Considering two processes P, and P;, there can be two cases: Case 1: P, and P, are not concurrently requesting. In this case, the process which requests first will get a REPLY message from the other process. Case 2: P, and P, are concurrently requesting. In this case, there can be two subcases:

Database System Concepts
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Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Considering two processes P, and P,, there can be two cases:
Case 1: P, and P, are not concurrently requesting. In this case, the process which requests
first will get a REPLY message from the other process.
Case 2: P, and P, are concurrently requesting. In this case, there can be two subcases:
1. P, is requesting with a higher priority than P,. In this case, P,'s REQUEST mes-
sage serves as an implicit REPLY message to P,'s request. Also, P, should wait
for REPLY/FLUSH message from some process to enter the CS.
2. P, is requesting with a lower priority than P,. In this case, P,'s REQUEST message
serves as an implicit REPLY message to P's request. Also, P, should wait for
REPLY/FLUSH message from some process to enter the CS.
write algorithm for given
data
Transcribed Image Text:Considering two processes P, and P,, there can be two cases: Case 1: P, and P, are not concurrently requesting. In this case, the process which requests first will get a REPLY message from the other process. Case 2: P, and P, are concurrently requesting. In this case, there can be two subcases: 1. P, is requesting with a higher priority than P,. In this case, P,'s REQUEST mes- sage serves as an implicit REPLY message to P,'s request. Also, P, should wait for REPLY/FLUSH message from some process to enter the CS. 2. P, is requesting with a lower priority than P,. In this case, P,'s REQUEST message serves as an implicit REPLY message to P's request. Also, P, should wait for REPLY/FLUSH message from some process to enter the CS. write algorithm for given data
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