I was hoping to change the value of a named semaphore in one instruction, like the inverse of sem_getvalue.
I have tried this and it worked:
(tough i have to do one sem_post() after that instruction so that the processes waiting on the semaphore realize it has been changed)Code:(*Sem).__align=x;
my question is: is this safe? Does that __align field has the same name in other systems?
the alternative is to do multiple sem_post(), but i want to avoid that...