel.receive # => 1
Receives a value from the channel. If there is a value waiting, it is returned immediately. Otherwise, this method blocks until a value is sent to the channel.
Returns nil
if the channel is closed or closes while waiting for receive.