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AsyncEval

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Emacs lisp is not multi-threaded. async-eval.el explores possibilities to work around this. It allows forms to be evaluated in a different Emacs process. This means that the executed code cannot access the current environment, and the code’s side effects cannot be used directly. There is a small overhead from starting a new process.

Examples

  (async-eval
      (lambda (result) (message "async result: <%s>" result))
    (let ((sum 0)
          (i 10000000))
      (while (> i 0)
        (setq sum (+ sum i)
              i (1- i)))
      sum))

async-eval can take care of exporting function definitions to the new process:

  (defun fib (n)
    "Intentionally slow fibonacci numbers."
    (if (< n 2)
        n
      (+ (fib (1- n)) (fib (- n 2)))))
  (async-eval-with-export '(fib)
      (lambda (result) (message "async result: <%s>" result))
    (fib 30))

CategoryExtensions