X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/0ca1291c2f63ca6235f4b4885c48413a900aade4..cc375ad134c19925e1e343bae932be21cf8a8caf:/src/bindings/lua/simgrid_lua.c

diff --git a/src/bindings/lua/simgrid_lua.c b/src/bindings/lua/simgrid_lua.c
index 593f56fae5..748a9bf8f8 100644
--- a/src/bindings/lua/simgrid_lua.c
+++ b/src/bindings/lua/simgrid_lua.c
@@ -1,612 +1,137 @@
-/* SimGrid Lua bindings                                                     */
-
 /* Copyright (c) 2010. The SimGrid Team.
  * All rights reserved.                                                     */
 
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
-#include "simgrid_lua.h"
-
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(lua, bindings, "Lua Bindings");
-
-lua_State *simgrid_lua_state;
 
-#define TASK_MODULE_NAME "simgrid.Task"
-#define HOST_MODULE_NAME "simgrid.Host"
-// Surf ( bypass XML )
-#define LINK_MODULE_NAME "simgrid.Link"
-#define ROUTE_MODULE_NAME "simgrid.Route"
-#define AS_MODULE_NAME "simgrid.AS"
-#define TRACE_MODULE_NAME "simgrid.Trace"
-
-/* ********************************************************************************* */
-/*                            helper functions                                       */
-/* ********************************************************************************* */
-static void stackDump(const char *msg, lua_State * L)
-{
-  char buff[2048];
-  char *p = buff;
-  int i;
-  int top = lua_gettop(L);
-
-  fflush(stdout);
-  p += sprintf(p, "STACK(top=%d): ", top);
-
-  for (i = 1; i <= top; i++) {  /* repeat for each level */
-    int t = lua_type(L, i);
-    switch (t) {
-
-    case LUA_TSTRING:          /* strings */
-      p += sprintf(p, "`%s'", lua_tostring(L, i));
-      break;
-
-    case LUA_TBOOLEAN:         /* booleans */
-      p += sprintf(p, lua_toboolean(L, i) ? "true" : "false");
-      break;
-
-    case LUA_TNUMBER:          /* numbers */
-      p += sprintf(p, "%g", lua_tonumber(L, i));
-      break;
+/* SimGrid Lua bindings                                                     */
 
-    case LUA_TTABLE:
-      p += sprintf(p, "Table");
-      break;
+#include "lua_private.h"
+#include "lua_state_cloner.h"
+#include "lua_utils.h"
+#include "xbt.h"
+#include "msg/msg.h"
+#include "simdag/simdag.h"
+#include "surf/surfxml_parse.h"
+#include <lauxlib.h>
 
-    default:                   /* other values */
-      p += sprintf(p, "???");
-/*      if ((ptr = luaL_checkudata(L,i,TASK_MODULE_NAME))) {
-        p+=sprintf(p,"task");
-      } else {
-        p+=printf(p,"%s", lua_typename(L, t));
-      }*/
-      break;
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(lua, bindings, "Lua Bindings");
 
-    }
-    p += sprintf(p, "  ");      /* put a separator */
-  }
-  XBT_INFO("%s%s", msg, buff);
-}
+static lua_State* sglua_maestro_state;
 
-/** @brief ensures that a userdata on the stack is a task and returns the pointer inside the userdata */
-static m_task_t checkTask(lua_State * L, int index)
-{
-  m_task_t *pi, tk;
-  luaL_checktype(L, index, LUA_TTABLE);
-  lua_getfield(L, index, "__simgrid_task");
-  pi = (m_task_t *) luaL_checkudata(L, -1, TASK_MODULE_NAME);
-  if (pi == NULL)
-    luaL_typerror(L, index, TASK_MODULE_NAME);
-  tk = *pi;
-  if (!tk)
-    luaL_error(L, "null Task");
-  lua_pop(L, 1);
-  return tk;
-}
+int luaopen_simgrid(lua_State *L);
+static void sglua_register_c_functions(lua_State *L);
+static int run_lua_code(int argc, char **argv);
 
 /* ********************************************************************************* */
-/*                           wrapper functions                                       */
+/*                                  simgrid API                                      */
 /* ********************************************************************************* */
 
 /**
- * A task is either something to compute somewhere, or something to exchange between two hosts (or both).
- * It is defined by a computing amount and a message size.
+ * \brief Deploys your application.
+ * \param L a Lua state
+ * \return number of values returned to Lua
  *
+ * - Argument 1 (string): name of the deployment file to load
  */
+static int launch_application(lua_State* L) {
+
+  const char* file = luaL_checkstring(L, 1);
+  MSG_function_register_default(run_lua_code);
+  MSG_launch_application(file);
+  return 0;
+}
 
-/* *              * *
- * * Constructors * *
- * *              * */
 /**
- * Construct an new task with the specified processing amount and amount
- * of data needed.
+ * \brief Creates the platform.
+ * \param L a Lua state
+ * \return number of values returned to Lua
  *
- * @param name	Task's name
- *
- * @param computeDuration 	A value of the processing amount (in flop) needed to process the task.
- *				If 0, then it cannot be executed with the execute() method.
- *				This value has to be >= 0.
- *
- * @param messageSize		A value of amount of data (in bytes) needed to transfert this task.
- *				If 0, then it cannot be transfered with the get() and put() methods.
- *				This value has to be >= 0.
+ * - Argument 1 (string): name of the platform file to load
  */
-static int Task_new(lua_State * L)
-{
-  XBT_DEBUG("Task new...");
-  const char *name = luaL_checkstring(L, 1);
-  int comp_size = luaL_checkint(L, 2);
-  int msg_size = luaL_checkint(L, 3);
-  m_task_t msg_task = MSG_task_create(name, comp_size, msg_size, NULL);
-  lua_newtable(L);              /* create a table, put the userdata on top of it */
-  m_task_t *lua_task = (m_task_t *) lua_newuserdata(L, sizeof(m_task_t));
-  *lua_task = msg_task;
-  luaL_getmetatable(L, TASK_MODULE_NAME);
-  lua_setmetatable(L, -2);
-  lua_setfield(L, -2, "__simgrid_task");        /* put the userdata as field of the table */
-  /* remove the args from the stack */
-  lua_remove(L, 1);
-  lua_remove(L, 1);
-  lua_remove(L, 1);
-  return 1;
-}
+static int create_environment(lua_State* L) {
 
-static int Task_get_name(lua_State * L)
-{
-  m_task_t tk = checkTask(L, -1);
-  lua_pushstring(L, MSG_task_get_name(tk));
-  return 1;
-}
-
-static int Task_computation_duration(lua_State * L)
-{
-  m_task_t tk = checkTask(L, -1);
-  lua_pushnumber(L, MSG_task_get_compute_duration(tk));
-  return 1;
-}
-
-static int Task_execute(lua_State * L)
-{
-  m_task_t tk = checkTask(L, -1);
-  int res = MSG_task_execute(tk);
-  lua_pushnumber(L, res);
-  return 1;
-}
-
-static int Task_destroy(lua_State * L)
-{
-  m_task_t tk = checkTask(L, -1);
-  int res = MSG_task_destroy(tk);
-  lua_pushnumber(L, res);
-  return 1;
-}
-
-static int Task_send(lua_State * L)
-{
-  //stackDump("send ",L);
-  m_task_t tk = checkTask(L, -2);
-  const char *mailbox = luaL_checkstring(L, -1);
-  lua_pop(L, 1);                // remove the string so that the task is on top of it
-  MSG_task_set_data(tk, L);     // Copy my stack into the task, so that the receiver can copy the lua task directly
-  MSG_error_t res = MSG_task_send(tk, mailbox);
-  while (MSG_task_get_data(tk) != NULL) // Don't mess up with my stack: the receiver didn't copy the data yet
-    MSG_process_sleep(0);       // yield
-
-  if (res != MSG_OK)
-    switch (res) {
-    case MSG_TIMEOUT:
-      XBT_ERROR("MSG_task_send failed : Timeout");
-      break;
-    case MSG_TRANSFER_FAILURE:
-      XBT_ERROR("MSG_task_send failed : Transfer Failure");
-      break;
-    case MSG_HOST_FAILURE:
-      XBT_ERROR("MSG_task_send failed : Host Failure ");
-      break;
-    default:
-      XBT_ERROR
-          ("MSG_task_send failed : Unexpected error , please report this bug");
-      break;
-    }
+  const char* file = luaL_checkstring(L, 1);
+  XBT_DEBUG("Loading environment file %s", file);
+  MSG_create_environment(file);
   return 0;
 }
 
-static int Task_recv(lua_State * L)
-{
-  m_task_t tk = NULL;
-  const char *mailbox = luaL_checkstring(L, -1);
-  MSG_error_t res = MSG_task_receive(&tk, mailbox);
-
-  lua_State *sender_stack = MSG_task_get_data(tk);
-  lua_xmove(sender_stack, L, 1);        // copy the data directly from sender's stack
-  MSG_task_set_data(tk, NULL);
-
-  if (res != MSG_OK)
-    switch (res) {
-    case MSG_TIMEOUT:
-      XBT_ERROR("MSG_task_receive failed : Timeout");
-      break;
-    case MSG_TRANSFER_FAILURE:
-      XBT_ERROR("MSG_task_receive failed : Transfer Failure");
-      break;
-    case MSG_HOST_FAILURE:
-      XBT_ERROR("MSG_task_receive failed : Host Failure ");
-      break;
-    default:
-      XBT_ERROR
-          ("MSG_task_receive failed : Unexpected error , please report this bug");
-      break;
-    }
-
-  return 1;
-}
-
-static const luaL_reg Task_methods[] = {
-  {"new", Task_new},
-  {"name", Task_get_name},
-  {"computation_duration", Task_computation_duration},
-  {"execute", Task_execute},
-  {"destroy", Task_destroy},
-  {"send", Task_send},
-  {"recv", Task_recv},
-  {0, 0}
-};
+/**
+ * \brief Prints a log string with debug level.
+ * \param L a Lua state
+ * \return number of values returned to Lua
+ *
+ * - Argument 1 (string): the text to print
+ */
+static int debug(lua_State* L) {
 
-static int Task_gc(lua_State * L)
-{
-  m_task_t tk = checkTask(L, -1);
-  if (tk)
-    MSG_task_destroy(tk);
+  const char* str = luaL_checkstring(L, 1);
+  XBT_DEBUG("%s", str);
   return 0;
 }
 
-static int Task_tostring(lua_State * L)
-{
-  lua_pushfstring(L, "Task :%p", lua_touserdata(L, 1));
-  return 1;
-}
-
-static const luaL_reg Task_meta[] = {
-  {"__gc", Task_gc},
-  {"__tostring", Task_tostring},
-  {0, 0}
-};
-
 /**
- * Host
+ * \brief Prints a log string with info level.
+ * \param L a Lua state
+ * \return number of values returned to Lua
+ *
+ * - Argument 1 (string): the text to print
  */
-static m_host_t checkHost(lua_State * L, int index)
-{
-  m_host_t *pi, ht;
-  luaL_checktype(L, index, LUA_TTABLE);
-  lua_getfield(L, index, "__simgrid_host");
-  pi = (m_host_t *) luaL_checkudata(L, -1, HOST_MODULE_NAME);
-  if (pi == NULL)
-    luaL_typerror(L, index, HOST_MODULE_NAME);
-  ht = *pi;
-  if (!ht)
-    luaL_error(L, "null Host");
-  lua_pop(L, 1);
-  return ht;
-}
-
-static int Host_get_by_name(lua_State * L)
-{
-  const char *name = luaL_checkstring(L, 1);
-  XBT_DEBUG("Getting Host from name...");
-  m_host_t msg_host = MSG_get_host_by_name(name);
-  if (!msg_host) {
-    luaL_error(L, "null Host : MSG_get_host_by_name failled");
-  }
-  lua_newtable(L);              /* create a table, put the userdata on top of it */
-  m_host_t *lua_host = (m_host_t *) lua_newuserdata(L, sizeof(m_host_t));
-  *lua_host = msg_host;
-  luaL_getmetatable(L, HOST_MODULE_NAME);
-  lua_setmetatable(L, -2);
-  lua_setfield(L, -2, "__simgrid_host");        /* put the userdata as field of the table */
-  /* remove the args from the stack */
-  lua_remove(L, 1);
-  return 1;
-}
-
-
-static int Host_get_name(lua_State * L)
-{
-  m_host_t ht = checkHost(L, -1);
-  lua_pushstring(L, MSG_host_get_name(ht));
-  return 1;
-}
-
-static int Host_number(lua_State * L)
-{
-  lua_pushnumber(L, MSG_get_host_number());
-  return 1;
-}
-
-static int Host_at(lua_State * L)
-{
-  int index = luaL_checkinteger(L, 1);
-  m_host_t host = MSG_get_host_table()[index - 1];      // lua indexing start by 1 (lua[1] <=> C[0])
-  lua_newtable(L);              /* create a table, put the userdata on top of it */
-  m_host_t *lua_host = (m_host_t *) lua_newuserdata(L, sizeof(m_host_t));
-  *lua_host = host;
-  luaL_getmetatable(L, HOST_MODULE_NAME);
-  lua_setmetatable(L, -2);
-  lua_setfield(L, -2, "__simgrid_host");        /* put the userdata as field of the table */
-  return 1;
-
-}
-
-static int Host_self(lua_State * L)
-{
-	m_host_t host = MSG_host_self();
-	lua_newtable(L);
-	m_host_t *lua_host =(m_host_t *)lua_newuserdata(L,sizeof(m_host_t));
-	*lua_host = host;
-	luaL_getmetatable(L, HOST_MODULE_NAME);
-	lua_setmetatable(L, -2);
-	lua_setfield(L, -2, "__simgrid_host");
-	return 1;
-
-}
-
-static int Host_get_property_value(lua_State * L)
-{
-	m_host_t ht = checkHost(L, -2);
-	const char *prop = luaL_checkstring(L, -1);
-	lua_pushstring(L,MSG_host_get_property_value(ht,prop));
-	return 1;
-}
-
-/* ********************************************************************************* */
-/*                           lua_stub_generator functions                            */
-/* ********************************************************************************* */
-
-xbt_dict_t process_function_set;
-xbt_dynar_t process_list;
-xbt_dict_t machine_set;
-static s_process_t process;
-
-void s_process_free(void *process)
-{
-  s_process_t *p = (s_process_t *) process;
-  int i;
-  for (i = 0; i < p->argc; i++)
-    free(p->argv[i]);
-  free(p->argv);
-  free(p->host);
-}
-
-static int gras_add_process_function(lua_State * L)
-{
-  const char *arg;
-  const char *process_host = luaL_checkstring(L, 1);
-  const char *process_function = luaL_checkstring(L, 2);
-
-  if (xbt_dict_is_empty(machine_set)
-      || xbt_dict_is_empty(process_function_set)
-      || xbt_dynar_is_empty(process_list)) {
-    process_function_set = xbt_dict_new();
-    process_list = xbt_dynar_new(sizeof(s_process_t), s_process_free);
-    machine_set = xbt_dict_new();
-  }
-
-  xbt_dict_set(machine_set, process_host, NULL, NULL);
-  xbt_dict_set(process_function_set, process_function, NULL, NULL);
-
-  process.argc = 1;
-  process.argv = xbt_new(char *, 1);
-  process.argv[0] = xbt_strdup(process_function);
-  process.host = strdup(process_host);
-
-  lua_pushnil(L);
-  while (lua_next(L, 3) != 0) {
-    arg = lua_tostring(L, -1);
-    process.argc++;
-    process.argv =
-        xbt_realloc(process.argv, (process.argc) * sizeof(char *));
-    process.argv[(process.argc) - 1] = xbt_strdup(arg);
-
-    XBT_DEBUG("index = %f , arg = %s \n", lua_tonumber(L, -2),
-           lua_tostring(L, -1));
-    lua_pop(L, 1);
-  }
-  lua_pop(L, 1);
-  //add to the process list
-  xbt_dynar_push(process_list, &process);
+static int info(lua_State* L) {
 
+  const char* str = luaL_checkstring(L, 1);
+  XBT_INFO("%s", str);
   return 0;
-
 }
 
+/**
+ * \brief Runs your application.
+ * \param L a Lua state
+ * \return number of values returned to Lua
+ */
+static int run(lua_State*  L) {
 
-static int gras_generate(lua_State * L)
-{
-  const char *project_name = luaL_checkstring(L, 1);
-  generate_sim(project_name);
-  generate_rl(project_name);
-  generate_makefile_local(project_name);
+  MSG_main();
   return 0;
 }
 
-/***********************************
- * 	Tracing
- **********************************/
-static int trace_start(lua_State *L)
-{
-#ifdef HAVE_TRACING
-  TRACE_start();
-#endif
-  return 1;
-}
-
-static int trace_category(lua_State * L)
-{
-#ifdef HAVE_TRACING
-  TRACE_category(luaL_checkstring(L, 1));
-#endif
-  return 1;
-}
-
-static int trace_set_task_category(lua_State *L)
-{
-#ifdef HAVE_TRACING
-  TRACE_msg_set_task_category(checkTask(L, -2), luaL_checkstring(L, -1));
-#endif
-  return 1;
-}
-
-static int trace_end(lua_State *L)
-{
-#ifdef HAVE_TRACING
-  TRACE_end();
-#endif
-  return 1;
-}
-//***********Register Methods *******************************************//
-/*
- * Host Methods
+/**
+ * \brief Returns the current simulated time.
+ * \param L a Lua state
+ * \return number of values returned to Lua
+ *
+ * - Return value (number): the simulated time
  */
-static const luaL_reg Host_methods[] = {
-  {"getByName", Host_get_by_name},
-  {"name", Host_get_name},
-  {"number", Host_number},
-  {"at", Host_at},
-  {"self",Host_self},
-  {"getPropValue",Host_get_property_value},
-  // Bypass XML Methods
-  {"setFunction", console_set_function},
-  {0, 0}
-};
+static int get_clock(lua_State* L) {
 
-static int Host_gc(lua_State * L)
-{
-  m_host_t ht = checkHost(L, -1);
-  if (ht)
-    ht = NULL;
-  return 0;
-}
-
-static int Host_tostring(lua_State * L)
-{
-  lua_pushfstring(L, "Host :%p", lua_touserdata(L, 1));
+  lua_pushnumber(L, MSG_get_clock());
   return 1;
 }
 
-static const luaL_reg Host_meta[] = {
-  {"__gc", Host_gc},
-  {"__tostring", Host_tostring},
-  {0, 0}
-};
-
-/*
- * AS Methods
- */
-static const luaL_reg AS_methods[] = {
-  {"new", console_add_AS},
-  {"addHost",console_add_host},
-  {"addLink",console_add_link},
-  {"addRoute",console_add_route},
-  {0, 0}
-};
-
 /**
- * Tracing Functions
+ * \brief Cleans the simulation.
+ * \param L a Lua state
+ * \return number of values returned to Lua
  */
-static const luaL_reg Trace_methods[] = {
-		{"start",trace_start},
-		{"category",trace_category},
-		{"setTaskCategory",trace_set_task_category},
-		{"finish",trace_end},
-		{0,0}
-};
-/*
- * Environment related
- */
-
-//extern lua_State *simgrid_lua_state;
-
-static int run_lua_code(int argc, char **argv)
-{
-  XBT_DEBUG("Run lua code %s", argv[0]);
-  lua_State *L = lua_newthread(simgrid_lua_state);
-  int ref = luaL_ref(simgrid_lua_state, LUA_REGISTRYINDEX);     // protect the thread from being garbage collected
-  int res = 1;
-
-  /* Start the co-routine */
-  lua_getglobal(L, argv[0]);
-  xbt_assert(lua_isfunction(L, -1),
-              "The lua function %s does not seem to exist", argv[0]);
-
-  // push arguments onto the stack
-  int i;
-  for (i = 1; i < argc; i++)
-    lua_pushstring(L, argv[i]);
-
-  // Call the function (in resume)
-  int err;
-  err = lua_pcall(L, argc - 1, 1, 0);
-  xbt_assert(err == 0, "error running function `%s': %s", argv[0],
-              lua_tostring(L, -1));
-
-  /* retrieve result */
-  if (lua_isnumber(L, -1)) {
-    res = lua_tonumber(L, -1);
-    lua_pop(L, 1);              /* pop returned value */
-  }
-  // cleanups
-  luaL_unref(simgrid_lua_state, LUA_REGISTRYINDEX, ref);
-  XBT_DEBUG("Execution of lua code %s is over", (argv ? argv[0] : "(null)"));
-  return res;
-}
-
-static int launch_application(lua_State * L)
+static int simgrid_gc(lua_State * L)
 {
-  const char *file = luaL_checkstring(L, 1);
-  MSG_function_register_default(run_lua_code);
-  MSG_launch_application(file);
+  // There is no need to cleanup the C world anymore, as it gets cleaned at system process closing automatically
+  // Maybe at some point we'll want to reintroduce this, for example when encapsulating the simulation properly
+  //if (sglua_is_maestro(L)) {
+  //  MSG_clean();
+  //}
   return 0;
 }
 
-#include "simix/simix.h"        //FIXME: KILLME when debugging on simix internals become useless
-static int create_environment(lua_State * L)
-{
-  const char *file = luaL_checkstring(L, 1);
-  XBT_DEBUG("Loading environment file %s", file);
-  MSG_create_environment(file);
-
-/*
-  xbt_dict_t hosts = SIMIX_host_get_dict();
-  smx_host_t host;
-  xbt_dict_cursor_t c;
-  const char *name;
-
-  xbt_dict_foreach(hosts, c, name, host) {
-    XBT_DEBUG("We have an host %s", SIMIX_host_get_name(host));
-  }
-*/
-
-  return 0;
-}
-
-static int debug(lua_State * L)
-{
-  const char *str = luaL_checkstring(L, 1);
-  XBT_DEBUG("%s", str);
-  return 0;
-}
-
-static int info(lua_State * L)
-{
-  const char *str = luaL_checkstring(L, 1);
-  XBT_INFO("%s", str);
-  return 0;
-}
-
-static int run(lua_State * L)
-{
-  MSG_main();
-  return 0;
-}
-
-static int clean(lua_State * L)
-{
-  MSG_clean();
-  return 0;
-}
-
-/*
- * Bypass XML Parser (lua console)
- */
-
 /*
  * Register platform for MSG
  */
 static int msg_register_platform(lua_State * L)
 {
-  /* Tell Simgrid we dont wanna use its parser */
-  surf_parse = console_parse_platform;
+  /* Tell Simgrid we don't wanna use its parser */
+  //surf_parse = console_parse_platform;
   surf_parse_reset_callbacks();
-  surf_config_models_setup(NULL);
   MSG_create_environment(NULL);
   return 0;
 }
@@ -614,58 +139,32 @@ static int msg_register_platform(lua_State * L)
 /*
  * Register platform for Simdag
  */
-
 static int sd_register_platform(lua_State * L)
 {
-  surf_parse = console_parse_platform_wsL07;
+  //surf_parse = console_parse_platform_wsL07;
   surf_parse_reset_callbacks();
-  surf_config_models_setup(NULL);
   SD_create_environment(NULL);
   return 0;
 }
 
-/*
- * Register platform for gras
- */
-static int gras_register_platform(lua_State * L)
-{
-  /* Tell Simgrid we dont wanna use surf parser */
-  surf_parse = console_parse_platform;
-  surf_parse_reset_callbacks();
-  surf_config_models_setup(NULL);
-  gras_create_environment(NULL);
-  return 0;
-}
-
 /**
  * Register applicaiton for MSG
  */
 static int msg_register_application(lua_State * L)
 {
   MSG_function_register_default(run_lua_code);
-  surf_parse = console_parse_application;
+  //surf_parse = console_parse_application;
   MSG_launch_application(NULL);
   return 0;
 }
 
-/*
- * Register application for gras
- */
-static int gras_register_application(lua_State * L)
-{
-  gras_function_register_default(run_lua_code);
-  surf_parse = console_parse_application;
-  gras_launch_application(NULL);
-  return 0;
-}
-
-static const luaL_Reg simgrid_funcs[] = {
+static const luaL_Reg simgrid_functions[] = {
   {"create_environment", create_environment},
   {"launch_application", launch_application},
   {"debug", debug},
   {"info", info},
   {"run", run},
-  {"clean", clean},
+  {"get_clock", get_clock},
   /* short names */
   {"platform", create_environment},
   {"application", launch_application},
@@ -673,28 +172,32 @@ static const luaL_Reg simgrid_funcs[] = {
   {"msg_register_platform", msg_register_platform},
   {"sd_register_platform", sd_register_platform},
   {"msg_register_application", msg_register_application},
-  {"gras_register_platform", gras_register_platform},
-  {"gras_register_application", gras_register_application},
-  /* gras sub generator method */
-  {"gras_set_process_function", gras_add_process_function},
-  {"gras_generate", gras_generate},
   {NULL, NULL}
 };
 
 /* ********************************************************************************* */
-/*                       module management functions                                 */
+/*                           module management functions                             */
 /* ********************************************************************************* */
 
 #define LUA_MAX_ARGS_COUNT 10   /* maximum amount of arguments we can get from lua on command line */
-#define TEST
-int luaopen_simgrid(lua_State * L);     // Fuck gcc: we don't need that prototype
-int luaopen_simgrid(lua_State * L)
+
+/**
+ * \brief Opens the simgrid Lua module.
+ *
+ * This function is called automatically by the Lua interpreter when some
+ * Lua code requires the "simgrid" module.
+ *
+ * \param L the Lua state
+ */
+int luaopen_simgrid(lua_State *L)
 {
-  XBT_DEBUG("Luaopen_Simgrid *****");
-  char **argv = malloc(sizeof(char *) * LUA_MAX_ARGS_COUNT);
+  XBT_DEBUG("luaopen_simgrid *****");
+
+  /* Get the command line arguments from the lua interpreter */
+  char **argv = xbt_malloc(sizeof(char *) * LUA_MAX_ARGS_COUNT);
   int argc = 1;
   argv[0] = (char *) "/usr/bin/lua";    /* Lie on the argv[0] so that the stack dumping facilities find the right binary. FIXME: what if lua is not in that location? */
-  /* Get the command line arguments from the lua interpreter */
+
   lua_getglobal(L, "arg");
   /* if arg is a null value, it means we use lua only as a script to init platform
    * else it should be a table and then take arg in consideration
@@ -721,48 +224,138 @@ int luaopen_simgrid(lua_State * L)
     argv[argc--] = NULL;
 
     /* Initialize the MSG core */
-    MSG_global_init(&argc, argv);
+    MSG_init(&argc, argv);
+    MSG_process_set_data_cleanup((void_f_pvoid_t) lua_close);
     XBT_DEBUG("Still %d arguments on command line", argc); // FIXME: update the lua's arg table to reflect the changes from SimGrid
   }
+
+  /* Keep the context mechanism informed of our lua world today */
+  sglua_maestro_state = L;
+
+  /* initialize access to my tables by children Lua states */
+  lua_newtable(L);
+  lua_setfield(L, LUA_REGISTRYINDEX, "simgrid.maestro_tables");
+
+  sglua_register_c_functions(L);
+
+  return 1;
+}
+
+/**
+ * \brief Returns whether a Lua state is the maestro state.
+ * \param L a Lua state
+ * \return true if this is maestro
+ */
+int sglua_is_maestro(lua_State* L) {
+  return L == sglua_maestro_state;
+}
+
+/**
+ * \brief Returns the maestro state.
+ * \return the maestro Lua state
+ */
+lua_State* sglua_get_maestro(void) {
+  return sglua_maestro_state;
+}
+
+/**
+ * \brief Makes the core functions available to the Lua world.
+ * \param L a Lua world
+ */
+static void sglua_register_core_functions(lua_State *L)
+{
   /* register the core C functions to lua */
-  luaL_register(L, "simgrid", simgrid_funcs);
-  /* register the task methods to lua */
-  luaL_openlib(L, TASK_MODULE_NAME, Task_methods, 0);   //create methods table,add it to the globals
-  luaL_newmetatable(L, TASK_MODULE_NAME);       //create metatable for Task,add it to the Lua registry
-  luaL_openlib(L, 0, Task_meta, 0);     // fill metatable
-  lua_pushliteral(L, "__index");
-  lua_pushvalue(L, -3);         //dup methods table
-  lua_rawset(L, -3);            //matatable.__index = methods
-  lua_pushliteral(L, "__metatable");
-  lua_pushvalue(L, -3);         //dup methods table
-  lua_rawset(L, -3);            //hide metatable:metatable.__metatable = methods
-  lua_pop(L, 1);                //drop metatable
-
-  /* register the hosts methods to lua */
-  luaL_openlib(L, HOST_MODULE_NAME, Host_methods, 0);
-  luaL_newmetatable(L, HOST_MODULE_NAME);
-  luaL_openlib(L, 0, Host_meta, 0);
-  lua_pushliteral(L, "__index");
-  lua_pushvalue(L, -3);
-  lua_rawset(L, -3);
-  lua_pushliteral(L, "__metatable");
-  lua_pushvalue(L, -3);
-  lua_rawset(L, -3);
+  luaL_register(L, "simgrid", simgrid_functions);
+                                  /* simgrid */
+
+  /* set a finalizer that cleans simgrid, by adding to the simgrid module a
+   * dummy userdata whose __gc metamethod calls MSG_clean() */
+  lua_newuserdata(L, sizeof(void*));
+                                  /* simgrid udata */
+  lua_newtable(L);
+                                  /* simgrid udata mt */
+  lua_pushcfunction(L, simgrid_gc);
+                                  /* simgrid udata mt simgrid_gc */
+  lua_setfield(L, -2, "__gc");
+                                  /* simgrid udata mt */
+  lua_setmetatable(L, -2);
+                                  /* simgrid udata */
+  lua_setfield(L, -2, "__simgrid_loaded");
+                                  /* simgrid */
   lua_pop(L, 1);
+                                  /* -- */
+}
 
-  /* register the links methods to lua */
-  luaL_openlib(L, AS_MODULE_NAME, AS_methods, 0);
-  luaL_newmetatable(L, AS_MODULE_NAME);
-  lua_pop(L, 1);
+/**
+ * \brief Creates the simgrid module and make it available to Lua.
+ * \param L a Lua world
+ */
+static void sglua_register_c_functions(lua_State *L)
+{
+  sglua_register_core_functions(L);
+  sglua_register_task_functions(L);
+  sglua_register_comm_functions(L);
+  sglua_register_host_functions(L);
+  sglua_register_process_functions(L);
+  sglua_register_platf_functions(L);
+}
 
+/**
+ * \brief Runs a Lua function as a new simulated process.
+ * \param argc number of arguments of the function
+ * \param argv name of the Lua function and array of its arguments
+ * \return result of the function
+ */
+static int run_lua_code(int argc, char **argv)
+{
+  XBT_DEBUG("Run lua code %s", argv[0]);
 
+  /* create a new state, getting globals from maestro */
+  lua_State *L = sglua_clone_maestro();
+  MSG_process_set_data(MSG_process_self(), L);
 
-  /*register the Tracing functions to lua */
-  luaL_openlib(L, TRACE_MODULE_NAME, Trace_methods, 0);
-  luaL_newmetatable(L, TRACE_MODULE_NAME);
-  lua_pop(L, 1);
+  /* start the function */
+  lua_getglobal(L, argv[0]);
+  xbt_assert(lua_isfunction(L, -1),
+              "There is no Lua function with name `%s'", argv[0]);
 
-  /* Keep the context mechanism informed of our lua world today */
-  simgrid_lua_state = L;
-  return 1;
+  /* push arguments onto the stack */
+  int i;
+  for (i = 1; i < argc; i++)
+    lua_pushstring(L, argv[i]);
+
+  /* call the function */
+  _XBT_GNUC_UNUSED int err;
+  err = lua_pcall(L, argc - 1, 1, 0);
+  xbt_assert(err == 0, "Error running function `%s': %s", argv[0],
+              lua_tostring(L, -1));
+
+  /* retrieve result */
+  int res = 1;
+  if (lua_isnumber(L, -1)) {
+    res = lua_tonumber(L, -1);
+    lua_pop(L, 1);              /* pop returned value */
+  }
+
+  XBT_DEBUG("Execution of Lua code %s is over", (argv ? argv[0] : "(null)"));
+
+  return res;
+}
+
+/**
+ * \brief Returns a string corresponding to an MSG error code.
+ * \param err an MSG error code
+ * \return a string describing this error
+ */
+const char* sglua_get_msg_error(msg_error_t err) {
+
+  static const char* msg_errors[] = {
+      NULL,
+      "timeout",
+      "transfer failure",
+      "host failure",
+      "task canceled"
+  };
+
+  return msg_errors[err];
 }