aboutsummaryrefslogtreecommitdiff
path: root/lua-5.3.5/lcorolib.c
diff options
context:
space:
mode:
Diffstat (limited to 'lua-5.3.5/lcorolib.c')
-rw-r--r--lua-5.3.5/lcorolib.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/lua-5.3.5/lcorolib.c b/lua-5.3.5/lcorolib.c
new file mode 100644
index 0000000..0b17af9
--- /dev/null
+++ b/lua-5.3.5/lcorolib.c
@@ -0,0 +1,168 @@
+/*
+** $Id: lcorolib.c,v 1.10.1.1 2017/04/19 17:20:42 roberto Exp $
+** Coroutine Library
+** See Copyright Notice in lua.h
+*/
+
+#define lcorolib_c
+#define LUA_LIB
+
+#include "lprefix.h"
+
+
+#include <stdlib.h>
+
+#include "lua.h"
+
+#include "lauxlib.h"
+#include "lualib.h"
+
+
+static lua_State *getco (lua_State *L) {
+ lua_State *co = lua_tothread(L, 1);
+ luaL_argcheck(L, co, 1, "thread expected");
+ return co;
+}
+
+
+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 */
+ }
+}
+
+
+static int luaB_coresume (lua_State *L) {
+ lua_State *co = getco(L);
+ int r;
+ 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 */
+ }
+}
+
+
+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_type(L, -1) == LUA_TSTRING) { /* error object is a string? */
+ luaL_where(L, 1); /* add extra info */
+ lua_insert(L, -2);
+ lua_concat(L, 2);
+ }
+ return lua_error(L); /* propagate error */
+ }
+ return r;
+}
+
+
+static int luaB_cocreate (lua_State *L) {
+ lua_State *NL;
+ luaL_checktype(L, 1, LUA_TFUNCTION);
+ NL = lua_newthread(L);
+ lua_pushvalue(L, 1); /* move function to top */
+ lua_xmove(L, NL, 1); /* move function from L to NL */
+ return 1;
+}
+
+
+static int luaB_cowrap (lua_State *L) {
+ luaB_cocreate(L);
+ lua_pushcclosure(L, luaB_auxwrap, 1);
+ return 1;
+}
+
+
+static int luaB_yield (lua_State *L) {
+ return lua_yield(L, lua_gettop(L));
+}
+
+
+static int luaB_costatus (lua_State *L) {
+ lua_State *co = getco(L);
+ 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;
+}
+
+
+static int luaB_yieldable (lua_State *L) {
+ lua_pushboolean(L, lua_isyieldable(L));
+ return 1;
+}
+
+
+static int luaB_corunning (lua_State *L) {
+ int ismain = lua_pushthread(L);
+ lua_pushboolean(L, ismain);
+ return 2;
+}
+
+
+static const luaL_Reg co_funcs[] = {
+ {"create", luaB_cocreate},
+ {"resume", luaB_coresume},
+ {"running", luaB_corunning},
+ {"status", luaB_costatus},
+ {"wrap", luaB_cowrap},
+ {"yield", luaB_yield},
+ {"isyieldable", luaB_yieldable},
+ {NULL, NULL}
+};
+
+
+
+LUAMOD_API int luaopen_coroutine (lua_State *L) {
+ luaL_newlib(L, co_funcs);
+ return 1;
+}
+