From 22a23a79d9325f8f7ba963fae706bca46de2a491 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Sun, 6 Oct 2013 08:17:04 -0400
Subject: Move wait procedure into agenda module.

---
 2d/agenda.scm | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to '2d/agenda.scm')

diff --git a/2d/agenda.scm b/2d/agenda.scm
index 77983b2..c336ff1 100644
--- a/2d/agenda.scm
+++ b/2d/agenda.scm
@@ -25,12 +25,14 @@
   #:use-module (ice-9 q)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-9)
+  #:use-module (2d coroutine)
   #:export (make-agenda
             with-agenda
             agenda-schedule
             agenda-schedule-interval
             update-agenda
-            clear-agenda))
+            clear-agenda
+            wait))
 
 ;; This code is a modified version of the agenda implementation in
 ;; SICP. Thank you, SICP!
@@ -192,3 +194,8 @@ upon every update."
 (define (clear-agenda)
   "Clear the current agenda."
   (%clear-agenda *current-agenda*))
+
+(define* (wait #:optional (delay 1))
+  "Yield coroutine and schdule the continuation to be run after DELAY
+ticks."
+  (yield (lambda (resume) (agenda-schedule resume delay))))
-- 
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