I have built Guile 1.8.8.2 on MinGW.
I have wrapped some gtkwave code with Guile and have a memory issue. The following code apparently never frees ‘s’, but I am not sure why.
SCM_DEFINE (libguile_fst_writer_emit_value, "libguile-fst-writer-emit-value",
3,0,0,
(SCM scm_ctx, SCM scm_fsthandle, SCM scm_val),
"Write a change on fstHandle")
{
// Storage for temporary string
char* s = NULL;
scm_dynwind_begin (0);
scm_dynwind_unwind_handler (free, s, SCM_F_WIND_EXPLICITLY);
s = scm_to_locale_string (scm_val);
fstWriterEmitValueChange(SCM_TO_CTX (scm_ctx),
SCM_TO_FSTHANDLE (scm_fsthandle),
s_buf);
scm_dynwind_end();
return SCM_UNSPECIFIED;
}
The code is called from Scheme land in the following loop:
(let loop ((n 0))
(if (eq? n 10000000) #t
(begin
;; Emit some changes on the signal
(fst-emit-value ctx s (number->string (modulo n 2)))
(fst-emit-value ctx s1 (number->string (modulo (1+ n) 2)))
(fst-emit-time-change ctx n)
(loop (1+ n))
)))
It seems to me that the garbage collector never gets a chance to run, so how do I make sure that the gc gets a turn?
If I define my function like the following, the leak disappears, but it’s a less desirable solution:
SCM_DEFINE (libguile_fst_writer_emit_value, "libguile-fst-writer-emit-value",
3,0,0,
(SCM scm_ctx, SCM scm_fsthandle, SCM scm_val),
"Write a change on fstHandle")
{
// Storage for temporary string
char s_buf [1024];
scm_to_locale_stringbuf (scm_val, s_buf, 1024);
s = scm_to_locale_string (scm_val);
fstWriterEmitValueChange(SCM_TO_CTX (scm_ctx),
SCM_TO_FSTHANDLE (scm_fsthandle),
s_buf);
return SCM_UNSPECIFIED;
}
Any suggestion?
Thanks,
Brad