If you find a good actors library, let me know. I've been using CL for 20 years and have not found a satisfying one.
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CL is in a slightly uncomfortable position here; scheme has first-class continuations, which makes implementing actors and async the sort of thing that could be an undergrad assignment, most other languages have a single source of truth (either with a language committee like C++ or with a one-true-implementation like Python).
[edit]
CL is in a slightly uncomfortable position here; scheme has first-class continuations, which makes implementing actors and async the sort of thing that could be an undergrad assignment, most other languages have a single source of truth (either with a language committee like C++ or with a one-true-implementation like Python).
cl-async is perfectly good for async.