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Packs (add-ons) for SWI-Prolog

Package "spawn"

Title:Easy concurrency
Rating:Not rated. Create the first rating!
Latest version:0.0.1
SHA1 sum:ac15c286d83f0e6cf20a75e4443caa1127ec967c
Author:Michael Hendricks <michael@ndrix.org>
Maintainer:Michael Hendricks <michael@ndrix.org>
Packager:Michael Hendricks <michael@ndrix.org>
Home page:http://packs.ndrix.com/spawn/index.html
Download URL:http://packs.ndrix.com/spawn/spawn-0.0.1.tgz

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Details by download location

VersionSHA1#DownloadsURL
0.0.1ac15c286d83f0e6cf20a75e4443caa1127ec967c68http://packs.ndrix.com/spawn/spawn-0.0.1.tgz

Synopsis

:- use_module(library(spawn)).

retirement(EmployeeId,Name,HireDate) :-
    % start long-running computations in the background
    spawn(query_company_ldap(EmployeeId,Employee)),
    spawn(query_hr_database(EmployeeId,Job)),

    do_something_productive_while_waiting,

    % extract desired details from Employee and Job
    % (blocks until background computations are done)
    Employee = employee(Name,_,_),
    Job = job(_,HireDate,_).

some_numbers(PiN,Rand) :-
    % start long-running computations in the background
    async(calculate_nth_digit_of_pi(21_734,PiN),PiToken),
    async(ask_randomorg_for_a_number(Rand), RandToken),

    % explicitly block until they're done
    await(PiToken),
    writeln(PiN),   % now it has a value
    await(RandToken),
    writeln(Rand).  % now it has a value too

Description

SWI Prolog has great concurrency primitives. For some common operations, those primitives are too low level. You end up reading through a lot of message queue and threading boilerplate code. This library provides high level concurrency predicates which handle all the messy details.

Our aim is to make this library as easy to use as call/1.

Changes in this Version

  • First public release

Installation

Using SWI-Prolog 6.3 or later:

?- pack_install(spawn).

This module uses semantic versioning.

Source code available and pull requests accepted at http://github.com/mndrix/spawn

author
- Michael Hendricks <michael@ndrix.org>
license
- unlicense

Contents of pack "spawn"

Pack contains 6 files holding a total of 12.5K bytes.