mq: New module, replacing message-io.

The old module was rather inconvenient in usage.
Some TODOs: message cancellation, message handlers,
closing queues, error handling, fixing a guile-fibers
bug ...

* gnu/gnunet/mq.scm: New module.
* gnu/gnunet/mq/envelope.scm: Export bind-atomic-boxen
  for (gnu gnunet mq), pending a move into a separate module.
* tests/mq.scm: Test the new module.
  The first test is based on a test from upstream.

1 files changed, 3 insertions, 1 deletions

diff --git a/gnu/gnunet/mq/envelope.scm b/gnu/gnunet/mq/envelope.scm
index e0c94a2..76d91ea 100644
--- a/gnu/gnunet/mq/envelope.scm
+++ b/gnu/gnunet/mq/envelope.scm
@@ -26,7 +26,9 @@
 ;; so no type checks there.
 (define-library (gnu gnunet mq envelope)
   (export <envelope> make-envelope envelope?
-          attempt-cancel! attempt-irrevocable-sent!)
+          attempt-cancel! attempt-irrevocable-sent!
+          ;; TODO find a better place
+          (rename (bind-atomic-boxen %%bind-atomic-boxen)))
   (import (gnu gnunet utils hat-let)
           (only (guile) define* lambda* exact-integer?)
           (only (ice-9 match) match)