From 952f875c33707e4e8891db4dcccbb6e791ec29d3 Mon Sep 17 00:00:00 2001
From: Justin Ethier <justin.ethier@gmail.com>
Date: Mon, 4 Jan 2016 21:51:37 -0500
Subject: [PATCH] Initial file

---
 test2.scm | 133 ++++++++++++++++++++----------------------------------
 1 file changed, 50 insertions(+), 83 deletions(-)

diff --git a/test2.scm b/test2.scm
index 53288a0c..436f0158 100644
--- a/test2.scm
+++ b/test2.scm
@@ -1,88 +1,55 @@
-;(import (scheme eval) (scheme write))
-;
-;(eval '((lambda (expr rename compare) (cond ((null? (cdr expr)) #t) ((null? (cddr expr)) (cadr expr)) (else (list (rename (quote if)) (cadr expr) (cons (rename (quote and)) (cddr expr)) #f)))) '(test 1 2 3) (lambda (x) x) '()))
-;;;(eval '((lambda (x) x) 1))
-;
-;
 (import (scheme base)
-        ;(test-lib test)
-        (scheme eval)
-        (scheme write))
+        (scheme read)
+        (scheme write)
+        (srfi 18))
 
-(define-syntax swap!
-  (er-macro-transformer
-    (lambda (form rename compare?)
-      (let (
-        (x (cadr form))
-        (y (caddr form))
-        (%tmp (rename 'tmp))
-        (%let (rename 'let))
-        (%set! (rename 'set!))
-        )
-        `(,%let ((,%tmp ,x))
-           (,%set! ,x ,y)
-           (,%set! ,y ,%tmp))))))
+(define lock (make-mutex))
+(mutex-lock! lock)
+(mutex-unlock! lock)
 
-(define x 'x)
-(define y 'y)
-(write `(,x ,y))
-(swap! x y)
-(write `(,x ,y))
+;; A program to prove if cooperation is working, or if it
+;; is blocked by another thread. The (read) causes the main
+;; thread to block. The collector should be notified prior 
+;; to the blocking call being made, and the collector should
+;; be able to cooperate on the main thread's behalf:
+(define tmp '())
+(thread-start! 
+  (make-thread 
+    (lambda () 
+      (write 'start-mem-producer-thread)
+      (letrec ((loop (lambda ()
+                      (set! tmp (cons "cons" tmp))
+                      ;(write tmp)
+                      (cond
+                       ((> (length tmp) 1000)
+                        ;(write "resetting tmp")
+                        (set! tmp '()))
+                       (else #f))
+                      (loop))))
+      (loop))
+    )))
+
+(thread-start! 
+  (make-thread 
+    (lambda () 
+      (write 'start-mutex-thread)
+      (letrec ((loop (lambda ()
+                      (let ((rv (mutex-lock! lock)))
+                        (write (list 'mutex-result rv))
+                        (mutex-unlock! lock))
+                      ;(loop)
+                      )))
+      (loop))
+    )))
+
+; main thread loop
+(letrec ((loop (lambda ()
+                (mutex-lock! lock)
+                (let ((rv (read)))
+                  (write `(read ,rv)))
+                (mutex-unlock! lock)
+                (thread-sleep! 1000)
+                (loop))))
+(loop))
 
-(define tmp 'tmp)
-(define y 'y)
-(write `(,tmp ,y))
-(swap! tmp y)
-(write `(,tmp ,y))
 
-;(define-syntax test
-;  (er-macro-transformer
-;    (lambda (expr rename compare)
-;      `((lambda ()
-;        (write "testing")
-;        (write (quote ,(cdr expr))))))))
-;
-; WTF is the macro unable to be evaluated when the same code works as part of *defined-macros*???
-;
-;(define-syntax test 
-;  (er-macro-transformer
-;     (lambda (expr rename compare)
-;       (cond ((null? (cdr expr)) #t)
-;;       (cond ((null? (cdr expr)))
-;             ((null? (cddr expr)) (cadr expr))
-;             (else (list (rename 'if) (cadr expr)
-;                         (cons (rename 'and) (cddr expr))
-;                         #f))))))
-;
-;(define-syntax test2
-;  (er-macro-transformer
-;     (lambda (expr rename compare)
-;       ;; need some way to get these in the eval env
-;       ;;
-;       ;; may need to maintain an environment in the compiler and pass it
-;       ;; along to eval somehow when macro is expanded. would this just
-;       ;; involve changes to expand? also, does that mean macro:expand
-;       ;; should call eval directly if a non-compiled macro is found?
-;       ;; if that is the case, macro:expand would also need to receive
-;       ;; the env parameter so it could pass that along to.
-;       ;; tbd how this parameter would be combined with eval's global env,
-;       ;; because it would need to extend it.
-;       ;; could eval expose a function to extend the global env (or any env)?
-;       (test 1 2 3)
-;       (test 1 2 3) ; breaks
-;       (my-or 1 2 3) ; breaks
-;       (and ''test ''test2))))
-;
-;(write (test2 1 2 3))
-;(write (test 1 2 3))
-;(write (my-or 1 2 3 'or))
-;(write (my-or #f 2 3 'or))
-;;(test 'done)
-;'done
-;
-;(define x 1)
-;(write x)
-;(write
-;  (eval 'my-or))
-;(write
-;  (eval '(my-or x 1 2 x)))