#include "xbt/log.h"
#include "xbt/dynar.h"
#include "xbt/xbt_thread.h"
+/*#include <pthread.h>*/ /* I need pthread_join that is not yet available in xbt_thread.*/
+
+#ifdef CONTEXT_THREADS
+ /* This file (context.c) is only loaded in libsimgrid, not libgras.
+ * xbt_thread is only loaded in libgras explicitly, and we need it in
+ * libsimgrid, but only when it is the backend used to implement the
+ * xbt_context. So, do load it on need.
+ */
+#include "xbt/xbt_thread.c"
+#endif
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_ctx, xbt, "Context");
static xbt_context_t init_context = NULL;
static xbt_swag_t context_to_destroy = NULL;
static xbt_swag_t context_living = NULL;
+#ifdef CONTEXT_THREADS
+static xbt_mutex_t creation_mutex;
+static xbt_thcond_t creation_cond;
+#endif
+static void __context_exit(xbt_context_t context ,int value);
static void __xbt_context_yield(xbt_context_t context)
{
xbt_assert0(current_context,"You have to call context_init() first.");
#ifdef CONTEXT_THREADS
if (context){
xbt_context_t self = current_context;
- DEBUG0("**** Locking ****");
+ DEBUG2("[%p] **** Locking ctx %p ****", self, context);
xbt_mutex_lock(context->mutex);
- DEBUG0("**** Updating current_context ****");
+ DEBUG1("[%p] **** Updating current_context ****", self);
current_context = context;
- DEBUG0("**** Releasing the prisonner ****");
+ DEBUG1("[%p] **** Releasing the prisonner ****", self);
xbt_thcond_signal(context->cond);
- DEBUG0("**** Going to jail ****");
+ DEBUG3("[%p] **** Going to jail on individual %p/%p ****", self,context->cond, context->mutex);
xbt_thcond_wait(context->cond, context->mutex);
- DEBUG0("**** Unlocking ****");
+ DEBUG2("[%p] **** Unlocking individual %p ****", self,context->mutex);
xbt_mutex_unlock(context->mutex);
- DEBUG0("**** Updating current_context ****");
+ DEBUG1("[%p] **** Updating current_context ****", self);
current_context = self;
}
#else /* use SUSv2 contexts */
if(context->save==NULL){
- DEBUG0("**** Yielding to somebody else ****");
+ DEBUG1("[%p] **** Yielding to somebody else ****", current_context);
DEBUG2("Saving current_context value (%p) to context(%p)->save",current_context,context);
context->save = current_context ;
DEBUG1("current_context becomes context(%p) ",context);
DEBUG1("I am (%p). Coming back\n",context);
} else {
xbt_context_t old_context = context->save ;
- DEBUG0("**** Back ! ****");
+ DEBUG1("[%p] **** Back ! ****", context);
DEBUG2("Setting current_context (%p) to context(%p)->save",current_context,context);
current_context = context->save ;
DEBUG1("Setting context(%p)->save to NULL",context);
}
}
#endif
+ if(current_context->iwannadie)
+ __context_exit(current_context, 1);
+
return;
}
-static void xbt_context_destroy(xbt_context_t context)
+static void xbt_context_free(xbt_context_t context)
{
if (!context) return;
+ DEBUG1("Freeing %p",context);
#ifdef CONTEXT_THREADS
+ /*DEBUG1("\t joining %p",(void *)context->thread->t);*/
+ DEBUG1("\t joining %p",(void *)context->thread);
+ /*pthread_join(context->thread->t,NULL);*/
+ xbt_thread_join(context->thread,NULL);
+ DEBUG1("\t xbt_free %p",(void *)context->thread);
xbt_free(context->thread);
+ DEBUG1("\t mutex_destroy %p",(void *)context->mutex);
xbt_mutex_destroy(context->mutex);
+ DEBUG1("\t cond_destroy %p",(void *)context->cond);
xbt_thcond_destroy(context->cond);
context->thread = NULL;
static void __context_exit(xbt_context_t context ,int value)
{
int i;
+
+ DEBUG1("--------- %p is exiting ---------",context);
+
+ DEBUG0("Calling cleanup functions");
+ if(context->cleanup_func){
+ DEBUG0("Calling cleanup function");
+ context->cleanup_func(context->cleanup_arg);
+ }
+
DEBUG0("Freeing arguments");
for(i=0;i<context->argc; i++)
if(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 CONTEXT_THREADS
- DEBUG0("**** Locking ****");
+ DEBUG2("[%p] **** Locking %p ****", context, context->mutex);
xbt_mutex_lock(context->mutex);
- DEBUG0("**** Updating current_context ****");
- current_context = context;
- DEBUG0("**** Releasing the prisonner ****");
+/* DEBUG1("[%p] **** Updating current_context ****"); */
+/* current_context = context; */
+ DEBUG1("[%p] **** Releasing the prisonner ****", context);
xbt_thcond_signal(context->cond);
- DEBUG0("**** Unlocking ****");
+ DEBUG2("[%p] **** Unlocking individual %p ****", context, context->mutex);
xbt_mutex_unlock(context->mutex);
- DEBUG0("**** Exiting ****");
- xbt_thread_exit(0);
+ DEBUG1("[%p] **** Exiting ****", context);
+ xbt_thread_exit(NULL); // We should provide return value in case other wants it
#else
__xbt_context_yield(context);
#endif
static void *
__context_wrapper(void* c) {
- xbt_context_t context = (xbt_context_t)c;
+ xbt_context_t context = (xbt_context_t) current_context;
#ifdef CONTEXT_THREADS
context->thread = xbt_thread_self();
- DEBUG2("**[%p:%p]** Lock ****",context,(void*)xbt_thread_self());
+ DEBUG3("**[ctx:%p;self:%p]** Lock creation_mutex %p ****",context,(void*)xbt_thread_self(), creation_mutex);
+ xbt_mutex_lock(creation_mutex);
xbt_mutex_lock(context->mutex);
- DEBUG2("**[%p:%p]** Releasing the prisonner ****",context,(void*)xbt_thread_self());
- xbt_thcond_signal(context->cond);
+ DEBUG4("**[ctx:%p;self:%p]** Releasing the creator (creation_cond %p,%p) ****",
+ context,(void*)xbt_thread_self(),creation_cond,creation_mutex);
+ xbt_thcond_signal(creation_cond);
+ xbt_mutex_unlock(creation_mutex);
- DEBUG2("**[%p:%p]** Going to Jail ****",context,(void*)xbt_thread_self());
+ DEBUG4("**[ctx:%p;self:%p]** Going to Jail on lock %p and cond %p ****",
+ context,(void*)xbt_thread_self(),context->mutex,context->cond);
xbt_thcond_wait(context->cond, context->mutex);
- DEBUG2("**[%p:%p]** Unlocking ****",context,(void*)xbt_thread_self());
+ DEBUG3("**[ctx:%p;self:%p]** Unlocking individual %p ****",
+ context,(void*)xbt_thread_self(),context->mutex);
xbt_mutex_unlock(context->mutex);
#endif
{
if(!current_context){
current_context = init_context = xbt_new0(s_xbt_context_t,1);
-
+ DEBUG1("Init Context (%p)",init_context);
+
init_context->exception = xbt_new(ex_ctx_t,1);
XBT_CTX_INITIALIZE(init_context->exception);
__xbt_ex_ctx = __context_ex_ctx;
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);
+#ifdef CONTEXT_THREADS
+ creation_mutex = xbt_mutex_init();
+ creation_cond = xbt_thcond_init();
+#endif
}
}
void xbt_context_empty_trash(void)
{
xbt_context_t context=NULL;
-
+ DEBUG1("Emptying trashbin (%d contexts to free)",
+ xbt_swag_size(context_to_destroy));
while((context=xbt_swag_extract(context_to_destroy)))
- xbt_context_destroy(context);
+ xbt_context_free(context);
}
/**
{
#ifdef CONTEXT_THREADS
/* Launch the thread */
- DEBUG1("**[%p]** Locking ****",context);
- xbt_mutex_lock(context->mutex);
+ DEBUG3("**[ctx:%p;self:%p]** Locking creation_mutex %p ****",context,xbt_thread_self(),creation_mutex);
+ xbt_mutex_lock(creation_mutex);
- DEBUG1("**[%p]** Thread create ****",context);
+ DEBUG2("**[ctx:%p;self:%p]** Thread create ****",context,xbt_thread_self());
context->thread = xbt_thread_create(__context_wrapper, context);
- DEBUG2("**[%p]** Thread created : %p ****",context,context->thread);
+ DEBUG3("**[ctx:%p;self:%p]** Thread created : %p ****",context,xbt_thread_self(),context->thread);
- DEBUG1("**[%p]** Going to jail ****",context);
- xbt_thcond_wait(context->cond, context->mutex);
- DEBUG1("**[%p]** Unlocking ****",context);
- xbt_mutex_unlock(context->mutex);
+ DEBUG4("**[ctx:%p;self:%p]** Going to jail on creation_cond/mutex (%p,%p) ****",
+ context,xbt_thread_self(),creation_cond, creation_mutex);
+ xbt_thcond_wait(creation_cond, creation_mutex);
+ DEBUG3("**[ctx:%p;self:%p]** Unlocking creation %p ****",context, xbt_thread_self(),creation_mutex);
+ xbt_mutex_unlock(creation_mutex);
#else
makecontext (&(context->uc), (void (*) (void)) __context_wrapper,1, context);
#endif
res->mutex = xbt_mutex_init();
res->cond = xbt_thcond_init();
#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;
/* res->uc.uc_link = &(current_context->uc); */
*/
void xbt_context_exit(void) {
xbt_context_t context=NULL;
-
- xbt_context_empty_trash();
- xbt_swag_free(context_to_destroy);
+ xbt_context_empty_trash();
while((context=xbt_swag_extract(context_living))) {
- xbt_context_free(context);
+ if(context!=init_context) {
+ xbt_context_kill(context);
+ }
}
-
+ free(init_context->exception);
+ free(init_context);
+ init_context = current_context = NULL ;
+
+ xbt_context_empty_trash();
+ xbt_swag_free(context_to_destroy);
xbt_swag_free(context_living);
- init_context = current_context = NULL ;
+#ifdef CONTEXT_THREADS
+ xbt_mutex_destroy(creation_mutex);
+ xbt_thcond_destroy(creation_cond);
+#endif
}
/**
*
* This function simply kills \a context... scarry isn't it ?
*/
-void xbt_context_free(xbt_context_t context)
+void xbt_context_kill(xbt_context_t context)
{
- int i ;
-
-
- xbt_swag_remove(context, context_living);
-
- 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)
- context->cleanup_func(context->cleanup_arg);
-
- xbt_context_destroy(context);
+ DEBUG1("Killing %p", context);
+
+ context->iwannadie=1;
+ DEBUG1("Scheduling %p",context);
+ __xbt_context_yield(context);
+ DEBUG1("End of Scheduling %p",context);
return;
}
