Macro: SB-SYS:WITHOUT-INTERRUPTS

Executes BODY with all deferrable interrupts disabled. Deferrable interrupts arriving during execution of the BODY take effect after BODY has been executed.

Deferrable interrupts include most blockable POSIX signals, and SB-THREAD:INTERRUPT-THREAD. Does not interfere with garbage collection, and unlike in many traditional Lisps using userspace threads, in SBCL WITHOUT-INTERRUPTS does not inhibit scheduling of other threads.

Binds ALLOW-WITH-INTERRUPTS and WITH-LOCAL-INTERRUPTS as a local macros.

ALLOW-WITH-INTERRUPTS allows the WITH-INTERRUPTS to take effect during the dynamic scope of its body, unless there is an outer WITHOUT-INTERRUPTS without a corresponding ALLOW-WITH-INTERRUPTS.

WITH-LOCAL-INTERRUPTS executes its body with interrupts enabled provided that for there is an ALLOW-WITH-INTERRUPTS for every WITHOUT-INTERRUPTS surrounding the current one. WITH-LOCAL-INTERRUPTS is equivalent to:

(allow-with-interrupts (with-interrupts …))

Care must be taken not to let either ALLOW-WITH-INTERRUPTS or WITH-LOCAL-INTERRUPTS appear in a function that escapes from inside the WITHOUT-INTERRUPTS in:

(without-interrupts ;; The body of the lambda would be executed with WITH-INTERRUPTS allowed ;; regardless of the interrupt policy in effect when it is called. (lambda () (allow-with-interrupts …)))

(without-interrupts ;; The body of the lambda would be executed with interrupts enabled ;; regardless of the interrupt policy in effect when it is called. (lambda () (with-local-interrupts …)))

Lambda list

(&body sb-unix::body)