X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/6807a2447d77330892cdf320b4bec2558b83f3c6..9c13b98a571f44f7f2faf7193a60ce7e94a82094:/src/bindings/lua/simgrid_lua.c

diff --git a/src/bindings/lua/simgrid_lua.c b/src/bindings/lua/simgrid_lua.c
index 5464bbf53f..5fdd7c1618 100644
--- a/src/bindings/lua/simgrid_lua.c
+++ b/src/bindings/lua/simgrid_lua.c
@@ -1,77 +1,66 @@
-/* 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. */
+
+/* SimGrid Lua bindings                                                     */
+
 #include "simgrid_lua.h"
+#include "lua_state_cloner.h"
+#include "lua_utils.h"
+
+XBT_LOG_NEW_DEFAULT_CATEGORY(lua, "Lua Bindings");
 
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(lua, bindings, "Lua Bindings");
+static lua_State *lua_maestro_state;
 
 #define TASK_MODULE_NAME "simgrid.Task"
 #define HOST_MODULE_NAME "simgrid.Host"
-// Surf ( bypass XML )
+// 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) {
+static void register_c_functions(lua_State *L);
 
-    case LUA_TSTRING:          /* strings */
-      p += sprintf(p, "`%s'", lua_tostring(L, i));
-      break;
+static void *my_checkudata (lua_State *L, int ud, const char *tname) {
 
-    case LUA_TBOOLEAN:         /* booleans */
-      p += sprintf(p, lua_toboolean(L, i) ? "true" : "false");
-      break;
+  XBT_DEBUG("Checking the task: ud = %d", ud);
+  sglua_stack_dump("my_checkudata: ", L);
+  void *p = lua_touserdata(L, ud);
+  lua_getfield(L, LUA_REGISTRYINDEX, tname);
+  const void* correct_mt = lua_topointer(L, -1);
 
-    case LUA_TNUMBER:          /* numbers */
-      p += sprintf(p, "%g", lua_tonumber(L, i));
-      break;
+  int has_mt = lua_getmetatable(L, ud);
+  XBT_DEBUG("Checking the task: has metatable ? %d", has_mt);
+  const void* actual_mt = NULL;
+  if (has_mt) { actual_mt = lua_topointer(L, -1); lua_pop(L, 1); }
+  XBT_DEBUG("Checking the task's metatable: expected %p, found %p", correct_mt, actual_mt);
+  sglua_stack_dump("my_checkudata: ", L);
 
-    case LUA_TTABLE:
-      p += sprintf(p, "Table");
-      break;
-
-    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;
-
-    }
-    p += sprintf(p, "  ");      /* put a separator */
-  }
-  INFO2("%s%s", msg, buff);
+  if (p == NULL || !lua_getmetatable(L, ud) || !lua_rawequal(L, -1, -2))
+    luaL_typerror(L, ud, tname);
+  lua_pop(L, 2);
+  return p;
 }
 
-/** @brief ensures that a userdata on the stack is a task and returns the pointer inside the userdata */
+/**
+ * @brief Ensures that a userdata on the stack is a task
+ * and returns the pointer inside the userdata.
+ * @param L a Lua state
+ * @param index an index in the Lua stack
+ * @return the task at this index
+ */
 static m_task_t checkTask(lua_State * L, int index)
 {
   m_task_t *pi, tk;
+  XBT_DEBUG("Lua task: %s", sglua_tostring(L, index));
   luaL_checktype(L, index, LUA_TTABLE);
   lua_getfield(L, index, "__simgrid_task");
-  pi = (m_task_t *) luaL_checkudata(L, -1, TASK_MODULE_NAME);
+
+  pi = (m_task_t *) luaL_checkudata(L, lua_gettop(L), TASK_MODULE_NAME);
+
   if (pi == NULL)
     luaL_typerror(L, index, TASK_MODULE_NAME);
   tk = *pi;
@@ -94,8 +83,9 @@ static m_task_t checkTask(lua_State * L, int index)
 /* *              * *
  * * Constructors * *
  * *              * */
+
 /**
- * Construct an new task with the specified processing amount and amount
+ * @brief Constructs a new task with the specified processing amount and amount
  * of data needed.
  *
  * @param name	Task's name
@@ -110,6 +100,7 @@ static m_task_t checkTask(lua_State * L, int index)
  */
 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);
@@ -159,9 +150,9 @@ static int Task_destroy(lua_State * L)
 
 static int Task_send(lua_State * L)
 {
-  //stackDump("send ",L);
-  m_task_t tk = checkTask(L, -2);
-  const char *mailbox = luaL_checkstring(L, -1);
+  //stack_dump("send ", L);
+  m_task_t tk = checkTask(L, 1);
+  const char *mailbox = luaL_checkstring(L, 2);
   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);
@@ -171,52 +162,60 @@ static int Task_send(lua_State * L)
   if (res != MSG_OK)
     switch (res) {
     case MSG_TIMEOUT:
-      ERROR0("MSG_task_send failed : Timeout");
+      XBT_DEBUG("MSG_task_send failed : Timeout");
       break;
     case MSG_TRANSFER_FAILURE:
-      ERROR0("MSG_task_send failed : Transfer Failure");
+      XBT_DEBUG("MSG_task_send failed : Transfer Failure");
       break;
     case MSG_HOST_FAILURE:
-      ERROR0("MSG_task_send failed : Host Failure ");
+      XBT_DEBUG("MSG_task_send failed : Host Failure ");
       break;
     default:
-      ERROR0
+      XBT_ERROR
           ("MSG_task_send failed : Unexpected error , please report this bug");
       break;
     }
   return 0;
 }
 
-static int Task_recv(lua_State * L)
+static int Task_recv_with_timeout(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)
+  const char *mailbox = luaL_checkstring(L, -2);
+  int timeout = luaL_checknumber(L, -1);
+  MSG_error_t res = MSG_task_receive_with_timeout(&tk, mailbox, timeout);
+
+  if (res == MSG_OK) {
+    lua_State *sender_stack = MSG_task_get_data(tk);
+    sglua_move_value(sender_stack, L);        // copy the data directly from sender's stack
+    MSG_task_set_data(tk, NULL);
+  }
+  else {
     switch (res) {
     case MSG_TIMEOUT:
-      ERROR0("MSG_task_receive failed : Timeout");
+      XBT_DEBUG("MSG_task_receive failed : Timeout");
       break;
     case MSG_TRANSFER_FAILURE:
-      ERROR0("MSG_task_receive failed : Transfer Failure");
+      XBT_DEBUG("MSG_task_receive failed : Transfer Failure");
       break;
     case MSG_HOST_FAILURE:
-      ERROR0("MSG_task_receive failed : Host Failure ");
+      XBT_DEBUG("MSG_task_receive failed : Host Failure ");
       break;
     default:
-      ERROR0
-          ("MSG_task_receive failed : Unexpected error , please report this bug");
+      XBT_ERROR("MSG_task_receive failed : Unexpected error , please report this bug");
       break;
     }
-
+    lua_pushnil(L);
+  }
   return 1;
 }
 
+static int Task_recv(lua_State * L)
+{
+  lua_pushnumber(L, -1.0);
+  return Task_recv_with_timeout(L);
+}
+
 static const luaL_reg Task_methods[] = {
   {"new", Task_new},
   {"name", Task_get_name},
@@ -225,7 +224,8 @@ static const luaL_reg Task_methods[] = {
   {"destroy", Task_destroy},
   {"send", Task_send},
   {"recv", Task_recv},
-  {0, 0}
+  {"recv_timeout", Task_recv_with_timeout},
+  {NULL, NULL}
 };
 
 static int Task_gc(lua_State * L)
@@ -245,7 +245,7 @@ static int Task_tostring(lua_State * L)
 static const luaL_reg Task_meta[] = {
   {"__gc", Task_gc},
   {"__tostring", Task_tostring},
-  {0, 0}
+  {NULL, NULL}
 };
 
 /**
@@ -256,7 +256,7 @@ 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);
+  pi = (m_host_t *) luaL_checkudata(L, lua_gettop(L), HOST_MODULE_NAME);
   if (pi == NULL)
     luaL_typerror(L, index, HOST_MODULE_NAME);
   ht = *pi;
@@ -269,10 +269,10 @@ static m_host_t checkHost(lua_State * L, int index)
 static int Host_get_by_name(lua_State * L)
 {
   const char *name = luaL_checkstring(L, 1);
-  DEBUG0("Getting Host from name...");
+  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");
+    luaL_error(L, "null Host : MSG_get_host_by_name failed");
   }
   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));
@@ -285,7 +285,6 @@ static int Host_get_by_name(lua_State * L)
   return 1;
 }
 
-
 static int Host_get_name(lua_State * L)
 {
   m_host_t ht = checkHost(L, -1);
@@ -315,23 +314,36 @@ static int Host_at(lua_State * L)
 
 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;
-
+  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;
+  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;
+}
+
+static int Host_sleep(lua_State *L)
+{
+  int time = luaL_checknumber(L, -1);
+  MSG_process_sleep(time);
+  return 1;
+}
+
+static int Host_destroy(lua_State *L)
+{
+  m_host_t ht = checkHost(L, -1);
+  __MSG_host_destroy(ht);
+  return 1;
 }
 
 /* ********************************************************************************* */
@@ -383,16 +395,14 @@ static int gras_add_process_function(lua_State * L)
         xbt_realloc(process.argv, (process.argc) * sizeof(char *));
     process.argv[(process.argc) - 1] = xbt_strdup(arg);
 
-    DEBUG2("index = %f , arg = %s \n", lua_tonumber(L, -2),
+    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);
-
   return 0;
-
 }
 
 
@@ -410,34 +420,38 @@ static int gras_generate(lua_State * L)
  **********************************/
 static int trace_start(lua_State *L)
 {
+#ifdef HAVE_TRACING
   TRACE_start();
+#endif
   return 1;
 }
 
 static int trace_category(lua_State * L)
 {
-  /* _XBT_GNUC_UNUSED to pass compilation in paranoid mode without tracing
-   * support, where TRACE_category(x) is preprocessed to nothing. */
-  const char *category _XBT_GNUC_UNUSED = luaL_checkstring(L, 1);
-  TRACE_category(category);
+#ifdef HAVE_TRACING
+  TRACE_category(luaL_checkstring(L, 1));
+#endif
   return 1;
 }
 
 static int trace_set_task_category(lua_State *L)
 {
-  /* _XBT_GNUC_UNUSED as above */
-  m_task_t tk _XBT_GNUC_UNUSED = checkTask(L, -2);
-  const char *category _XBT_GNUC_UNUSED = luaL_checkstring(L, -1);
-  TRACE_msg_set_task_category(tk, category);
+#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 *******************************************//
+
+// *********** Register Methods ******************************************* //
+
 /*
  * Host Methods
  */
@@ -446,12 +460,14 @@ static const luaL_reg Host_methods[] = {
   {"name", Host_get_name},
   {"number", Host_number},
   {"at", Host_at},
-  {"self",Host_self},
-  {"getPropValue",Host_get_property_value},
+  {"self", Host_self},
+  {"getPropValue", Host_get_property_value},
+  {"sleep", Host_sleep},
+  {"destroy", Host_destroy},
   // Bypass XML Methods
-  {"new", console_add_host},
   {"setFunction", console_set_function},
-  {0, 0}
+  {"setProperty", console_host_set_property},
+  {NULL, NULL}
 };
 
 static int Host_gc(lua_State * L)
@@ -479,72 +495,64 @@ static const luaL_reg Host_meta[] = {
  */
 static const luaL_reg AS_methods[] = {
   {"new", console_add_AS},
-  {0, 0}
-};
-
-
-/*
- * Link Methods
- */
-static const luaL_reg Link_methods[] = {
-  {"new", console_add_link},
-  {0, 0}
-};
-
-/*
- * Route Methods
- */
-static const luaL_reg Route_methods[] = {
-  {"new", console_add_route},
-  {0, 0}
+  {"addHost", console_add_host},
+  {"addLink", console_add_link},
+  {"addRoute", console_add_route},
+  {NULL, NULL}
 };
 
 /**
  * Tracing Functions
  */
 static const luaL_reg Trace_methods[] = {
-		{"start",trace_start},
-		{"category",trace_category},
-		{"setTaskCategory",trace_set_task_category},
-		{"finish",trace_end},
-		{0,0}
+  {"start", trace_start},
+  {"category", trace_category},
+  {"setTaskCategory", trace_set_task_category},
+  {"finish", trace_end},
+  {NULL, NULL}
 };
+
 /*
  * Environment related
  */
 
-extern lua_State *simgrid_lua_state;
-
+/**
+ * @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)
 {
-  DEBUG1("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
+  XBT_DEBUG("Run lua code %s", argv[0]);
+
+  lua_State *L = sglua_clone_maestro();
   int res = 1;
 
-  /* Start the co-routine */
+  /* start the function */
   lua_getglobal(L, argv[0]);
-  xbt_assert1(lua_isfunction(L, -1),
+  xbt_assert(lua_isfunction(L, -1),
               "The lua function %s does not seem to exist", argv[0]);
 
-  // push arguments onto the stack
+  /* push arguments onto the stack */
   int i;
   for (i = 1; i < argc; i++)
     lua_pushstring(L, argv[i]);
 
-  // Call the function (in resume)
-  xbt_assert2(lua_pcall(L, argc - 1, 1, 0) == 0,
-              "error running function `%s': %s", argv[0], lua_tostring(L,
-                                                                       -1));
+  /* call the function */
+  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);
-  DEBUG1("Execution of lua code %s is over", (argv ? argv[0] : "(null)"));
+
+  XBT_DEBUG("Execution of Lua code %s is over", (argv ? argv[0] : "(null)"));
+
   return res;
 }
 
@@ -556,32 +564,25 @@ static int launch_application(lua_State * L)
   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);
-  DEBUG1("Loading environment file %s", file);
+  XBT_DEBUG("Loading environment file %s", file);
   MSG_create_environment(file);
-  smx_host_t *hosts = SIMIX_host_get_table();
-  int i;
-  for (i = 0; i < SIMIX_host_get_number(); i++) {
-    DEBUG1("We have an host %s", SIMIX_host_get_name(hosts[i]));
-  }
-
   return 0;
 }
 
 static int debug(lua_State * L)
 {
   const char *str = luaL_checkstring(L, 1);
-  DEBUG1("%s", str);
+  XBT_DEBUG("%s", str);
   return 0;
 }
 
 static int info(lua_State * L)
 {
   const char *str = luaL_checkstring(L, 1);
-  INFO1("%s", str);
+  XBT_INFO("%s", str);
   return 0;
 }
 
@@ -608,6 +609,8 @@ static int msg_register_platform(lua_State * L)
 {
   /* Tell Simgrid we dont wanna use its parser */
   surf_parse = console_parse_platform;
+  surf_parse_reset_callbacks();
+  surf_config_models_setup(NULL);
   MSG_create_environment(NULL);
   return 0;
 }
@@ -619,6 +622,8 @@ static int msg_register_platform(lua_State * L)
 static int sd_register_platform(lua_State * L)
 {
   surf_parse = console_parse_platform_wsL07;
+  surf_parse_reset_callbacks();
+  surf_config_models_setup(NULL);
   SD_create_environment(NULL);
   return 0;
 }
@@ -630,6 +635,8 @@ 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;
 }
@@ -682,19 +689,24 @@ static const luaL_Reg simgrid_funcs[] = {
 /*                       module management functions                                 */
 /* ********************************************************************************* */
 
-extern const char *xbt_ctx_factory_to_use;      /*Hack: let msg load directly the right factory */
-
 #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)
+
+int luaopen_simgrid(lua_State *L);     // Fuck gcc: we don't need that prototype
+
+/**
+ * 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 *****");
 
-  //xbt_ctx_factory_to_use = "lua";
+  /* Get the command line arguments from the lua interpreter */
   char **argv = 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
@@ -708,35 +720,72 @@ int luaopen_simgrid(lua_State * L)
       if (lua_isnil(L, -1)) {
         done = 1;
       } else {
-        xbt_assert1(lua_isstring(L, -1),
+        xbt_assert(lua_isstring(L, -1),
                     "argv[%d] got from lua is no string", argc - 1);
-        xbt_assert2(argc < LUA_MAX_ARGS_COUNT,
+        xbt_assert(argc < LUA_MAX_ARGS_COUNT,
                     "Too many arguments, please increase LUA_MAX_ARGS_COUNT in %s before recompiling SimGrid if you insist on having more than %d args on command line",
                     __FILE__, LUA_MAX_ARGS_COUNT - 1);
         argv[argc - 1] = (char *) luaL_checkstring(L, -1);
         lua_pop(L, 1);
-        DEBUG1("Got command line argument %s from lua", argv[argc - 1]);
+        XBT_DEBUG("Got command line argument %s from lua", argv[argc - 1]);
       }
     }
     argv[argc--] = NULL;
 
     /* Initialize the MSG core */
     MSG_global_init(&argc, argv);
-    DEBUG1("Still %d arguments on command line", argc); // FIXME: update the lua's arg table to reflect the changes from SimGrid
+    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 */
+  lua_maestro_state = L;
+
+  /* initialize access to my tables by children Lua states */
+  lua_newtable(L);
+  lua_setfield(L, LUA_REGISTRYINDEX, "simgrid.maestro_tables");
+
+  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 == lua_maestro_state;
+}
+
+/**
+ * @brief Returns the maestro state.
+ * @return true the maestro Lua state
+ */
+lua_State* sglua_get_maestro(void) {
+  return lua_maestro_state;
+}
+
+/**
+ * Makes the appropriate Simgrid functions available to the Lua world.
+ * @param L a Lua world
+ */
+void register_c_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, 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_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
+  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);
@@ -755,22 +804,8 @@ int luaopen_simgrid(lua_State * L)
   luaL_newmetatable(L, AS_MODULE_NAME);
   lua_pop(L, 1);
 
-  /* register the links methods to lua */
-  luaL_openlib(L, LINK_MODULE_NAME, Link_methods, 0);
-  luaL_newmetatable(L, LINK_MODULE_NAME);
-  lua_pop(L, 1);
-
-  /*register the routes methods to lua */
-  luaL_openlib(L, ROUTE_MODULE_NAME, Route_methods, 0);
-  luaL_newmetatable(L, ROUTE_MODULE_NAME);
-  lua_pop(L, 1);
-
-  /*register the Tracing functions to lua */
+  /* 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);
-
-  /* Keep the context mechanism informed of our lua world today */
-  simgrid_lua_state = L;
-  return 1;
 }