Valgrind reports Gambit is leaking a "sfun stack marker" if I call, from a foreign release function, another function defined with `c-define`. The code below is about the most innocent looking thing I could come up with.
Doesn't Gambit like c-define functions called within release functions, or is Valgrind giving me a false positive here (as it is wont to do quite often.)
; ~/gambit-dbg/bin/gsc -exe -cc-options -g test-c-define.scm && valgrind --leak-check=full ./test-c-define
(c-declare #<<c-declare-end
typedef struct { int x; int y; } point;
void scm_release_point(unsigned long);
___SCMOBJ c_release_point(void *ptr) { scm_release_point((unsigned long)ptr); ___EXT(___release_rc)(ptr); return ___FIX(___NO_ERR); }
c-declare-end )
(c-define (release-point ptr) (unsigned-long) void "scm_release_point" "" (println "release-point called"))
(c-define-type point (pointer "point" (point*) "c_release_point"))
(define p ((c-lambda () point "___result_voidstar = ___EXT(___alloc_rc)(sizeof(point));")))
(println "p is " p) (set! p #f)
(##gc) ; for good measure... (##gc) (##gc)
(println "Bye.")
valgrind --leak-check=full ./test-c-define ==16301== Memcheck, a memory error detector ==16301== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al. ==16301== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info ==16301== Command: ./test-c-define ==16301== p is #<point* #2 0x5c04640> release-point called Bye. ==16301== ==16301== HEAP SUMMARY: ==16301== in use at exit: 71 bytes in 1 blocks ==16301== total heap usage: 153 allocs, 152 frees, 4,247,198 bytes allocated ==16301== ==16301== 71 bytes in 1 blocks are definitely lost in loss record 1 of 1 ==16301== at 0x4C2B6CD: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==16301== by 0x4C922E: ___alloc_mem (os_base.c:185) ==16301== by 0x4B7DB5: alloc_mem_aligned (mem.c:452) ==16301== by 0x4B8C57: alloc_scmobj_still (mem.c:1245) ==16301== by 0x4B8D61: ___alloc_scmobj (mem.c:1285) ==16301== by 0x4B8E44: ___make_vector (mem.c:1362) ==16301== by 0x4C677B: ___make_sfun_stack_marker (c_intf.c:6452) ==16301== by 0x4B359E: scm_release_point (test-c-define.c:139) ==16301== by 0x4B354B: c_release_point (test-c-define.c:130) ==16301== by 0x4C24D7: ___release_foreign (c_intf.c:1713) ==16301== by 0x4BC354: free_unmarked_still_objs (mem.c:3271) ==16301== by 0x4BE922: ___garbage_collect (mem.c:4698) ==16301== ==16301== LEAK SUMMARY: ==16301== definitely lost: 71 bytes in 1 blocks ==16301== indirectly lost: 0 bytes in 0 blocks ==16301== possibly lost: 0 bytes in 0 blocks ==16301== still reachable: 0 bytes in 0 blocks ==16301== suppressed: 0 bytes in 0 blocks ==16301== ==16301== For counts of detected and suppressed errors, rerun with: -v ==16301== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 2 from 2)