|
1866
|
1 /*
|
|
|
2 ** $Id: lcorolib.c,v 1.5 2013/02/21 13:44:53 roberto Exp $
|
|
|
3 ** Coroutine Library
|
|
|
4 ** See Copyright Notice in lua.h
|
|
|
5 */
|
|
|
6
|
|
|
7
|
|
|
8 #include <stdlib.h>
|
|
|
9
|
|
|
10
|
|
|
11 #define lcorolib_c
|
|
|
12 #define LUA_LIB
|
|
|
13
|
|
|
14 #include "lua.h"
|
|
|
15
|
|
|
16 #include "lauxlib.h"
|
|
|
17 #include "lualib.h"
|
|
|
18
|
|
|
19
|
|
|
20 static int auxresume (lua_State *L, lua_State *co, int narg) {
|
|
|
21 int status;
|
|
|
22 if (!lua_checkstack(co, narg)) {
|
|
|
23 lua_pushliteral(L, "too many arguments to resume");
|
|
|
24 return -1; /* error flag */
|
|
|
25 }
|
|
|
26 if (lua_status(co) == LUA_OK && lua_gettop(co) == 0) {
|
|
|
27 lua_pushliteral(L, "cannot resume dead coroutine");
|
|
|
28 return -1; /* error flag */
|
|
|
29 }
|
|
|
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 */
|
|
|
38 }
|
|
|
39 lua_xmove(co, L, nres); /* move yielded values */
|
|
|
40 return nres;
|
|
|
41 }
|
|
|
42 else {
|
|
|
43 lua_xmove(co, L, 1); /* move error message */
|
|
|
44 return -1; /* error flag */
|
|
|
45 }
|
|
|
46 }
|
|
|
47
|
|
|
48
|
|
|
49 static int luaB_coresume (lua_State *L) {
|
|
|
50 lua_State *co = lua_tothread(L, 1);
|
|
|
51 int r;
|
|
|
52 luaL_argcheck(L, co, 1, "coroutine expected");
|
|
|
53 r = auxresume(L, co, lua_gettop(L) - 1);
|
|
|
54 if (r < 0) {
|
|
|
55 lua_pushboolean(L, 0);
|
|
|
56 lua_insert(L, -2);
|
|
|
57 return 2; /* return false + error message */
|
|
|
58 }
|
|
|
59 else {
|
|
|
60 lua_pushboolean(L, 1);
|
|
|
61 lua_insert(L, -(r + 1));
|
|
|
62 return r + 1; /* return true + `resume' returns */
|
|
|
63 }
|
|
|
64 }
|
|
|
65
|
|
|
66
|
|
|
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));
|
|
|
70 if (r < 0) {
|
|
|
71 if (lua_isstring(L, -1)) { /* error object is a string? */
|
|
|
72 luaL_where(L, 1); /* add extra info */
|
|
|
73 lua_insert(L, -2);
|
|
|
74 lua_concat(L, 2);
|
|
|
75 }
|
|
|
76 return lua_error(L); /* propagate error */
|
|
|
77 }
|
|
|
78 return r;
|
|
|
79 }
|
|
|
80
|
|
|
81
|
|
|
82 static int luaB_cocreate (lua_State *L) {
|
|
|
83 lua_State *NL;
|
|
|
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 */
|
|
|
88 return 1;
|
|
|
89 }
|
|
|
90
|
|
|
91
|
|
|
92 static int luaB_cowrap (lua_State *L) {
|
|
|
93 luaB_cocreate(L);
|
|
|
94 lua_pushcclosure(L, luaB_auxwrap, 1);
|
|
|
95 return 1;
|
|
|
96 }
|
|
|
97
|
|
|
98
|
|
|
99 static int luaB_yield (lua_State *L) {
|
|
|
100 return lua_yield(L, lua_gettop(L));
|
|
|
101 }
|
|
|
102
|
|
|
103
|
|
|
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");
|
|
|
108 else {
|
|
|
109 switch (lua_status(co)) {
|
|
|
110 case LUA_YIELD:
|
|
|
111 lua_pushliteral(L, "suspended");
|
|
|
112 break;
|
|
|
113 case LUA_OK: {
|
|
|
114 lua_Debug ar;
|
|
|
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");
|
|
|
119 else
|
|
|
120 lua_pushliteral(L, "suspended"); /* initial state */
|
|
|
121 break;
|
|
|
122 }
|
|
|
123 default: /* some error occurred */
|
|
|
124 lua_pushliteral(L, "dead");
|
|
|
125 break;
|
|
|
126 }
|
|
|
127 }
|
|
|
128 return 1;
|
|
|
129 }
|
|
|
130
|
|
|
131
|
|
|
132 static int luaB_corunning (lua_State *L) {
|
|
|
133 int ismain = lua_pushthread(L);
|
|
|
134 lua_pushboolean(L, ismain);
|
|
|
135 return 2;
|
|
|
136 }
|
|
|
137
|
|
|
138
|
|
|
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},
|
|
|
146 {NULL, NULL}
|
|
|
147 };
|
|
|
148
|
|
|
149
|
|
|
150
|
|
|
151 LUAMOD_API int luaopen_coroutine (lua_State *L) {
|
|
|
152 luaL_newlib(L, co_funcs);
|
|
|
153 return 1;
|
|
|
154 }
|
|
|
155
|
