MadeEasy 2022 OS question on concept of semaphores.
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My question is how progress condition is satisfied?

Suppose if process A is executing and after executing “Y = Y -1” CS happens process B tries to enter CS but as P is already down it will be in the waiting queue. Again CS happens and Signal (P) is executed again CS (now in process B)and now as P is UP process is trying to enter CS but as Q is down it will again enter the sleep mode. Isn’t this dis-satisfying the progress condition? A process wants to enter the CS but some other process (which is in the non-critical section) is stopping another process to enter into CS. Can anyone shed some light on this? Any help is appreciated. 

 

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