The Ada Rapporteur Group (ARG) of Working Group 9 (ISO WG9), within ISO/IEC JTC1 SC22, is responsible for maintaining and advancing the International Ada Programming Language Standard. In the past we have used an “ada-comment” mailing list as the official place to file comments or suggestions about the Standard. Over the past six months we have been moving to an online approach using a website and a GitHub issue repository. The new process seems to be working, so we ask all those with comments about the Ada Standard or the Ada Reference Manual to visit the new ARG website:

arg.adaic.org

and select the “Community Input” page. There you will find forms for filing comments, or for requesting the formation of a “language study group” to focus on particular thorny topics associated with the language (an example might be “distributed computing” or “tree pattern matching”).

Rather than filling out a form, you can head over to the ARG GitHub repository:

github.com/Ada-Rapporteur-Group/User-Community-Input

and select the GitHub “issue” tab to post your comments, or join a discussion on issues already there.

We would also welcome “meta” comments if you have thoughts on how to improve the ARG process itself.

Thanks!
-Tucker Taft on behalf of the Ada Rapporteur Group

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A full implementation of the parallel features of Ada 2022 is yet to be released. In the meantime, here is a light-weight-threading library that provides essentially all of the parallel features of Ada 2022, using various generics, etc. Scheduling is provided using a plug-in architecture. If no scheduler is plugged in, the light-weight threads are simply executed sequentially. If a light-weight-thread scheduler is plugged in, then the light-weight threads spawned by instances of the various generic packages are managed by that scheduler.

There are currently two LWT scheduler plug-ins:

• a wrapper for the GNU implementation of OpenMP (lwt-openmp.ads)
• a work-stealing based plug-in, written entirely in Ada (lwt-work_stealing.ads)

Below is a link to the “readme.md” documentation for the GitHub lwt library. It is currently part of the ParaSail GitHub repository, but the files in “lwt” are actually independent of ParaSail. ParaSail has its own work-stealing-based scheduler built-in, but at some point we plan to shift over to using the “lwt” library. But at the moment, there is no dependence either way between the ParaSail interpreter/compiler and the lwt library.

Feel free to open GitHub Issues if you find problems with the implementation, or have suggestions for improvements.

Enjoy!

-Tucker Taft

The ParaSail GitHub repository was created by my colleague Olivier Henley, and he has also helped to improve the documentation and testing scripts. Much appreciated!

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