 |
lua-l archive |
|
|
||
|
|
I’m looping forever when calling luaC_fullgc and can not realize why it is happening. Every call do singlestep() does nothing and sweeplist() keeps trying to mark objects as white in every call.
At this moment, my debugger shows deadmask==33(0x21) and all are gch.marked==2. Can someone figure out situations where it may happen? It differs from Makoto Hamanaka on 01 Jul 2008 report where the looping root cause was in
LUA_GCSTEP. static
GCObject **sweeplist (lua_State
*L,
GCObject **p,
lu_mem
count) {
GCObject *curr;
global_State *g =
G(L);
int deadmask =
otherwhite(g);
while ((curr = *p)
!= NULL &&
count-- > 0) {
if (curr->gch.tt ==
LUA_TTHREAD)
/* sweep open upvalues of each thread */
sweepwholelist(L,
&gco2th(curr)->openupval);
if ((curr->gch.marked ^
WHITEBITS) & deadmask) {
/* not dead? */
//only this branch runs every call
lua_assert(!isdead(g,
curr) || testbit(curr->gch.marked,
FIXEDBIT));
makewhite(g, curr);
/* make it white (for next cycle) */
p = &curr->gch.next; }
else {
/* must erase `curr' */
lua_assert(isdead(g,
curr) || deadmask == bitmask(SFIXEDBIT)); *p
= curr->gch.next;
if (curr == g->rootgc)
/* is the first element of the list? */ g->rootgc = curr->gch.next;
/* adjust first */ freeobj(L,
curr); } }
return
p; } static
l_mem singlestep (lua_State
*L) {
... case
GCSsweep: {
lu_mem old = g->totalbytes; g->sweepgc = sweeplist(L,
g->sweepgc, GCSWEEPMAX);
if (*g->sweepgc ==
NULL) {
/* nothing more to sweep? */
//this branch is never executed checkSizes(L); g->gcstate =
GCSfinalize;
/* end sweep phase */ }
lua_assert(old >= g->totalbytes); g->estimate -= old - g->totalbytes;
//here
old has the same value as g->totalbytes
return
GCSWEEPMAX*GCSWEEPCOST; } ... } void luaC_fullgc (lua_State
*L) {
... /* finish any pending sweep phase */
while (g->gcstate !=
GCSfinalize) {
lua_assert(g->gcstate ==
GCSsweepstring || g->gcstate ==
GCSsweep); singlestep(L); } ... } Wagner Fernando Fázio Especialista em Plataforma de Terminais POS +55 11 2587 2799 wagner.fazio@userede.com.br Av. Eusébio Matoso, 891 Centro Administrativo Pinheiros – 14º andar 05423-010 São Paulo - SP fanáticos por performance Esse é o Nosso Jeito ============================================================================================================================================== Este destinatario e externo a sua organizacao. Este e-mail e confidencial e pode conter informacoes privilegiadas. Se voce nao for o destinatario desta mensagem por favor delete-a e me informe no endereco acima. Nao copie ou reenvie de forma a revelar estas informacoes a outras pessoas ou utilize-as para qualquer proposito. This recipient is external to your organization. This e-mail is confidential and may also be privileged. If you are not intended recipient, please delete it and notify me immediately at above address; do not copy, forward or other side disclose the contents of this e-mail to any other person or use it for any purpose. |
