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_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;
-
-#ifdef WIN32
-static DWORD __current_thread_id = 0;
-#else
-static pthread_t __current_thread_id;
-#endif
-static int
-is_main_thread(void);
-
-static int
-is_main_thread(void)
-{
- #ifdef WIN32
- return (GetCurrentThreadId() == __current_thread_id) ? 1 : 0;
- #else
- return (pthread_self() == __current_thread_id) ? 1 : 0;
- #endif
-}
-
-#endif
/********************/
#ifndef CONTEXT_THREADS
/* callback: context fetching (used only with ucontext, os_thread deal with it
for us otherwise) */
-static ex_ctx_t *_context_ex_ctx(void) {
+static ex_ctx_t *_context_ex_ctx(void)
+{
return current_context->exception;
}
/* callback: termination */
-static void _context_ex_terminate(xbt_ex_t * e) {
+static void _context_ex_terminate(xbt_ex_t * e)
+{
xbt_ex_display(e);
abort();
/* FIXME: there should be a configuration variable to
choose to kill everyone or only this one */
}
-#endif
+#endif
+
+#ifdef CONTEXT_THREADS
+
+static void
+schedule(xbt_context_t c);
+
+static void
+yield(xbt_context_t c);
+
+static void
+schedule(xbt_context_t c)
+{
+ xbt_os_sem_release(c->begin);
+ xbt_os_sem_acquire(c->end);
+}
+
+static void yield(xbt_context_t c)
+{
+ xbt_os_sem_release(c->end);
+ xbt_os_sem_acquire(c->begin);
+}
+#endif
/** \name Functions
* \ingroup XBT_context
*
* \warning It has to be called before using any other function of this module.
*/
-void
-xbt_context_init(void)
+void xbt_context_init(void)
{
- if (!current_context)
- {
- current_context = init_context = xbt_new0(s_xbt_context_t, 1);
- DEBUG1("Init Context (%p)", init_context);
- init_context->iwannadie = 0; /* useless but makes valgrind happy */
- 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
- /* 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();
-
- #ifdef WIN32
- __current_thread_id = GetCurrentThreadId();
- #else
- __current_thread_id = pthread_self();
- #endif
- #else
- 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;
- #endif
- }
+ if (!current_context) {
+ current_context = init_context = xbt_new0(s_xbt_context_t, 1);
+ DEBUG1("Init Context (%p)", init_context);
+ init_context->iwannadie = 0; /* useless but makes valgrind happy */
+ 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);
+
+ #ifndef CONTEXT_THREADS
+ 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;
+#endif
+ }
}
/**
* This function kill all existing context and free all the memory
* that has been allocated in this module.
*/
-void
-xbt_context_exit(void)
+void xbt_context_exit(void)
{
- xbt_context_t context = NULL;
-
- xbt_context_empty_trash();
-
- while ((context = xbt_swag_extract(context_living)))
- {
- if (context != init_context)
- {
- xbt_context_kill(context);
- }
- }
-
- #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
- free(init_context->exception);
- #endif
-
- free(init_context);
- init_context = current_context = NULL;
-
- xbt_context_empty_trash();
- xbt_swag_free(context_to_destroy);
- xbt_swag_free(context_living);
+ xbt_context_t context = NULL;
+
+ xbt_context_empty_trash();
+
+ while ((context = xbt_swag_extract(context_living))) {
+ if (context != init_context) {
+ xbt_context_kill(context);
+ }
+ }
+
+#ifndef CONTEXT_THREADS
+ free(init_context->exception);
+#endif
+
+ free(init_context);
+ init_context = current_context = NULL;
+
+ xbt_context_empty_trash();
+ xbt_swag_free(context_to_destroy);
+ xbt_swag_free(context_living);
}
+
/*******************************/
/* Object creation/destruction */
/*******************************/
* \param argc first argument of function \a code
* \param argv seconde argument of function \a code
*/
-xbt_context_t
-xbt_context_new( const char *name,
- xbt_main_func_t code,
- void_f_pvoid_t startup_func,
- void *startup_arg,
- void_f_pvoid_t cleanup_func,
- void *cleanup_arg,
- int argc,
- char *argv[]
-)
+xbt_context_t
+xbt_context_new(const char *name,
+ xbt_main_func_t code,
+ void_f_pvoid_t startup_func,
+ void *startup_arg,
+ void_f_pvoid_t cleanup_func,
+ void *cleanup_arg, int argc, char *argv[]
+ )
{
- xbt_context_t res = NULL;
+ xbt_context_t res = NULL;
- res = xbt_new0(s_xbt_context_t, 1);
+ res = xbt_new0(s_xbt_context_t, 1);
- res->code = code;
- res->name = xbt_strdup(name);
+ res->code = code;
+ res->name = xbt_strdup(name);
- #ifdef CONTEXT_THREADS
- res->mutex = xbt_os_mutex_init();
- res->cond = xbt_os_cond_init();
- #else
+#ifdef CONTEXT_THREADS
+ /*
+ * initialize the semaphores used to schedule/yield
+ * the process associated to the newly created context
+ */
+ res->begin = xbt_os_sem_init(0);
+ res->end = xbt_os_sem_init(0);
+#else
- 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); */
- /* 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 = pth_skaddr_makecontext(res->stack, STACK_SIZE);
- res->uc.uc_stack.ss_size =
- pth_sksize_makecontext(res->stack, STACK_SIZE);
+ 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); */
+ /* 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 = pth_skaddr_makecontext(res->stack, STACK_SIZE);
+ res->uc.uc_stack.ss_size = pth_sksize_makecontext(res->stack, STACK_SIZE);
- res->exception = xbt_new(ex_ctx_t, 1);
- XBT_CTX_INITIALIZE(res->exception);
- #endif /* CONTEXT_THREADS or not */
+ res->exception = xbt_new(ex_ctx_t, 1);
+ XBT_CTX_INITIALIZE(res->exception);
+#endif /* CONTEXT_THREADS or not */
- res->iwannadie = 0; /* useless but makes valgrind happy */
+ res->iwannadie = 0; /* useless but makes valgrind happy */
- 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->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;
- xbt_swag_insert(res, context_living);
+ xbt_swag_insert(res, context_living);
- return res;
+ return res;
}
/* Scenario for the end of a context:
* (same than first case afterward)
*/
+
/* Argument must be stopped first -- runs in maestro context */
-static void
-xbt_context_free(xbt_context_t context)
+static void xbt_context_free(xbt_context_t context)
{
- int i;
+ int i;
+
+ if (!context)
+ return;
- if (!context)
- return;
+ DEBUG1("Freeing %p", context);
+ free(context->name);
- DEBUG1("Freeing %p", context);
- free(context->name);
+ DEBUG0("Freeing arguments");
- DEBUG0("Freeing arguments");
+ for (i = 0; i < context->argc; i++)
+ if (context->argv[i])
+ free(context->argv[i]);
- for (i = 0; i < context->argc; i++)
- if (context->argv[i])
- free(context->argv[i]);
-
- if (context->argv)
- free(context->argv);
+ if (context->argv)
+ free(context->argv);
- #ifdef CONTEXT_THREADS
- DEBUG1("\t joining %p", (void *) context->thread);
+#ifdef CONTEXT_THREADS
+ DEBUG1("\t joining %p", (void *) context->thread);
- xbt_os_thread_join(context->thread, NULL);
+ 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;
- #else
- if (context->exception)
- free(context->exception);
- #endif
+ context->thread = NULL;
+ context->begin = NULL;
+ context->end = NULL;
+#else
+ if (context->exception)
+ free(context->exception);
+#endif
- free(context);
- return;
+ free(context);
}
/************************/
static void xbt_context_stop(int retvalue);
static void __xbt_context_yield(xbt_context_t context);
-static void *
-__context_wrapper(void *c)
+static void *__context_wrapper(void *c)
{
- xbt_context_t context = current_context;
+ xbt_context_t context = current_context;
- #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);
+#ifdef CONTEXT_THREADS
+ context = (xbt_context_t) c;
+ /*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*/
+ yield(context);
- #endif
+#endif
- if (context->startup_func)
- context->startup_func(context->startup_arg);
+ if (context->startup_func)
+ context->startup_func(context->startup_arg);
- DEBUG0("Calling the main function");
+ DEBUG0("Calling the main function");
- xbt_context_stop((context->code) (context->argc, context->argv));
- return NULL;
+ xbt_context_stop((context->code) (context->argc, context->argv));
+ return NULL;
}
/**
* \param context the context to start
* Calling this function prepares \a context to be run. It will
however run effectively only when calling #xbt_context_schedule
*/
-void
-xbt_context_start(xbt_context_t context)
+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);
- #else
- makecontext(&(context->uc), (void (*)(void)) __context_wrapper, 1, context);
- #endif
+#ifdef CONTEXT_THREADS
+ /* 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_acquire(context->end);
+#else
+ makecontext(&(context->uc), (void (*)(void)) __context_wrapper, 1, context);
+#endif
}
/* Stops current context: calls user's cleanup function, kills os thread, and yields back to maestro */
-static void
-xbt_context_stop(int retvalue)
+static void xbt_context_stop(int retvalue)
{
- DEBUG1("--------- %p is exiting ---------", current_context);
-
- if (current_context->cleanup_func)
- {
- DEBUG0("Calling cleanup function");
- current_context->cleanup_func(current_context->cleanup_arg);
- }
-
- DEBUG0("Putting context in the to_destroy set");
- xbt_swag_remove(current_context, context_living);
- xbt_swag_insert(current_context, context_to_destroy);
+ DEBUG1("--------- %p is exiting ---------", current_context);
- DEBUG0("Yielding");
+ if (current_context->cleanup_func) {
+ DEBUG0("Calling cleanup function");
+ current_context->cleanup_func(current_context->cleanup_arg);
+ }
- #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
- */
+ DEBUG0("Putting context in the to_destroy set");
+ xbt_swag_remove(current_context, context_living);
+ xbt_swag_insert(current_context, context_to_destroy);
- 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 */
-
-
- #else
- __xbt_context_yield(current_context);
- #endif
+ DEBUG0("Yielding");
- xbt_assert0(0, "You can't be here!");
+#ifdef CONTEXT_THREADS
+ /* signal to the maestro that it has finished */
+ xbt_os_sem_release(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
+ THROW_IMPOSSIBLE;
}
* Should be called some time to time to free the memory allocated for contexts
* that have finished executing their main functions.
*/
-void
-xbt_context_empty_trash(void)
+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_free(context);
+ 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_free(context);
}
/*********************/
/* context switching */
/*********************/
-static void
-__xbt_context_yield(xbt_context_t context)
+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");
-
- 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);
- }
+ xbt_assert0(current_context, "You have to call context_init() first.");
+ xbt_assert0(context, "Invalid argument");
+
+ 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
- #ifdef CONTEXT_THREADS
+ if(current_context != init_context && !context->iwannadie)
+ {/* it's a process and it doesn't wants to die (xbt_context_yield()) */
- 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;
- }
-
- #else /* use SUSv2 contexts */
- VOIRP(current_context);
- VOIRP(current_context->save);
-
- VOIRP(context);
- VOIRP(context->save);
-
- int return_value = 0;
-
- 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
- ("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);
- }
- #endif
-
- if (current_context->iwannadie)
- xbt_context_stop(1);
+ /* save the current context */
+ xbt_context_t self = current_context;
- return;
-}
+ /* update the current context to this context */
+ current_context = context;
+
+ /* yield itself */
+ yield(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);
+ VOIRP(current_context->save);
+
+ VOIRP(context);
+ VOIRP(context->save);
+
+ int return_value = 0;
+
+ if (context->save == NULL) {
+ 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
+ ("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);
+ }
+#endif
+ if (current_context->iwannadie)
+ xbt_context_stop(1);
+}
/**
* Calling this function makes the current context yield. The context
* Only the processes can call this function, giving back the control
* to the maestro
*/
-void
-xbt_context_yield(void)
+void xbt_context_yield(void)
{
__xbt_context_yield(current_context);
}
*
* Only the maestro can call this function to run a given process.
*/
-void
-xbt_context_schedule(xbt_context_t context)
+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_assert0((current_context == init_context),
+ "You are not supposed to run this function here!");
__xbt_context_yield(context);
}
*
* This function simply kills \a context... scarry isn't it ?
*/
-void
-xbt_context_kill(xbt_context_t context)
+void xbt_context_kill(xbt_context_t context)
{
DEBUG1("Killing %p", context);
context->iwannadie = 1;
-
+
DEBUG1("Scheduling %p", context);
__xbt_context_yield(context);
DEBUG1("End of Scheduling %p", context);
-
- return;
}
/* 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;}
