.. index:: single: linda .. _linda/0:

.. rst-class:: right

object

linda

Linda tuple-space implementation for process communication. Provides a server that acts as a shared blackboard where clients can write (out/1-2), read (rd/1-2), and remove (in/1-2) tuples. Uses threaded engines for the server implementation and the sockets library for network communication.

| Availability: | logtalk_load(linda(loader))

| Author: Paulo Moura | Version: 2:0:0 | Date: 2026-03-27

| Compilation flags: | static, context_switching_calls, threaded

| Imports: | public :ref:`linda_server <linda_server/0>` | public :ref:`linda_client <linda_client/0>`

| Remarks:

• Supported backends: SWI-Prolog, Trealla Prolog, and XVM (requires both multi-threading and sockets support).
• Linda operations: The basic operations are out/1-2 (write tuple), in/1-2 (remove tuple, blocking), rd/1-2 (read tuple, blocking), in_noblock/1-2 (remove tuple, non-blocking), and rd_noblock/1-2 (read tuple, non-blocking).
• Tuple matching: Tuples are matched using unification.
• Blocking behavior: The in/1-2 and rd/1-2 predicates block until a matching tuple is available. The in_noblock/1-2 and rd_noblock/1-2 predicates fail immediately if no matching tuple is found.
• Multiple clients: Multiple clients can connect to the same server. A tuple removed by the in/1-2 or in_noblock/1-2 predicates is only removed for one client.
• Multiple servers: A client can connect to multiple servers. The first server it connects to, uses by default the blackboard alias.
• API compatibility: The API is inspired by the SICStus Prolog Linda library.
• Network communication: Uses TCP sockets for client-server communication, allowing processes to run on different machines.

| Inherited public predicates: |  :ref:`options_protocol/0::check_option/1`  :ref:`options_protocol/0::check_options/1`  :ref:`linda_client/0::close_client/1`  :ref:`options_protocol/0::default_option/1`  :ref:`options_protocol/0::default_options/1`  :ref:`linda_client/0::findall_in_noblock/3`  :ref:`linda_client/0::findall_in_noblock/4`  :ref:`linda_client/0::findall_rd_noblock/3`  :ref:`linda_client/0::findall_rd_noblock/4`  :ref:`linda_client/0::in/1`  :ref:`linda_client/0::in/2`  :ref:`linda_client/0::in_list/2`  :ref:`linda_client/0::in_list/3`  :ref:`linda_client/0::in_noblock/1`  :ref:`linda_client/0::in_noblock/2`  :ref:`linda_server/0::linda/0`  :ref:`linda_server/0::linda/1`  :ref:`linda_client/0::linda_client/1`  :ref:`linda_client/0::linda_client/2`  :ref:`linda_client/0::linda_timeout/2`  :ref:`options_protocol/0::option/2`  :ref:`options_protocol/0::option/3`  :ref:`linda_client/0::out/1`  :ref:`linda_client/0::out/2`  :ref:`linda_client/0::rd/1`  :ref:`linda_client/0::rd/2`  :ref:`linda_client/0::rd_list/2`  :ref:`linda_client/0::rd_list/3`  :ref:`linda_client/0::rd_noblock/1`  :ref:`linda_client/0::rd_noblock/2`  :ref:`linda_client/0::shutdown_server/1`  :ref:`options_protocol/0::valid_option/1`  :ref:`options_protocol/0::valid_options/1`  

.. contents:: :local: :backlinks: top

Public predicates

(no local declarations; see entity ancestors if any)

Protected predicates

(no local declarations; see entity ancestors if any)

Private predicates

(no local declarations; see entity ancestors if any)

Operators

(none)