From 0e8129f5e6e5fd1821337085ef0423ab1b5ffe35 Mon Sep 17 00:00:00 2001
From: Justin Ethier <justin.ethier@gmail.com>
Date: Wed, 16 Dec 2015 22:54:34 -0500
Subject: [PATCH] Added thread stubs

---
 scheme/base.sld | 36 ++++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/scheme/base.sld b/scheme/base.sld
index a86286f1..85c7857a 100644
--- a/scheme/base.sld
+++ b/scheme/base.sld
@@ -1,7 +1,12 @@
 (define-library (scheme base)
   (export
     ;; Thread functions. these are not standard, and may be relocated
+    thread?
     make-thread
+    thread-name
+    thread-specific
+    thread-specific-set!
+    ;thread-start!
     ;; END threads
     ; TODO: need filter for the next two. also, they really belong in SRFI-1, not here
     ;delete
@@ -99,11 +104,34 @@
   )
   (begin
     ;; Threading
+    (define (thread? obj) 
+      (and (vector? obj) 
+           (> (vector-length obj) 0) 
+           (equal? 'cyc-thread-obj (vector-ref obj 0))))
+
     (define (make-thread thunk . name)
-      (let ((name-str (if (pair? name)
-                          (car name)
-                          "")))
-        (list 'cyc-thread-obj thunk name-str)))
+;      (let ((name-str (if (pair? name)
+;                          (car name)
+;                          "")))
+        ;; Fields supported so far:
+        ;; - type marker (implementation-specific)
+        ;; - thunk
+        ;; - internal thread id (implementation-specific)
+        ;; - name
+        ;; - specific
+        (vector 'cyc-thread-obj thunk #f name #f))
+;        (vector 'cyc-thread-obj thunk #f 'name-str #f)))
+
+    (define (thread-name t) (vector-ref t 3))
+    (define (thread-specific t) (vector-ref t 4))
+    (define (thread-specific-set! t obj) (vector-set! t 4 obj))
+
+; TODO:
+; current-thread - not sure how to look this up yet... may need a global list of running threads
+;    (define (thread-start! t)
+;      (let* ((thunk (vector-ref t 1)) 
+;             (mutator-id (Cyc-thread-start! thunk)))
+;        (vector-set! t 2 mutator-id)))
 
     ;; Features implemented by this Scheme
     (define (features) '(cyclone r7rs exact-closed))