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/*
smobs.cc -- implement Smob protection
source file of the GNU LilyPond music typesetter
(c) 2005--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/
#include "smobs.hh"
/*
The CDR contains the actual protected list.
*/
static SCM smob_protection_list = SCM_EOL;
void
init_smob_protection ()
{
smob_protection_list = scm_cons (SCM_BOOL_F, SCM_EOL);
scm_gc_protect_object (smob_protection_list);
}
ADD_SCM_INIT_FUNC (init_smob_protection, init_smob_protection);
LY_DEFINE(ly_smob_protects, "ly:smob-protects",
0, 0, 0, (),
"Return lily's internal smob protection list")
{
return scm_is_pair (smob_protection_list)
? scm_cdr (smob_protection_list)
: SCM_EOL;
}
void
protect_smob (SCM smob, SCM *prot_cons)
{
#if 0
SCM s = scm_cdr (smob_protection_list);
while (scm_is_pair (s) && scm_car (s) == SCM_BOOL_F)
{
s = scm_cdr (s);
}
SCM prot = scm_cons (smob, s);
scm_set_cdr_x (smob_protection_list,
prot);
*prot_cons = prot;
#else
(void) prot_cons;
scm_gc_protect_object (smob);
#endif
}
void
unprotect_smob (SCM smob, SCM *prot_cons)
{
#if 1
(void) prot_cons;
scm_gc_unprotect_object (smob);
#else
SCM next = scm_cdr (*prot_cons);
if (next == SCM_EOL)
scm_set_car_x (*prot_cons, SCM_BOOL_F);
else
{
scm_set_car_x (*prot_cons, SCM_BOOL_F);
while (scm_is_pair (next)
&& scm_car (next) == SCM_BOOL_F)
next = scm_cdr (next);
scm_set_cdr_x (*prot_cons, next);
}
*prot_cons = SCM_EOL;
#endif
}
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