package picos_aux

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Auxiliary libraries for Picos

Install

Dune Dependency

github.com Readme Changelog ISC License Edit opam file Versions (2)

Authors

V

Vesa Karvonen <vesa.a.j.k@gmail.com>

Maintainers

V

Vesa Karvonen <vesa.a.j.k@gmail.com>

Sources

picos-0.5.0.tbz

sha256=862d61383e2df93a876bedcffb1fd1ddc0f96c50b0e9c07943a2aee1f0e182be

sha512=87805379017ef4a7f2c11b954625a3757a0f1431bb9ba59132202de278b3e41adbe0cdc20e3ab23b7c9a8c5a15faeb7ec79348e7d80f2b14274b00df0893b8c0

doc/picos_aux.mpmcq/Picos_aux_mpmcq/index.html

Module `Picos_aux_mpmcq`Source

Lock-free multi-producer, multi-consumer queue.

🏎️ This data structure is optimized for use as a building block of the ready queue of a (mostly) fair (i.e. mostly FIFO) multi-threaded scheduler. For example, one could use a queue per thread, to reduce contention, and have threads attempt to pop fibers from the queues of other threads when their local queues are empty. It is also possible to use only a single shared queue, but that will result in very high contention as this queue is not relaxed.

API

Sourcetype !'a t

A multi-producer, multi-consumer queue.

Sourceval create : ?padded:bool -> unit -> 'a t

create () returns a new empty multi-producer, multi-consumer queue.

Sourceval push : 'a t -> 'a -> unit

push queue value adds the value to the tail of the queue.

Sourceval push_head : 'a t -> 'a -> unit

push_head queue value adds the value to the head of the queue.

Sourceexception Empty

Raised by pop_exn in case it finds the queue empty.

Sourceval pop_exn : 'a t -> 'a

pop_exn queue tries to remove the value at the head of the queue. Returns the removed value or raises Empty in case the queue was empty.

raises Empty
in case the queue was empty.

Sourceval length : 'a t -> int

length queue returns the length or the number of values in the queue.

Sourceval is_empty : 'a t -> bool

is_empty queue is equivalent to length queue = 0.

Examples

An example top-level session:

  # let q : int Picos_aux_mpmcq.t =
      Picos_aux_mpmcq.create ()
  val q : int Picos_aux_mpmcq.t = <abstr>

  # Picos_aux_mpmcq.push q 42
  - : unit = ()

  # Picos_aux_mpmcq.push_head q 76
  - : unit = ()

  # Picos_aux_mpmcq.length q
  - : int = 2

  # Picos_aux_mpmcq.push q 101
  - : unit = ()

  # Picos_aux_mpmcq.pop_exn q
  - : int = 76

  # Picos_aux_mpmcq.pop_exn q
  - : int = 42

  # Picos_aux_mpmcq.pop_exn q
  - : int = 101

  # Picos_aux_mpmcq.pop_exn q
  Exception: Picos_aux_mpmcq.Empty.

On This Page

API
Examples