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Option 4 : Brazil
- Brazil is the largest sugarcane producing country in the world followed by India, China and Thailand.
- Brazil produces around 768 million tonnes of sugarcane every year.
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Consider the following solution to the producer-consumer synchronization problem. The shared buffer size is . Three semaphores empty, full and mutex are defined with respective initial values of 0, and 1. Semaphore empty denotes the number of available slots in the buffer, for the consumer to read from. Semaphore denotes the number of available slots in the buffer, for the producer to write to. The placeholder variables, denoted by P, Q, R, and S, in the code below can be assigned either empty or full. The valid semaphore operations are: wait ( ) and signal ( ). Producer: Consumer: do {
wait (P) ;
wait (mutex) ;
//Add item to buffer
signal (mutex) ;
signal (Q) ;
} while (1) ; do {
wait (R) ;
wait (mutex) ;
//Consume item from buffer
signal (mutex) ;
signal (S) ;
} while (1) ;
Which one of the following assignments to P, Q, R and S will yield the correct solution?
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