From ae5283dc368b7b2d5f0811f7b74860b46774bd8d Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Fri, 12 Apr 2002 16:57:29 -0300
Subject: `co' library goes with basic library (and not with `tab')

---
 lbaselib.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 78 insertions(+), 1 deletion(-)

(limited to 'lbaselib.c')

diff --git a/lbaselib.c b/lbaselib.c
index b6d4ce8e..2aaafe43 100644
--- a/lbaselib.c
+++ b/lbaselib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lbaselib.c,v 1.65 2002/04/09 19:46:56 roberto Exp roberto $
+** $Id: lbaselib.c,v 1.66 2002/04/09 20:19:06 roberto Exp roberto $
 ** Basic library
 ** See Copyright Notice in lua.h
 */
@@ -421,6 +421,82 @@ static const luaL_reg base_funcs[] = {
 };
 
 
+/*
+** {======================================================
+** Coroutine library
+** =======================================================
+*/
+
+
+static int luaB_resume (lua_State *L) {
+  lua_State *co = (lua_State *)lua_getfrombox(L, lua_upvalueindex(1));
+  lua_settop(L, 0);
+  if (lua_resume(L, co) != 0)
+    lua_error(L, "error running co-routine");
+  return lua_gettop(L);
+}
+
+
+
+static int gc_coroutine (lua_State *L) {
+  lua_State *co = (lua_State *)lua_getfrombox(L, 1);
+  lua_closethread(L, co);
+  return 0;
+}
+
+
+static int luaB_coroutine (lua_State *L) {
+  lua_State *NL;
+  int ref;
+  int i;
+  int n = lua_gettop(L);
+  luaL_arg_check(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1), 1,
+    "Lua function expected");
+  NL = lua_newthread(L);
+  if (NL == NULL) lua_error(L, "unable to create new thread");
+  /* move function and arguments from L to NL */
+  for (i=0; i<n; i++) {
+    ref = lua_ref(L, 1);
+    lua_getref(NL, ref);
+    lua_insert(NL, 1);
+    lua_unref(L, ref);
+  }
+  lua_cobegin(NL, n-1);
+  lua_newpointerbox(L, NL);
+  lua_pushliteral(L, "Coroutine");
+  lua_rawget(L, LUA_REGISTRYINDEX);
+  lua_setmetatable(L, -2);
+  lua_pushcclosure(L, luaB_resume, 1);
+  return 1;
+}
+
+
+static int luaB_yield (lua_State *L) {
+  return lua_yield(L, lua_gettop(L));
+}
+
+static const luaL_reg co_funcs[] = {
+  {"create", luaB_coroutine},
+  {"yield", luaB_yield},
+  {NULL, NULL}
+};
+
+
+static void co_open (lua_State *L) {
+  luaL_opennamedlib(L, "co", co_funcs, 0);
+  /* create metatable for coroutines */
+  lua_pushliteral(L, "Coroutine");
+  lua_newtable(L);
+  lua_pushliteral(L, "__gc");
+  lua_pushcfunction(L, gc_coroutine);
+  lua_rawset(L, -3);
+  lua_rawset(L, LUA_REGISTRYINDEX);
+}
+
+/* }====================================================== */
+
+
+
 static void base_open (lua_State *L) {
   lua_pushliteral(L, "_G");
   lua_pushvalue(L, LUA_GLOBALSINDEX);
@@ -434,6 +510,7 @@ static void base_open (lua_State *L) {
 
 LUALIB_API int lua_baselibopen (lua_State *L) {
   base_open(L);
+  co_open(L);
   /* `require' needs an empty table as upvalue */
   lua_newtable(L);
   lua_pushcclosure(L, luaB_require, 1);
-- 
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