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resist errors in finalizers during lua_close

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This commit is contained in:
Roberto Ierusalimschy 2003-02-10 15:32:50 -02:00
parent 3184314bf3
commit 6f207b15fb
3 changed files with 18 additions and 15 deletions
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16
lgc.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lgc.c,v 1.166 2002/12/04 17:38:31 roberto Exp roberto $
** $Id: lgc.c,v 1.167 2002/12/19 11:11:55 roberto Exp roberto $
** Garbage Collector
** See Copyright Notice in lua.h
*/
@ -110,7 +110,7 @@ static void marktmu (GCState *st) {
/* move `dead' udata that need finalization to list `tmudata' */
static void separateudata (lua_State *L) {
void luaC_separateudata (lua_State *L) {
GCObject **p = &G(L)->rootudata;
GCObject *curr;
GCObject *collected = NULL; /* to collect udata with gc event */
@ -411,7 +411,7 @@ static void do1gcTM (lua_State *L, Udata *udata) {
}
static void callGCTM (lua_State *L) {
void luaC_callGCTM (lua_State *L) {
lu_byte oldah = L->allowhook;
L->allowhook = 0; /* stop debug hooks during GC tag methods */
L->top++; /* reserve space to keep udata while runs its gc method */
@ -431,12 +431,6 @@ static void callGCTM (lua_State *L) {
}
void luaC_callallgcTM (lua_State *L) {
separateudata(L);
callGCTM(L); /* call their GC tag methods */
}
void luaC_sweep (lua_State *L, int all) {
if (all) all = 256; /* larger than any mark */
sweeplist(L, &G(L)->rootudata, all);
@ -469,7 +463,7 @@ static void mark (lua_State *L) {
wkv = st.wkv; /* keys must be cleared after preserving udata */
st.wkv = NULL;
st.wv = NULL;
separateudata(L); /* separate userdata to be preserved */
luaC_separateudata(L); /* separate userdata to be preserved */
marktmu(&st); /* mark `preserved' userdata */
propagatemarks(&st); /* remark, to propagate `preserveness' */
cleartablekeys(wkv);
@ -485,7 +479,7 @@ void luaC_collectgarbage (lua_State *L) {
mark(L);
luaC_sweep(L, 0);
checkSizes(L);
callGCTM(L);
luaC_callGCTM(L);
}

5
lgc.h
View File

@ -1,5 +1,5 @@
/*
** $Id: lgc.h,v 1.16 2002/08/30 19:09:21 roberto Exp roberto $
** $Id: lgc.h,v 1.17 2002/11/25 12:38:47 roberto Exp roberto $
** Garbage Collector
** See Copyright Notice in lua.h
*/
@ -15,7 +15,8 @@
luaC_collectgarbage(L)
void luaC_callallgcTM (lua_State *L);
void luaC_separateudata (lua_State *L);
void luaC_callGCTM (lua_State *L);
void luaC_sweep (lua_State *L, int all);
void luaC_collectgarbage (lua_State *L);
void luaC_link (lua_State *L, GCObject *o, lu_byte tt);

12
lstate.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lstate.c,v 1.117 2002/12/04 17:38:31 roberto Exp roberto $
** $Id: lstate.c,v 1.118 2002/12/19 13:21:08 roberto Exp roberto $
** Global State
** See Copyright Notice in lua.h
*/
@ -197,10 +197,18 @@ LUA_API lua_State *lua_open (void) {
}
static void callallgcTM (lua_State *L, void *ud) {
UNUSED(ud);
luaC_callGCTM(L); /* call GC metamethods for all udata */
}
LUA_API void lua_close (lua_State *L) {
lua_lock(L);
L = G(L)->mainthread; /* only the main thread can be closed */
luaC_callallgcTM(L); /* call GC tag methods for all udata */
luaC_separateudata(L); /* separate udata that have GC metamethods */
/* repeat until no more errors */
while (luaD_rawrunprotected(L, callallgcTM, NULL) != 0) /* skip */;
lua_assert(G(L)->tmudata == NULL);
close_state(L);
}