rontolisp:mutex-release

(rontolisp:mutex-release mutex)

Releases one acquisition of mutex and returns it. Releasing a mutex the calling thread does not hold is an error on the interpreter and the JVM backend (and unnoticed on WASM, where the primitives are no-ops). Because the lock is reentrant, a thread that acquired it twice must release it twice before another thread can take it.

rontolisp:with-mutex pairs the acquire and the release for you, including on a non-local exit; reach for the bare primitives only when the two cannot sit in one lexical block.

Limitations

• A value that is not a mutex handle is an error.
• On the WASM backends nothing is checked: releasing an unheld lock is silently accepted.