#include "private/gc_priv.h"
# ifdef STUBBORN_ALLOC
extern ptr_t GC_clear_stack();
#define GENERAL_MALLOC(lb,k) \
(GC_PTR)GC_clear_stack(GC_generic_malloc((word)lb, k))
GC_PTR * GC_changing_list_start;
void GC_push_stubborn_structures GC_PROTO((void))
{
GC_push_all((ptr_t)(&GC_changing_list_start),
(ptr_t)(&GC_changing_list_start) + sizeof(GC_PTR *));
}
# ifdef THREADS
VOLATILE GC_PTR * VOLATILE GC_changing_list_current;
# else
GC_PTR * GC_changing_list_current;
# endif
GC_PTR * GC_changing_list_limit;
void GC_stubborn_init()
{
# define INIT_SIZE 10
GC_changing_list_start = (GC_PTR *)
GC_INTERNAL_MALLOC(
(word)(INIT_SIZE * sizeof(GC_PTR)),
PTRFREE);
BZERO(GC_changing_list_start,
INIT_SIZE * sizeof(GC_PTR));
if (GC_changing_list_start == 0) {
GC_err_printf0("Insufficient space to start up\n");
ABORT("GC_stubborn_init: put of space");
}
GC_changing_list_current = GC_changing_list_start;
GC_changing_list_limit = GC_changing_list_start + INIT_SIZE - 1;
* GC_changing_list_limit = 0;
}
GC_bool GC_compact_changing_list()
{
register GC_PTR *p, *q;
register word count = 0;
word old_size = (char **)GC_changing_list_limit
- (char **)GC_changing_list_start+1;
register word new_size = old_size;
GC_PTR * new_list;
for (p = GC_changing_list_start; p < GC_changing_list_limit; p++) {
if (*p != 0) count++;
}
if (2 * count > old_size) new_size = 2 * count;
new_list = (GC_PTR *)
GC_INTERNAL_MALLOC(
new_size * sizeof(GC_PTR), PTRFREE);
if (new_list == 0) return(FALSE);
BZERO(new_list, new_size * sizeof(GC_PTR));
q = new_list;
for (p = GC_changing_list_start; p < GC_changing_list_limit; p++) {
if (*p != 0) *q++ = *p;
}
GC_changing_list_start = new_list;
GC_changing_list_limit = new_list + new_size - 1;
GC_changing_list_current = q;
return(TRUE);
}
# define ADD_CHANGING(p) \
{ \
register struct hblk * h = HBLKPTR(p); \
register word index = PHT_HASH(h); \
\
set_pht_entry_from_index(GC_changed_pages, index); \
} \
if (*GC_changing_list_current != 0 \
&& ++GC_changing_list_current == GC_changing_list_limit) { \
if (!GC_compact_changing_list()) (p) = 0; \
} \
*GC_changing_list_current = p;
void GC_change_stubborn(p)
GC_PTR p;
{
DCL_LOCK_STATE;
DISABLE_SIGNALS();
LOCK();
ADD_CHANGING(p);
UNLOCK();
ENABLE_SIGNALS();
}
void GC_end_stubborn_change(p)
GC_PTR p;
{
# ifdef THREADS
register VOLATILE GC_PTR * my_current = GC_changing_list_current;
# else
register GC_PTR * my_current = GC_changing_list_current;
# endif
register GC_bool tried_quick;
DCL_LOCK_STATE;
if (*my_current == p) {
*my_current = 0;
# ifdef THREADS
if (my_current == GC_changing_list_current) {
return;
}
tried_quick = TRUE;
# else
return;
# endif
} else {
tried_quick = FALSE;
}
DISABLE_SIGNALS();
LOCK();
my_current = GC_changing_list_current;
for (; my_current >= GC_changing_list_start; my_current--) {
if (*my_current == p) {
*my_current = 0;
UNLOCK();
ENABLE_SIGNALS();
return;
}
}
if (!tried_quick) {
GC_err_printf1("Bad arg to GC_end_stubborn_change: 0x%lx\n",
(unsigned long)p);
ABORT("Bad arg to GC_end_stubborn_change");
}
UNLOCK();
ENABLE_SIGNALS();
}
# ifdef __STDC__
GC_PTR GC_malloc_stubborn(size_t lb)
# else
GC_PTR GC_malloc_stubborn(lb)
size_t lb;
# endif
{
register ptr_t op;
register ptr_t *opp;
register word lw;
ptr_t result;
DCL_LOCK_STATE;
if( SMALL_OBJ(lb) ) {
# ifdef MERGE_SIZES
lw = GC_size_map[lb];
# else
lw = ALIGNED_WORDS(lb);
# endif
opp = &(GC_sobjfreelist[lw]);
FASTLOCK();
if( !FASTLOCK_SUCCEEDED() || (op = *opp) == 0 ) {
FASTUNLOCK();
result = GC_generic_malloc((word)lb, STUBBORN);
goto record;
}
*opp = obj_link(op);
obj_link(op) = 0;
GC_words_allocd += lw;
result = (GC_PTR) op;
ADD_CHANGING(result);
FASTUNLOCK();
return((GC_PTR)result);
} else {
result = (GC_PTR)
GC_generic_malloc((word)lb, STUBBORN);
}
record:
DISABLE_SIGNALS();
LOCK();
ADD_CHANGING(result);
UNLOCK();
ENABLE_SIGNALS();
return((GC_PTR)GC_clear_stack(result));
}
void GC_read_changed()
{
register GC_PTR * p = GC_changing_list_start;
register GC_PTR q;
register struct hblk * h;
register word index;
if (p == 0) return;
BCOPY(GC_changed_pages, GC_prev_changed_pages,
(sizeof GC_changed_pages));
BZERO(GC_changed_pages, (sizeof GC_changed_pages));
for (; p <= GC_changing_list_current; p++) {
if ((q = *p) != 0) {
h = HBLKPTR(q);
index = PHT_HASH(h);
set_pht_entry_from_index(GC_changed_pages, index);
}
}
}
GC_bool GC_page_was_changed(h)
struct hblk * h;
{
register word index = PHT_HASH(h);
return(get_pht_entry_from_index(GC_prev_changed_pages, index));
}
void GC_clean_changing_list()
{
register GC_PTR * p = GC_changing_list_start;
register GC_PTR q;
register ptr_t r;
register unsigned long count = 0;
register unsigned long dropped_count = 0;
if (p == 0) return;
for (; p <= GC_changing_list_current; p++) {
if ((q = *p) != 0) {
count++;
r = (ptr_t)GC_base(q);
if (r == 0 || !GC_is_marked(r)) {
*p = 0;
dropped_count++;
}
}
}
# ifdef PRINTSTATS
if (count > 0) {
GC_printf2("%lu entries in changing list: reclaimed %lu\n",
(unsigned long)count, (unsigned long)dropped_count);
}
# endif
}
#else
# ifdef __STDC__
GC_PTR GC_malloc_stubborn(size_t lb)
# else
GC_PTR GC_malloc_stubborn(lb)
size_t lb;
# endif
{
return(GC_malloc(lb));
}
void GC_end_stubborn_change(p)
GC_PTR p;
{
}
void GC_change_stubborn(p)
GC_PTR p;
{
}
void GC_push_stubborn_structures GC_PROTO((void))
{
}
#endif