168 lines
3.7 KiB
C++
168 lines
3.7 KiB
C++
/*
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** $Id: lcorolib.c,v 1.10 2016/04/11 19:19:55 roberto Exp $
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** Coroutine Library
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** See Copyright Notice in lua.h
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*/
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#define lcorolib_c
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#define LUA_LIB
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#include "lprefix.h"
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#include <stdlib.h>
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#include "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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namespace NS_SLUA {
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static lua_State *getco (lua_State *L) {
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lua_State *co = lua_tothread(L, 1);
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luaL_argcheck(L, co, 1, "thread expected");
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return co;
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}
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static int auxresume (lua_State *L, lua_State *co, int narg) {
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int status;
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if (!lua_checkstack(co, narg)) {
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lua_pushliteral(L, "too many arguments to resume");
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return -1; /* error flag */
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}
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if (lua_status(co) == LUA_OK && lua_gettop(co) == 0) {
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lua_pushliteral(L, "cannot resume dead coroutine");
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return -1; /* error flag */
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}
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lua_xmove(L, co, narg);
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status = lua_resume(co, L, narg);
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if (status == LUA_OK || status == LUA_YIELD) {
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int nres = lua_gettop(co);
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if (!lua_checkstack(L, nres + 1)) {
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lua_pop(co, nres); /* remove results anyway */
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lua_pushliteral(L, "too many results to resume");
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return -1; /* error flag */
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}
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lua_xmove(co, L, nres); /* move yielded values */
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return nres;
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}
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else {
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lua_xmove(co, L, 1); /* move error message */
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return -1; /* error flag */
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}
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}
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static int luaB_coresume (lua_State *L) {
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lua_State *co = getco(L);
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int r;
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r = auxresume(L, co, lua_gettop(L) - 1);
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if (r < 0) {
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lua_pushboolean(L, 0);
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lua_insert(L, -2);
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return 2; /* return false + error message */
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}
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else {
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lua_pushboolean(L, 1);
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lua_insert(L, -(r + 1));
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return r + 1; /* return true + 'resume' returns */
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}
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}
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static int luaB_auxwrap (lua_State *L) {
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lua_State *co = lua_tothread(L, lua_upvalueindex(1));
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int r = auxresume(L, co, lua_gettop(L));
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if (r < 0) {
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if (lua_type(L, -1) == LUA_TSTRING) { /* error object is a string? */
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luaL_where(L, 1); /* add extra info */
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lua_insert(L, -2);
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lua_concat(L, 2);
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}
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return lua_error(L); /* propagate error */
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}
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return r;
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}
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static int luaB_cocreate (lua_State *L) {
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lua_State *NL;
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luaL_checktype(L, 1, LUA_TFUNCTION);
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NL = lua_newthread(L);
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lua_pushvalue(L, 1); /* move function to top */
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lua_xmove(L, NL, 1); /* move function from L to NL */
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return 1;
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}
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static int luaB_cowrap (lua_State *L) {
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luaB_cocreate(L);
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lua_pushcclosure(L, luaB_auxwrap, 1);
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return 1;
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}
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static int luaB_yield (lua_State *L) {
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return lua_yield(L, lua_gettop(L));
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}
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static int luaB_costatus (lua_State *L) {
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lua_State *co = getco(L);
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if (L == co) lua_pushliteral(L, "running");
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else {
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switch (lua_status(co)) {
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case LUA_YIELD:
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lua_pushliteral(L, "suspended");
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break;
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case LUA_OK: {
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lua_Debug ar;
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if (lua_getstack(co, 0, &ar) > 0) /* does it have frames? */
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lua_pushliteral(L, "normal"); /* it is running */
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else if (lua_gettop(co) == 0)
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lua_pushliteral(L, "dead");
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else
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lua_pushliteral(L, "suspended"); /* initial state */
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break;
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}
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default: /* some error occurred */
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lua_pushliteral(L, "dead");
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break;
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}
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}
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return 1;
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}
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static int luaB_yieldable (lua_State *L) {
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lua_pushboolean(L, lua_isyieldable(L));
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return 1;
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}
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static int luaB_corunning (lua_State *L) {
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int ismain = lua_pushthread(L);
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lua_pushboolean(L, ismain);
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return 2;
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}
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static const luaL_Reg co_funcs[] = {
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{"create", luaB_cocreate},
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{"resume", luaB_coresume},
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{"running", luaB_corunning},
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{"status", luaB_costatus},
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{"wrap", luaB_cowrap},
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{"yield", luaB_yield},
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{"isyieldable", luaB_yieldable},
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{NULL, NULL}
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};
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LUAMOD_API int luaopen_coroutine (lua_State *L) {
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luaL_newlib(L, co_funcs);
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return 1;
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}
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} // end NS_SLUA
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