* What is it
async.el is an exceedingly simple (78 lines of code) module for doing
asynchronous processing in Emacs, by spawning a child Emacs interpreter to
execute a lambda function, and calling back when the job is done.
It uses a very simple syntax:
(async-start
;; What to do in the child process
(lambda ()
(message "This is a test")
(sleep-for 3)
222)
;; What to do when it finishes
(lambda (result)
(message "Async process done, result should be 222: %s" result)))
If you omit the callback function, `async-start` returns a process object that
you can call `async-get` on when you're ready to wait for the result value:
(let ((proc (async-start
;; What to do in the child process
(lambda ()
(message "This is a test")
(sleep-for 3)
222))))
(message "I'm going to do some work here") ;; ....
(message "Waiting on async process, result should be 222: %s"
(async-get proc)))
If you don't want to use a callback, and you don't care about any return value
form the child process, pass the `ignore` symbol as the second argument (if
you don't, and never call `async-get', it will leave *emacs* process buffers
hanging around):
(async-start
(lambda ()
(delete-file "a remote file on a slow link" nil))
'ignore)
* Where to get it
The latest version can be found here: https://github.com/jwiegley/emacs-async
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