2
** $Id: lstate.c,v 2.36.1.2 2008/01/03 15:20:39 roberto Exp $
4
** See Copyright Notice in lua.h
27
#define state_size(x) (sizeof(x) + LUAI_EXTRASPACE)
28
#define fromstate(l) (cast(lu_byte *, (l)) - LUAI_EXTRASPACE)
29
#define tostate(l) (cast(lua_State *, cast(lu_byte *, l) + LUAI_EXTRASPACE))
33
** Main thread combines a thread state and the global state
42
static void stack_init (lua_State *L1, lua_State *L) {
43
/* initialize CallInfo array */
44
L1->base_ci = luaM_newvector(L, BASIC_CI_SIZE, CallInfo);
46
L1->size_ci = BASIC_CI_SIZE;
47
L1->end_ci = L1->base_ci + L1->size_ci - 1;
48
/* initialize stack array */
49
L1->stack = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, TValue);
50
L1->stacksize = BASIC_STACK_SIZE + EXTRA_STACK;
52
L1->stack_last = L1->stack+(L1->stacksize - EXTRA_STACK)-1;
53
/* initialize first ci */
54
L1->ci->func = L1->top;
55
setnilvalue(L1->top++); /* `function' entry for this `ci' */
56
L1->base = L1->ci->base = L1->top;
57
L1->ci->top = L1->top + LUA_MINSTACK;
61
static void freestack (lua_State *L, lua_State *L1) {
62
luaM_freearray(L, L1->base_ci, L1->size_ci, CallInfo);
63
luaM_freearray(L, L1->stack, L1->stacksize, TValue);
68
** open parts that may cause memory-allocation errors
70
static void f_luaopen (lua_State *L, void *ud) {
71
global_State *g = G(L);
73
stack_init(L, L); /* init stack */
74
sethvalue(L, gt(L), luaH_new(L, 0, 2)); /* table of globals */
75
sethvalue(L, registry(L), luaH_new(L, 0, 2)); /* registry */
76
luaS_resize(L, MINSTRTABSIZE); /* initial size of string table */
79
luaS_fix(luaS_newliteral(L, MEMERRMSG));
80
g->GCthreshold = 4*g->totalbytes;
84
static void preinit_state (lua_State *L, global_State *g) {
96
L->nCcalls = L->baseCcalls = 0;
98
L->base_ci = L->ci = NULL;
105
static void close_state (lua_State *L) {
106
global_State *g = G(L);
107
luaF_close(L, L->stack); /* close all upvalues for this thread */
108
luaC_freeall(L); /* collect all objects */
109
lua_assert(g->rootgc == obj2gco(L));
110
lua_assert(g->strt.nuse == 0);
111
luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size, TString *);
112
luaZ_freebuffer(L, &g->buff);
114
lua_assert(g->totalbytes == sizeof(LG));
115
(*g->frealloc)(g->ud, fromstate(L), state_size(LG), 0);
119
lua_State *luaE_newthread (lua_State *L) {
120
lua_State *L1 = tostate(luaM_malloc(L, state_size(lua_State)));
121
luaC_link(L, obj2gco(L1), LUA_TTHREAD);
122
preinit_state(L1, G(L));
123
stack_init(L1, L); /* init stack */
124
setobj2n(L, gt(L1), gt(L)); /* share table of globals */
125
L1->hookmask = L->hookmask;
126
L1->basehookcount = L->basehookcount;
129
lua_assert(iswhite(obj2gco(L1)));
134
void luaE_freethread (lua_State *L, lua_State *L1) {
135
luaF_close(L1, L1->stack); /* close all upvalues for this thread */
136
lua_assert(L1->openupval == NULL);
137
luai_userstatefree(L1);
139
luaM_freemem(L, fromstate(L1), state_size(lua_State));
143
LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
147
void *l = (*f)(ud, NULL, 0, state_size(LG));
148
if (l == NULL) return NULL;
153
g->currentwhite = bit2mask(WHITE0BIT, FIXEDBIT);
154
L->marked = luaC_white(g);
155
set2bits(L->marked, FIXEDBIT, SFIXEDBIT);
160
g->uvhead.u.l.prev = &g->uvhead;
161
g->uvhead.u.l.next = &g->uvhead;
162
g->GCthreshold = 0; /* mark it as unfinished state */
166
setnilvalue(registry(L));
167
luaZ_initbuffer(L, &g->buff);
169
g->gcstate = GCSpause;
170
g->rootgc = obj2gco(L);
172
g->sweepgc = &g->rootgc;
177
g->totalbytes = sizeof(LG);
178
g->gcpause = LUAI_GCPAUSE;
179
g->gcstepmul = LUAI_GCMUL;
181
for (i=0; i<NUM_TAGS; i++) g->mt[i] = NULL;
182
if (luaD_rawrunprotected(L, f_luaopen, NULL) != 0) {
183
/* memory allocation error: free partial state */
188
luai_userstateopen(L);
193
static void callallgcTM (lua_State *L, void *ud) {
195
luaC_callGCTM(L); /* call GC metamethods for all udata */
199
LUA_API void lua_close (lua_State *L) {
200
L = G(L)->mainthread; /* only the main thread can be closed */
202
luaF_close(L, L->stack); /* close all upvalues for this thread */
203
luaC_separateudata(L, 1); /* separate udata that have GC metamethods */
204
L->errfunc = 0; /* no error function during GC metamethods */
205
do { /* repeat until no more errors */
207
L->base = L->top = L->ci->base;
208
L->nCcalls = L->baseCcalls = 0;
209
} while (luaD_rawrunprotected(L, callallgcTM, NULL) != 0);
210
lua_assert(G(L)->tmudata == NULL);
211
luai_userstateclose(L);