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Not OP, and not familiar with Ada - but this might go into the limitations of Ada's concurrency model:

Rendezvous Facilities: Concurrent C and the Ada Language - https://www.computer.org/csdl/journal/ts/1988/11/e1546/13rRU...

> The concurrent programming facilities in both Concurrent C and the Ada language are based on the rendezvous concept. Although these facilities are similar, there are substantial differences.

> Facilities in Concurrent C were designed keeping in perspective the concurrent programming facilities in the Ada language and their limitations. Concurrent C facilities have also been modified as a result of experience with its initial implementations.

> The authors compare the concurrent programming facilities in Concurrent C and Ada and show that it is easier to write a variety of concurrent programs in Concurrent C than in Ada.




A lot changes in Ada-95; the Ada-83 concurrency model was indeed very limited (which is what that article talked about).




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