int mutex_trylock(smx_mutex_t mutex);
void mutex_unlock(smx_mutex_t mutex);
-smx_cond_t cond_init() [[nohandler]];
void cond_wait(smx_cond_t cond, smx_mutex_t mutex) [[block]];
-void cond_wait_timeout(smx_cond_t cond, smx_mutex_t mutex, double timeout) [[block]];
+int cond_wait_timeout(smx_cond_t cond, smx_mutex_t mutex, double timeout) [[block]];
void sem_acquire(smx_sem_t sem) [[block]];
-void sem_acquire_timeout(smx_sem_t sem, double timeout) [[block]];
+int sem_acquire_timeout(smx_sem_t sem, double timeout) [[block]];
-sg_size_t storage_read(surf_storage_t st, sg_size_t size) [[block]];
-sg_size_t storage_write(surf_storage_t st, sg_size_t size) [[block]];
+sg_size_t io_wait(boost::intrusive_ptr<simgrid::kernel::activity::ActivityImpl> io) [[block]];
int mc_random(int min, int max);