static xbt_swag_t context_to_destroy = NULL;
static xbt_swag_t context_living = NULL;
-#ifdef CONTEXT_THREADS
-static xbt_os_mutex_t creation_mutex;
-static xbt_os_cond_t creation_cond;
-static xbt_os_mutex_t master_mutex;
-static xbt_os_cond_t master_cond;
-
-static xbt_os_thread_t current_thread_id;
-
-static int is_main_thread(void) {
- return xbt_os_thread_self() == current_thread_id;
-}
-
-#endif
/********************/
}
#endif
+
+static void
+schedule(xbt_context_t c);
+
+static void
+unschedule(xbt_context_t c);
+
+
+static void
+schedule(xbt_context_t c)
+{
+ xbt_os_sem_post(c->begin);
+ xbt_os_sem_wait(c->end);
+}
+
+static void unschedule(xbt_context_t c)
+{
+ xbt_os_sem_post(c->end);
+ xbt_os_sem_wait(c->begin);
+}
+
/** \name Functions
* \ingroup XBT_context
*/
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
- /* only used during the creation of the processes */
- creation_mutex = xbt_os_mutex_init();
- creation_cond = xbt_os_cond_init();
-
- /* used to schedule/unschedule the processes */
- master_mutex = xbt_os_mutex_init();
- master_cond = xbt_os_cond_init();
-
- current_thread_id = xbt_os_thread_self();
-
-#else
+
+ #ifndef CONTEXT_THREADS
init_context->exception = xbt_new(ex_ctx_t, 1);
XBT_CTX_INITIALIZE(init_context->exception);
__xbt_ex_ctx = _context_ex_ctx;
}
}
-#ifdef CONTEXT_THREADS
- xbt_os_mutex_destroy(creation_mutex);
- xbt_os_cond_destroy(creation_cond);
- xbt_os_mutex_destroy(master_mutex);
- xbt_os_cond_destroy(master_cond);
-#else
+#ifndef CONTEXT_THREADS
free(init_context->exception);
#endif
}
+
/*******************************/
/* Object creation/destruction */
/*******************************/
res->name = xbt_strdup(name);
#ifdef CONTEXT_THREADS
- res->mutex = xbt_os_mutex_init();
- res->cond = xbt_os_cond_init();
+ /*
+ * initialize the semaphores used to schedule/unschedule
+ * the process associated to the newly created context
+ */
+ res->begin = xbt_os_sem_init(0,0);
+ res->end = xbt_os_sem_init(0,0);
#else
xbt_assert2(getcontext(&(res->uc)) == 0,
* (same than first case afterward)
*/
+
/* Argument must be stopped first -- runs in maestro context */
static void xbt_context_free(xbt_context_t context)
{
xbt_os_thread_join(context->thread, NULL);
- xbt_os_mutex_destroy(context->mutex);
- xbt_os_cond_destroy(context->cond);
+ /* destroy the semaphore used to schedule/unshedule the process */
+ xbt_os_sem_destroy(context->begin);
+ xbt_os_sem_destroy(context->end);
context->thread = NULL;
- context->mutex = NULL;
- context->cond = NULL;
+ context->begin = NULL;
+ context->end = NULL;
#else
if (context->exception)
free(context->exception);
#ifdef CONTEXT_THREADS
context = (xbt_context_t) c;
- context->thread = xbt_os_thread_self();
-
- DEBUG3("**[ctx:%p;self:%p]** Lock creation_mutex %p ****", context,
- (void *) xbt_os_thread_self(), creation_mutex);
- xbt_os_mutex_lock(creation_mutex);
- xbt_os_mutex_lock(context->mutex);
-
- DEBUG4
- ("**[ctx:%p;self:%p]** Releasing the creator (creation_cond %p,%p) ****",
- context, (void *) xbt_os_thread_self(), creation_cond, creation_mutex);
- xbt_os_cond_signal(creation_cond);
- xbt_os_mutex_unlock(creation_mutex);
-
- DEBUG4("**[ctx:%p;self:%p]** Going to Jail on lock %p and cond %p ****",
- context, (void *) xbt_os_thread_self(), context->mutex,
- context->cond);
- xbt_os_cond_wait(context->cond, context->mutex);
+ /*context->thread = xbt_os_thread_self();*/
- DEBUG3("**[ctx:%p;self:%p]** Unlocking individual %p ****", context,
- (void *) xbt_os_thread_self(), context->mutex);
- xbt_os_mutex_unlock(context->mutex);
+ /* signal its starting to the maestro and wait to start its job*/
+ unschedule(context);
#endif
xbt_context_stop((context->code) (context->argc, context->argv));
return NULL;
}
-
/**
* \param context the context to start
*
void xbt_context_start(xbt_context_t context)
{
#ifdef CONTEXT_THREADS
- /* Launch the thread */
-
- DEBUG3("**[ctx:%p;self:%p]** Locking creation_mutex %p ****", context,
- xbt_os_thread_self(), creation_mutex);
- xbt_os_mutex_lock(creation_mutex);
-
- DEBUG2("**[ctx:%p;self:%p]** Thread create ****", context,
- xbt_os_thread_self());
- context->thread =
- xbt_os_thread_create(context->name, __context_wrapper, context);
- DEBUG3("**[ctx:%p;self:%p]** Thread created : %p ****", context,
- xbt_os_thread_self(), context->thread);
-
- DEBUG4
- ("**[ctx:%p;self:%p]** Going to jail on creation_cond/mutex (%p,%p) ****",
- context, xbt_os_thread_self(), creation_cond, creation_mutex);
- xbt_os_cond_wait(creation_cond, creation_mutex);
- DEBUG3("**[ctx:%p;self:%p]** Unlocking creation %p ****", context,
- xbt_os_thread_self(), creation_mutex);
- xbt_os_mutex_unlock(creation_mutex);
+ /* create the process and start it */
+ context->thread = xbt_os_thread_create(context->name,__context_wrapper, context);
+
+ /* wait the starting of the newly created process */
+ xbt_os_sem_wait(context->end);
#else
makecontext(&(context->uc), (void (*)(void)) __context_wrapper, 1, context);
#endif
DEBUG0("Yielding");
#ifdef CONTEXT_THREADS
- /* a java thread has called this function
- * - update the current context
- * - signal the condition of the main thread
- * - wait on its condition
- * - restore thr current contex
- */
-
- xbt_os_mutex_lock(master_mutex);
- xbt_os_cond_signal(master_cond);
- xbt_os_mutex_unlock(master_mutex);
- xbt_os_thread_exit(NULL); /* We should provide return value in case other wants it */
-
-
+ /* signal to the maestro that it has finished */
+ xbt_os_sem_post(current_context->end);
+ /* exit*/
+ xbt_os_thread_exit(NULL); /* We should provide return value in case other wants it */
#else
__xbt_context_yield(current_context);
#endif
static void __xbt_context_yield(xbt_context_t context)
{
-#ifdef CONTEXT_THREADS
- xbt_context_t self;
-#endif
-
xbt_assert0(current_context, "You have to call context_init() first.");
xbt_assert0(context, "Invalid argument");
#ifdef CONTEXT_THREADS
- self = current_context;
-
- if (is_main_thread()) {
- /* the main thread has called this function
- * - update the current context
- * - signal the condition of the process to run
- * - wait on its condition
- * - restore thr current contex
- */
-
- xbt_os_mutex_lock(master_mutex);
- xbt_os_mutex_lock(context->mutex);
-
- /* update the current context */
- current_context = context;
- xbt_os_cond_signal(context->cond);
- xbt_os_mutex_unlock(context->mutex);
-
- xbt_os_cond_wait(master_cond, master_mutex);
- xbt_os_mutex_unlock(master_mutex);
- /* retore the current context */
- current_context = self;
-
- } else {
- /* a java thread has called this function
- * - update the current context
- * - signal the condition of the main thread
- * - wait on its condition
- * - restore thr current contex
- */
-
- xbt_os_mutex_lock(master_mutex);
- xbt_os_mutex_lock(context->mutex);
- /* update the current context */
- current_context = context;
- xbt_os_cond_signal(master_cond);
- xbt_os_mutex_unlock(master_mutex);
- xbt_os_cond_wait(context->cond, context->mutex);
- xbt_os_mutex_unlock(context->mutex);
- /* retore the current context */
- current_context = self;
- }
+ if(current_context != init_context && !context->iwannadie)
+ {/* it's a process and it doesn't wants to die (xbt_context_yield()) */
+
+ /* save the current context */
+ xbt_context_t self = current_context;
+
+ /* update the current context to this context */
+ current_context = context;
+
+ /* yield itself */
+ unschedule(context);
+
+ /* restore the current context to the previously saved context */
+ current_context = self;
+ }
+ else
+ { /* maestro wants to schedule a process or a process wants to die (xbt_context_schedule() or xbt_context_kill())*/
+
+ /* save the current context */
+ xbt_context_t self = current_context;
+
+ /* update the current context */
+ current_context = context;
+
+ /* schedule the process associated with this context */
+ schedule(context);
+
+ /* restore the current context to the previously saved context */
+ current_context = self;
+ }
#else /* use SUSv2 contexts */
VOIRP(current_context);
xbt_context_stop(1);
}
-
-
-
-
/**
* Calling this function makes the current context yield. The context
* that scheduled it returns from xbt_context_schedule as if nothing
}
/* 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_jenv(xbt_context_t context, void *je)
-{
-}
-void *xbt_context_get_jenv(xbt_context_t context)
-{
- return NULL;
-}
+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_jenv(xbt_context_t context,void* je){}
+void* xbt_context_get_jenv(xbt_context_t context){return NULL;}
/* @} */
