X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/d869090cbfe6a45bedf556f99e16612c595e3a98..c877c01054ec01a7856db023668a07da7e78ebf6:/src/simix/smx_context.c

diff --git a/src/simix/smx_context.c b/src/simix/smx_context.c
index 006c478fb8..15772ca4fc 100644
--- a/src/simix/smx_context.c
+++ b/src/simix/smx_context.c
@@ -1,7 +1,7 @@
 /* a fast and simple context switching library                              */
 
-/* Copyright (c) 2004-2008 the SimGrid team.                                */
-/* All rights reserved.                                                     */
+/* Copyright (c) 2009, 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. */
@@ -11,27 +11,31 @@
 #include "xbt/swag.h"
 #include "private.h"
 
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix, "Context switching mecanism");
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix,
+                                "Context switching mecanism");
 
+const char *xbt_ctx_factory_to_use = NULL;
+typedef void (*SIMIX_ctx_factory_initializer_t)(smx_context_factory_t *);
+SIMIX_ctx_factory_initializer_t factory_initializer_to_use = NULL;
 
-/**
- * This function is call by SIMIX_global_init() to initialize the context module.
+/** 
+ * This function is called by SIMIX_global_init() to initialize the context module.
  */
 void SIMIX_context_mod_init(void)
 {
   if (!simix_global->context_factory) {
-  /* select context factory to use to create the context(depends of the macro definitions) */
-
-#ifdef CONTEXT_THREADS
-    /* context switch based os thread */
-    SIMIX_ctx_thread_factory_init(&simix_global->context_factory);
-#elif !defined(WIN32)
-    /* context switch based ucontext */
-    SIMIX_ctx_sysv_factory_init(&simix_global->context_factory);
+    /* select context factory to use to create the context(depends of the macro definitions) */
+    if (factory_initializer_to_use) {
+      (*factory_initializer_to_use)(&(simix_global->context_factory));
+    } else {
+#ifdef CONTEXT_THREADS /* Use os threads (either pthreads or windows ones) */
+      SIMIX_ctx_thread_factory_init(&simix_global->context_factory);
+#elif defined(CONTEXT_UCONTEXT) /* use ucontext */
+      SIMIX_ctx_sysv_factory_init(&simix_global->context_factory);
 #else
-    /* context switch is not allowed on Windows */
-#error ERROR [__FILE__, line __LINE__]: no context based implementation specified.
+#error ERROR [__FILE__, line __LINE__]: no context implementation specified.
 #endif
+    }
   }
 }
 
@@ -42,7 +46,7 @@ void SIMIX_context_mod_exit(void)
 {
   if (simix_global->context_factory) {
     smx_pfn_context_factory_finalize_t finalize_factory;
-    
+
     /* finalize the context factory */
     finalize_factory = simix_global->context_factory->finalize;
     (*finalize_factory) (&simix_global->context_factory);
@@ -59,58 +63,59 @@ int SIMIX_context_select_factory(const char *name)
   /* if a context factory is already instantiated and it is different from the
      newly selected one, then kill all the processes, exit the context module
      and initialize the new factory.
-  */
+   */
+
+
   if (simix_global->context_factory != NULL) {
-    if (strcmp(simix_global->context_factory->name, name)){
+    if (strcmp(simix_global->context_factory->name, name)) {
 
       SIMIX_process_killall();
-      
+
       /* kill maestro process */
       SIMIX_context_free(simix_global->maestro_process->context);
-      free(simix_global->maestro_process);  
+      free(simix_global->maestro_process);
       simix_global->maestro_process = NULL;
 
       SIMIX_context_mod_exit();
-    }
-    else
+    } else
       /* the same context factory is requested return directly */
       return 0;
   }
-  
-  /* init the desired factory */
-  SIMIX_context_init_factory_by_name(&simix_global->context_factory, name);
 
-  SIMIX_create_maestro_process ();
-  
-  return 0;
-}
-
-/**
- * Initializes a context factory given by its name
- */
-void SIMIX_context_init_factory_by_name(smx_context_factory_t * factory,
-                                        const char *name)
-{
+  /* init the desired factory */
+  smx_context_factory_t * factory = &simix_global->context_factory;
   if (!strcmp(name, "java"))
-#ifdef HAVE_JAVA     
+#ifdef HAVE_JAVA
     SIMIX_ctx_java_factory_init(factory);
 #else
-    THROW0(not_found_error, 0, "Factory 'Java' does not exist: Java support was not compiled in the SimGrid library");
-#endif /* HAVE_JAVA */
-   
+    THROW0(not_found_error, 0,
+           "Factory 'Java' does not exist: Java support was not compiled in the SimGrid library");
+#endif                          /* HAVE_JAVA */
+
   else if (!strcmp(name, "thread"))
 #ifdef CONTEXT_THREADS
     SIMIX_ctx_thread_factory_init(factory);
 #else
-    THROW0(not_found_error, 0, "Factory 'thread' does not exist: thread support was not compiled in the SimGrid library");
-#endif /* CONTEXT_THREADS */
-   
+    THROW0(not_found_error, 0,
+           "Factory 'thread' does not exist: thread support was not compiled in the SimGrid library");
+#endif                          /* CONTEXT_THREADS */
+
   else if (!strcmp(name, "sysv"))
-#if !defined(WIN32) && !defined(CONTEXT_THREADS)
+#if !defined(_XBT_WIN32) && !defined(CONTEXT_THREADS)
     SIMIX_ctx_sysv_factory_init(factory);
 #else
-    THROW0(not_found_error, 0, "Factory 'sysv' does not exist: no System V thread support under Windows");
-#endif   
+    THROW0(not_found_error, 0,
+           "Factory 'sysv' does not exist: no System V thread support under Windows");
+#endif
+
   else
     THROW1(not_found_error, 0, "Factory '%s' does not exist", name);
+
+
+
+
+  SIMIX_create_maestro_process();
+
+  return 0;
 }
+