X-Git-Url: https://jxself.org/git/?a=blobdiff_plain;f=8sync%2Fsystems%2Factors.scm;h=84a5c2e3c178f168d39b981f90be4ff2b3b609f3;hb=refs%2Fheads%2Fremove-define-mhandler;hp=ea638c0e180eb5b290f88ef6bde90d36eae2669f;hpb=e268e79621f23cb7d3d9efc78093f0d85b356cdf;p=8sync.git

diff --git a/8sync/systems/actors.scm b/8sync/systems/actors.scm
index ea638c0..84a5c2e 100644
--- a/8sync/systems/actors.scm
+++ b/8sync/systems/actors.scm
@@ -70,7 +70,7 @@
 
             <- <-wait <-reply <-reply-wait
 
-            call-with-message msg-receive
+            call-with-message msg-receive msg-val
 
             ez-run-hive
             bootstrap-message
@@ -110,6 +110,11 @@
 ;;; ========
 
 
+;; @@: We may want to add a deferred-reply to the below, similar to
+;;   what we had in XUDD, for actors which do their own response
+;;   queueing.... ie, that might receive messages but need to shelve
+;;   them to be acted upon after something else is taken care of.
+
 (define-record-type <message>
   (make-message-intern id to from action
                        body in-reply-to wants-reply
@@ -617,11 +622,20 @@ argument.  Similar to call-with-values in concept."
 ;; Emacs: (put 'msg-receive 'scheme-indent-function 2)
 
 ;; @@: Or receive-msg or receieve-message or??
-(define-syntax-rule (msg-receive arglist the-message body ...)
-  (call-with-message the-message
+(define-syntax-rule (msg-receive arglist message body ...)
+  "Call body with arglist (which can accept arguments like lambda*)
+applied from the message-body of message."
+  (call-with-message message
                      (lambda* arglist
                        body ...)))
 
+(define (msg-val message)
+  "Retrieve the first value from the message-body of message.
+Like single value return from a procedure call.  Probably the most
+common case when waiting on a reply from some action invocation."
+  (call-with-message message
+                     (lambda (_ val) val)))
+
 
 ;;; Various API methods for actors to interact with the system
 ;;; ==========================================================