laap

A Common Lisp multi-threaded event loop.

From micro-benchmarks run on a random laptop (i.e. ballpark numbers to give a rough idea), a small HTTP server could handle:

• laap: ~35k requests/sec
• cl-async: ~3k requests/sec
• Golang: ~125k requests/sec
• Aerys: ~30k requests/sec
• Node.js: ~3k requests/sec

Tested on linux/sbcl x86-64 only. (But definitely open to compatibility fixes.)

What motivated the creation of this library:

• Lack of filesystem I/O support on the cl-async library.
• Lack of native Common Lisp event loop library. (To the author's knowledge.)

Getting started

(laap:with-event-loop
  (let ((socket (make-instance 'laap/socket:ipv4-tcp-socket)))
	(laap/socket:connect socket
						 (lambda (err res)
						   (when err (error err))
						   (laap/socket:send socket
											 :data (babel:string-to-octets "foo")))
											 :ip "127.0.0.1"
											 :port 80)))

This snippet creates a TCP socket to 127.0.0.1:80 and send the string foo to it.

More examples in the t/ folder.

Features

Currently, laap supports:

• Sleeping
• Most operations for TCP IPv4 sockets.
• Most filesystem I/O operations.

laap plans on supporting the following features:

• All filesystem I/O operations.
• A built-in DNS resolver.
• Support for TCP IPv4 sockets options.
• Support for UDP/IPv6/Unix sockets.

API

The API is based on callbacks. All the callbacks must accept 2 arguments: an error (possibly nil) and a result (possibly nil too). This allows for easy wrapping around the callbacks.

Core

TODO.

Sockets

TODO.

Filesystem

TODO.

Internal

TODO.

License

This library is provided under the MIT license. See LICENSE.