--- /dev/null
+/* $Id$ */
+
+/* context_lua - implementation of context switching with lua coroutines */
+
+/* Copyright (c) 2004-2008 the SimGrid team. All right 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 "private.h"
+#include "context_sysv_config.h" /* loads context system definitions */
+#include "portable.h"
+#include <lua5.1/lauxlib.h>
+#include <lua5.1/lualib.h>
+
+// FIXME: better location for that
+extern void MSG_register(lua_State *L);
+
+XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(smx_lua);
+
+typedef struct s_smx_ctx_sysv {
+ SMX_CTX_BASE_T;
+ lua_State *state;
+ int ref; /* to prevent the lua GC from collecting my threads, I ref them explicitely */
+ int nargs; /* argument to lua_resume. First time: argc-1, afterward: 0 */
+} s_smx_ctx_lua_t, *smx_ctx_lua_t;
+
+static lua_State *lua_state;
+
+static smx_context_t
+smx_ctx_lua_create_context(xbt_main_func_t code, int argc, char** argv,
+ void_f_pvoid_t cleanup_func, void* cleanup_arg);
+
+static int smx_ctx_lua_factory_finalize(smx_context_factory_t *factory);
+
+static void smx_ctx_lua_free(smx_context_t context);
+
+static void smx_ctx_lua_start(smx_context_t context);
+
+static void smx_ctx_lua_stop(smx_context_t context);
+
+static void smx_ctx_lua_suspend(smx_context_t context);
+
+static void
+ smx_ctx_lua_resume(smx_context_t old_context, smx_context_t new_context);
+
+static void smx_ctx_sysv_wrapper(void);
+
+void SIMIX_ctx_lua_factory_loadfile(const char *file) {
+ if (luaL_loadfile(lua_state, file) || lua_pcall(lua_state, 0, 0, 0))
+ THROW2(unknown_error,0,"error while parsing %s: %s", file, lua_tostring(lua_state, -1));
+ INFO1("File %s loaded",file);
+}
+void SIMIX_ctx_lua_factory_init(smx_context_factory_t *factory) {
+
+ *factory = xbt_new0(s_smx_context_factory_t, 1);
+
+ (*factory)->create_context = smx_ctx_lua_create_context;
+ (*factory)->finalize = smx_ctx_lua_factory_finalize;
+ (*factory)->free = smx_ctx_lua_free;
+ (*factory)->start = smx_ctx_lua_start;
+ (*factory)->stop = smx_ctx_lua_stop;
+ (*factory)->suspend = smx_ctx_lua_suspend;
+ (*factory)->resume = smx_ctx_lua_resume;
+ (*factory)->name = "smx_lua_context_factory";
+
+ lua_state = lua_open();
+ luaL_openlibs(lua_state);
+ MSG_register(lua_state);
+ INFO0("Lua Factory created");
+}
+
+static int smx_ctx_lua_factory_finalize(smx_context_factory_t * factory)
+{
+ lua_close(lua_state);
+
+ free(*factory);
+ *factory = NULL;
+ return 0;
+}
+
+static smx_context_t
+smx_ctx_lua_create_context(xbt_main_func_t code, int argc, char** argv,
+ void_f_pvoid_t cleanup_func, void* cleanup_arg)
+{
+ smx_ctx_lua_t context = xbt_new0(s_smx_ctx_lua_t, 1);
+
+ /* If the user provided a function for the process then use it
+ otherwise is the context for maestro */
+ if(code){
+ context->code = code;
+ context->state = lua_newthread(lua_state);
+
+ context->ref = luaL_ref(lua_state, LUA_REGISTRYINDEX);
+ //lua_pop(lua_state,1);
+
+ context->argc = argc;
+ context->argv = argv;
+ context->cleanup_func = cleanup_func;
+ context->cleanup_arg = cleanup_arg;
+ INFO1("Created context for function %s",argv[0]);
+ } else {
+ INFO0("Created context for maestro");
+ }
+
+ return (smx_context_t)context;
+}
+
+static void smx_ctx_lua_free(smx_context_t pcontext)
+{
+ int i;
+ smx_ctx_lua_t context = (smx_ctx_lua_t)pcontext;
+ if (context){
+
+ /* free argv */
+ if (context->argv) {
+ for (i = 0; i < context->argc; i++)
+ if (context->argv[i])
+ free(context->argv[i]);
+
+ free(context->argv);
+ }
+
+ /* destroy the context */
+ luaL_unref(lua_state,LUA_REGISTRYINDEX,context->ref );
+ free(context);
+ }
+}
+
+static void smx_ctx_lua_start(smx_context_t pcontext) {
+ smx_ctx_lua_t context = (smx_ctx_lua_t)pcontext;
+ INFO1("Starting '%s'",context->argv[0]);
+
+ lua_getglobal(context->state,context->argv[0]);
+ if(!lua_isfunction(context->state,-1)) {
+ lua_pop(context->state,1);
+ THROW1(arg_error,0,"The lua function %s does not seem to exist",context->argv[0]);
+ }
+
+ // push arguments onto the stack
+ int i;
+ for(i=1;i<context->argc;i++)
+ lua_pushstring(context->state,context->argv[i]);
+
+ // Call the function
+ context->nargs = context->argc-1;
+}
+
+static void smx_ctx_lua_stop(smx_context_t pcontext) {
+ smx_ctx_lua_t context = (smx_ctx_lua_t)pcontext;
+
+ if (context->cleanup_func)
+ (*context->cleanup_func) (context->cleanup_arg);
+
+ // FIXME: DO it
+}
+
+
+static void smx_ctx_lua_suspend(smx_context_t context)
+{
+ INFO1("Suspending %s",context->argv[0]);
+ lua_yield(((smx_ctx_lua_t)context)->state,0); // Should be the last line of the function
+// INFO1("Suspended %s",context->argv[0]);
+}
+
+static void
+smx_ctx_lua_resume(smx_context_t old_context, smx_context_t new_context) {
+ smx_ctx_lua_t context = (smx_ctx_lua_t)new_context;
+
+ INFO1("Resuming %s",context->argv[0]);
+ lua_resume(context->state,context->nargs);
+ context->nargs = 0;
+ INFO1("Resumed %s",context->argv[0]);
+
+// INFO1("Process %s done ?",context->argv[0]);
+// lua_resume(((smx_ctx_lua_t)new_context)->state,0);
+}
