OLD | NEW |
(Empty) | |
| 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 |
OLD | NEW |