return res;
}
+/* Scenario for the end of a context:
+ *
+ * CASE 1: death after end of function
+ * __context_wrapper, called by os thread, calls xbt_context_stop after user code stops
+ * xbt_context_stop calls user cleanup_func if any (in context settings),
+ * add current to trashbin
+ * yields back to maestro (destroy os thread on need)
+ * From time to time, maestro calls xbt_context_empty_trash,
+ * which maps xbt_context_free on the content
+ * xbt_context_free frees some more memory,
+ * joins os thread
+ *
+ * CASE 2: brutal death
+ * xbt_context_kill (from any context)
+ * set context->wannadie to 1
+ * yields to the context
+ * the context is awaken in the middle of __yield.
+ * At the end of it, it checks that wannadie == 1, and call xbt_context_stop
+ * (same than first case afterward)
+ */
+
+/* Argument must be stopped first -- runs in maestro context */
static void xbt_context_free(xbt_context_t context) {
+ int i;
+
if (!context)
return;
DEBUG1("Freeing %p", context);
free(context->name);
+
+ DEBUG0("Freeing arguments");
+ for (i = 0; i < context->argc; i++)
+ if (context->argv[i])
+ free(context->argv[i]);
+ if (context->argv)
+ free(context->argv);
+
#ifdef CONTEXT_THREADS
- /*DEBUG1("\t joining %p",(void *)context->thread->t); */
DEBUG1("\t joining %p", (void *) context->thread);
xbt_os_thread_join(context->thread, NULL);
- DEBUG1("\t mutex_destroy %p", (void *) context->mutex);
xbt_os_mutex_destroy(context->mutex);
- DEBUG1("\t cond_destroy %p", (void *) context->cond);
xbt_os_cond_destroy(context->cond);
context->thread = NULL;
/************************/
/* Start/stop a context */
/************************/
-static void xbt_context_stop(xbt_context_t context, int value);
+static void xbt_context_stop(int retvalue);
+static void __xbt_context_yield(xbt_context_t context);
static void *__context_wrapper(void *c)
{
DEBUG0("Calling the main function");
- xbt_context_stop(context, (context->code) (context->argc, context->argv));
+ xbt_context_stop((context->code) (context->argc, context->argv));
return NULL;
}
/**
return;
}
-static void xbt_context_stop(xbt_context_t context, int value)
-{
- int i;
-
- DEBUG1("--------- %p is exiting ---------", context);
+/* Stops current context: calls user's cleanup function, kills os thread, and yields back to maestro */
+static void xbt_context_stop(int retvalue) {
+ DEBUG1("--------- %p is exiting ---------", current_context);
- DEBUG0("Calling cleanup functions");
- if (context->cleanup_func) {
+ if (current_context->cleanup_func) {
DEBUG0("Calling cleanup function");
- context->cleanup_func(context->cleanup_arg);
+ current_context->cleanup_func(current_context->cleanup_arg);
}
- DEBUG0("Freeing arguments");
- for (i = 0; i < context->argc; i++)
- if (context->argv[i])
- free(context->argv[i]);
-
- if (context->argv)
- free(context->argv);
-
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");
+ xbt_swag_remove(current_context, context_living);
+ xbt_swag_insert(current_context, context_to_destroy);
DEBUG0("Yielding");
#ifdef CONTEXT_THREADS
- DEBUG2("[%p] **** Locking %p ****", context, context->mutex);
- xbt_os_mutex_lock(context->mutex);
-/* DEBUG1("[%p] **** Updating current_context ****"); */
-/* current_context = context; */
- DEBUG1("[%p] **** Releasing the prisonner ****", context);
- xbt_os_cond_signal(context->cond);
- DEBUG2("[%p] **** Unlocking individual %p ****", context,
- context->mutex);
- xbt_os_mutex_unlock(context->mutex);
- DEBUG1("[%p] **** Exiting ****", context);
+ DEBUG2("[%p] **** Locking %p ****", current_context, current_context->mutex);
+ xbt_os_mutex_lock(current_context->mutex);
+ DEBUG1("[%p] **** Releasing the prisonner ****", current_context);
+ xbt_os_cond_signal(current_context->cond);
+ DEBUG2("[%p] **** Unlocking individual %p ****", current_context,
+ current_context->mutex);
+ xbt_os_mutex_unlock(current_context->mutex);
+ DEBUG1("[%p] **** Exiting ****", current_context);
xbt_os_thread_exit(NULL); // We should provide return value in case other wants it
#else
- __xbt_context_yield(context);
+ __xbt_context_yield(current_context);
#endif
xbt_assert0(0, "You can't be here!");
}
static void __xbt_context_yield(xbt_context_t context)
{
- xbt_assert0(current_context, "You have to call context_init() first.");
+#ifdef CONTEXT_THREADS
+ xbt_context_t self;
+#endif
+xbt_assert0(current_context, "You have to call context_init() first.");
+ xbt_assert0(context,"Invalid argument");
- DEBUG2
- ("--------- current_context (%p) is yielding to context(%p) ---------",
+ if (current_context == context) {
+ DEBUG1("--------- current_context (%p) is yielding back to maestro ---------",
+ context);
+ } else {
+ DEBUG2("--------- current_context (%p) is yielding to context(%p) ---------",
current_context, context);
+ }
#ifdef CONTEXT_THREADS
- if (context) {
- xbt_context_t self = current_context;
- DEBUG2("[%p] **** Locking ctx %p ****", self, context);
- xbt_os_mutex_lock(context->mutex);
- DEBUG1("[%p] **** Updating current_context ****", self);
- current_context = context;
- DEBUG1("[%p] **** Releasing the prisonner ****", self);
- xbt_os_cond_signal(context->cond);
- DEBUG3("[%p] **** Going to jail on individual %p/%p ****", self,
- context->cond, context->mutex);
- xbt_os_cond_wait(context->cond, context->mutex);
- DEBUG2("[%p] **** Unlocking individual %p ****", self, context->mutex);
- xbt_os_mutex_unlock(context->mutex);
- DEBUG1("[%p] **** Updating current_context ****", self);
- current_context = self;
- }
+ self = current_context;
+ DEBUG2("[%p] **** Locking ctx %p ****", self, context);
+ xbt_os_mutex_lock(context->mutex);
+ DEBUG1("[%p] **** Updating current_context ****", self);
+ current_context = context;
+ DEBUG1("[%p] **** Releasing the prisonner ****", self);
+ xbt_os_cond_signal(context->cond);
+ DEBUG3("[%p] **** Going to jail on individual %p/%p ****", self,
+ context->cond, context->mutex);
+ xbt_os_cond_wait(context->cond, context->mutex);
+ DEBUG2("[%p] **** Unlocking individual %p ****", self, context->mutex);
+ xbt_os_mutex_unlock(context->mutex);
+ DEBUG1("[%p] **** Updating current_context ****", self);
+ current_context = self;
+
#else /* use SUSv2 contexts */
VOIRP(current_context);
- if (current_context)
- VOIRP(current_context->save);
+ VOIRP(current_context->save);
VOIRP(context);
+ VOIRP(context->save);
- if (context)
- VOIRP(context->save);
-
- if (context) {
-
- int return_value = 0;
-
- if (context->save == NULL) {
+ int return_value = 0;
- DEBUG1("[%p] **** Yielding to somebody else ****", current_context);
- DEBUG2("Saving current_context value (%p) to context(%p)->save",
+ if (context->save == NULL) {
+ xbt_assert(context == current_context);
+ 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);
- current_context = context;
- DEBUG1
+ context->save = current_context;
+ DEBUG1("current_context becomes context(%p) ", context);
+ current_context = context;
+ DEBUG1
("Current position memorized (context->save). Jumping to context (%p)",
context);
- return_value = swapcontext(&(context->save->uc), &(context->uc));
- xbt_assert0((return_value == 0), "Context swapping failure");
- DEBUG1("I am (%p). Coming back\n", context);
- } else {
- xbt_context_t old_context = context->save;
- 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);
- context->save = NULL;
- DEBUG2("Current position memorized (%p). Jumping to context (%p)",
- context, old_context);
- return_value = swapcontext(&(context->uc), &(old_context->uc));
- xbt_assert0((return_value == 0), "Context swapping failure");
- DEBUG1("I am (%p). Coming back\n", context);
-
- }
+ return_value = swapcontext(&(context->save->uc), &(context->uc));
+ xbt_assert0((return_value == 0), "Context swapping failure");
+ DEBUG1("I am (%p). Coming back\n", context);
+ } else {
+ xbt_context_t old_context = context->save;
+ 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);
+ context->save = NULL;
+ DEBUG2("Current position memorized (%p). Jumping to context (%p)",
+ context, old_context);
+ return_value = swapcontext(&(context->uc), &(old_context->uc));
+ xbt_assert0((return_value == 0), "Context swapping failure");
+ DEBUG1("I am (%p). Coming back\n", context);
}
#endif
if (current_context->iwannadie)
- xbt_context_stop(current_context, 1);
+ xbt_context_stop(1);
return;
}
* Calling this function makes the current context yield. The context
* that scheduled it returns from xbt_context_schedule as if nothing
* had happened.
+ *
+ * Only the processes can call this function, giving back the control
+ * to the maestro
*/
void xbt_context_yield(void)
{
* Calling this function blocks the current context and schedule \a context.
* When \a context will call xbt_context_yield, it will return
* to this function as if nothing had happened.
+ *
+ * Only the maestro can call this function to run a given process.
*/
void xbt_context_schedule(xbt_context_t context)
{
/* Java cruft I'm gonna kill in the next cleanup round */
void xbt_context_set_jprocess(xbt_context_t context, void *jp){}
void* xbt_context_get_jprocess(xbt_context_t context){return NULL;}
-void xbt_context_set_jmutex(xbt_context_t context,void *jm){}
-void* xbt_context_get_jmutex(xbt_context_t context){return NULL;}
-void xbt_context_set_jcond(xbt_context_t context,void *jc){}
-void* xbt_context_get_jcond(xbt_context_t context){return NULL;}
void xbt_context_set_jenv(xbt_context_t context,void* je){}
void* xbt_context_get_jenv(xbt_context_t context){return NULL;}
