/*** $Id: lstate.h,v 2.24 2006/02/06 18:27:59 roberto Exp $** Global State** See Copyright Notice in lua.h*/#ifndef lstate_h#define lstate_h#include "lua.h"#include "lobject.h"#include "ltm.h"#include "lzio.h"struct lua_longjmp;  /* defined in ldo.c *//* table of globals */#define gt(L)	(&L->l_gt)/* registry */#define registry(L)	(&G(L)->l_registry)/* extra stack space to handle TM calls and some other extras */#define EXTRA_STACK   5#define BASIC_CI_SIZE           8#define BASIC_STACK_SIZE        (2*LUA_MINSTACK)typedef struct stringtable {  GCObject **hash;  lu_int32 nuse;  /* number of elements */  int size;} stringtable;/*** informations about a call*/typedef struct CallInfo {  StkId base;  /* base for this function */  StkId func;  /* function index in the stack */  StkId	top;  /* top for this function */  const Instruction *savedpc;  int nresults;  /* expected number of results from this function */  int tailcalls;  /* number of tail calls lost under this entry */} CallInfo;#define curr_func(L)	(clvalue(L->ci->func))#define ci_func(ci)	(clvalue((ci)->func))#define f_isLua(ci)	(!ci_func(ci)->c.isC)#define isLua(ci)	(ttisfunction((ci)->func) && f_isLua(ci))/*** `global state', shared by all threads of this state*/typedef struct global_State {  stringtable strt;  /* hash table for strings */  lua_Alloc frealloc;  /* function to reallocate memory */  void *ud;         /* auxiliary data to `frealloc' */  lu_byte currentwhite;  lu_byte gcstate;  /* state of garbage collector */  int sweepstrgc;  /* position of sweep in `strt' */  GCObject *rootgc;  /* list of all collectable objects */  GCObject **sweepgc;  /* position of sweep in `rootgc' */  GCObject *gray;  /* list of gray objects */  GCObject *grayagain;  /* list of objects to be traversed atomically */  GCObject *weak;  /* list of weak tables (to be cleared) */  GCObject *tmudata;  /* last element of list of userdata to be GC */  Mbuffer buff;  /* temporary buffer for string concatentation */  lu_mem GCthreshold;  lu_mem totalbytes;  /* number of bytes currently allocated */  lu_mem estimate;  /* an estimate of number of bytes actually in use */  lu_mem gcdept;  /* how much GC is `behind schedule' */  int gcpause;  /* size of pause between successive GCs */  int gcstepmul;  /* GC `granularity' */  lua_CFunction panic;  /* to be called in unprotected errors */  TValue l_registry;  struct lua_State *mainthread;  UpVal uvhead;  /* head of double-linked list of all open upvalues */  struct Table *mt[NUM_TAGS];  /* metatables for basic types */  TString *tmname[TM_N];  /* array with tag-method names */} global_State;/*** `per thread' state*/struct lua_State {  CommonHeader;  lu_byte status;  StkId top;  /* first free slot in the stack */  StkId base;  /* base of current function */  global_State *l_G;  CallInfo *ci;  /* call info for current function */  const Instruction *savedpc;  /* `savedpc' of current function */  StkId stack_last;  /* last free slot in the stack */  StkId stack;  /* stack base */  CallInfo *end_ci;  /* points after end of ci array*/  CallInfo *base_ci;  /* array of CallInfo's */  int stacksize;  int size_ci;  /* size of array `base_ci' */  unsigned short nCcalls;  /* number of nested C calls */  lu_byte hookmask;  lu_byte allowhook;  int basehookcount;  int hookcount;  lua_Hook hook;  TValue l_gt;  /* table of globals */  TValue env;  /* temporary place for environments */  GCObject *openupval;  /* list of open upvalues in this stack */  GCObject *gclist;  struct lua_longjmp *errorJmp;  /* current error recover point */  ptrdiff_t errfunc;  /* current error handling function (stack index) */};#define G(L)	(L->l_G)/*** Union of all collectable objects*/union GCObject {  GCheader gch;  union TString ts;  union Udata u;  union Closure cl;  struct Table h;  struct Proto p;  struct UpVal uv;  struct lua_State th;  /* thread */};/* macros to convert a GCObject into a specific value */#define rawgco2ts(o)	check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))#define gco2ts(o)	(&rawgco2ts(o)->tsv)#define rawgco2u(o)	check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))#define gco2u(o)	(&rawgco2u(o)->uv)#define gco2cl(o)	check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl))#define gco2h(o)	check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h))#define gco2p(o)	check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p))#define gco2uv(o)	check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv))#define ngcotouv(o) \	check_exp((o) == NULL || (o)->gch.tt == LUA_TUPVAL, &((o)->uv))#define gco2th(o)	check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th))/* macro to convert any Lua object into a GCObject */#define obj2gco(v)	(cast(GCObject *, (v)))LUAI_FUNC lua_State *luaE_newthread (lua_State *L);LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);#endif