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3 ** $Id: lcorolib.c,v 1.5.1.1 2013/04/12 18:48:47 roberto Exp $
5 ** See Copyright Notice in lua.h
12 #include <sys/lua/lua.h>
14 #include <sys/lua/lauxlib.h>
15 #include <sys/lua/lualib.h>
18 static int auxresume (lua_State
*L
, lua_State
*co
, int narg
) {
20 if (!lua_checkstack(co
, narg
)) {
21 lua_pushliteral(L
, "too many arguments to resume");
22 return -1; /* error flag */
24 if (lua_status(co
) == LUA_OK
&& lua_gettop(co
) == 0) {
25 lua_pushliteral(L
, "cannot resume dead coroutine");
26 return -1; /* error flag */
28 lua_xmove(L
, co
, narg
);
29 status
= lua_resume(co
, L
, narg
);
30 if (status
== LUA_OK
|| status
== LUA_YIELD
) {
31 int nres
= lua_gettop(co
);
32 if (!lua_checkstack(L
, nres
+ 1)) {
33 lua_pop(co
, nres
); /* remove results anyway */
34 lua_pushliteral(L
, "too many results to resume");
35 return -1; /* error flag */
37 lua_xmove(co
, L
, nres
); /* move yielded values */
41 lua_xmove(co
, L
, 1); /* move error message */
42 return -1; /* error flag */
47 static int luaB_coresume (lua_State
*L
) {
48 lua_State
*co
= lua_tothread(L
, 1);
50 luaL_argcheck(L
, co
, 1, "coroutine expected");
51 r
= auxresume(L
, co
, lua_gettop(L
) - 1);
53 lua_pushboolean(L
, 0);
55 return 2; /* return false + error message */
58 lua_pushboolean(L
, 1);
59 lua_insert(L
, -(r
+ 1));
60 return r
+ 1; /* return true + 'resume' returns */
65 static int luaB_auxwrap (lua_State
*L
) {
66 lua_State
*co
= lua_tothread(L
, lua_upvalueindex(1));
67 int r
= auxresume(L
, co
, lua_gettop(L
));
69 if (lua_isstring(L
, -1)) { /* error object is a string? */
70 luaL_where(L
, 1); /* add extra info */
74 return lua_error(L
); /* propagate error */
80 static int luaB_cocreate (lua_State
*L
) {
82 luaL_checktype(L
, 1, LUA_TFUNCTION
);
83 NL
= lua_newthread(L
);
84 lua_pushvalue(L
, 1); /* move function to top */
85 lua_xmove(L
, NL
, 1); /* move function from L to NL */
90 static int luaB_cowrap (lua_State
*L
) {
92 lua_pushcclosure(L
, luaB_auxwrap
, 1);
97 static int luaB_yield (lua_State
*L
) {
98 return lua_yield(L
, lua_gettop(L
));
102 static int luaB_costatus (lua_State
*L
) {
103 lua_State
*co
= lua_tothread(L
, 1);
104 luaL_argcheck(L
, co
, 1, "coroutine expected");
105 if (L
== co
) lua_pushliteral(L
, "running");
107 switch (lua_status(co
)) {
109 lua_pushliteral(L
, "suspended");
113 if (lua_getstack(co
, 0, &ar
) > 0) /* does it have frames? */
114 lua_pushliteral(L
, "normal"); /* it is running */
115 else if (lua_gettop(co
) == 0)
116 lua_pushliteral(L
, "dead");
118 lua_pushliteral(L
, "suspended"); /* initial state */
121 default: /* some error occurred */
122 lua_pushliteral(L
, "dead");
130 static int luaB_corunning (lua_State
*L
) {
131 int ismain
= lua_pushthread(L
);
132 lua_pushboolean(L
, ismain
);
137 static const luaL_Reg co_funcs
[] = {
138 {"create", luaB_cocreate
},
139 {"resume", luaB_coresume
},
140 {"running", luaB_corunning
},
141 {"status", luaB_costatus
},
142 {"wrap", luaB_cowrap
},
143 {"yield", luaB_yield
},
149 LUAMOD_API
int luaopen_coroutine (lua_State
*L
) {
150 luaL_newlib(L
, co_funcs
);
156 EXPORT_SYMBOL(luaopen_coroutine
);