FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/lua/lcorolib.c

     /*
     ** $Id: lcorolib.c,v 1.5.1.1 2013/04/12 18:48:47 roberto Exp $
     ** Coroutine Library
     ** See Copyright Notice in lua.h
     */
     
     
     #define lcorolib_c
     #define LUA_LIB
    
    #include <sys/lua/lua.h>
    
    #include <sys/lua/lauxlib.h>
    #include <sys/lua/lualib.h>
    
    
    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 = lua_tothread(L, 1);
      int r;
      luaL_argcheck(L, co, 1, "coroutine expected");
      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_isstring(L, -1)) {  /* 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 = lua_tothread(L, 1);
     luaL_argcheck(L, co, 1, "coroutine expected");
     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_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},
     {NULL, NULL}
   };
   
   
   
   LUAMOD_API int luaopen_coroutine (lua_State *L) {
     luaL_newlib(L, co_funcs);
     return 1;
   }
   
   #if defined(_KERNEL)
   
   EXPORT_SYMBOL(luaopen_coroutine);
   
   #endif

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