1 /* a fast and simple context switching library */
3 /* Copyright (c) 2004-2008 the SimGrid team. */
4 /* All rights reserved. */
6 /* This program is free software; you can redistribute it and/or modify it
7 * under the terms of the license (GNU LGPL) which comes with this package. */
15 #include <lua5.1/lauxlib.h>
19 void SIMIX_ctx_ruby_factory_init(smx_context_factory_t *factory);
22 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix, "Context switching mecanism");
24 const char *xbt_ctx_factory_to_use = NULL;
27 * This function is call by SIMIX_global_init() to initialize the context module.
30 void SIMIX_context_mod_init(void)
32 if (!simix_global->context_factory) {
33 /* select context factory to use to create the context(depends of the macro definitions) */
34 if (xbt_ctx_factory_to_use) {
35 SIMIX_context_select_factory(xbt_ctx_factory_to_use);
37 #ifdef CONTEXT_THREADS
38 /* context switch based os thread */
39 SIMIX_ctx_thread_factory_init(&simix_global->context_factory);
41 /* context switch based ucontext */
42 SIMIX_ctx_sysv_factory_init(&simix_global->context_factory);
44 /* context switch is not allowed on Windows */
45 #error ERROR [__FILE__, line __LINE__]: no context based implementation specified.
52 * This function is call by SIMIX_clean() to finalize the context module.
54 void SIMIX_context_mod_exit(void)
56 if (simix_global->context_factory) {
57 smx_pfn_context_factory_finalize_t finalize_factory;
59 /* finalize the context factory */
60 finalize_factory = simix_global->context_factory->finalize;
61 (*finalize_factory) (&simix_global->context_factory);
66 * This function is used to change the context factory.
67 * Warning: it destroy all the existing processes (even for maestro), and it
68 * will create a new maestro process using the new context factory.
70 int SIMIX_context_select_factory(const char *name)
72 /* if a context factory is already instantiated and it is different from the
73 newly selected one, then kill all the processes, exit the context module
74 and initialize the new factory.
78 if (simix_global->context_factory != NULL) {
79 if (strcmp(simix_global->context_factory->name, name)){
81 SIMIX_process_killall();
83 /* kill maestro process */
84 SIMIX_context_free(simix_global->maestro_process->context);
85 free(simix_global->maestro_process);
86 simix_global->maestro_process = NULL;
88 SIMIX_context_mod_exit();
91 /* the same context factory is requested return directly */
95 /* init the desired factory */
96 SIMIX_context_init_factory_by_name(&simix_global->context_factory, name);
98 SIMIX_create_maestro_process ();
106 * Initializes a context factory given by its name
108 void SIMIX_context_init_factory_by_name(smx_context_factory_t * factory,
112 if (!strcmp(name, "java"))
114 SIMIX_ctx_java_factory_init(factory);
116 THROW0(not_found_error, 0, "Factory 'Java' does not exist: Java support was not compiled in the SimGrid library");
117 #endif /* HAVE_JAVA */
119 else if (!strcmp(name, "thread"))
120 #ifdef CONTEXT_THREADS
121 SIMIX_ctx_thread_factory_init(factory);
123 THROW0(not_found_error, 0, "Factory 'thread' does not exist: thread support was not compiled in the SimGrid library");
124 #endif /* CONTEXT_THREADS */
126 else if (!strcmp(name, "sysv"))
127 #if !defined(WIN32) && !defined(CONTEXT_THREADS)
128 SIMIX_ctx_sysv_factory_init(factory);
130 THROW0(not_found_error, 0, "Factory 'sysv' does not exist: no System V thread support under Windows");
132 else if (!strcmp(name, "lua"))
134 SIMIX_ctx_lua_factory_init(factory);
137 THROW0(not_found_error, 0, "Factory 'lua' does not exist: Lua support was not compiled in the SimGrid library");
138 #endif /* HAVE_LUA */
140 else if (!strcmp(name,"ruby"))
142 SIMIX_ctx_ruby_factory_init(factory);
144 THROW0(not_found_error, 0, "Factory 'ruby' does not exist: Ruby support was not compiled in the SimGrid library");
147 THROW1(not_found_error, 0, "Factory '%s' does not exist", name);