* It is strictly impossible to use a real semaphore, such as
* `sem_init <http://pubs.opengroup.org/onlinepubs/9699919799/functions/sem_init.html>`_,
* because it would block the whole simulation.
* It is strictly impossible to use a real semaphore, such as
* `sem_init <http://pubs.opengroup.org/onlinepubs/9699919799/functions/sem_init.html>`_,
* because it would block the whole simulation.