From: Christopher Allan Webber <cwebber@dustycloud.org>
Date: Mon, 25 Apr 2016 17:51:09 +0000 (-0500)
Subject: actors: Fix resuming continuation when waiting on message.
X-Git-Tag: v0.2.0~44
X-Git-Url: https://jxself.org/git/?p=8sync.git;a=commitdiff_plain;h=148aae4afbbbfa1a0845746294acb1385deda9b6

actors: Fix resuming continuation when waiting on message.

Pattern matching was wrong.  Also added an error check.

* 8sync/systems/actors.scm (hive-process-message): Fix pattern match.
  Add error check that we're resuming to the correct actor.
---

diff --git a/8sync/systems/actors.scm b/8sync/systems/actors.scm
index ce55597..f9b9047 100644
--- a/8sync/systems/actors.scm
+++ b/8sync/systems/actors.scm
@@ -464,7 +464,14 @@ more compact following syntax:
   (define (resume-waiting-coroutine)
     (match (hash-remove! (hive-waiting-coroutines hive)
                          (message-in-reply-to message))
-      ((_ . kont)
+      ((_ . (resume-actor-id . kont))
+       (if (not (equal? (message-to message)
+                        resume-actor-id))
+           (throw 'resuming-to-wrong-actor
+                  "Attempted to resume a coroutine to the wrong actor!"
+                  #:expected-actor-id (message-to message)
+                  #:got-actor-id resume-actor-id
+                  #:message message))
        (kont message))
       (#f (throw 'no-waiting-coroutine
                  "message in-reply-to tries to resume nonexistent coroutine"