https://github.com/kiuma/thread-pool.git
git clone 'https://github.com/kiuma/thread-pool.git'
(ql:quickload :thread-pool)
PROBLEM========================================================================= Thread creation is an ‘heavy’ process. Too many thrads hurts performance.
SOLUTION======================================================================== thread-pool is a simple library that allows users for asynchronous computation using only a fixed number of threads optimizing overall performance.
SAMPLE USAGE===================================================================
CL-USER> (require :thread-pool)
CL-USER> (let ((out standard-output)) (defun make-lazy-fib (n) (labels ((fib (n) (if (> n 2) (+ (fib (- n 1)) (fib (- n 2))) 1))) (lambda () (format out “~%fib ~a = ~a~%” n (fib n))))))
CL-USER> (defvar pool (thread-pool:make-thread-pool 3)) POOL
CL-USER> (thread-pool:start-pool pool) (#<SB-THREAD:THREAD “Anonymous thread” RUNNING {1002B88871}> #<SB-THREAD:THREAD “Anonymous thread” RUNNING {1002B88A71}> #<SB-THREAD:THREAD “Anonymous thread” RUNNING {1002B88C71}>)
CL-USER> (let ((out standard-output)) (defun make-lazy-fib (n) (flet ((fib (n) (if (> n 2) (+ (fib (- n 1)) (fib (- n 2))) 1))) (lambda () (format out “~%fib ~a = ~a~%” n (fib n)))))) MAKE-LAZY-FIB CL-USER> (progn (thread-pool:add-to-pool pool (make-lazy-fib 15)) (thread-pool:add-to-pool pool (make-lazy-fib 20)) (thread-pool:add-to-pool pool (make-lazy-fib 5)) (thread-pool:add-to-pool pool (make-lazy-fib 17)) (thread-pool:add-to-pool pool (make-lazy-fib 10)) (thread-pool:add-to-pool pool (make-lazy-fib 6)))
(#<CLOSURE (LAMBDA #) {10058664E9}>) (#<CLOSURE (LAMBDA #) {10058664E9}> #<CLOSURE (LAMBDA #) {1005867419}>) (#<CLOSURE (LAMBDA #) {10058664E9}> #<CLOSURE (LAMBDA #) {1005867419}> #<CLOSURE (LAMBDA #) {10058709C9}>)
fib 15 = 610 (#<CLOSURE (LAMBDA #) {1005867419}> #<CLOSURE (LAMBDA #) {10058709C9}> #<CLOSURE (LAMBDA #) {1005872699}>) (#<CLOSURE (LAMBDA #) {10058709C9}> #<CLOSURE (LAMBDA #) {1005872699}> #<CLOSURE (LAMBDA #) {1005874369}>) (#<CLOSURE (LAMBDA #) {10058709C9}> #<CLOSURE (LAMBDA #) {1005872699}> #<CLOSURE (LAMBDA #) {1005874369}> #<CLOSURE (LAMBDA #) {1005876039}>)
fib 5 = 5
fib 20 = 6765
fib 17 = 1597
fib 10 = 55
fib 6 = 8 1