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. */
14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix, "Context switching mecanism");
18 * This function is call by SIMIX_global_init() to initialize the context module.
20 void SIMIX_context_mod_init(void)
22 if (!simix_global->context_factory) {
23 /* select context factory to use to create the context(depends of the macro definitions) */
25 #ifdef CONTEXT_THREADS
26 /* context switch based os thread */
27 SIMIX_ctx_thread_factory_init(&simix_global->context_factory);
29 /* context switch based ucontext */
30 SIMIX_ctx_sysv_factory_init(&simix_global->context_factory);
32 /* context switch is not allowed on Windows */
33 #error ERROR [__FILE__, line __LINE__]: no context based implementation specified.
39 * This function is call by SIMIX_clean() to finalize the context module.
41 void SIMIX_context_mod_exit(void)
43 if (simix_global->context_factory) {
44 smx_pfn_context_factory_finalize_t finalize_factory;
46 /* finalize the context factory */
47 finalize_factory = simix_global->context_factory->finalize;
48 (*finalize_factory) (&simix_global->context_factory);
53 * This function is used to change the context factory.
54 * Warning: it destroy all the existing processes (even for maestro), and it
55 * will create a new maestro process using the new context factory.
57 int SIMIX_context_select_factory(const char *name)
59 /* if a context factory is already instantiated and it is different from the
60 newly selected one, then kill all the processes, exit the context module
61 and initialize the new factory.
63 if (simix_global->context_factory != NULL) {
64 if (strcmp(simix_global->context_factory->name, name)){
66 SIMIX_process_killall();
68 /* kill maestro process */
69 SIMIX_context_free(simix_global->maestro_process->context);
70 free(simix_global->maestro_process);
71 simix_global->maestro_process = NULL;
73 SIMIX_context_mod_exit();
76 /* the same context factory is requested return directly */
80 /* init the desired factory */
81 SIMIX_context_init_factory_by_name(&simix_global->context_factory, name);
83 SIMIX_create_maestro_process ();
89 * Initializes a context factory given by its name
91 void SIMIX_context_init_factory_by_name(smx_context_factory_t * factory,
94 if (!strcmp(name, "java"))
96 SIMIX_ctx_java_factory_init(factory);
98 THROW0(not_found_error, 0, "Factory 'Java' does not exist: Java support was not compiled in the SimGrid library");
99 #endif /* HAVE_JAVA */
101 else if (!strcmp(name, "thread"))
102 #ifdef CONTEXT_THREADS
103 SIMIX_ctx_thread_factory_init(factory);
105 THROW0(not_found_error, 0, "Factory 'thread' does not exist: thread support was not compiled in the SimGrid library");
106 #endif /* CONTEXT_THREADS */
108 else if (!strcmp(name, "sysv"))
109 #if !defined(WIN32) && !defined(CONTEXT_THREADS)
110 SIMIX_ctx_sysv_factory_init(factory);
112 THROW0(not_found_error, 0, "Factory 'sysv' does not exist: no System V thread support under Windows");
115 THROW1(not_found_error, 0, "Factory '%s' does not exist", name);