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 linda_server

public linda_client

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.