Macro: SB-EXT:WITH-TIMEOUT

Execute the body, asynchronously interrupting it and signalling a TIMEOUT condition after at least EXPIRES seconds have passed.

Note that it is never safe to unwind from an asynchronous condition. Consider:

(defun call-with-foo (function) (let (foo) (unwind-protect (progn (setf foo (get-foo)) (funcall function foo)) (when foo (release-foo foo)))))

If TIMEOUT occurs after GET-FOO has executed, but before the assignment, then RELEASE-FOO will be missed. While individual sites like this can be made proof against asynchronous unwinds, this doesn’t solve the fundamental issue, as all the frames potentially unwound through need to be proofed, which includes both system and application code – and in essence proofing everything will make the system uninterruptible.

Lambda list

(sb-impl::expires &body sb-impl::body)