Question: 7. Use semaphore to solve the following synchronization problem among four processes P1, P2, P3, and P4. That is P1 can always proceed, P1 needs

7. Use semaphore to solve the following synchronization problem among four processes P1, P2, P3, and P4. That is P1 can always proceed, P1 needs the results from P1 to proceed. P3 needs the results from both P1 and P2 to proceed and P4 needs the results from both P2 and P3 to proceed. What do we need to put in each of the programs executed by each process?

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