To try to find the culprit in the Termite failings.

---

Since you got:

Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_INVALID_ADDRESS at address: 0x01c03ffc 0x003058c5 in ___H_base_2d_exception_2d_handler (___ps=0x4a1880) at _thread.c:27164 27164 ___JUMP_CONTINUATION_CAPTURE1(___JUMPNOTSAFE) (gdb) bt #0 0x003058c5 in ___H_base_2d_exception_2d_handler (___ps=0x4a1880) at _thread.c:27164 #1 0x0000906f in ___call (nargs=0, proc=3701041, stack_marker=7340973) at setup.c:1819 (gdb)

you can find out from _thread.c by scrolling up from line 27164 that it's the ___H__23__23_continuation_2d_capture_2d_aux procedure which is failing, which is the compiled version of ##continuation-capture-aux. Since it fails in an unsafe jump, I'd expect that it's been called with something different than a procedure (or maybe a procedure of a wrong argument count, not sure here). (Since it tries to access an address far off zero, I guess the given object is not an #f value or small fixnum but rather an allocated object of a wrong type.) This patch adds type checks, so instead of segfaulting you should now get an exception. (I realize that I'm not using ##not and ##pair? but it seems to work this way anyway. I'm hoping that the not interrupts-enabled isn't being disturbed by the potential error call though; and worse, *if* an exception happens, the code is interrupted for sure, but I don't see why it should be a problem here.)

I haven't tried your program as I don't have Termite installed in my current Gambit, and moreover, it wouldn't be your version of Termite anyway. (And I don't have time either..)

lib/_thread.scm | 41 +++++++++++++++++++++++------------------ 1 files changed, 23 insertions(+), 18 deletions(-)

diff --git a/lib/_thread.scm b/lib/_thread.scm index d228dde..2caa6be 100644 --- a/lib/_thread.scm +++ b/lib/_thread.scm @@ -2764,24 +2764,29 @@ (##continuation? obj))

(define-prim (##continuation-capture-aux receiver lift1 lift2 lift3 others) - (##declare (not interrupts-enabled)) - (cond ((##eq? lift1 (macro-absent-obj)) - (##continuation-capture receiver)) - ((##eq? lift2 (macro-absent-obj)) - (##continuation-capture receiver lift1)) - ((##eq? lift3 (macro-absent-obj)) - (##continuation-capture receiver lift1 lift2)) - ((##null? others) - (##continuation-capture receiver lift1 lift2 lift3)) - (else - (let ((lifts - (##cons lift1 - (##cons lift2 - (##cons lift3 - others))))) - (##continuation-capture - (lambda (cont) - (##apply receiver (##cons cont lifts)))))))) + (if (not (##procedure? receiver)) + (error "##continuation-capture-aux: got non-procedure receiver:" receiver)) + (let () + (##declare (not interrupts-enabled)) + (cond ((##eq? lift1 (macro-absent-obj)) + (##continuation-capture receiver)) + ((##eq? lift2 (macro-absent-obj)) + (##continuation-capture receiver lift1)) + ((##eq? lift3 (macro-absent-obj)) + (##continuation-capture receiver lift1 lift2)) + ((##null? others) + (##continuation-capture receiver lift1 lift2 lift3)) + (else + (if (not (pair? others)) + (error "##continuation-capture-aux: not a list:" others)) + (let ((lifts + (##cons lift1 + (##cons lift2 + (##cons lift3 + others))))) + (##continuation-capture + (lambda (cont) + (##apply receiver (##cons cont lifts)))))))))

(define-prim (##continuation-capture receiver