cyclone/examples/call-scm-from-c/basic-no-gc.scm
2020-08-11 19:02:05 -04:00

37 lines
917 B
Scheme

(import (scheme base)
(scheme write)
(srfi 18))
(include-c-header "basic.h")
(define lock (make-mutex))
(define *done* #f)
(define *dummy signal-done) ;; Hack to prevent optimizing out signal-done
(define-c start-c-thread
"(void *data, int argc, closure _, object k)"
"start_c_thread(data);
return_closcall1(data, k, boolean_t); ")
;; Signal (wait) that it is done, this is called from C
(define (signal-done obj)
(write `(Called from C set *done* to ,obj))
(newline)
(mutex-lock! lock)
(set! *done* obj)
(mutex-unlock! lock)
#u8(1 2 3))
;; More efficient to use a condition var here to signal ready,
;; but this is just an example
(define (wait)
(thread-sleep! 1)
(mutex-lock! lock)
(define done *done*)
(mutex-unlock! lock)
(if done
#t
(wait)))
(start-c-thread) ;; Spawn a separate C thread since main thread runs Scheme
(wait) ;; Wait for the signal