[ANN] Dezyne 2.15.1 released

[Jan Nieuwenhuizen]

We are proud and relieved to announce Dezyne 2.15.1 which completes full
support for blocking: This finally marks the Grand Unification into
single threaded execution semantics.

The documentation is available here:
<https://dezyne.org/documentation.html>.

We will evaluate your reports and track them via the
[[https://gitlab.com/groups/dezyne/-/issues][Gitlab dezyne-issues
project]], see our [[https://dezyne.org/bugreport][guide to writing
helpful bug reports]].

What's next?

Verification with system scope and automatically exploring possible
traces in a system.  Introducing a new keyword `defer' for asynchronous
behavior and deprecation of `async'.

Future

Looking beyond the next releases we will introduce implicit interface
constraints.  Hierarchical behaviors, module-specifications and
data-interfaces.  Support for Model Based Testing.

Enjoy!
The Dezyne developers.

Here are the compressed sources and a GPG detached signature[*]:
  https://dezyne.org/download/dezyne/dezyne-2.15.1.tar.gz
  https://dezyne.org/download/dezyne/dezyne-2.15.1.tar.gz.sig

Here are the SHA1 and SHA256 checksums:

bf946bd8b13e55b055f67339c33796b86f10f4a1  dezyne-2.15.1.tar.gz
c657900fcc5a081b9aa8219a983f4b486d2830b8ff009fdd6190dcdd93122d7a  
dezyne-2.15.1.tar.gz

[*] Use a .sig file to verify that the corresponding file (without the
.sig suffix) is intact.  First, be sure to download both the .sig file
and the corresponding tarball.  Then, run a command like this:

  gpg --verify .sig

If that command fails because you don't have the required public key,
then run this command to import it:

  gpg --keyserver keys.gnupg.net --recv-keys 
1A858392E331EAFDB8C27FFBF3C1A0D9C1D65273

and rerun the 'gpg --verify' command.

NEWS

* Changes in 2.15.1 since 2.15.0
** Build
  - Tests that produce unstable witnesses have been disabled so that the
    test-suite now passes with different builds of mCRL2 that, in case
    of multiple counter examples, leads to reporting one of them
    (pseudo) randomly.
** Noteworthy bug fixes
  - Verification no longer erroneously reports a deadlock when using
    blocking in a synchronous context.
  - The simulator no longer prints the initiating port event arrow twice
    which would lead to an invalid split-arrows trace for certain
    compliance errors.
  - The simulator now synthesizes the missing port action in case of a
    compliance error, to produce a complete split-arrows trace.
  - The simulator now reports a second reply error at the return of a
    void event if a reply was already set.
  - The simulator now reports a deadlock when using a void reply in a
    non-blocking synchronous context.
  - The simulator no longer reports a deadlock when using a skip-block
    reply in a function.
  - The simulator now correctly postpones flushing in system context
    when using multiple out events on a single modeling event until all
    events are enqueued.

* Changes in 2.15.0 since 2.14.0
** Language
  - Blocking is now fully supported, it may be used:
    + In non-toplevel components,
    + In a component with multiple provides ports, but see the
      `Blocking' section in the manual for caveats.
    + A new `blocking' qualifier for ports must be used if a port can
      block, or block collateraly.
  - Using unobservable non-determinism in interfaces is no longer
    supported.
  - An action or function call can now also be used in a return
    expression ([[https://gitlab.com/dezyne/dezyne-issues/-/issues/67][#67]]).  
Note that recursive functions still cannot be
    valued.
** Commands
  - The `dzn explore' command has been removed.
** Verification
  - The verifier now supports blocking for components with multiple
    provides ports.
  - The verifier now detects possible deadlock errors due to a requires
    action blocking collaterally, which could happen when a component
    deeper in the system hierarchy uses blocking.
  - The option `--no-interface-determinism' has been removed for `dzn
    verify'.
** Simulation
  - The simulator now supports collateral blocking.
  - In interactive mode:
    + The new ,state command show the state 
([[https://gitlab.com/dezyne/dezyne-issues/-/issues/66][#66]]),
    + The new ,quit command exits the session,
    + The simulator does not exit when supplying empty input.
  - The simulator now detects possible deadlock errors due to a requires
    action blocking collaterally, which could happen when a component
    deeper in the system hierarchy uses blocking.
  - The simulator now detects livelocks in interfaces at end of trail.
  - The simulator now detects queue-full errors caused by external at
    end of trail.
  - The `dzn simulate' command now supports the `-C,--no-compliance',
    `--no-interface-livelock' and `-Q,--no-queue-full' options,
** Code
  - The C++ and C# code generators and runtime now fully support
    collaterally blocking components.
** Views
  - Returns are no longer removed from the state-diagram.  Using the new
    `--hide=returns' (or `--hide=actions') now removes void action
    returns.
** Documentation
  - Blocking has been updated and extended.
  - A new section on foreign components was added.
** Noteworthy bug fixes
  - Using the construct `provides external' (which has no semantics) no
    longer confuses the simulator.
  - A bug has been fixed that would cause the well-welformness check for
    system bindings to ignore certain missing bindings.
  - A bug has been fixed when assigning a value to a formal parameter of
    a function.
  - A bug has been fixed in the vm that would cause graph or simulate to
    hang when using a foreign component that has both provides and
    requires ports (note: don't do that!).
  - The test framework can be built using gcc-11.
  - A bug has been fixed in the code generator when assiging to a local
    variable that shadows a formal parameter or member variable.
  - A bug has been fixed in the verifier when creating a new local
    variable or assigning a variable that remains otherwise unused.
  - The simulation function now supports injection of foreign
    components.
  - The trace produced by running dezyne code is now correct when using
    injected foreign components.
  - A bug has been fixed that would cause the verifier to overlook
    non-determinism in a component.
  - Using external data in binary expressions is now reported as an
    error ([[https://gitlab.com/dezyne/dezyne-issues/-/issues/64][#64]]).
  - The parser no longer reports "<unknown-type>" expected when an
    external type definition is missing.
  - The well-formedness check of the parser no longer hangs when a
    component has the same name as one of its interfaces.
  - An interface can now have the same name as its namespace.

-- 
Jan Nieuwenhuizen <janneke@gnu.org>  | GNU LilyPond https://lilypond.org
Freelance IT https://JoyOfSource.com | Avatar® https://AvatarAcademy.com

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