X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/3de9bd297b49c6d0b62a18b21aef156da297dea7..ac7ec891d7a36e741b3a597c60e0dabbd8dbd7ee:/src/xbt/context.c

diff --git a/src/xbt/context.c b/src/xbt/context.c
index bc16f82279..c01edd42a2 100644
--- a/src/xbt/context.c
+++ b/src/xbt/context.c
@@ -11,7 +11,7 @@
 
 #include "portable.h"
 #include "context_private.h"
-#include "xbt/error.h"
+#include "xbt/log.h"
 #include "xbt/dynar.h"
 #include "gras_config.h"
 
@@ -25,17 +25,16 @@ static xbt_swag_t context_to_destroy = NULL;
 static xbt_swag_t context_living = NULL;
 
 #ifndef USE_PTHREADS /* USE_PTHREADS and USE_CONTEXT are exclusive */
-# ifndef HAVE_UCONTEXT_H
+# ifndef USE_UCONTEXT
 /* don't want to play with conditional compilation in automake tonight, sorry.
    include directly the c file from here when needed. */
 #  include "context_win32.c" 
+#  define USE_WIN_CONTEXT
 # endif
 #endif
 
 static void __xbt_context_yield(xbt_context_t context)
 {
-  int return_value = 0;
-
   xbt_assert0(current_context,"You have to call context_init() first.");
   
   DEBUG2("--------- current_context (%p) is yielding to context(%p) ---------",
@@ -64,6 +63,9 @@ static void __xbt_context_yield(xbt_context_t context)
   VOIRP(context);
   if(context) VOIRP(context->save);
   if (context) {
+
+    int return_value = 0;
+
     if(context->save==NULL) {
       DEBUG0("**** Yielding to somebody else ****");
       DEBUG2("Saving current_context value (%p) to context(%p)->save",current_context,context);
@@ -98,45 +100,85 @@ static void xbt_context_destroy(xbt_context_t context)
   pthread_mutex_destroy(&(context->mutex));
   pthread_cond_destroy(&(context->cond));
 #endif
+  if(context->exception) free(context->exception);
   free(context);
   return;
 }
 
-static void *__context_wrapper(void *c)
+static void __context_exit(xbt_context_t context ,int value)
 {
-  xbt_context_t context = c;
   int i;
+  DEBUG0("Freeing arguments");
+  for(i=0;i<context->argc; i++) 
+    if(context->argv[i]) free(context->argv[i]);
+  if(context->argv) free(context->argv);
+
+  if(context->cleanup_func) {
+    DEBUG0("Calling cleanup function");
+    context->cleanup_func(context->cleanup_arg);
+  }
 
+  DEBUG0("Putting context in the to_destroy set");
+  xbt_swag_remove(context, context_living);
+  xbt_swag_insert(context, context_to_destroy);
+  DEBUG0("Context put in the to_destroy set");
+
+  DEBUG0("Yielding");
 #ifdef USE_PTHREADS
-  DEBUG0("**** Lock ****");
+  DEBUG0("**** Locking ****");
   pthread_mutex_lock(&(context->mutex));
+  DEBUG0("**** Updating current_context ****");
+  current_context = context;
   DEBUG0("**** Releasing the prisonner ****");
+  pthread_cond_signal(&(context->cond));  
+  DEBUG0("**** Unlocking ****");
+  pthread_mutex_unlock(&(context->mutex));
+  DEBUG0("**** Exiting ****");
+  pthread_exit(0);
+#else
+  __xbt_context_yield(context);
+#endif
+  xbt_assert0(0,"You can't be here!");
+}
+
+static void *__context_wrapper(void *c)
+{
+  xbt_context_t context = c;
+
+#ifdef USE_PTHREADS
+  DEBUG2("**[%p:%p]** Lock ****",context,(void*)pthread_self());
+  pthread_mutex_lock(&(context->mutex));
+  DEBUG2("**[%p:%p]** Releasing the prisonner ****",context,(void*)pthread_self());
   pthread_cond_signal(&(context->cond));
-  DEBUG0("**** Going to Jail ****");
+  DEBUG2("**[%p:%p]** Going to Jail ****",context,(void*)pthread_self());
   pthread_cond_wait(&(context->cond), &(context->mutex));
-  DEBUG0("**** Unlocking ****");
+  DEBUG2("**[%p:%p]** Unlocking ****",context,(void*)pthread_self());
   pthread_mutex_unlock(&(context->mutex));
 #endif
 
   if(context->startup_func)
     context->startup_func(context->startup_arg);
 
-   DEBUG0("Calling the main function");
-  (context->code) (context->argc,context->argv);
+  DEBUG0("Calling the main function");
 
-  for(i=0;i<context->argc; i++) 
-    if(context->argv[i]) free(context->argv[i]);
-  if(context->argv) free(context->argv);
+  __context_exit(context, (context->code) (context->argc,context->argv));
+  return NULL;
+}
 
-  if(context->cleanup_func)
-    context->cleanup_func(context->cleanup_arg);
+/* callback: context fetching */
+static ex_ctx_t *__context_ex_ctx(void)
+{
+  return current_context->exception;
+}
 
-  xbt_swag_remove(context, context_living);
-  xbt_swag_insert(context, context_to_destroy);
+/* callback: termination */
+static void __context_ex_terminate(xbt_ex_t *e) {
+  xbt_ex_display(e);
 
-  __xbt_context_yield(context);
-  xbt_assert0(0,"You're cannot be here!");
-  return NULL;
+  if(current_context!=init_context) 
+    __context_exit(current_context, e->value);
+  else
+    abort();
 }
 
 /** \name Functions 
@@ -151,6 +193,10 @@ void xbt_context_init(void)
 {
   if(!current_context) {
     current_context = init_context = xbt_new0(s_xbt_context_t,1);
+    init_context->exception = xbt_new(ex_ctx_t,1);
+    XBT_CTX_INITIALIZE(init_context->exception);
+    __xbt_ex_ctx       = __context_ex_ctx;
+    __xbt_ex_terminate = __context_ex_terminate;
     context_to_destroy = xbt_swag_new(xbt_swag_offset(*current_context,hookup));
     context_living = xbt_swag_new(xbt_swag_offset(*current_context,hookup));
     xbt_swag_insert(init_context, context_living);
@@ -180,14 +226,15 @@ void xbt_context_start(xbt_context_t context)
 {
 #ifdef USE_PTHREADS
   /* Launch the thread */
-  DEBUG0("**** Locking ****");
+  DEBUG1("**[%p]** Locking ****",context);
   pthread_mutex_lock(&(context->mutex));
-  DEBUG0("**** Pthread create ****");
+  DEBUG1("**[%p]** Pthread create ****",context);
   xbt_assert0(!pthread_create(context->thread, NULL, __context_wrapper, context),
 	      "Unable to create a thread.");
-  DEBUG0("**** Going to jail ****");
+  DEBUG2("**[%p]** Pthread created : %p ****",context,(void*)(*(context->thread)));
+  DEBUG1("**[%p]** Going to jail ****",context);
   pthread_cond_wait(&(context->cond), &(context->mutex));
-  DEBUG0("**** Unlocking ****");
+  DEBUG1("**[%p]** Unlocking ****",context);
   pthread_mutex_unlock(&(context->mutex));  
 #else
   makecontext (&(context->uc), (void (*) (void)) __context_wrapper,
@@ -221,7 +268,7 @@ xbt_context_t xbt_context_new(xbt_context_function_t code,
   res->thread = xbt_new0(pthread_t,1);
   xbt_assert0(!pthread_mutex_init(&(res->mutex), NULL), "Mutex initialization error");
   xbt_assert0(!pthread_cond_init(&(res->cond), NULL), "Condition initialization error");
-#else
+#else 
   /* FIXME: strerror is not thread safe */
   xbt_assert2(getcontext(&(res->uc))==0,"Error in context saving: %d (%s)", errno, strerror(errno));
   res->uc.uc_link = NULL;
@@ -229,15 +276,19 @@ xbt_context_t xbt_context_new(xbt_context_function_t code,
   /* WARNING : when this context is over, the current_context (i.e. the 
      father), is awaken... Theorically, the wrapper should prevent using 
      this feature. */
-  res->uc.uc_stack.ss_sp = res->stack;
-  res->uc.uc_stack.ss_size = STACK_SIZE;
-#endif
+# ifndef USE_WIN_CONTEXT    
+  res->uc.uc_stack.ss_sp = pth_skaddr_makecontext(res->stack,STACK_SIZE);
+  res->uc.uc_stack.ss_size = pth_sksize_makecontext(res->stack,STACK_SIZE);
+# endif /* USE_WIN_CONTEXT */
+#endif /* USE_PTHREADS or not */
   res->argc = argc;
   res->argv = argv;
   res->startup_func = startup_func;
   res->startup_arg = startup_arg;
   res->cleanup_func = cleanup_func;
   res->cleanup_arg = cleanup_arg;
+  res->exception = xbt_new(ex_ctx_t,1);
+  XBT_CTX_INITIALIZE(res->exception);
 
   xbt_swag_insert(res, context_living);
 
@@ -263,6 +314,7 @@ void xbt_context_yield(void)
  */
 void xbt_context_schedule(xbt_context_t context)
 {
+  DEBUG1("Scheduling %p",context);
   xbt_assert0((current_context==init_context),
 	      "You are not supposed to run this function here!");
   __xbt_context_yield(context);