#OS #Semaphores Producer Consumer Problem Self Doubt.

Question

I know, that both P and C can go and fall into sleeping state in case of preemption and this can be solved via Semaphores.

 

Now, my doubt is that integer bit that will be set by the P and being sent to C and C will see the semaphore bit = 1 and won't go to sleep and whenever C finally goes to sleep will decrement the bit, but is it also the case that when P is sleeping then C can also send a semaphore bit = 1 for P and when Producer sees that bit = 1 and start producing and when buffer is full, P will decrement that bit and go to sleep?

Basically, both P and C can send this integer bit or only P can send this to C to wake him up?

 

Thank you!

Comments

no that cannot be a case, 1 means item produced and 0 means that item is consumed. Now producer always for producing an item and consumer consumes that. So, producer get an empty glass (i.e. 0) and then produce the item(makes it 1) and consumer consumes it and makes it 0

---

both P and C can send this integer bit

---

@ srestha  @ Shaik Masthan  Thank you, you lovely people! :)

---

@Srestha mam, in question they ask about semaphore value.... Not the buffer value...  The values in the buffer are our assumptions, i mean 0 for buffer slot is empty and 1 means slot full etc