0,0 → 1,154 |
/* |
** $Id: lcorolib.c,v 1.3 2011/08/23 17:24:34 roberto Exp $ |
** Coroutine Library |
** See Copyright Notice in lua.h |
*/ |
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#include <stdlib.h> |
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#define lcorolib_c |
#define LUA_LIB |
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#include "lua.h" |
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#include "lauxlib.h" |
#include "lualib.h" |
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static int auxresume (lua_State *L, lua_State *co, int narg) { |
int status; |
if (!lua_checkstack(co, narg)) { |
lua_pushliteral(L, "too many arguments to resume"); |
return -1; /* error flag */ |
} |
if (lua_status(co) == LUA_OK && lua_gettop(co) == 0) { |
lua_pushliteral(L, "cannot resume dead coroutine"); |
return -1; /* error flag */ |
} |
lua_xmove(L, co, narg); |
status = lua_resume(co, L, narg); |
if (status == LUA_OK || status == LUA_YIELD) { |
int nres = lua_gettop(co); |
if (!lua_checkstack(L, nres + 1)) { |
lua_pop(co, nres); /* remove results anyway */ |
lua_pushliteral(L, "too many results to resume"); |
return -1; /* error flag */ |
} |
lua_xmove(co, L, nres); /* move yielded values */ |
return nres; |
} |
else { |
lua_xmove(co, L, 1); /* move error message */ |
return -1; /* error flag */ |
} |
} |
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static int luaB_coresume (lua_State *L) { |
lua_State *co = lua_tothread(L, 1); |
int r; |
luaL_argcheck(L, co, 1, "coroutine expected"); |
r = auxresume(L, co, lua_gettop(L) - 1); |
if (r < 0) { |
lua_pushboolean(L, 0); |
lua_insert(L, -2); |
return 2; /* return false + error message */ |
} |
else { |
lua_pushboolean(L, 1); |
lua_insert(L, -(r + 1)); |
return r + 1; /* return true + `resume' returns */ |
} |
} |
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static int luaB_auxwrap (lua_State *L) { |
lua_State *co = lua_tothread(L, lua_upvalueindex(1)); |
int r = auxresume(L, co, lua_gettop(L)); |
if (r < 0) { |
if (lua_isstring(L, -1)) { /* error object is a string? */ |
luaL_where(L, 1); /* add extra info */ |
lua_insert(L, -2); |
lua_concat(L, 2); |
} |
lua_error(L); /* propagate error */ |
} |
return r; |
} |
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static int luaB_cocreate (lua_State *L) { |
lua_State *NL = lua_newthread(L); |
luaL_checktype(L, 1, LUA_TFUNCTION); |
lua_pushvalue(L, 1); /* move function to top */ |
lua_xmove(L, NL, 1); /* move function from L to NL */ |
return 1; |
} |
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static int luaB_cowrap (lua_State *L) { |
luaB_cocreate(L); |
lua_pushcclosure(L, luaB_auxwrap, 1); |
return 1; |
} |
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static int luaB_yield (lua_State *L) { |
return lua_yield(L, lua_gettop(L)); |
} |
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static int luaB_costatus (lua_State *L) { |
lua_State *co = lua_tothread(L, 1); |
luaL_argcheck(L, co, 1, "coroutine expected"); |
if (L == co) lua_pushliteral(L, "running"); |
else { |
switch (lua_status(co)) { |
case LUA_YIELD: |
lua_pushliteral(L, "suspended"); |
break; |
case LUA_OK: { |
lua_Debug ar; |
if (lua_getstack(co, 0, &ar) > 0) /* does it have frames? */ |
lua_pushliteral(L, "normal"); /* it is running */ |
else if (lua_gettop(co) == 0) |
lua_pushliteral(L, "dead"); |
else |
lua_pushliteral(L, "suspended"); /* initial state */ |
break; |
} |
default: /* some error occurred */ |
lua_pushliteral(L, "dead"); |
break; |
} |
} |
return 1; |
} |
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static int luaB_corunning (lua_State *L) { |
int ismain = lua_pushthread(L); |
lua_pushboolean(L, ismain); |
return 2; |
} |
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static const luaL_Reg co_funcs[] = { |
{"create", luaB_cocreate}, |
{"resume", luaB_coresume}, |
{"running", luaB_corunning}, |
{"status", luaB_costatus}, |
{"wrap", luaB_cowrap}, |
{"yield", luaB_yield}, |
{NULL, NULL} |
}; |
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LUAMOD_API int luaopen_coroutine (lua_State *L) { |
luaL_newlib(L, co_funcs); |
return 1; |
} |
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