]>
git.zerfleddert.de Git - proxmark3-svn/blob - liblua/lcorolib.c
2 ** $Id: lcorolib.c,v 1.5 2013/02/21 13:44:53 roberto Exp $
4 ** See Copyright Notice in lua.h
20 static int auxresume (lua_State
*L
, lua_State
*co
, int narg
) {
22 if (!lua_checkstack(co
, narg
)) {
23 lua_pushliteral(L
, "too many arguments to resume");
24 return -1; /* error flag */
26 if (lua_status(co
) == LUA_OK
&& lua_gettop(co
) == 0) {
27 lua_pushliteral(L
, "cannot resume dead coroutine");
28 return -1; /* error flag */
30 lua_xmove(L
, co
, narg
);
31 status
= lua_resume(co
, L
, narg
);
32 if (status
== LUA_OK
|| status
== LUA_YIELD
) {
33 int nres
= lua_gettop(co
);
34 if (!lua_checkstack(L
, nres
+ 1)) {
35 lua_pop(co
, nres
); /* remove results anyway */
36 lua_pushliteral(L
, "too many results to resume");
37 return -1; /* error flag */
39 lua_xmove(co
, L
, nres
); /* move yielded values */
43 lua_xmove(co
, L
, 1); /* move error message */
44 return -1; /* error flag */
49 static int luaB_coresume (lua_State
*L
) {
50 lua_State
*co
= lua_tothread(L
, 1);
52 luaL_argcheck(L
, co
, 1, "coroutine expected");
53 r
= auxresume(L
, co
, lua_gettop(L
) - 1);
55 lua_pushboolean(L
, 0);
57 return 2; /* return false + error message */
60 lua_pushboolean(L
, 1);
61 lua_insert(L
, -(r
+ 1));
62 return r
+ 1; /* return true + `resume' returns */
67 static int luaB_auxwrap (lua_State
*L
) {
68 lua_State
*co
= lua_tothread(L
, lua_upvalueindex(1));
69 int r
= auxresume(L
, co
, lua_gettop(L
));
71 if (lua_isstring(L
, -1)) { /* error object is a string? */
72 luaL_where(L
, 1); /* add extra info */
76 return lua_error(L
); /* propagate error */
82 static int luaB_cocreate (lua_State
*L
) {
84 luaL_checktype(L
, 1, LUA_TFUNCTION
);
85 NL
= lua_newthread(L
);
86 lua_pushvalue(L
, 1); /* move function to top */
87 lua_xmove(L
, NL
, 1); /* move function from L to NL */
92 static int luaB_cowrap (lua_State
*L
) {
94 lua_pushcclosure(L
, luaB_auxwrap
, 1);
99 static int luaB_yield (lua_State
*L
) {
100 return lua_yield(L
, lua_gettop(L
));
104 static int luaB_costatus (lua_State
*L
) {
105 lua_State
*co
= lua_tothread(L
, 1);
106 luaL_argcheck(L
, co
, 1, "coroutine expected");
107 if (L
== co
) lua_pushliteral(L
, "running");
109 switch (lua_status(co
)) {
111 lua_pushliteral(L
, "suspended");
115 if (lua_getstack(co
, 0, &ar
) > 0) /* does it have frames? */
116 lua_pushliteral(L
, "normal"); /* it is running */
117 else if (lua_gettop(co
) == 0)
118 lua_pushliteral(L
, "dead");
120 lua_pushliteral(L
, "suspended"); /* initial state */
123 default: /* some error occurred */
124 lua_pushliteral(L
, "dead");
132 static int luaB_corunning (lua_State
*L
) {
133 int ismain
= lua_pushthread(L
);
134 lua_pushboolean(L
, ismain
);
139 static const luaL_Reg co_funcs
[] = {
140 {"create", luaB_cocreate
},
141 {"resume", luaB_coresume
},
142 {"running", luaB_corunning
},
143 {"status", luaB_costatus
},
144 {"wrap", luaB_cowrap
},
145 {"yield", luaB_yield
},
151 LUAMOD_API
int luaopen_coroutine (lua_State
*L
) {
152 luaL_newlib(L
, co_funcs
);